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 * Font Awesome Free 6.5.2 by @fontawesome - https://fontawesome.com
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 * Datepicker for Bootstrap v1.10.0 (https://github.com/uxsolutions/bootstrap-datepicker)
 *
 * Licensed under the Apache License v2.0 (https://www.apache.org/licenses/LICENSE-2.0)
 */

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(min-width:768px){.lpx-mobile-menu{display:none}}.lpx-mobile-menu.hidden{display:none}.lpx-mobile-hamburger{width:72px;height:72px;border-radius:72px;background:var(--lpx-brand);top:-8px;position:relative}.lpx-mobile-hamburger:before{content:"";position:absolute;height:72px;background:var(--lpx-navbar-color);border-radius:50% 50% 50% 50%/80% 80% 20% 20%;left:50%;width:108px;margin-left:-54px;z-index:-1;top:-6px}.lpx-mobile-hamburger .hamburger-icon{width:60px;height:45px;position:relative;margin:14px auto;transform:scale(.56);transition:.5s ease-in-out;cursor:pointer;display:block}.lpx-mobile-hamburger .hamburger-icon .icon-part{display:block;position:absolute;height:7px;width:50%;background:#fff;opacity:1;transform:rotate(0deg);transition:.25s ease-in-out}.lpx-mobile-hamburger .hamburger-icon .icon-part:nth-child(even){left:50%;border-radius:0 var(--lpx-radius) var(--lpx-radius) 0}.lpx-mobile-hamburger .hamburger-icon .icon-part:nth-child(odd){left:0;border-radius:var(--lpx-radius) 0 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(max-width:767px){.lpx-settings{display:none}}.lpx-settings .setting-icon{cursor:pointer;height:36px;display:flex;align-items:center;justify-content:center}.lpx-settings .setting-icon i,.lpx-settings .setting-icon span{transition:color .25s ease}.lpx-settings .setting-icon:hover i,.lpx-settings .setting-icon:hover span,.lpx-settings .setting-icon:focus i,.lpx-settings .setting-icon:focus span{color:var(--lpx-brand)}.lpx-settings .lpx-context-menu{bottom:0;max-height:calc(100vh - 50px)}.lpx-sidebar .ps__rail-y{z-index:101}.lpx-toolbar-container{width:72px;background-color:var(--lpx-navbar-color);min-height:100vh;position:absolute;z-index:1021;top:0;right:0;bottom:0}.lpx-toolbar-container .lpx-toolbar{width:72px}.lpx-toolbar-container .lpx-settings{position:fixed;min-width:72px}.lpx-toolbar-container .lpx-context-menu{right:72px;margin:15px}.lpx-toolbar{color:var(--lpx-navbar-text-color);position:fixed;top:0;min-width:72px}.lpx-menu-item-link.active-menu-item .menu-item-badge{background:var(--lpx-brand);display:inline-block;width:18px;height:18px;color:#fff;border-radius:var(--lpx-radius);padding:0;line-height:18px;font-weight:bold;font-size:10px;position:absolute;top:0;right:10px;text-align:center}@media screen and (max-width:767px){.lpx-menu-item-link.active-menu-item .menu-item-badge{top:9px;right:32px}}.lpx-user-menu{margin:20px 0 0 0}.lpx-user-menu .lpx-menu-item-link{display:block;height:72px;color:var(--lpx-navbar-active-text-color)}.lpx-user-menu .lpx-menu-item-link .lpx-menu-item-text{text-align:center;font-size:.9em;line-height:2;width:72px!important;margin:0 -18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}.lpx-user-menu .lpx-menu-item-link .menu-item-icon{line-height:20px;height:20px;display:block;margin-top:-25px;margin-bottom:0;width:100%;font-size:24px}.lpx-user-menu .menu-item:hover .menu-item-icon,.lpx-toolbar .menu-item:hover .menu-item-icon{color:var(--lpx-navbar-active-text-color)}.lpx-user-ctx-header{display:flex}.lpx-user-ctx-img{margin-right:1em}.lpx-user-ctx-img .lpx-avatar-img{width:52px;height:52px}.lpx-user-ctx-info{display:flex;flex-direction:column;color:var(--lpx-navbar-text-color)}.outer-menu-item p.lpx-menu-item-desc{font-size:.875em;margin:0 0 12px;padding:0 60px;opacity:.875}.lpx-menu-filter{font-size:1em;margin:1px 16px 9px;padding:0 9px;position:relative;background:var(--lpx-navbar-active-bg-color);border-radius:var(--lpx-radius);border:1px solid rgba(var(--lpx-navbar-active-text-color-rgb),.05)}.lpx-menu-filter .menu-filter-icon{width:18px;line-height:32px;text-align:center;display:inline-block}.lpx-menu-filter .menu-filter-input{padding:0;opacity:1;color:var(--lpx-navbar-active-text-color);height:30px;width:170px;border-radius:var(--lpx-radius);transition:padding .2s ease;border:0;outline:0;background:var(--lpx-navbar-active-bg-color);padding-left:8px;position:absolute;top:0}.lpx-menu-filter .menu-filter-input::placeholder{color:var(--lpx-navbar-text-color)}.lpx-menu-filter .menu-filter-input:focus,.lpx-menu-filter .menu-filter-input:active{border:0;outline:0;background:var(--lpx-navbar-active-bg-color)}.lpx-menu-filter .menu-filter-clear{position:absolute;top:1px;right:9px;cursor:pointer;opacity:.65}.lpx-menu-filter .menu-filter-clear .clear-icon{font-size:20px}.lpx-menu-filter .menu-filter-clear.hidden{opacity:0}.hover-trigger .lpx-sidebar:not(:hover) .menu-filter-clear{opacity:0}@media only screen and (max-width:767px){.lpx-topbar{position:fixed;width:100%}}.lpx-context-menu-user-name{color:var(--lpx-navbar-active-text-color);margin-top:.275em;font-weight:bold;font-size:1.125em}.lpx-context-menu-user-email{font-size:.925em;opacity:.85}.confirmation .confirmation-backdrop{background:rgba(var(--lpx-content-text-rgb),.5)}.confirmation .confirmation-dialog{border:0;border-radius:var(--lpx-radius);background-color:var(--lpx-card-bg);box-shadow:var(--lpx-shadow)}.confirmation .confirmation-dialog .icon-container .icon{stroke:var(--lpx-primary);color:var(--lpx-primary)}.confirmation .confirmation-dialog .icon-container.info .icon{stroke:var(--lpx-info);color:var(--lpx-info)}.confirmation .confirmation-dialog .icon-container.success .icon{stroke:var(--lpx-success);color:var(--lpx-success)}.confirmation .confirmation-dialog .icon-container.warning .icon{stroke:var(--lpx-warning);color:var(--lpx-warning)}.confirmation .confirmation-dialog .icon-container.error .icon{stroke:var(--lpx-danger);color:var(--lpx-danger)}.confirmation .confirmation-dialog .content .title,.confirmation .confirmation-dialog .content .message{color:var(--lpx-content-text)}.confirmation .confirmation-dialog .footer{border-radius:0 0 var(--lpx-radius) var(--lpx-radius)}.confirmation .confirmation-dialog .footer .confirmation-button{background-color:var(--lpx-primary);color:#fff;border-radius:var(--lpx-radius)}.confirmation .confirmation-dialog .footer .confirmation-button:hover,.confirmation .confirmation-dialog .footer .confirmation-button:focus,.confirmation .confirmation-dialog .footer .confirmation-button:active{background-color:rgba(var(--lpx-primary-rgb),.5)}.content-header-title{color:var(--lpx-card-title-text-color);font-size:1.5em!important;font-weight:600;margin-bottom:1em;margin-top:.3333333333em}#toast-container.toast-top-full-width,#toast-container.toast-top-center{background:linear-gradient(to bottom,rgba(0,0,0,.1) 0%,rgba(0,0,0,0) 100%);padding:20px 15px 100px}#toast-container.toast-bottom-full-width,#toast-container.toast-bottom-center{background:linear-gradient(to top,rgba(0,0,0,.1) 0%,rgba(0,0,0,0) 100%);padding:100px 15px 20px 15px}#toast-container.toast-top-right{top:8px;right:8px}#toast-container.toast-top-left{top:8px;left:8px}#toast-container.toast-bottom-left{bottom:8px;left:8px}#toast-container.toast-bottom-right{bottom:8px;right:8px}#toast-container>div{opacity:.975}#toast-container button.toast-close-button{color:#000}.dataTables_wrapper,.tab-content{border-radius:var(--lpx-radius);background:var(--lpx-card-bg);box-shadow:var(--lpx-shadow);padding:1.5rem}.nav-tabs{background:var(--lpx-card-bg);box-shadow:var(--lpx-shadow);padding:0 1.5rem;border-radius:var(--lpx-radius);margin-bottom:1rem}.card .nav-tabs{background:none;box-shadow:none;padding:0;border-radius:none}.card .tab-content{background:none;box-shadow:none;padding-left:0;padding-right:0}.tab-content .card{background:none;box-shadow:none;padding:0}.modal-body .tab-content{background:none;box-shadow:none}.modal-body .nav-tabs,.card .nav-tabs,.tab-content .nav-tabs{background:none;box-shadow:none;padding-left:0;padding-right:0}hr{opacity:.1}.abp-block-area{background:var(--lpx-card-bg)}.abp-md-form{max-width:540px}.toastui-editor-main{background-color:#fff}@import url("https://rsms.me/inter/inter.css");:root .lpx-theme-dim,:root .lpx-theme-dark{--lpx-logo:url('/images/logo/leptonx/icon.svg');--lpx-logo-icon:url('/images/logo/leptonx/icon.svg')}:root .lpx-theme-light{--lpx-logo:url('/images/logo/leptonx/icon.svg');--lpx-logo-icon:url('/images/logo/leptonx/icon.svg')}:root{--lpx-theme-light-bg:url('/LeptonX/images/login-pages/login-bg-img-light.svg');--lpx-theme-dim-bg:url('/LeptonX/images/login-pages/login-bg-img-dim.svg');--lpx-theme-dark-bg:url('/LeptonX/images/login-pages/login-bg-img-dark.svg')}.account-module-form button[name="provider"]{width:100%;height:43px}.account-module-form button[name="provider"] i{font-size:1.5rem}.account-module-form button[name="provider"] span{margin-left:10px;font-size:1.2rem;vertical-align:bottom}.lpx-login-bg .card-body hr,.lpx-login-bg .card-body div.row:first-child{display:none!important}.CodeMirror{font-family:monospace;height:300px;color:#000;direction:ltr}.CodeMirror-lines{padding:4px 0}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{padding:0 4px}.CodeMirror-scrollbar-filler,.CodeMirror-gutter-filler{background-color:#fff}.CodeMirror-gutters{border-right:1px solid #ddd;background-color:#f7f7f7;white-space:nowrap}.CodeMirror-linenumber{padding:0 3px 0 5px;min-width:20px;text-align:right;color:#999;white-space:nowrap}.CodeMirror-guttermarker{color:#000}.CodeMirror-guttermarker-subtle{color:#999}.CodeMirror-cursor{border-left:1px solid #000;border-right:0;width:0}.CodeMirror div.CodeMirror-secondarycursor{border-left:1px solid #c0c0c0}.cm-fat-cursor .CodeMirror-cursor{width:auto;border:0!important;background:#7e7}.cm-fat-cursor div.CodeMirror-cursors{z-index:1}.cm-fat-cursor .CodeMirror-line::selection,.cm-fat-cursor .CodeMirror-line>span::selection,.cm-fat-cursor .CodeMirror-line>span>span::selection{background:transparent}.cm-fat-cursor .CodeMirror-line::-moz-selection,.cm-fat-cursor .CodeMirror-line>span::-moz-selection,.cm-fat-cursor .CodeMirror-line>span>span::-moz-selection{background:transparent}.cm-fat-cursor{caret-color:transparent}@-moz-keyframes blink{0%{}50%{background-color:transparent}100%{}}@-webkit-keyframes blink{0%{}50%{background-color:transparent}100%{}}@keyframes blink{0%{}50%{background-color:transparent}100%{}}.cm-tab{display:inline-block;text-decoration:inherit}.CodeMirror-rulers{position:absolute;left:0;right:0;top:-50px;bottom:0;overflow:hidden}.CodeMirror-ruler{border-left:1px solid #ccc;top:0;bottom:0;position:absolute}.cm-s-default .cm-header{color:#00f}.cm-s-default .cm-quote{color:#090}.cm-negative{color:#d44}.cm-positive{color:#292}.cm-header,.cm-strong{font-weight:bold}.cm-em{font-style:italic}.cm-link{text-decoration:underline}.cm-strikethrough{text-decoration:line-through}.cm-s-default .cm-keyword{color:#708}.cm-s-default .cm-atom{color:#219}.cm-s-default .cm-number{color:#164}.cm-s-default .cm-def{color:#00f}.cm-s-default .cm-variable-2{color:#05a}.cm-s-default .cm-variable-3,.cm-s-default .cm-type{color:#085}.cm-s-default .cm-comment{color:#a50}.cm-s-default .cm-string{color:#a11}.cm-s-default .cm-string-2{color:#f50}.cm-s-default .cm-meta{color:#555}.cm-s-default .cm-qualifier{color:#555}.cm-s-default .cm-builtin{color:#30a}.cm-s-default .cm-bracket{color:#997}.cm-s-default .cm-tag{color:#170}.cm-s-default .cm-attribute{color:#00c}.cm-s-default .cm-hr{color:#999}.cm-s-default .cm-link{color:#00c}.cm-s-default .cm-error{color:#f00}.cm-invalidchar{color:#f00}.CodeMirror-composing{border-bottom:2px solid}div.CodeMirror span.CodeMirror-matchingbracket{color:#0b0}div.CodeMirror span.CodeMirror-nonmatchingbracket{color:#a22}.CodeMirror-matchingtag{background:rgba(255,150,0,.3)}.CodeMirror-activeline-background{background:#e8f2ff}.CodeMirror{position:relative;overflow:hidden;background:#fff}.CodeMirror-scroll{overflow:scroll!important;margin-bottom:-50px;margin-right:-50px;padding-bottom:50px;height:100%;outline:0;position:relative;z-index:0}.CodeMirror-sizer{position:relative;border-right:50px solid transparent}.CodeMirror-vscrollbar,.CodeMirror-hscrollbar,.CodeMirror-scrollbar-filler,.CodeMirror-gutter-filler{position:absolute;z-index:6;display:none;outline:0}.CodeMirror-vscrollbar{right:0;top:0;overflow-x:hidden;overflow-y:scroll}.CodeMirror-hscrollbar{bottom:0;left:0;overflow-y:hidden;overflow-x:scroll}.CodeMirror-scrollbar-filler{right:0;bottom:0}.CodeMirror-gutter-filler{left:0;bottom:0}.CodeMirror-gutters{position:absolute;left:0;top:0;min-height:100%;z-index:3}.CodeMirror-gutter{white-space:normal;height:100%;display:inline-block;vertical-align:top;margin-bottom:-50px}.CodeMirror-gutter-wrapper{position:absolute;z-index:4;background:none!important;border:0!important}.CodeMirror-gutter-background{position:absolute;top:0;bottom:0;z-index:4}.CodeMirror-gutter-elt{position:absolute;cursor:default;z-index:4}.CodeMirror-gutter-wrapper ::selection{background-color:transparent}.CodeMirror-gutter-wrapper ::-moz-selection{background-color:transparent}.CodeMirror-lines{cursor:text;min-height:1px}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{-moz-border-radius:0;-webkit-border-radius:0;border-radius:0;border-width:0;background:transparent;font-family:inherit;font-size:inherit;margin:0;white-space:pre;word-wrap:normal;line-height:inherit;color:inherit;z-index:2;position:relative;overflow:visible;-webkit-tap-highlight-color:transparent;-webkit-font-variant-ligatures:contextual;font-variant-ligatures:contextual}.CodeMirror-wrap pre.CodeMirror-line,.CodeMirror-wrap pre.CodeMirror-line-like{word-wrap:break-word;white-space:pre-wrap;word-break:normal}.CodeMirror-linebackground{position:absolute;left:0;right:0;top:0;bottom:0;z-index:0}.CodeMirror-linewidget{position:relative;z-index:2;padding:.1px}.CodeMirror-rtl pre{direction:rtl}.CodeMirror-code{outline:0}.CodeMirror-scroll,.CodeMirror-sizer,.CodeMirror-gutter,.CodeMirror-gutters,.CodeMirror-linenumber{-moz-box-sizing:content-box;box-sizing:content-box}.CodeMirror-measure{position:absolute;width:100%;height:0;overflow:hidden;visibility:hidden}.CodeMirror-cursor{position:absolute;pointer-events:none}.CodeMirror-measure pre{position:static}div.CodeMirror-cursors{visibility:hidden;position:relative;z-index:3}div.CodeMirror-dragcursors{visibility:visible}.CodeMirror-focused div.CodeMirror-cursors{visibility:visible}.CodeMirror-selected{background:#d9d9d9}.CodeMirror-focused .CodeMirror-selected{background:#d7d4f0}.CodeMirror-crosshair{cursor:crosshair}.CodeMirror-line::selection,.CodeMirror-line>span::selection,.CodeMirror-line>span>span::selection{background:#d7d4f0}.CodeMirror-line::-moz-selection,.CodeMirror-line>span::-moz-selection,.CodeMirror-line>span>span::-moz-selection{background:#d7d4f0}.cm-searching{background-color:#ffa;background-color:rgba(255,255,0,.4)}.cm-force-border{padding-right:.1px}@media print{.CodeMirror div.CodeMirror-cursors{visibility:hidden}}.cm-tab-wrap-hack:after{content:''}span.CodeMirror-selectedtext{background:none}// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/LICENSE

// This is CodeMirror (https://codemirror.net/5), a code editor
// implemented in JavaScript on top of the browser's DOM.
//
// You can find some technical background for some of the code below
// at http://marijnhaverbeke.nl/blog/#cm-internals .

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (global = global || self, global.CodeMirror = factory());
}(this, (function () {
    'use strict';

    // Kludges for bugs and behavior differences that can't be feature
    // detected are enabled based on userAgent etc sniffing.
    var userAgent = navigator.userAgent;
    var platform = navigator.platform;

    var gecko = /gecko\/\d/i.test(userAgent);
    var ie_upto10 = /MSIE \d/.test(userAgent);
    var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
    var edge = /Edge\/(\d+)/.exec(userAgent);
    var ie = ie_upto10 || ie_11up || edge;
    var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
    var webkit = !edge && /WebKit\//.test(userAgent);
    var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
    var chrome = !edge && /Chrome\/(\d+)/.exec(userAgent);
    var chrome_version = chrome && +chrome[1];
    var presto = /Opera\//.test(userAgent);
    var safari = /Apple Computer/.test(navigator.vendor);
    var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
    var phantom = /PhantomJS/.test(userAgent);

    var ios = safari && (/Mobile\/\w+/.test(userAgent) || navigator.maxTouchPoints > 2);
    var android = /Android/.test(userAgent);
    // This is woefully incomplete. Suggestions for alternative methods welcome.
    var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
    var mac = ios || /Mac/.test(platform);
    var chromeOS = /\bCrOS\b/.test(userAgent);
    var windows = /win/i.test(platform);

    var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
    if (presto_version) { presto_version = Number(presto_version[1]); }
    if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
    // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
    var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
    var captureRightClick = gecko || (ie && ie_version >= 9);

    function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }

    var rmClass = function (node, cls) {
        var current = node.className;
        var match = classTest(cls).exec(current);
        if (match) {
            var after = current.slice(match.index + match[0].length);
            node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
        }
    };

    function removeChildren(e) {
        for (var count = e.childNodes.length; count > 0; --count) { e.removeChild(e.firstChild); }
        return e
    }

    function removeChildrenAndAdd(parent, e) {
        return removeChildren(parent).appendChild(e)
    }

    function elt(tag, content, className, style) {
        var e = document.createElement(tag);
        if (className) { e.className = className; }
        if (style) { e.style.cssText = style; }
        if (typeof content == "string") { e.appendChild(document.createTextNode(content)); }
        else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }
        return e
    }
    // wrapper for elt, which removes the elt from the accessibility tree
    function eltP(tag, content, className, style) {
        var e = elt(tag, content, className, style);
        e.setAttribute("role", "presentation");
        return e
    }

    var range;
    if (document.createRange) {
        range = function (node, start, end, endNode) {
            var r = document.createRange();
            r.setEnd(endNode || node, end);
            r.setStart(node, start);
            return r
        };
    }
    else {
        range = function (node, start, end) {
            var r = document.body.createTextRange();
            try { r.moveToElementText(node.parentNode); }
            catch (e) { return r }
            r.collapse(true);
            r.moveEnd("character", end);
            r.moveStart("character", start);
            return r
        };
    }

    function contains(parent, child) {
        if (child.nodeType == 3) // Android browser always returns false when child is a textnode
        { child = child.parentNode; }
        if (parent.contains) { return parent.contains(child) }
        do {
            if (child.nodeType == 11) { child = child.host; }
            if (child == parent) { return true }
        } while (child = child.parentNode)
    }

    function activeElt(doc) {
        // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
        // IE < 10 will throw when accessed while the page is loading or in an iframe.
        // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
        var activeElement;
        try {
            activeElement = doc.activeElement;
        } catch (e) {
            activeElement = doc.body || null;
        }
        while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement) { activeElement = activeElement.shadowRoot.activeElement; }
        return activeElement
    }

    function addClass(node, cls) {
        var current = node.className;
        if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls; }
    }
    function joinClasses(a, b) {
        var as = a.split(" ");
        for (var i = 0; i < as.length; i++) { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i]; } }
        return b
    }

    var selectInput = function (node) { node.select(); };
    if (ios) // Mobile Safari apparently has a bug where select() is broken.
    { selectInput = function (node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }
    else if (ie) // Suppress mysterious IE10 errors
    { selectInput = function (node) { try { node.select(); } catch (_e) { } }; }

    function doc(cm) { return cm.display.wrapper.ownerDocument }

    function win(cm) { return doc(cm).defaultView }

    function bind(f) {
        var args = Array.prototype.slice.call(arguments, 1);
        return function () { return f.apply(null, args) }
    }

    function copyObj(obj, target, overwrite) {
        if (!target) { target = {}; }
        for (var prop in obj) {
            if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop))) { target[prop] = obj[prop]; }
        }
        return target
    }

    // Counts the column offset in a string, taking tabs into account.
    // Used mostly to find indentation.
    function countColumn(string, end, tabSize, startIndex, startValue) {
        if (end == null) {
            end = string.search(/[^\s\u00a0]/);
            if (end == -1) { end = string.length; }
        }
        for (var i = startIndex || 0, n = startValue || 0; ;) {
            var nextTab = string.indexOf("\t", i);
            if (nextTab < 0 || nextTab >= end) { return n + (end - i) }
            n += nextTab - i;
            n += tabSize - (n % tabSize);
            i = nextTab + 1;
        }
    }

    var Delayed = function () {
        this.id = null;
        this.f = null;
        this.time = 0;
        this.handler = bind(this.onTimeout, this);
    };
    Delayed.prototype.onTimeout = function (self) {
        self.id = 0;
        if (self.time <= +new Date) {
            self.f();
        } else {
            setTimeout(self.handler, self.time - +new Date);
        }
    };
    Delayed.prototype.set = function (ms, f) {
        this.f = f;
        var time = +new Date + ms;
        if (!this.id || time < this.time) {
            clearTimeout(this.id);
            this.id = setTimeout(this.handler, ms);
            this.time = time;
        }
    };

    function indexOf(array, elt) {
        for (var i = 0; i < array.length; ++i) { if (array[i] == elt) { return i } }
        return -1
    }

    // Number of pixels added to scroller and sizer to hide scrollbar
    var scrollerGap = 50;

    // Returned or thrown by various protocols to signal 'I'm not
    // handling this'.
    var Pass = { toString: function () { return "CodeMirror.Pass" } };

    // Reused option objects for setSelection & friends
    var sel_dontScroll = { scroll: false }, sel_mouse = { origin: "*mouse" }, sel_move = { origin: "+move" };

    // The inverse of countColumn -- find the offset that corresponds to
    // a particular column.
    function findColumn(string, goal, tabSize) {
        for (var pos = 0, col = 0; ;) {
            var nextTab = string.indexOf("\t", pos);
            if (nextTab == -1) { nextTab = string.length; }
            var skipped = nextTab - pos;
            if (nextTab == string.length || col + skipped >= goal) { return pos + Math.min(skipped, goal - col) }
            col += nextTab - pos;
            col += tabSize - (col % tabSize);
            pos = nextTab + 1;
            if (col >= goal) { return pos }
        }
    }

    var spaceStrs = [""];
    function spaceStr(n) {
        while (spaceStrs.length <= n) { spaceStrs.push(lst(spaceStrs) + " "); }
        return spaceStrs[n]
    }

    function lst(arr) { return arr[arr.length - 1] }

    function map(array, f) {
        var out = [];
        for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }
        return out
    }

    function insertSorted(array, value, score) {
        var pos = 0, priority = score(value);
        while (pos < array.length && score(array[pos]) <= priority) { pos++; }
        array.splice(pos, 0, value);
    }

    function nothing() { }

    function createObj(base, props) {
        var inst;
        if (Object.create) {
            inst = Object.create(base);
        } else {
            nothing.prototype = base;
            inst = new nothing();
        }
        if (props) { copyObj(props, inst); }
        return inst
    }

    var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
    function isWordCharBasic(ch) {
        return /\w/.test(ch) || ch > "\x80" &&
            (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
    }
    function isWordChar(ch, helper) {
        if (!helper) { return isWordCharBasic(ch) }
        if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
        return helper.test(ch)
    }

    function isEmpty(obj) {
        for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
        return true
    }

    // Extending unicode characters. A series of a non-extending char +
    // any number of extending chars is treated as a single unit as far
    // as editing and measuring is concerned. This is not fully correct,
    // since some scripts/fonts/browsers also treat other configurations
    // of code points as a group.
    var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
    function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }

    // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
    function skipExtendingChars(str, pos, dir) {
        while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }
        return pos
    }

    // Returns the value from the range [`from`; `to`] that satisfies
    // `pred` and is closest to `from`. Assumes that at least `to`
    // satisfies `pred`. Supports `from` being greater than `to`.
    function findFirst(pred, from, to) {
        // At any point we are certain `to` satisfies `pred`, don't know
        // whether `from` does.
        var dir = from > to ? -1 : 1;
        for (; ;) {
            if (from == to) { return from }
            var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
            if (mid == from) { return pred(mid) ? from : to }
            if (pred(mid)) { to = mid; }
            else { from = mid + dir; }
        }
    }

    // BIDI HELPERS

    function iterateBidiSections(order, from, to, f) {
        if (!order) { return f(from, to, "ltr", 0) }
        var found = false;
        for (var i = 0; i < order.length; ++i) {
            var part = order[i];
            if (part.from < to && part.to > from || from == to && part.to == from) {
                f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
                found = true;
            }
        }
        if (!found) { f(from, to, "ltr"); }
    }

    var bidiOther = null;
    function getBidiPartAt(order, ch, sticky) {
        var found;
        bidiOther = null;
        for (var i = 0; i < order.length; ++i) {
            var cur = order[i];
            if (cur.from < ch && cur.to > ch) { return i }
            if (cur.to == ch) {
                if (cur.from != cur.to && sticky == "before") { found = i; }
                else { bidiOther = i; }
            }
            if (cur.from == ch) {
                if (cur.from != cur.to && sticky != "before") { found = i; }
                else { bidiOther = i; }
            }
        }
        return found != null ? found : bidiOther
    }

    // Bidirectional ordering algorithm
    // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
    // that this (partially) implements.

    // One-char codes used for character types:
    // L (L):   Left-to-Right
    // R (R):   Right-to-Left
    // r (AL):  Right-to-Left Arabic
    // 1 (EN):  European Number
    // + (ES):  European Number Separator
    // % (ET):  European Number Terminator
    // n (AN):  Arabic Number
    // , (CS):  Common Number Separator
    // m (NSM): Non-Spacing Mark
    // b (BN):  Boundary Neutral
    // s (B):   Paragraph Separator
    // t (S):   Segment Separator
    // w (WS):  Whitespace
    // N (ON):  Other Neutrals

    // Returns null if characters are ordered as they appear
    // (left-to-right), or an array of sections ({from, to, level}
    // objects) in the order in which they occur visually.
    var bidiOrdering = (function () {
        // Character types for codepoints 0 to 0xff
        var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
        // Character types for codepoints 0x600 to 0x6f9
        var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";
        function charType(code) {
            if (code <= 0xf7) { return lowTypes.charAt(code) }
            else if (0x590 <= code && code <= 0x5f4) { return "R" }
            else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
            else if (0x6ee <= code && code <= 0x8ac) { return "r" }
            else if (0x2000 <= code && code <= 0x200b) { return "w" }
            else if (code == 0x200c) { return "b" }
            else { return "L" }
        }

        var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
        var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;

        function BidiSpan(level, from, to) {
            this.level = level;
            this.from = from; this.to = to;
        }

        return function (str, direction) {
            var outerType = direction == "ltr" ? "L" : "R";

            if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
            var len = str.length, types = [];
            for (var i = 0; i < len; ++i) { types.push(charType(str.charCodeAt(i))); }

            // W1. Examine each non-spacing mark (NSM) in the level run, and
            // change the type of the NSM to the type of the previous
            // character. If the NSM is at the start of the level run, it will
            // get the type of sor.
            for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
                var type = types[i$1];
                if (type == "m") { types[i$1] = prev; }
                else { prev = type; }
            }

            // W2. Search backwards from each instance of a European number
            // until the first strong type (R, L, AL, or sor) is found. If an
            // AL is found, change the type of the European number to Arabic
            // number.
            // W3. Change all ALs to R.
            for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
                var type$1 = types[i$2];
                if (type$1 == "1" && cur == "r") { types[i$2] = "n"; }
                else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R"; } }
            }

            // W4. A single European separator between two European numbers
            // changes to a European number. A single common separator between
            // two numbers of the same type changes to that type.
            for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
                var type$2 = types[i$3];
                if (type$2 == "+" && prev$1 == "1" && types[i$3 + 1] == "1") { types[i$3] = "1"; }
                else if (type$2 == "," && prev$1 == types[i$3 + 1] &&
                    (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1; }
                prev$1 = type$2;
            }

            // W5. A sequence of European terminators adjacent to European
            // numbers changes to all European numbers.
            // W6. Otherwise, separators and terminators change to Other
            // Neutral.
            for (var i$4 = 0; i$4 < len; ++i$4) {
                var type$3 = types[i$4];
                if (type$3 == ",") { types[i$4] = "N"; }
                else if (type$3 == "%") {
                    var end = (void 0);
                    for (end = i$4 + 1; end < len && types[end] == "%"; ++end) { }
                    var replace = (i$4 && types[i$4 - 1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
                    for (var j = i$4; j < end; ++j) { types[j] = replace; }
                    i$4 = end - 1;
                }
            }

            // W7. Search backwards from each instance of a European number
            // until the first strong type (R, L, or sor) is found. If an L is
            // found, then change the type of the European number to L.
            for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
                var type$4 = types[i$5];
                if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L"; }
                else if (isStrong.test(type$4)) { cur$1 = type$4; }
            }

            // N1. A sequence of neutrals takes the direction of the
            // surrounding strong text if the text on both sides has the same
            // direction. European and Arabic numbers act as if they were R in
            // terms of their influence on neutrals. Start-of-level-run (sor)
            // and end-of-level-run (eor) are used at level run boundaries.
            // N2. Any remaining neutrals take the embedding direction.
            for (var i$6 = 0; i$6 < len; ++i$6) {
                if (isNeutral.test(types[i$6])) {
                    var end$1 = (void 0);
                    for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) { }
                    var before = (i$6 ? types[i$6 - 1] : outerType) == "L";
                    var after = (end$1 < len ? types[end$1] : outerType) == "L";
                    var replace$1 = before == after ? (before ? "L" : "R") : outerType;
                    for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }
                    i$6 = end$1 - 1;
                }
            }

            // Here we depart from the documented algorithm, in order to avoid
            // building up an actual levels array. Since there are only three
            // levels (0, 1, 2) in an implementation that doesn't take
            // explicit embedding into account, we can build up the order on
            // the fly, without following the level-based algorithm.
            var order = [], m;
            for (var i$7 = 0; i$7 < len;) {
                if (countsAsLeft.test(types[i$7])) {
                    var start = i$7;
                    for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) { }
                    order.push(new BidiSpan(0, start, i$7));
                } else {
                    var pos = i$7, at = order.length, isRTL = direction == "rtl" ? 1 : 0;
                    for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) { }
                    for (var j$2 = pos; j$2 < i$7;) {
                        if (countsAsNum.test(types[j$2])) {
                            if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); at += isRTL; }
                            var nstart = j$2;
                            for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) { }
                            order.splice(at, 0, new BidiSpan(2, nstart, j$2));
                            at += isRTL;
                            pos = j$2;
                        } else { ++j$2; }
                    }
                    if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }
                }
            }
            if (direction == "ltr") {
                if (order[0].level == 1 && (m = str.match(/^\s+/))) {
                    order[0].from = m[0].length;
                    order.unshift(new BidiSpan(0, 0, m[0].length));
                }
                if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
                    lst(order).to -= m[0].length;
                    order.push(new BidiSpan(0, len - m[0].length, len));
                }
            }

            return direction == "rtl" ? order.reverse() : order
        }
    })();

    // Get the bidi ordering for the given line (and cache it). Returns
    // false for lines that are fully left-to-right, and an array of
    // BidiSpan objects otherwise.
    function getOrder(line, direction) {
        var order = line.order;
        if (order == null) { order = line.order = bidiOrdering(line.text, direction); }
        return order
    }

    // EVENT HANDLING

    // Lightweight event framework. on/off also work on DOM nodes,
    // registering native DOM handlers.

    var noHandlers = [];

    var on = function (emitter, type, f) {
        if (emitter.addEventListener) {
            emitter.addEventListener(type, f, false);
        } else if (emitter.attachEvent) {
            emitter.attachEvent("on" + type, f);
        } else {
            var map = emitter._handlers || (emitter._handlers = {});
            map[type] = (map[type] || noHandlers).concat(f);
        }
    };

    function getHandlers(emitter, type) {
        return emitter._handlers && emitter._handlers[type] || noHandlers
    }

    function off(emitter, type, f) {
        if (emitter.removeEventListener) {
            emitter.removeEventListener(type, f, false);
        } else if (emitter.detachEvent) {
            emitter.detachEvent("on" + type, f);
        } else {
            var map = emitter._handlers, arr = map && map[type];
            if (arr) {
                var index = indexOf(arr, f);
                if (index > -1) { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }
            }
        }
    }

    function signal(emitter, type /*, values...*/) {
        var handlers = getHandlers(emitter, type);
        if (!handlers.length) { return }
        var args = Array.prototype.slice.call(arguments, 2);
        for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }
    }

    // The DOM events that CodeMirror handles can be overridden by
    // registering a (non-DOM) handler on the editor for the event name,
    // and preventDefault-ing the event in that handler.
    function signalDOMEvent(cm, e, override) {
        if (typeof e == "string") { e = { type: e, preventDefault: function () { this.defaultPrevented = true; } }; }
        signal(cm, override || e.type, cm, e);
        return e_defaultPrevented(e) || e.codemirrorIgnore
    }

    function signalCursorActivity(cm) {
        var arr = cm._handlers && cm._handlers.cursorActivity;
        if (!arr) { return }
        var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
        for (var i = 0; i < arr.length; ++i) {
            if (indexOf(set, arr[i]) == -1) { set.push(arr[i]); }
        }
    }

    function hasHandler(emitter, type) {
        return getHandlers(emitter, type).length > 0
    }

    // Add on and off methods to a constructor's prototype, to make
    // registering events on such objects more convenient.
    function eventMixin(ctor) {
        ctor.prototype.on = function (type, f) { on(this, type, f); };
        ctor.prototype.off = function (type, f) { off(this, type, f); };
    }

    // Due to the fact that we still support jurassic IE versions, some
    // compatibility wrappers are needed.

    function e_preventDefault(e) {
        if (e.preventDefault) { e.preventDefault(); }
        else { e.returnValue = false; }
    }
    function e_stopPropagation(e) {
        if (e.stopPropagation) { e.stopPropagation(); }
        else { e.cancelBubble = true; }
    }
    function e_defaultPrevented(e) {
        return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
    }
    function e_stop(e) { e_preventDefault(e); e_stopPropagation(e); }

    function e_target(e) { return e.target || e.srcElement }
    function e_button(e) {
        var b = e.which;
        if (b == null) {
            if (e.button & 1) { b = 1; }
            else if (e.button & 2) { b = 3; }
            else if (e.button & 4) { b = 2; }
        }
        if (mac && e.ctrlKey && b == 1) { b = 3; }
        return b
    }

    // Detect drag-and-drop
    var dragAndDrop = function () {
        // There is *some* kind of drag-and-drop support in IE6-8, but I
        // couldn't get it to work yet.
        if (ie && ie_version < 9) { return false }
        var div = elt('div');
        return "draggable" in div || "dragDrop" in div
    }();

    var zwspSupported;
    function zeroWidthElement(measure) {
        if (zwspSupported == null) {
            var test = elt("span", "\u200b");
            removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
            if (measure.firstChild.offsetHeight != 0) { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }
        }
        var node = zwspSupported ? elt("span", "\u200b") :
            elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
        node.setAttribute("cm-text", "");
        return node
    }

    // Feature-detect IE's crummy client rect reporting for bidi text
    var badBidiRects;
    function hasBadBidiRects(measure) {
        if (badBidiRects != null) { return badBidiRects }
        var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
        var r0 = range(txt, 0, 1).getBoundingClientRect();
        var r1 = range(txt, 1, 2).getBoundingClientRect();
        removeChildren(measure);
        if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
        return badBidiRects = (r1.right - r0.right < 3)
    }

    // See if "".split is the broken IE version, if so, provide an
    // alternative way to split lines.
    var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
        var pos = 0, result = [], l = string.length;
        while (pos <= l) {
            var nl = string.indexOf("\n", pos);
            if (nl == -1) { nl = string.length; }
            var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
            var rt = line.indexOf("\r");
            if (rt != -1) {
                result.push(line.slice(0, rt));
                pos += rt + 1;
            } else {
                result.push(line);
                pos = nl + 1;
            }
        }
        return result
    } : function (string) { return string.split(/\r\n?|\n/); };

    var hasSelection = window.getSelection ? function (te) {
        try { return te.selectionStart != te.selectionEnd }
        catch (e) { return false }
    } : function (te) {
        var range;
        try { range = te.ownerDocument.selection.createRange(); }
        catch (e) { }
        if (!range || range.parentElement() != te) { return false }
        return range.compareEndPoints("StartToEnd", range) != 0
    };

    var hasCopyEvent = (function () {
        var e = elt("div");
        if ("oncopy" in e) { return true }
        e.setAttribute("oncopy", "return;");
        return typeof e.oncopy == "function"
    })();

    var badZoomedRects = null;
    function hasBadZoomedRects(measure) {
        if (badZoomedRects != null) { return badZoomedRects }
        var node = removeChildrenAndAdd(measure, elt("span", "x"));
        var normal = node.getBoundingClientRect();
        var fromRange = range(node, 0, 1).getBoundingClientRect();
        return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
    }

    // Known modes, by name and by MIME
    var modes = {}, mimeModes = {};

    // Extra arguments are stored as the mode's dependencies, which is
    // used by (legacy) mechanisms like loadmode.js to automatically
    // load a mode. (Preferred mechanism is the require/define calls.)
    function defineMode(name, mode) {
        if (arguments.length > 2) { mode.dependencies = Array.prototype.slice.call(arguments, 2); }
        modes[name] = mode;
    }

    function defineMIME(mime, spec) {
        mimeModes[mime] = spec;
    }

    // Given a MIME type, a {name, ...options} config object, or a name
    // string, return a mode config object.
    function resolveMode(spec) {
        if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
            spec = mimeModes[spec];
        } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
            var found = mimeModes[spec.name];
            if (typeof found == "string") { found = { name: found }; }
            spec = createObj(found, spec);
            spec.name = found.name;
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
            return resolveMode("application/xml")
        } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
            return resolveMode("application/json")
        }
        if (typeof spec == "string") { return { name: spec } }
        else { return spec || { name: "null" } }
    }

    // Given a mode spec (anything that resolveMode accepts), find and
    // initialize an actual mode object.
    function getMode(options, spec) {
        spec = resolveMode(spec);
        var mfactory = modes[spec.name];
        if (!mfactory) { return getMode(options, "text/plain") }
        var modeObj = mfactory(options, spec);
        if (modeExtensions.hasOwnProperty(spec.name)) {
            var exts = modeExtensions[spec.name];
            for (var prop in exts) {
                if (!exts.hasOwnProperty(prop)) { continue }
                if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop]; }
                modeObj[prop] = exts[prop];
            }
        }
        modeObj.name = spec.name;
        if (spec.helperType) { modeObj.helperType = spec.helperType; }
        if (spec.modeProps) {
            for (var prop$1 in spec.modeProps) { modeObj[prop$1] = spec.modeProps[prop$1]; }
        }

        return modeObj
    }

    // This can be used to attach properties to mode objects from
    // outside the actual mode definition.
    var modeExtensions = {};
    function extendMode(mode, properties) {
        var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
        copyObj(properties, exts);
    }

    function copyState(mode, state) {
        if (state === true) { return state }
        if (mode.copyState) { return mode.copyState(state) }
        var nstate = {};
        for (var n in state) {
            var val = state[n];
            if (val instanceof Array) { val = val.concat([]); }
            nstate[n] = val;
        }
        return nstate
    }

    // Given a mode and a state (for that mode), find the inner mode and
    // state at the position that the state refers to.
    function innerMode(mode, state) {
        var info;
        while (mode.innerMode) {
            info = mode.innerMode(state);
            if (!info || info.mode == mode) { break }
            state = info.state;
            mode = info.mode;
        }
        return info || { mode: mode, state: state }
    }

    function startState(mode, a1, a2) {
        return mode.startState ? mode.startState(a1, a2) : true
    }

    // STRING STREAM

    // Fed to the mode parsers, provides helper functions to make
    // parsers more succinct.

    var StringStream = function (string, tabSize, lineOracle) {
        this.pos = this.start = 0;
        this.string = string;
        this.tabSize = tabSize || 8;
        this.lastColumnPos = this.lastColumnValue = 0;
        this.lineStart = 0;
        this.lineOracle = lineOracle;
    };

    StringStream.prototype.eol = function () { return this.pos >= this.string.length };
    StringStream.prototype.sol = function () { return this.pos == this.lineStart };
    StringStream.prototype.peek = function () { return this.string.charAt(this.pos) || undefined };
    StringStream.prototype.next = function () {
        if (this.pos < this.string.length) { return this.string.charAt(this.pos++) }
    };
    StringStream.prototype.eat = function (match) {
        var ch = this.string.charAt(this.pos);
        var ok;
        if (typeof match == "string") { ok = ch == match; }
        else { ok = ch && (match.test ? match.test(ch) : match(ch)); }
        if (ok) { ++this.pos; return ch }
    };
    StringStream.prototype.eatWhile = function (match) {
        var start = this.pos;
        while (this.eat(match)) { }
        return this.pos > start
    };
    StringStream.prototype.eatSpace = function () {
        var start = this.pos;
        while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this.pos; }
        return this.pos > start
    };
    StringStream.prototype.skipToEnd = function () { this.pos = this.string.length; };
    StringStream.prototype.skipTo = function (ch) {
        var found = this.string.indexOf(ch, this.pos);
        if (found > -1) { this.pos = found; return true }
    };
    StringStream.prototype.backUp = function (n) { this.pos -= n; };
    StringStream.prototype.column = function () {
        if (this.lastColumnPos < this.start) {
            this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
            this.lastColumnPos = this.start;
        }
        return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
    };
    StringStream.prototype.indentation = function () {
        return countColumn(this.string, null, this.tabSize) -
            (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
    };
    StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
        if (typeof pattern == "string") {
            var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };
            var substr = this.string.substr(this.pos, pattern.length);
            if (cased(substr) == cased(pattern)) {
                if (consume !== false) { this.pos += pattern.length; }
                return true
            }
        } else {
            var match = this.string.slice(this.pos).match(pattern);
            if (match && match.index > 0) { return null }
            if (match && consume !== false) { this.pos += match[0].length; }
            return match
        }
    };
    StringStream.prototype.current = function () { return this.string.slice(this.start, this.pos) };
    StringStream.prototype.hideFirstChars = function (n, inner) {
        this.lineStart += n;
        try { return inner() }
        finally { this.lineStart -= n; }
    };
    StringStream.prototype.lookAhead = function (n) {
        var oracle = this.lineOracle;
        return oracle && oracle.lookAhead(n)
    };
    StringStream.prototype.baseToken = function () {
        var oracle = this.lineOracle;
        return oracle && oracle.baseToken(this.pos)
    };

    // Find the line object corresponding to the given line number.
    function getLine(doc, n) {
        n -= doc.first;
        if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
        var chunk = doc;
        while (!chunk.lines) {
            for (var i = 0; ; ++i) {
                var child = chunk.children[i], sz = child.chunkSize();
                if (n < sz) { chunk = child; break }
                n -= sz;
            }
        }
        return chunk.lines[n]
    }

    // Get the part of a document between two positions, as an array of
    // strings.
    function getBetween(doc, start, end) {
        var out = [], n = start.line;
        doc.iter(start.line, end.line + 1, function (line) {
            var text = line.text;
            if (n == end.line) { text = text.slice(0, end.ch); }
            if (n == start.line) { text = text.slice(start.ch); }
            out.push(text);
            ++n;
        });
        return out
    }
    // Get the lines between from and to, as array of strings.
    function getLines(doc, from, to) {
        var out = [];
        doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value
        return out
    }

    // Update the height of a line, propagating the height change
    // upwards to parent nodes.
    function updateLineHeight(line, height) {
        var diff = height - line.height;
        if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }
    }

    // Given a line object, find its line number by walking up through
    // its parent links.
    function lineNo(line) {
        if (line.parent == null) { return null }
        var cur = line.parent, no = indexOf(cur.lines, line);
        for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
            for (var i = 0; ; ++i) {
                if (chunk.children[i] == cur) { break }
                no += chunk.children[i].chunkSize();
            }
        }
        return no + cur.first
    }

    // Find the line at the given vertical position, using the height
    // information in the document tree.
    function lineAtHeight(chunk, h) {
        var n = chunk.first;
        outer: do {
            for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
                var child = chunk.children[i$1], ch = child.height;
                if (h < ch) { chunk = child; continue outer }
                h -= ch;
                n += child.chunkSize();
            }
            return n
        } while (!chunk.lines)
        var i = 0;
        for (; i < chunk.lines.length; ++i) {
            var line = chunk.lines[i], lh = line.height;
            if (h < lh) { break }
            h -= lh;
        }
        return n + i
    }

    function isLine(doc, l) { return l >= doc.first && l < doc.first + doc.size }

    function lineNumberFor(options, i) {
        return String(options.lineNumberFormatter(i + options.firstLineNumber))
    }

    // A Pos instance represents a position within the text.
    function Pos(line, ch, sticky) {
        if (sticky === void 0) sticky = null;

        if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
        this.line = line;
        this.ch = ch;
        this.sticky = sticky;
    }

    // Compare two positions, return 0 if they are the same, a negative
    // number when a is less, and a positive number otherwise.
    function cmp(a, b) { return a.line - b.line || a.ch - b.ch }

    function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }

    function copyPos(x) { return Pos(x.line, x.ch) }
    function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
    function minPos(a, b) { return cmp(a, b) < 0 ? a : b }

    // Most of the external API clips given positions to make sure they
    // actually exist within the document.
    function clipLine(doc, n) { return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1)) }
    function clipPos(doc, pos) {
        if (pos.line < doc.first) { return Pos(doc.first, 0) }
        var last = doc.first + doc.size - 1;
        if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
        return clipToLen(pos, getLine(doc, pos.line).text.length)
    }
    function clipToLen(pos, linelen) {
        var ch = pos.ch;
        if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
        else if (ch < 0) { return Pos(pos.line, 0) }
        else { return pos }
    }
    function clipPosArray(doc, array) {
        var out = [];
        for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }
        return out
    }

    var SavedContext = function (state, lookAhead) {
        this.state = state;
        this.lookAhead = lookAhead;
    };

    var Context = function (doc, state, line, lookAhead) {
        this.state = state;
        this.doc = doc;
        this.line = line;
        this.maxLookAhead = lookAhead || 0;
        this.baseTokens = null;
        this.baseTokenPos = 1;
    };

    Context.prototype.lookAhead = function (n) {
        var line = this.doc.getLine(this.line + n);
        if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }
        return line
    };

    Context.prototype.baseToken = function (n) {
        if (!this.baseTokens) { return null }
        while (this.baseTokens[this.baseTokenPos] <= n) { this.baseTokenPos += 2; }
        var type = this.baseTokens[this.baseTokenPos + 1];
        return {
            type: type && type.replace(/( |^)overlay .*/, ""),
            size: this.baseTokens[this.baseTokenPos] - n
        }
    };

    Context.prototype.nextLine = function () {
        this.line++;
        if (this.maxLookAhead > 0) { this.maxLookAhead--; }
    };

    Context.fromSaved = function (doc, saved, line) {
        if (saved instanceof SavedContext) { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }
        else { return new Context(doc, copyState(doc.mode, saved), line) }
    };

    Context.prototype.save = function (copy) {
        var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
        return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
    };


    // Compute a style array (an array starting with a mode generation
    // -- for invalidation -- followed by pairs of end positions and
    // style strings), which is used to highlight the tokens on the
    // line.
    function highlightLine(cm, line, context, forceToEnd) {
        // A styles array always starts with a number identifying the
        // mode/overlays that it is based on (for easy invalidation).
        var st = [cm.state.modeGen], lineClasses = {};
        // Compute the base array of styles
        runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },
            lineClasses, forceToEnd);
        var state = context.state;

        // Run overlays, adjust style array.
        var loop = function (o) {
            context.baseTokens = st;
            var overlay = cm.state.overlays[o], i = 1, at = 0;
            context.state = true;
            runMode(cm, line.text, overlay.mode, context, function (end, style) {
                var start = i;
                // Ensure there's a token end at the current position, and that i points at it
                while (at < end) {
                    var i_end = st[i];
                    if (i_end > end) { st.splice(i, 1, end, st[i + 1], i_end); }
                    i += 2;
                    at = Math.min(end, i_end);
                }
                if (!style) { return }
                if (overlay.opaque) {
                    st.splice(start, i - start, end, "overlay " + style);
                    i = start + 2;
                } else {
                    for (; start < i; start += 2) {
                        var cur = st[start + 1];
                        st[start + 1] = (cur ? cur + " " : "") + "overlay " + style;
                    }
                }
            }, lineClasses);
            context.state = state;
            context.baseTokens = null;
            context.baseTokenPos = 1;
        };

        for (var o = 0; o < cm.state.overlays.length; ++o) loop(o);

        return { styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null }
    }

    function getLineStyles(cm, line, updateFrontier) {
        if (!line.styles || line.styles[0] != cm.state.modeGen) {
            var context = getContextBefore(cm, lineNo(line));
            var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
            var result = highlightLine(cm, line, context);
            if (resetState) { context.state = resetState; }
            line.stateAfter = context.save(!resetState);
            line.styles = result.styles;
            if (result.classes) { line.styleClasses = result.classes; }
            else if (line.styleClasses) { line.styleClasses = null; }
            if (updateFrontier === cm.doc.highlightFrontier) { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }
        }
        return line.styles
    }

    function getContextBefore(cm, n, precise) {
        var doc = cm.doc, display = cm.display;
        if (!doc.mode.startState) { return new Context(doc, true, n) }
        var start = findStartLine(cm, n, precise);
        var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
        var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);

        doc.iter(start, n, function (line) {
            processLine(cm, line.text, context);
            var pos = context.line;
            line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
            context.nextLine();
        });
        if (precise) { doc.modeFrontier = context.line; }
        return context
    }

    // Lightweight form of highlight -- proceed over this line and
    // update state, but don't save a style array. Used for lines that
    // aren't currently visible.
    function processLine(cm, text, context, startAt) {
        var mode = cm.doc.mode;
        var stream = new StringStream(text, cm.options.tabSize, context);
        stream.start = stream.pos = startAt || 0;
        if (text == "") { callBlankLine(mode, context.state); }
        while (!stream.eol()) {
            readToken(mode, stream, context.state);
            stream.start = stream.pos;
        }
    }

    function callBlankLine(mode, state) {
        if (mode.blankLine) { return mode.blankLine(state) }
        if (!mode.innerMode) { return }
        var inner = innerMode(mode, state);
        if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
    }

    function readToken(mode, stream, state, inner) {
        for (var i = 0; i < 10; i++) {
            if (inner) { inner[0] = innerMode(mode, state).mode; }
            var style = mode.token(stream, state);
            if (stream.pos > stream.start) { return style }
        }
        throw new Error("Mode " + mode.name + " failed to advance stream.")
    }

    var Token = function (stream, type, state) {
        this.start = stream.start; this.end = stream.pos;
        this.string = stream.current();
        this.type = type || null;
        this.state = state;
    };

    // Utility for getTokenAt and getLineTokens
    function takeToken(cm, pos, precise, asArray) {
        var doc = cm.doc, mode = doc.mode, style;
        pos = clipPos(doc, pos);
        var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);
        var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;
        if (asArray) { tokens = []; }
        while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
            stream.start = stream.pos;
            style = readToken(mode, stream, context.state);
            if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }
        }
        return asArray ? tokens : new Token(stream, style, context.state)
    }

    function extractLineClasses(type, output) {
        if (type) {
            for (; ;) {
                var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
                if (!lineClass) { break }
                type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
                var prop = lineClass[1] ? "bgClass" : "textClass";
                if (output[prop] == null) { output[prop] = lineClass[2]; }
                else if (!(new RegExp("(?:^|\\s)" + lineClass[2] + "(?:$|\\s)")).test(output[prop])) { output[prop] += " " + lineClass[2]; }
            }
        }
        return type
    }

    // Run the given mode's parser over a line, calling f for each token.
    function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
        var flattenSpans = mode.flattenSpans;
        if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }
        var curStart = 0, curStyle = null;
        var stream = new StringStream(text, cm.options.tabSize, context), style;
        var inner = cm.options.addModeClass && [null];
        if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }
        while (!stream.eol()) {
            if (stream.pos > cm.options.maxHighlightLength) {
                flattenSpans = false;
                if (forceToEnd) { processLine(cm, text, context, stream.pos); }
                stream.pos = text.length;
                style = null;
            } else {
                style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
            }
            if (inner) {
                var mName = inner[0].name;
                if (mName) { style = "m-" + (style ? mName + " " + style : mName); }
            }
            if (!flattenSpans || curStyle != style) {
                while (curStart < stream.start) {
                    curStart = Math.min(stream.start, curStart + 5000);
                    f(curStart, curStyle);
                }
                curStyle = style;
            }
            stream.start = stream.pos;
        }
        while (curStart < stream.pos) {
            // Webkit seems to refuse to render text nodes longer than 57444
            // characters, and returns inaccurate measurements in nodes
            // starting around 5000 chars.
            var pos = Math.min(stream.pos, curStart + 5000);
            f(pos, curStyle);
            curStart = pos;
        }
    }

    // Finds the line to start with when starting a parse. Tries to
    // find a line with a stateAfter, so that it can start with a
    // valid state. If that fails, it returns the line with the
    // smallest indentation, which tends to need the least context to
    // parse correctly.
    function findStartLine(cm, n, precise) {
        var minindent, minline, doc = cm.doc;
        var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
        for (var search = n; search > lim; --search) {
            if (search <= doc.first) { return doc.first }
            var line = getLine(doc, search - 1), after = line.stateAfter;
            if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier)) { return search }
            var indented = countColumn(line.text, null, cm.options.tabSize);
            if (minline == null || minindent > indented) {
                minline = search - 1;
                minindent = indented;
            }
        }
        return minline
    }

    function retreatFrontier(doc, n) {
        doc.modeFrontier = Math.min(doc.modeFrontier, n);
        if (doc.highlightFrontier < n - 10) { return }
        var start = doc.first;
        for (var line = n - 1; line > start; line--) {
            var saved = getLine(doc, line).stateAfter;
            // change is on 3
            // state on line 1 looked ahead 2 -- so saw 3
            // test 1 + 2 < 3 should cover this
            if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
                start = line + 1;
                break
            }
        }
        doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
    }

    // Optimize some code when these features are not used.
    var sawReadOnlySpans = false, sawCollapsedSpans = false;

    function seeReadOnlySpans() {
        sawReadOnlySpans = true;
    }

    function seeCollapsedSpans() {
        sawCollapsedSpans = true;
    }

    // TEXTMARKER SPANS

    function MarkedSpan(marker, from, to) {
        this.marker = marker;
        this.from = from; this.to = to;
    }

    // Search an array of spans for a span matching the given marker.
    function getMarkedSpanFor(spans, marker) {
        if (spans) {
            for (var i = 0; i < spans.length; ++i) {
                var span = spans[i];
                if (span.marker == marker) { return span }
            }
        }
    }

    // Remove a span from an array, returning undefined if no spans are
    // left (we don't store arrays for lines without spans).
    function removeMarkedSpan(spans, span) {
        var r;
        for (var i = 0; i < spans.length; ++i) { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }
        return r
    }

    // Add a span to a line.
    function addMarkedSpan(line, span, op) {
        var inThisOp = op && window.WeakSet && (op.markedSpans || (op.markedSpans = new WeakSet));
        if (inThisOp && line.markedSpans && inThisOp.has(line.markedSpans)) {
            line.markedSpans.push(span);
        } else {
            line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
            if (inThisOp) { inThisOp.add(line.markedSpans); }
        }
        span.marker.attachLine(line);
    }

    // Used for the algorithm that adjusts markers for a change in the
    // document. These functions cut an array of spans at a given
    // character position, returning an array of remaining chunks (or
    // undefined if nothing remains).
    function markedSpansBefore(old, startCh, isInsert) {
        var nw;
        if (old) {
            for (var i = 0; i < old.length; ++i) {
                var span = old[i], marker = span.marker;
                var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
                if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
                    var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
                        ; (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
                }
            }
        }
        return nw
    }
    function markedSpansAfter(old, endCh, isInsert) {
        var nw;
        if (old) {
            for (var i = 0; i < old.length; ++i) {
                var span = old[i], marker = span.marker;
                var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
                if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
                    var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
                        ; (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
                            span.to == null ? null : span.to - endCh));
                }
            }
        }
        return nw
    }

    // Given a change object, compute the new set of marker spans that
    // cover the line in which the change took place. Removes spans
    // entirely within the change, reconnects spans belonging to the
    // same marker that appear on both sides of the change, and cuts off
    // spans partially within the change. Returns an array of span
    // arrays with one element for each line in (after) the change.
    function stretchSpansOverChange(doc, change) {
        if (change.full) { return null }
        var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
        var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
        if (!oldFirst && !oldLast) { return null }

        var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
        // Get the spans that 'stick out' on both sides
        var first = markedSpansBefore(oldFirst, startCh, isInsert);
        var last = markedSpansAfter(oldLast, endCh, isInsert);

        // Next, merge those two ends
        var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
        if (first) {
            // Fix up .to properties of first
            for (var i = 0; i < first.length; ++i) {
                var span = first[i];
                if (span.to == null) {
                    var found = getMarkedSpanFor(last, span.marker);
                    if (!found) { span.to = startCh; }
                    else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }
                }
            }
        }
        if (last) {
            // Fix up .from in last (or move them into first in case of sameLine)
            for (var i$1 = 0; i$1 < last.length; ++i$1) {
                var span$1 = last[i$1];
                if (span$1.to != null) { span$1.to += offset; }
                if (span$1.from == null) {
                    var found$1 = getMarkedSpanFor(first, span$1.marker);
                    if (!found$1) {
                        span$1.from = offset;
                        if (sameLine) { (first || (first = [])).push(span$1); }
                    }
                } else {
                    span$1.from += offset;
                    if (sameLine) { (first || (first = [])).push(span$1); }
                }
            }
        }
        // Make sure we didn't create any zero-length spans
        if (first) { first = clearEmptySpans(first); }
        if (last && last != first) { last = clearEmptySpans(last); }

        var newMarkers = [first];
        if (!sameLine) {
            // Fill gap with whole-line-spans
            var gap = change.text.length - 2, gapMarkers;
            if (gap > 0 && first) {
                for (var i$2 = 0; i$2 < first.length; ++i$2) {
                    if (first[i$2].to == null) { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); }
                }
            }
            for (var i$3 = 0; i$3 < gap; ++i$3) { newMarkers.push(gapMarkers); }
            newMarkers.push(last);
        }
        return newMarkers
    }

    // Remove spans that are empty and don't have a clearWhenEmpty
    // option of false.
    function clearEmptySpans(spans) {
        for (var i = 0; i < spans.length; ++i) {
            var span = spans[i];
            if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false) { spans.splice(i--, 1); }
        }
        if (!spans.length) { return null }
        return spans
    }

    // Used to 'clip' out readOnly ranges when making a change.
    function removeReadOnlyRanges(doc, from, to) {
        var markers = null;
        doc.iter(from.line, to.line + 1, function (line) {
            if (line.markedSpans) {
                for (var i = 0; i < line.markedSpans.length; ++i) {
                    var mark = line.markedSpans[i].marker;
                    if (mark.readOnly && (!markers || indexOf(markers, mark) == -1)) { (markers || (markers = [])).push(mark); }
                }
            }
        });
        if (!markers) { return null }
        var parts = [{ from: from, to: to }];
        for (var i = 0; i < markers.length; ++i) {
            var mk = markers[i], m = mk.find(0);
            for (var j = 0; j < parts.length; ++j) {
                var p = parts[j];
                if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
                var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
                if (dfrom < 0 || !mk.inclusiveLeft && !dfrom) { newParts.push({ from: p.from, to: m.from }); }
                if (dto > 0 || !mk.inclusiveRight && !dto) { newParts.push({ from: m.to, to: p.to }); }
                parts.splice.apply(parts, newParts);
                j += newParts.length - 3;
            }
        }
        return parts
    }

    // Connect or disconnect spans from a line.
    function detachMarkedSpans(line) {
        var spans = line.markedSpans;
        if (!spans) { return }
        for (var i = 0; i < spans.length; ++i) { spans[i].marker.detachLine(line); }
        line.markedSpans = null;
    }
    function attachMarkedSpans(line, spans) {
        if (!spans) { return }
        for (var i = 0; i < spans.length; ++i) { spans[i].marker.attachLine(line); }
        line.markedSpans = spans;
    }

    // Helpers used when computing which overlapping collapsed span
    // counts as the larger one.
    function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
    function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }

    // Returns a number indicating which of two overlapping collapsed
    // spans is larger (and thus includes the other). Falls back to
    // comparing ids when the spans cover exactly the same range.
    function compareCollapsedMarkers(a, b) {
        var lenDiff = a.lines.length - b.lines.length;
        if (lenDiff != 0) { return lenDiff }
        var aPos = a.find(), bPos = b.find();
        var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
        if (fromCmp) { return -fromCmp }
        var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
        if (toCmp) { return toCmp }
        return b.id - a.id
    }

    // Find out whether a line ends or starts in a collapsed span. If
    // so, return the marker for that span.
    function collapsedSpanAtSide(line, start) {
        var sps = sawCollapsedSpans && line.markedSpans, found;
        if (sps) {
            for (var sp = (void 0), i = 0; i < sps.length; ++i) {
                sp = sps[i];
                if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
                    (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }
            }
        }
        return found
    }
    function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
    function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }

    function collapsedSpanAround(line, ch) {
        var sps = sawCollapsedSpans && line.markedSpans, found;
        if (sps) {
            for (var i = 0; i < sps.length; ++i) {
                var sp = sps[i];
                if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&
                    (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }
            }
        }
        return found
    }

    // Test whether there exists a collapsed span that partially
    // overlaps (covers the start or end, but not both) of a new span.
    // Such overlap is not allowed.
    function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
        var line = getLine(doc, lineNo);
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
            for (var i = 0; i < sps.length; ++i) {
                var sp = sps[i];
                if (!sp.marker.collapsed) { continue }
                var found = sp.marker.find(0);
                var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
                var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
                if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
                if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
                    fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0)) { return true }
            }
        }
    }

    // A visual line is a line as drawn on the screen. Folding, for
    // example, can cause multiple logical lines to appear on the same
    // visual line. This finds the start of the visual line that the
    // given line is part of (usually that is the line itself).
    function visualLine(line) {
        var merged;
        while (merged = collapsedSpanAtStart(line)) { line = merged.find(-1, true).line; }
        return line
    }

    function visualLineEnd(line) {
        var merged;
        while (merged = collapsedSpanAtEnd(line)) { line = merged.find(1, true).line; }
        return line
    }

    // Returns an array of logical lines that continue the visual line
    // started by the argument, or undefined if there are no such lines.
    function visualLineContinued(line) {
        var merged, lines;
        while (merged = collapsedSpanAtEnd(line)) {
            line = merged.find(1, true).line
                ; (lines || (lines = [])).push(line);
        }
        return lines
    }

    // Get the line number of the start of the visual line that the
    // given line number is part of.
    function visualLineNo(doc, lineN) {
        var line = getLine(doc, lineN), vis = visualLine(line);
        if (line == vis) { return lineN }
        return lineNo(vis)
    }

    // Get the line number of the start of the next visual line after
    // the given line.
    function visualLineEndNo(doc, lineN) {
        if (lineN > doc.lastLine()) { return lineN }
        var line = getLine(doc, lineN), merged;
        if (!lineIsHidden(doc, line)) { return lineN }
        while (merged = collapsedSpanAtEnd(line)) { line = merged.find(1, true).line; }
        return lineNo(line) + 1
    }

    // Compute whether a line is hidden. Lines count as hidden when they
    // are part of a visual line that starts with another line, or when
    // they are entirely covered by collapsed, non-widget span.
    function lineIsHidden(doc, line) {
        var sps = sawCollapsedSpans && line.markedSpans;
        if (sps) {
            for (var sp = (void 0), i = 0; i < sps.length; ++i) {
                sp = sps[i];
                if (!sp.marker.collapsed) { continue }
                if (sp.from == null) { return true }
                if (sp.marker.widgetNode) { continue }
                if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp)) { return true }
            }
        }
    }
    function lineIsHiddenInner(doc, line, span) {
        if (span.to == null) {
            var end = span.marker.find(1, true);
            return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
        }
        if (span.marker.inclusiveRight && span.to == line.text.length) { return true }
        for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
            sp = line.markedSpans[i];
            if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
                (sp.to == null || sp.to != span.from) &&
                (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
                lineIsHiddenInner(doc, line, sp)) { return true }
        }
    }

    // Find the height above the given line.
    function heightAtLine(lineObj) {
        lineObj = visualLine(lineObj);

        var h = 0, chunk = lineObj.parent;
        for (var i = 0; i < chunk.lines.length; ++i) {
            var line = chunk.lines[i];
            if (line == lineObj) { break }
            else { h += line.height; }
        }
        for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
            for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
                var cur = p.children[i$1];
                if (cur == chunk) { break }
                else { h += cur.height; }
            }
        }
        return h
    }

    // Compute the character length of a line, taking into account
    // collapsed ranges (see markText) that might hide parts, and join
    // other lines onto it.
    function lineLength(line) {
        if (line.height == 0) { return 0 }
        var len = line.text.length, merged, cur = line;
        while (merged = collapsedSpanAtStart(cur)) {
            var found = merged.find(0, true);
            cur = found.from.line;
            len += found.from.ch - found.to.ch;
        }
        cur = line;
        while (merged = collapsedSpanAtEnd(cur)) {
            var found$1 = merged.find(0, true);
            len -= cur.text.length - found$1.from.ch;
            cur = found$1.to.line;
            len += cur.text.length - found$1.to.ch;
        }
        return len
    }

    // Find the longest line in the document.
    function findMaxLine(cm) {
        var d = cm.display, doc = cm.doc;
        d.maxLine = getLine(doc, doc.first);
        d.maxLineLength = lineLength(d.maxLine);
        d.maxLineChanged = true;
        doc.iter(function (line) {
            var len = lineLength(line);
            if (len > d.maxLineLength) {
                d.maxLineLength = len;
                d.maxLine = line;
            }
        });
    }

    // LINE DATA STRUCTURE

    // Line objects. These hold state related to a line, including
    // highlighting info (the styles array).
    var Line = function (text, markedSpans, estimateHeight) {
        this.text = text;
        attachMarkedSpans(this, markedSpans);
        this.height = estimateHeight ? estimateHeight(this) : 1;
    };

    Line.prototype.lineNo = function () { return lineNo(this) };
    eventMixin(Line);

    // Change the content (text, markers) of a line. Automatically
    // invalidates cached information and tries to re-estimate the
    // line's height.
    function updateLine(line, text, markedSpans, estimateHeight) {
        line.text = text;
        if (line.stateAfter) { line.stateAfter = null; }
        if (line.styles) { line.styles = null; }
        if (line.order != null) { line.order = null; }
        detachMarkedSpans(line);
        attachMarkedSpans(line, markedSpans);
        var estHeight = estimateHeight ? estimateHeight(line) : 1;
        if (estHeight != line.height) { updateLineHeight(line, estHeight); }
    }

    // Detach a line from the document tree and its markers.
    function cleanUpLine(line) {
        line.parent = null;
        detachMarkedSpans(line);
    }

    // Convert a style as returned by a mode (either null, or a string
    // containing one or more styles) to a CSS style. This is cached,
    // and also looks for line-wide styles.
    var styleToClassCache = {}, styleToClassCacheWithMode = {};
    function interpretTokenStyle(style, options) {
        if (!style || /^\s*$/.test(style)) { return null }
        var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
        return cache[style] ||
            (cache[style] = style.replace(/\S+/g, "cm-$&"))
    }

    // Render the DOM representation of the text of a line. Also builds
    // up a 'line map', which points at the DOM nodes that represent
    // specific stretches of text, and is used by the measuring code.
    // The returned object contains the DOM node, this map, and
    // information about line-wide styles that were set by the mode.
    function buildLineContent(cm, lineView) {
        // The padding-right forces the element to have a 'border', which
        // is needed on Webkit to be able to get line-level bounding
        // rectangles for it (in measureChar).
        var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
        var builder = {
            pre: eltP("pre", [content], "CodeMirror-line"), content: content,
            col: 0, pos: 0, cm: cm,
            trailingSpace: false,
            splitSpaces: cm.getOption("lineWrapping")
        };
        lineView.measure = {};

        // Iterate over the logical lines that make up this visual line.
        for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
            var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);
            builder.pos = 0;
            builder.addToken = buildToken;
            // Optionally wire in some hacks into the token-rendering
            // algorithm, to deal with browser quirks.
            if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction))) { builder.addToken = buildTokenBadBidi(builder.addToken, order); }
            builder.map = [];
            var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
            insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
            if (line.styleClasses) {
                if (line.styleClasses.bgClass) { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || ""); }
                if (line.styleClasses.textClass) { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || ""); }
            }

            // Ensure at least a single node is present, for measuring.
            if (builder.map.length == 0) { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }

            // Store the map and a cache object for the current logical line
            if (i == 0) {
                lineView.measure.map = builder.map;
                lineView.measure.cache = {};
            } else {
                (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
                    ; (lineView.measure.caches || (lineView.measure.caches = [])).push({});
            }
        }

        // See issue #2901
        if (webkit) {
            var last = builder.content.lastChild;
            if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab"))) { builder.content.className = "cm-tab-wrap-hack"; }
        }

        signal(cm, "renderLine", cm, lineView.line, builder.pre);
        if (builder.pre.className) { builder.textClass = joinClasses(builder.pre.className, builder.textClass || ""); }

        return builder
    }

    function defaultSpecialCharPlaceholder(ch) {
        var token = elt("span", "\u2022", "cm-invalidchar");
        token.title = "\\u" + ch.charCodeAt(0).toString(16);
        token.setAttribute("aria-label", token.title);
        return token
    }

    // Build up the DOM representation for a single token, and add it to
    // the line map. Takes care to render special characters separately.
    function buildToken(builder, text, style, startStyle, endStyle, css, attributes) {
        if (!text) { return }
        var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
        var special = builder.cm.state.specialChars, mustWrap = false;
        var content;
        if (!special.test(text)) {
            builder.col += text.length;
            content = document.createTextNode(displayText);
            builder.map.push(builder.pos, builder.pos + text.length, content);
            if (ie && ie_version < 9) { mustWrap = true; }
            builder.pos += text.length;
        } else {
            content = document.createDocumentFragment();
            var pos = 0;
            while (true) {
                special.lastIndex = pos;
                var m = special.exec(text);
                var skipped = m ? m.index - pos : text.length - pos;
                if (skipped) {
                    var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
                    if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])); }
                    else { content.appendChild(txt); }
                    builder.map.push(builder.pos, builder.pos + skipped, txt);
                    builder.col += skipped;
                    builder.pos += skipped;
                }
                if (!m) { break }
                pos += skipped + 1;
                var txt$1 = (void 0);
                if (m[0] == "\t") {
                    var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
                    txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
                    txt$1.setAttribute("role", "presentation");
                    txt$1.setAttribute("cm-text", "\t");
                    builder.col += tabWidth;
                } else if (m[0] == "\r" || m[0] == "\n") {
                    txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
                    txt$1.setAttribute("cm-text", m[0]);
                    builder.col += 1;
                } else {
                    txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
                    txt$1.setAttribute("cm-text", m[0]);
                    if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])); }
                    else { content.appendChild(txt$1); }
                    builder.col += 1;
                }
                builder.map.push(builder.pos, builder.pos + 1, txt$1);
                builder.pos++;
            }
        }
        builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
        if (style || startStyle || endStyle || mustWrap || css || attributes) {
            var fullStyle = style || "";
            if (startStyle) { fullStyle += startStyle; }
            if (endStyle) { fullStyle += endStyle; }
            var token = elt("span", [content], fullStyle, css);
            if (attributes) {
                for (var attr in attributes) {
                    if (attributes.hasOwnProperty(attr) && attr != "style" && attr != "class") { token.setAttribute(attr, attributes[attr]); }
                }
            }
            return builder.content.appendChild(token)
        }
        builder.content.appendChild(content);
    }

    // Change some spaces to NBSP to prevent the browser from collapsing
    // trailing spaces at the end of a line when rendering text (issue #1362).
    function splitSpaces(text, trailingBefore) {
        if (text.length > 1 && !/  /.test(text)) { return text }
        var spaceBefore = trailingBefore, result = "";
        for (var i = 0; i < text.length; i++) {
            var ch = text.charAt(i);
            if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32)) { ch = "\u00a0"; }
            result += ch;
            spaceBefore = ch == " ";
        }
        return result
    }

    // Work around nonsense dimensions being reported for stretches of
    // right-to-left text.
    function buildTokenBadBidi(inner, order) {
        return function (builder, text, style, startStyle, endStyle, css, attributes) {
            style = style ? style + " cm-force-border" : "cm-force-border";
            var start = builder.pos, end = start + text.length;
            for (; ;) {
                // Find the part that overlaps with the start of this text
                var part = (void 0);
                for (var i = 0; i < order.length; i++) {
                    part = order[i];
                    if (part.to > start && part.from <= start) { break }
                }
                if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, css, attributes) }
                inner(builder, text.slice(0, part.to - start), style, startStyle, null, css, attributes);
                startStyle = null;
                text = text.slice(part.to - start);
                start = part.to;
            }
        }
    }

    function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
        var widget = !ignoreWidget && marker.widgetNode;
        if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }
        if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
            if (!widget) { widget = builder.content.appendChild(document.createElement("span")); }
            widget.setAttribute("cm-marker", marker.id);
        }
        if (widget) {
            builder.cm.display.input.setUneditable(widget);
            builder.content.appendChild(widget);
        }
        builder.pos += size;
        builder.trailingSpace = false;
    }

    // Outputs a number of spans to make up a line, taking highlighting
    // and marked text into account.
    function insertLineContent(line, builder, styles) {
        var spans = line.markedSpans, allText = line.text, at = 0;
        if (!spans) {
            for (var i$1 = 1; i$1 < styles.length; i$1 += 2) { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1 + 1], builder.cm.options)); }
            return
        }

        var len = allText.length, pos = 0, i = 1, text = "", style, css;
        var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed, attributes;
        for (; ;) {
            if (nextChange == pos) { // Update current marker set
                spanStyle = spanEndStyle = spanStartStyle = css = "";
                attributes = null;
                collapsed = null; nextChange = Infinity;
                var foundBookmarks = [], endStyles = (void 0);
                for (var j = 0; j < spans.length; ++j) {
                    var sp = spans[j], m = sp.marker;
                    if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
                        foundBookmarks.push(m);
                    } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
                        if (sp.to != null && sp.to != pos && nextChange > sp.to) {
                            nextChange = sp.to;
                            spanEndStyle = "";
                        }
                        if (m.className) { spanStyle += " " + m.className; }
                        if (m.css) { css = (css ? css + ";" : "") + m.css; }
                        if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle; }
                        if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }
                        // support for the old title property
                        // https://github.com/codemirror/CodeMirror/pull/5673
                        if (m.title) { (attributes || (attributes = {})).title = m.title; }
                        if (m.attributes) {
                            for (var attr in m.attributes) { (attributes || (attributes = {}))[attr] = m.attributes[attr]; }
                        }
                        if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0)) { collapsed = sp; }
                    } else if (sp.from > pos && nextChange > sp.from) {
                        nextChange = sp.from;
                    }
                }
                if (endStyles) {
                    for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2) { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1]; } }
                }

                if (!collapsed || collapsed.from == pos) {
                    for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2) { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); }
                }
                if (collapsed && (collapsed.from || 0) == pos) {
                    buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                        collapsed.marker, collapsed.from == null);
                    if (collapsed.to == null) { return }
                    if (collapsed.to == pos) { collapsed = false; }
                }
            }
            if (pos >= len) { break }

            var upto = Math.min(len, nextChange);
            while (true) {
                if (text) {
                    var end = pos + text.length;
                    if (!collapsed) {
                        var tokenText = end > upto ? text.slice(0, upto - pos) : text;
                        builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                            spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", css, attributes);
                    }
                    if (end >= upto) { text = text.slice(upto - pos); pos = upto; break }
                    pos = end;
                    spanStartStyle = "";
                }
                text = allText.slice(at, at = styles[i++]);
                style = interpretTokenStyle(styles[i++], builder.cm.options);
            }
        }
    }


    // These objects are used to represent the visible (currently drawn)
    // part of the document. A LineView may correspond to multiple
    // logical lines, if those are connected by collapsed ranges.
    function LineView(doc, line, lineN) {
        // The starting line
        this.line = line;
        // Continuing lines, if any
        this.rest = visualLineContinued(line);
        // Number of logical lines in this visual line
        this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
        this.node = this.text = null;
        this.hidden = lineIsHidden(doc, line);
    }

    // Create a range of LineView objects for the given lines.
    function buildViewArray(cm, from, to) {
        var array = [], nextPos;
        for (var pos = from; pos < to; pos = nextPos) {
            var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
            nextPos = pos + view.size;
            array.push(view);
        }
        return array
    }

    var operationGroup = null;

    function pushOperation(op) {
        if (operationGroup) {
            operationGroup.ops.push(op);
        } else {
            op.ownsGroup = operationGroup = {
                ops: [op],
                delayedCallbacks: []
            };
        }
    }

    function fireCallbacksForOps(group) {
        // Calls delayed callbacks and cursorActivity handlers until no
        // new ones appear
        var callbacks = group.delayedCallbacks, i = 0;
        do {
            for (; i < callbacks.length; i++) { callbacks[i].call(null); }
            for (var j = 0; j < group.ops.length; j++) {
                var op = group.ops[j];
                if (op.cursorActivityHandlers) {
                    while (op.cursorActivityCalled < op.cursorActivityHandlers.length) { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); }
                }
            }
        } while (i < callbacks.length)
    }

    function finishOperation(op, endCb) {
        var group = op.ownsGroup;
        if (!group) { return }

        try { fireCallbacksForOps(group); }
        finally {
            operationGroup = null;
            endCb(group);
        }
    }

    var orphanDelayedCallbacks = null;

    // Often, we want to signal events at a point where we are in the
    // middle of some work, but don't want the handler to start calling
    // other methods on the editor, which might be in an inconsistent
    // state or simply not expect any other events to happen.
    // signalLater looks whether there are any handlers, and schedules
    // them to be executed when the last operation ends, or, if no
    // operation is active, when a timeout fires.
    function signalLater(emitter, type /*, values...*/) {
        var arr = getHandlers(emitter, type);
        if (!arr.length) { return }
        var args = Array.prototype.slice.call(arguments, 2), list;
        if (operationGroup) {
            list = operationGroup.delayedCallbacks;
        } else if (orphanDelayedCallbacks) {
            list = orphanDelayedCallbacks;
        } else {
            list = orphanDelayedCallbacks = [];
            setTimeout(fireOrphanDelayed, 0);
        }
        var loop = function (i) {
            list.push(function () { return arr[i].apply(null, args); });
        };

        for (var i = 0; i < arr.length; ++i)
            loop(i);
    }

    function fireOrphanDelayed() {
        var delayed = orphanDelayedCallbacks;
        orphanDelayedCallbacks = null;
        for (var i = 0; i < delayed.length; ++i) { delayed[i](); }
    }

    // When an aspect of a line changes, a string is added to
    // lineView.changes. This updates the relevant part of the line's
    // DOM structure.
    function updateLineForChanges(cm, lineView, lineN, dims) {
        for (var j = 0; j < lineView.changes.length; j++) {
            var type = lineView.changes[j];
            if (type == "text") { updateLineText(cm, lineView); }
            else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims); }
            else if (type == "class") { updateLineClasses(cm, lineView); }
            else if (type == "widget") { updateLineWidgets(cm, lineView, dims); }
        }
        lineView.changes = null;
    }

    // Lines with gutter elements, widgets or a background class need to
    // be wrapped, and have the extra elements added to the wrapper div
    function ensureLineWrapped(lineView) {
        if (lineView.node == lineView.text) {
            lineView.node = elt("div", null, null, "position: relative");
            if (lineView.text.parentNode) { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }
            lineView.node.appendChild(lineView.text);
            if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }
        }
        return lineView.node
    }

    function updateLineBackground(cm, lineView) {
        var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
        if (cls) { cls += " CodeMirror-linebackground"; }
        if (lineView.background) {
            if (cls) { lineView.background.className = cls; }
            else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
        } else if (cls) {
            var wrap = ensureLineWrapped(lineView);
            lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
            cm.display.input.setUneditable(lineView.background);
        }
    }

    // Wrapper around buildLineContent which will reuse the structure
    // in display.externalMeasured when possible.
    function getLineContent(cm, lineView) {
        var ext = cm.display.externalMeasured;
        if (ext && ext.line == lineView.line) {
            cm.display.externalMeasured = null;
            lineView.measure = ext.measure;
            return ext.built
        }
        return buildLineContent(cm, lineView)
    }

    // Redraw the line's text. Interacts with the background and text
    // classes because the mode may output tokens that influence these
    // classes.
    function updateLineText(cm, lineView) {
        var cls = lineView.text.className;
        var built = getLineContent(cm, lineView);
        if (lineView.text == lineView.node) { lineView.node = built.pre; }
        lineView.text.parentNode.replaceChild(built.pre, lineView.text);
        lineView.text = built.pre;
        if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
            lineView.bgClass = built.bgClass;
            lineView.textClass = built.textClass;
            updateLineClasses(cm, lineView);
        } else if (cls) {
            lineView.text.className = cls;
        }
    }

    function updateLineClasses(cm, lineView) {
        updateLineBackground(cm, lineView);
        if (lineView.line.wrapClass) { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }
        else if (lineView.node != lineView.text) { lineView.node.className = ""; }
        var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
        lineView.text.className = textClass || "";
    }

    function updateLineGutter(cm, lineView, lineN, dims) {
        if (lineView.gutter) {
            lineView.node.removeChild(lineView.gutter);
            lineView.gutter = null;
        }
        if (lineView.gutterBackground) {
            lineView.node.removeChild(lineView.gutterBackground);
            lineView.gutterBackground = null;
        }
        if (lineView.line.gutterClass) {
            var wrap = ensureLineWrapped(lineView);
            lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
                ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
            cm.display.input.setUneditable(lineView.gutterBackground);
            wrap.insertBefore(lineView.gutterBackground, lineView.text);
        }
        var markers = lineView.line.gutterMarkers;
        if (cm.options.lineNumbers || markers) {
            var wrap$1 = ensureLineWrapped(lineView);
            var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
            gutterWrap.setAttribute("aria-hidden", "true");
            cm.display.input.setUneditable(gutterWrap);
            wrap$1.insertBefore(gutterWrap, lineView.text);
            if (lineView.line.gutterClass) { gutterWrap.className += " " + lineView.line.gutterClass; }
            if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"])) {
                lineView.lineNumber = gutterWrap.appendChild(
                    elt("div", lineNumberFor(cm.options, lineN),
                        "CodeMirror-linenumber CodeMirror-gutter-elt",
                        ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px")));
            }
            if (markers) {
                for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {
                    var id = cm.display.gutterSpecs[k].className, found = markers.hasOwnProperty(id) && markers[id];
                    if (found) {
                        gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
                            ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px")));
                    }
                }
            }
        }
    }

    function updateLineWidgets(cm, lineView, dims) {
        if (lineView.alignable) { lineView.alignable = null; }
        var isWidget = classTest("CodeMirror-linewidget");
        for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
            next = node.nextSibling;
            if (isWidget.test(node.className)) { lineView.node.removeChild(node); }
        }
        insertLineWidgets(cm, lineView, dims);
    }

    // Build a line's DOM representation from scratch
    function buildLineElement(cm, lineView, lineN, dims) {
        var built = getLineContent(cm, lineView);
        lineView.text = lineView.node = built.pre;
        if (built.bgClass) { lineView.bgClass = built.bgClass; }
        if (built.textClass) { lineView.textClass = built.textClass; }

        updateLineClasses(cm, lineView);
        updateLineGutter(cm, lineView, lineN, dims);
        insertLineWidgets(cm, lineView, dims);
        return lineView.node
    }

    // A lineView may contain multiple logical lines (when merged by
    // collapsed spans). The widgets for all of them need to be drawn.
    function insertLineWidgets(cm, lineView, dims) {
        insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
        if (lineView.rest) {
            for (var i = 0; i < lineView.rest.length; i++) { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); }
        }
    }

    function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
        if (!line.widgets) { return }
        var wrap = ensureLineWrapped(lineView);
        for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
            var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget" + (widget.className ? " " + widget.className : ""));
            if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true"); }
            positionLineWidget(widget, node, lineView, dims);
            cm.display.input.setUneditable(node);
            if (allowAbove && widget.above) { wrap.insertBefore(node, lineView.gutter || lineView.text); }
            else { wrap.appendChild(node); }
            signalLater(widget, "redraw");
        }
    }

    function positionLineWidget(widget, node, lineView, dims) {
        if (widget.noHScroll) {
            (lineView.alignable || (lineView.alignable = [])).push(node);
            var width = dims.wrapperWidth;
            node.style.left = dims.fixedPos + "px";
            if (!widget.coverGutter) {
                width -= dims.gutterTotalWidth;
                node.style.paddingLeft = dims.gutterTotalWidth + "px";
            }
            node.style.width = width + "px";
        }
        if (widget.coverGutter) {
            node.style.zIndex = 5;
            node.style.position = "relative";
            if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px"; }
        }
    }

    function widgetHeight(widget) {
        if (widget.height != null) { return widget.height }
        var cm = widget.doc.cm;
        if (!cm) { return 0 }
        if (!contains(document.body, widget.node)) {
            var parentStyle = "position: relative;";
            if (widget.coverGutter) { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;"; }
            if (widget.noHScroll) { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;"; }
            removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
        }
        return widget.height = widget.node.parentNode.offsetHeight
    }

    // Return true when the given mouse event happened in a widget
    function eventInWidget(display, e) {
        for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
            if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
                (n.parentNode == display.sizer && n != display.mover)) { return true }
        }
    }

    // POSITION MEASUREMENT

    function paddingTop(display) { return display.lineSpace.offsetTop }
    function paddingVert(display) { return display.mover.offsetHeight - display.lineSpace.offsetHeight }
    function paddingH(display) {
        if (display.cachedPaddingH) { return display.cachedPaddingH }
        var e = removeChildrenAndAdd(display.measure, elt("pre", "x", "CodeMirror-line-like"));
        var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
        var data = { left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight) };
        if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }
        return data
    }

    function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
    function displayWidth(cm) {
        return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
    }
    function displayHeight(cm) {
        return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
    }

    // Ensure the lineView.wrapping.heights array is populated. This is
    // an array of bottom offsets for the lines that make up a drawn
    // line. When lineWrapping is on, there might be more than one
    // height.
    function ensureLineHeights(cm, lineView, rect) {
        var wrapping = cm.options.lineWrapping;
        var curWidth = wrapping && displayWidth(cm);
        if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
            var heights = lineView.measure.heights = [];
            if (wrapping) {
                lineView.measure.width = curWidth;
                var rects = lineView.text.firstChild.getClientRects();
                for (var i = 0; i < rects.length - 1; i++) {
                    var cur = rects[i], next = rects[i + 1];
                    if (Math.abs(cur.bottom - next.bottom) > 2) { heights.push((cur.bottom + next.top) / 2 - rect.top); }
                }
            }
            heights.push(rect.bottom - rect.top);
        }
    }

    // Find a line map (mapping character offsets to text nodes) and a
    // measurement cache for the given line number. (A line view might
    // contain multiple lines when collapsed ranges are present.)
    function mapFromLineView(lineView, line, lineN) {
        if (lineView.line == line) { return { map: lineView.measure.map, cache: lineView.measure.cache } }
        if (lineView.rest) {
            for (var i = 0; i < lineView.rest.length; i++) {
                if (lineView.rest[i] == line) { return { map: lineView.measure.maps[i], cache: lineView.measure.caches[i] } }
            }
            for (var i$1 = 0; i$1 < lineView.rest.length; i$1++) {
                if (lineNo(lineView.rest[i$1]) > lineN) { return { map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true } }
            }
        }
    }

    // Render a line into the hidden node display.externalMeasured. Used
    // when measurement is needed for a line that's not in the viewport.
    function updateExternalMeasurement(cm, line) {
        line = visualLine(line);
        var lineN = lineNo(line);
        var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
        view.lineN = lineN;
        var built = view.built = buildLineContent(cm, view);
        view.text = built.pre;
        removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
        return view
    }

    // Get a {top, bottom, left, right} box (in line-local coordinates)
    // for a given character.
    function measureChar(cm, line, ch, bias) {
        return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
    }

    // Find a line view that corresponds to the given line number.
    function findViewForLine(cm, lineN) {
        if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo) { return cm.display.view[findViewIndex(cm, lineN)] }
        var ext = cm.display.externalMeasured;
        if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size) { return ext }
    }

    // Measurement can be split in two steps, the set-up work that
    // applies to the whole line, and the measurement of the actual
    // character. Functions like coordsChar, that need to do a lot of
    // measurements in a row, can thus ensure that the set-up work is
    // only done once.
    function prepareMeasureForLine(cm, line) {
        var lineN = lineNo(line);
        var view = findViewForLine(cm, lineN);
        if (view && !view.text) {
            view = null;
        } else if (view && view.changes) {
            updateLineForChanges(cm, view, lineN, getDimensions(cm));
            cm.curOp.forceUpdate = true;
        }
        if (!view) { view = updateExternalMeasurement(cm, line); }

        var info = mapFromLineView(view, line, lineN);
        return {
            line: line, view: view, rect: null,
            map: info.map, cache: info.cache, before: info.before,
            hasHeights: false
        }
    }

    // Given a prepared measurement object, measures the position of an
    // actual character (or fetches it from the cache).
    function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
        if (prepared.before) { ch = -1; }
        var key = ch + (bias || ""), found;
        if (prepared.cache.hasOwnProperty(key)) {
            found = prepared.cache[key];
        } else {
            if (!prepared.rect) { prepared.rect = prepared.view.text.getBoundingClientRect(); }
            if (!prepared.hasHeights) {
                ensureLineHeights(cm, prepared.view, prepared.rect);
                prepared.hasHeights = true;
            }
            found = measureCharInner(cm, prepared, ch, bias);
            if (!found.bogus) { prepared.cache[key] = found; }
        }
        return {
            left: found.left, right: found.right,
            top: varHeight ? found.rtop : found.top,
            bottom: varHeight ? found.rbottom : found.bottom
        }
    }

    var nullRect = { left: 0, right: 0, top: 0, bottom: 0 };

    function nodeAndOffsetInLineMap(map, ch, bias) {
        var node, start, end, collapse, mStart, mEnd;
        // First, search the line map for the text node corresponding to,
        // or closest to, the target character.
        for (var i = 0; i < map.length; i += 3) {
            mStart = map[i];
            mEnd = map[i + 1];
            if (ch < mStart) {
                start = 0; end = 1;
                collapse = "left";
            } else if (ch < mEnd) {
                start = ch - mStart;
                end = start + 1;
            } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
                end = mEnd - mStart;
                start = end - 1;
                if (ch >= mEnd) { collapse = "right"; }
            }
            if (start != null) {
                node = map[i + 2];
                if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right")) { collapse = bias; }
                if (bias == "left" && start == 0) {
                    while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
                        node = map[(i -= 3) + 2];
                        collapse = "left";
                    }
                }
                if (bias == "right" && start == mEnd - mStart) {
                    while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
                        node = map[(i += 3) + 2];
                        collapse = "right";
                    }
                }
                break
            }
        }
        return { node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd }
    }

    function getUsefulRect(rects, bias) {
        var rect = nullRect;
        if (bias == "left") {
            for (var i = 0; i < rects.length; i++) {
                if ((rect = rects[i]).left != rect.right) { break }
            }
        } else {
            for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
                if ((rect = rects[i$1]).left != rect.right) { break }
            }
        }
        return rect
    }

    function measureCharInner(cm, prepared, ch, bias) {
        var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
        var node = place.node, start = place.start, end = place.end, collapse = place.collapse;

        var rect;
        if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
            for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
                while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }
                while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }
                if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) { rect = node.parentNode.getBoundingClientRect(); }
                else { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }
                if (rect.left || rect.right || start == 0) { break }
                end = start;
                start = start - 1;
                collapse = "right";
            }
            if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }
        } else { // If it is a widget, simply get the box for the whole widget.
            if (start > 0) { collapse = bias = "right"; }
            var rects;
            if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1) { rect = rects[bias == "right" ? rects.length - 1 : 0]; }
            else { rect = node.getBoundingClientRect(); }
        }
        if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
            var rSpan = node.parentNode.getClientRects()[0];
            if (rSpan) { rect = { left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom }; }
            else { rect = nullRect; }
        }

        var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
        var mid = (rtop + rbot) / 2;
        var heights = prepared.view.measure.heights;
        var i = 0;
        for (; i < heights.length - 1; i++) { if (mid < heights[i]) { break } }
        var top = i ? heights[i - 1] : 0, bot = heights[i];
        var result = {
            left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
            right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
            top: top, bottom: bot
        };
        if (!rect.left && !rect.right) { result.bogus = true; }
        if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }

        return result
    }

    // Work around problem with bounding client rects on ranges being
    // returned incorrectly when zoomed on IE10 and below.
    function maybeUpdateRectForZooming(measure, rect) {
        if (!window.screen || screen.logicalXDPI == null ||
            screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure)) { return rect }
        var scaleX = screen.logicalXDPI / screen.deviceXDPI;
        var scaleY = screen.logicalYDPI / screen.deviceYDPI;
        return {
            left: rect.left * scaleX, right: rect.right * scaleX,
            top: rect.top * scaleY, bottom: rect.bottom * scaleY
        }
    }

    function clearLineMeasurementCacheFor(lineView) {
        if (lineView.measure) {
            lineView.measure.cache = {};
            lineView.measure.heights = null;
            if (lineView.rest) {
                for (var i = 0; i < lineView.rest.length; i++) { lineView.measure.caches[i] = {}; }
            }
        }
    }

    function clearLineMeasurementCache(cm) {
        cm.display.externalMeasure = null;
        removeChildren(cm.display.lineMeasure);
        for (var i = 0; i < cm.display.view.length; i++) { clearLineMeasurementCacheFor(cm.display.view[i]); }
    }

    function clearCaches(cm) {
        clearLineMeasurementCache(cm);
        cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
        if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }
        cm.display.lineNumChars = null;
    }

    function pageScrollX(doc) {
        // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
        // which causes page_Offset and bounding client rects to use
        // different reference viewports and invalidate our calculations.
        if (chrome && android) { return -(doc.body.getBoundingClientRect().left - parseInt(getComputedStyle(doc.body).marginLeft)) }
        return doc.defaultView.pageXOffset || (doc.documentElement || doc.body).scrollLeft
    }
    function pageScrollY(doc) {
        if (chrome && android) { return -(doc.body.getBoundingClientRect().top - parseInt(getComputedStyle(doc.body).marginTop)) }
        return doc.defaultView.pageYOffset || (doc.documentElement || doc.body).scrollTop
    }

    function widgetTopHeight(lineObj) {
        var ref = visualLine(lineObj);
        var widgets = ref.widgets;
        var height = 0;
        if (widgets) {
            for (var i = 0; i < widgets.length; ++i) {
                if (widgets[i].above) { height += widgetHeight(widgets[i]); }
            }
        }
        return height
    }

    // Converts a {top, bottom, left, right} box from line-local
    // coordinates into another coordinate system. Context may be one of
    // "line", "div" (display.lineDiv), "local"./null (editor), "window",
    // or "page".
    function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
        if (!includeWidgets) {
            var height = widgetTopHeight(lineObj);
            rect.top += height; rect.bottom += height;
        }
        if (context == "line") { return rect }
        if (!context) { context = "local"; }
        var yOff = heightAtLine(lineObj);
        if (context == "local") { yOff += paddingTop(cm.display); }
        else { yOff -= cm.display.viewOffset; }
        if (context == "page" || context == "window") {
            var lOff = cm.display.lineSpace.getBoundingClientRect();
            yOff += lOff.top + (context == "window" ? 0 : pageScrollY(doc(cm)));
            var xOff = lOff.left + (context == "window" ? 0 : pageScrollX(doc(cm)));
            rect.left += xOff; rect.right += xOff;
        }
        rect.top += yOff; rect.bottom += yOff;
        return rect
    }

    // Coverts a box from "div" coords to another coordinate system.
    // Context may be "window", "page", "div", or "local"./null.
    function fromCoordSystem(cm, coords, context) {
        if (context == "div") { return coords }
        var left = coords.left, top = coords.top;
        // First move into "page" coordinate system
        if (context == "page") {
            left -= pageScrollX(doc(cm));
            top -= pageScrollY(doc(cm));
        } else if (context == "local" || !context) {
            var localBox = cm.display.sizer.getBoundingClientRect();
            left += localBox.left;
            top += localBox.top;
        }

        var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
        return { left: left - lineSpaceBox.left, top: top - lineSpaceBox.top }
    }

    function charCoords(cm, pos, context, lineObj, bias) {
        if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }
        return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
    }

    // Returns a box for a given cursor position, which may have an
    // 'other' property containing the position of the secondary cursor
    // on a bidi boundary.
    // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
    // and after `char - 1` in writing order of `char - 1`
    // A cursor Pos(line, char, "after") is on the same visual line as `char`
    // and before `char` in writing order of `char`
    // Examples (upper-case letters are RTL, lower-case are LTR):
    //     Pos(0, 1, ...)
    //     before   after
    // ab     a|b     a|b
    // aB     a|B     aB|
    // Ab     |Ab     A|b
    // AB     B|A     B|A
    // Every position after the last character on a line is considered to stick
    // to the last character on the line.
    function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
        lineObj = lineObj || getLine(cm.doc, pos.line);
        if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
        function get(ch, right) {
            var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
            if (right) { m.left = m.right; } else { m.right = m.left; }
            return intoCoordSystem(cm, lineObj, m, context)
        }
        var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;
        if (ch >= lineObj.text.length) {
            ch = lineObj.text.length;
            sticky = "before";
        } else if (ch <= 0) {
            ch = 0;
            sticky = "after";
        }
        if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }

        function getBidi(ch, partPos, invert) {
            var part = order[partPos], right = part.level == 1;
            return get(invert ? ch - 1 : ch, right != invert)
        }
        var partPos = getBidiPartAt(order, ch, sticky);
        var other = bidiOther;
        var val = getBidi(ch, partPos, sticky == "before");
        if (other != null) { val.other = getBidi(ch, other, sticky != "before"); }
        return val
    }

    // Used to cheaply estimate the coordinates for a position. Used for
    // intermediate scroll updates.
    function estimateCoords(cm, pos) {
        var left = 0;
        pos = clipPos(cm.doc, pos);
        if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }
        var lineObj = getLine(cm.doc, pos.line);
        var top = heightAtLine(lineObj) + paddingTop(cm.display);
        return { left: left, right: left, top: top, bottom: top + lineObj.height }
    }

    // Positions returned by coordsChar contain some extra information.
    // xRel is the relative x position of the input coordinates compared
    // to the found position (so xRel > 0 means the coordinates are to
    // the right of the character position, for example). When outside
    // is true, that means the coordinates lie outside the line's
    // vertical range.
    function PosWithInfo(line, ch, sticky, outside, xRel) {
        var pos = Pos(line, ch, sticky);
        pos.xRel = xRel;
        if (outside) { pos.outside = outside; }
        return pos
    }

    // Compute the character position closest to the given coordinates.
    // Input must be lineSpace-local ("div" coordinate system).
    function coordsChar(cm, x, y) {
        var doc = cm.doc;
        y += cm.display.viewOffset;
        if (y < 0) { return PosWithInfo(doc.first, 0, null, -1, -1) }
        var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
        if (lineN > last) { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1) }
        if (x < 0) { x = 0; }

        var lineObj = getLine(doc, lineN);
        for (; ;) {
            var found = coordsCharInner(cm, lineObj, lineN, x, y);
            var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0));
            if (!collapsed) { return found }
            var rangeEnd = collapsed.find(1);
            if (rangeEnd.line == lineN) { return rangeEnd }
            lineObj = getLine(doc, lineN = rangeEnd.line);
        }
    }

    function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
        y -= widgetTopHeight(lineObj);
        var end = lineObj.text.length;
        var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0);
        end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end);
        return { begin: begin, end: end }
    }

    function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
        if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
        var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
        return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
    }

    // Returns true if the given side of a box is after the given
    // coordinates, in top-to-bottom, left-to-right order.
    function boxIsAfter(box, x, y, left) {
        return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
    }

    function coordsCharInner(cm, lineObj, lineNo, x, y) {
        // Move y into line-local coordinate space
        y -= heightAtLine(lineObj);
        var preparedMeasure = prepareMeasureForLine(cm, lineObj);
        // When directly calling `measureCharPrepared`, we have to adjust
        // for the widgets at this line.
        var widgetHeight = widgetTopHeight(lineObj);
        var begin = 0, end = lineObj.text.length, ltr = true;

        var order = getOrder(lineObj, cm.doc.direction);
        // If the line isn't plain left-to-right text, first figure out
        // which bidi section the coordinates fall into.
        if (order) {
            var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
                (cm, lineObj, lineNo, preparedMeasure, order, x, y);
            ltr = part.level != 1;
            // The awkward -1 offsets are needed because findFirst (called
            // on these below) will treat its first bound as inclusive,
            // second as exclusive, but we want to actually address the
            // characters in the part's range
            begin = ltr ? part.from : part.to - 1;
            end = ltr ? part.to : part.from - 1;
        }

        // A binary search to find the first character whose bounding box
        // starts after the coordinates. If we run across any whose box wrap
        // the coordinates, store that.
        var chAround = null, boxAround = null;
        var ch = findFirst(function (ch) {
            var box = measureCharPrepared(cm, preparedMeasure, ch);
            box.top += widgetHeight; box.bottom += widgetHeight;
            if (!boxIsAfter(box, x, y, false)) { return false }
            if (box.top <= y && box.left <= x) {
                chAround = ch;
                boxAround = box;
            }
            return true
        }, begin, end);

        var baseX, sticky, outside = false;
        // If a box around the coordinates was found, use that
        if (boxAround) {
            // Distinguish coordinates nearer to the left or right side of the box
            var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;
            ch = chAround + (atStart ? 0 : 1);
            sticky = atStart ? "after" : "before";
            baseX = atLeft ? boxAround.left : boxAround.right;
        } else {
            // (Adjust for extended bound, if necessary.)
            if (!ltr && (ch == end || ch == begin)) { ch++; }
            // To determine which side to associate with, get the box to the
            // left of the character and compare it's vertical position to the
            // coordinates
            sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
                (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
                    "after" : "before";
            // Now get accurate coordinates for this place, in order to get a
            // base X position
            var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure);
            baseX = coords.left;
            outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;
        }

        ch = skipExtendingChars(lineObj.text, ch, 1);
        return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
    }

    function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
        // Bidi parts are sorted left-to-right, and in a non-line-wrapping
        // situation, we can take this ordering to correspond to the visual
        // ordering. This finds the first part whose end is after the given
        // coordinates.
        var index = findFirst(function (i) {
            var part = order[i], ltr = part.level != 1;
            return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
                "line", lineObj, preparedMeasure), x, y, true)
        }, 0, order.length - 1);
        var part = order[index];
        // If this isn't the first part, the part's start is also after
        // the coordinates, and the coordinates aren't on the same line as
        // that start, move one part back.
        if (index > 0) {
            var ltr = part.level != 1;
            var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
                "line", lineObj, preparedMeasure);
            if (boxIsAfter(start, x, y, true) && start.top > y) { part = order[index - 1]; }
        }
        return part
    }

    function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
        // In a wrapped line, rtl text on wrapping boundaries can do things
        // that don't correspond to the ordering in our `order` array at
        // all, so a binary search doesn't work, and we want to return a
        // part that only spans one line so that the binary search in
        // coordsCharInner is safe. As such, we first find the extent of the
        // wrapped line, and then do a flat search in which we discard any
        // spans that aren't on the line.
        var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
        var begin = ref.begin;
        var end = ref.end;
        if (/\s/.test(lineObj.text.charAt(end - 1))) { end--; }
        var part = null, closestDist = null;
        for (var i = 0; i < order.length; i++) {
            var p = order[i];
            if (p.from >= end || p.to <= begin) { continue }
            var ltr = p.level != 1;
            var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
            // Weigh against spans ending before this, so that they are only
            // picked if nothing ends after
            var dist = endX < x ? x - endX + 1e9 : endX - x;
            if (!part || closestDist > dist) {
                part = p;
                closestDist = dist;
            }
        }
        if (!part) { part = order[order.length - 1]; }
        // Clip the part to the wrapped line.
        if (part.from < begin) { part = { from: begin, to: part.to, level: part.level }; }
        if (part.to > end) { part = { from: part.from, to: end, level: part.level }; }
        return part
    }

    var measureText;
    // Compute the default text height.
    function textHeight(display) {
        if (display.cachedTextHeight != null) { return display.cachedTextHeight }
        if (measureText == null) {
            measureText = elt("pre", null, "CodeMirror-line-like");
            // Measure a bunch of lines, for browsers that compute
            // fractional heights.
            for (var i = 0; i < 49; ++i) {
                measureText.appendChild(document.createTextNode("x"));
                measureText.appendChild(elt("br"));
            }
            measureText.appendChild(document.createTextNode("x"));
        }
        removeChildrenAndAdd(display.measure, measureText);
        var height = measureText.offsetHeight / 50;
        if (height > 3) { display.cachedTextHeight = height; }
        removeChildren(display.measure);
        return height || 1
    }

    // Compute the default character width.
    function charWidth(display) {
        if (display.cachedCharWidth != null) { return display.cachedCharWidth }
        var anchor = elt("span", "xxxxxxxxxx");
        var pre = elt("pre", [anchor], "CodeMirror-line-like");
        removeChildrenAndAdd(display.measure, pre);
        var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
        if (width > 2) { display.cachedCharWidth = width; }
        return width || 10
    }

    // Do a bulk-read of the DOM positions and sizes needed to draw the
    // view, so that we don't interleave reading and writing to the DOM.
    function getDimensions(cm) {
        var d = cm.display, left = {}, width = {};
        var gutterLeft = d.gutters.clientLeft;
        for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
            var id = cm.display.gutterSpecs[i].className;
            left[id] = n.offsetLeft + n.clientLeft + gutterLeft;
            width[id] = n.clientWidth;
        }
        return {
            fixedPos: compensateForHScroll(d),
            gutterTotalWidth: d.gutters.offsetWidth,
            gutterLeft: left,
            gutterWidth: width,
            wrapperWidth: d.wrapper.clientWidth
        }
    }

    // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
    // but using getBoundingClientRect to get a sub-pixel-accurate
    // result.
    function compensateForHScroll(display) {
        return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
    }

    // Returns a function that estimates the height of a line, to use as
    // first approximation until the line becomes visible (and is thus
    // properly measurable).
    function estimateHeight(cm) {
        var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
        var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
        return function (line) {
            if (lineIsHidden(cm.doc, line)) { return 0 }

            var widgetsHeight = 0;
            if (line.widgets) {
                for (var i = 0; i < line.widgets.length; i++) {
                    if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }
                }
            }

            if (wrapping) { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
            else { return widgetsHeight + th }
        }
    }

    function estimateLineHeights(cm) {
        var doc = cm.doc, est = estimateHeight(cm);
        doc.iter(function (line) {
            var estHeight = est(line);
            if (estHeight != line.height) { updateLineHeight(line, estHeight); }
        });
    }

    // Given a mouse event, find the corresponding position. If liberal
    // is false, it checks whether a gutter or scrollbar was clicked,
    // and returns null if it was. forRect is used by rectangular
    // selections, and tries to estimate a character position even for
    // coordinates beyond the right of the text.
    function posFromMouse(cm, e, liberal, forRect) {
        var display = cm.display;
        if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }

        var x, y, space = display.lineSpace.getBoundingClientRect();
        // Fails unpredictably on IE[67] when mouse is dragged around quickly.
        try { x = e.clientX - space.left; y = e.clientY - space.top; }
        catch (e$1) { return null }
        var coords = coordsChar(cm, x, y), line;
        if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
            var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
            coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
        }
        return coords
    }

    // Find the view element corresponding to a given line. Return null
    // when the line isn't visible.
    function findViewIndex(cm, n) {
        if (n >= cm.display.viewTo) { return null }
        n -= cm.display.viewFrom;
        if (n < 0) { return null }
        var view = cm.display.view;
        for (var i = 0; i < view.length; i++) {
            n -= view[i].size;
            if (n < 0) { return i }
        }
    }

    // Updates the display.view data structure for a given change to the
    // document. From and to are in pre-change coordinates. Lendiff is
    // the amount of lines added or subtracted by the change. This is
    // used for changes that span multiple lines, or change the way
    // lines are divided into visual lines. regLineChange (below)
    // registers single-line changes.
    function regChange(cm, from, to, lendiff) {
        if (from == null) { from = cm.doc.first; }
        if (to == null) { to = cm.doc.first + cm.doc.size; }
        if (!lendiff) { lendiff = 0; }

        var display = cm.display;
        if (lendiff && to < display.viewTo &&
            (display.updateLineNumbers == null || display.updateLineNumbers > from)) { display.updateLineNumbers = from; }

        cm.curOp.viewChanged = true;

        if (from >= display.viewTo) { // Change after
            if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo) { resetView(cm); }
        } else if (to <= display.viewFrom) { // Change before
            if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
                resetView(cm);
            } else {
                display.viewFrom += lendiff;
                display.viewTo += lendiff;
            }
        } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
            resetView(cm);
        } else if (from <= display.viewFrom) { // Top overlap
            var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
            if (cut) {
                display.view = display.view.slice(cut.index);
                display.viewFrom = cut.lineN;
                display.viewTo += lendiff;
            } else {
                resetView(cm);
            }
        } else if (to >= display.viewTo) { // Bottom overlap
            var cut$1 = viewCuttingPoint(cm, from, from, -1);
            if (cut$1) {
                display.view = display.view.slice(0, cut$1.index);
                display.viewTo = cut$1.lineN;
            } else {
                resetView(cm);
            }
        } else { // Gap in the middle
            var cutTop = viewCuttingPoint(cm, from, from, -1);
            var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
            if (cutTop && cutBot) {
                display.view = display.view.slice(0, cutTop.index)
                    .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
                    .concat(display.view.slice(cutBot.index));
                display.viewTo += lendiff;
            } else {
                resetView(cm);
            }
        }

        var ext = display.externalMeasured;
        if (ext) {
            if (to < ext.lineN) { ext.lineN += lendiff; }
            else if (from < ext.lineN + ext.size) { display.externalMeasured = null; }
        }
    }

    // Register a change to a single line. Type must be one of "text",
    // "gutter", "class", "widget"
    function regLineChange(cm, line, type) {
        cm.curOp.viewChanged = true;
        var display = cm.display, ext = cm.display.externalMeasured;
        if (ext && line >= ext.lineN && line < ext.lineN + ext.size) { display.externalMeasured = null; }

        if (line < display.viewFrom || line >= display.viewTo) { return }
        var lineView = display.view[findViewIndex(cm, line)];
        if (lineView.node == null) { return }
        var arr = lineView.changes || (lineView.changes = []);
        if (indexOf(arr, type) == -1) { arr.push(type); }
    }

    // Clear the view.
    function resetView(cm) {
        cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
        cm.display.view = [];
        cm.display.viewOffset = 0;
    }

    function viewCuttingPoint(cm, oldN, newN, dir) {
        var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
        if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size) { return { index: index, lineN: newN } }
        var n = cm.display.viewFrom;
        for (var i = 0; i < index; i++) { n += view[i].size; }
        if (n != oldN) {
            if (dir > 0) {
                if (index == view.length - 1) { return null }
                diff = (n + view[index].size) - oldN;
                index++;
            } else {
                diff = n - oldN;
            }
            oldN += diff; newN += diff;
        }
        while (visualLineNo(cm.doc, newN) != newN) {
            if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
            newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
            index += dir;
        }
        return { index: index, lineN: newN }
    }

    // Force the view to cover a given range, adding empty view element
    // or clipping off existing ones as needed.
    function adjustView(cm, from, to) {
        var display = cm.display, view = display.view;
        if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
            display.view = buildViewArray(cm, from, to);
            display.viewFrom = from;
        } else {
            if (display.viewFrom > from) { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }
            else if (display.viewFrom < from) { display.view = display.view.slice(findViewIndex(cm, from)); }
            display.viewFrom = from;
            if (display.viewTo < to) { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }
            else if (display.viewTo > to) { display.view = display.view.slice(0, findViewIndex(cm, to)); }
        }
        display.viewTo = to;
    }

    // Count the number of lines in the view whose DOM representation is
    // out of date (or nonexistent).
    function countDirtyView(cm) {
        var view = cm.display.view, dirty = 0;
        for (var i = 0; i < view.length; i++) {
            var lineView = view[i];
            if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }
        }
        return dirty
    }

    function updateSelection(cm) {
        cm.display.input.showSelection(cm.display.input.prepareSelection());
    }

    function prepareSelection(cm, primary) {
        if (primary === void 0) primary = true;

        var doc = cm.doc, result = {};
        var curFragment = result.cursors = document.createDocumentFragment();
        var selFragment = result.selection = document.createDocumentFragment();

        var customCursor = cm.options.$customCursor;
        if (customCursor) { primary = true; }
        for (var i = 0; i < doc.sel.ranges.length; i++) {
            if (!primary && i == doc.sel.primIndex) { continue }
            var range = doc.sel.ranges[i];
            if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }
            var collapsed = range.empty();
            if (customCursor) {
                var head = customCursor(cm, range);
                if (head) { drawSelectionCursor(cm, head, curFragment); }
            } else if (collapsed || cm.options.showCursorWhenSelecting) {
                drawSelectionCursor(cm, range.head, curFragment);
            }
            if (!collapsed) { drawSelectionRange(cm, range, selFragment); }
        }
        return result
    }

    // Draws a cursor for the given range
    function drawSelectionCursor(cm, head, output) {
        var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

        var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
        cursor.style.left = pos.left + "px";
        cursor.style.top = pos.top + "px";
        cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

        if (/\bcm-fat-cursor\b/.test(cm.getWrapperElement().className)) {
            var charPos = charCoords(cm, head, "div", null, null);
            var width = charPos.right - charPos.left;
            cursor.style.width = (width > 0 ? width : cm.defaultCharWidth()) + "px";
        }

        if (pos.other) {
            // Secondary cursor, shown when on a 'jump' in bi-directional text
            var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
            otherCursor.style.display = "";
            otherCursor.style.left = pos.other.left + "px";
            otherCursor.style.top = pos.other.top + "px";
            otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
        }
    }

    function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }

    // Draws the given range as a highlighted selection
    function drawSelectionRange(cm, range, output) {
        var display = cm.display, doc = cm.doc;
        var fragment = document.createDocumentFragment();
        var padding = paddingH(cm.display), leftSide = padding.left;
        var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
        var docLTR = doc.direction == "ltr";

        function add(left, top, width, bottom) {
            if (top < 0) { top = 0; }
            top = Math.round(top);
            bottom = Math.round(bottom);
            fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
        }

        function drawForLine(line, fromArg, toArg) {
            var lineObj = getLine(doc, line);
            var lineLen = lineObj.text.length;
            var start, end;
            function coords(ch, bias) {
                return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
            }

            function wrapX(pos, dir, side) {
                var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
                var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
                var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
                return coords(ch, prop)[prop]
            }

            var order = getOrder(lineObj, doc.direction);
            iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {
                var ltr = dir == "ltr";
                var fromPos = coords(from, ltr ? "left" : "right");
                var toPos = coords(to - 1, ltr ? "right" : "left");

                var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;
                var first = i == 0, last = !order || i == order.length - 1;
                if (toPos.top - fromPos.top <= 3) { // Single line
                    var openLeft = (docLTR ? openStart : openEnd) && first;
                    var openRight = (docLTR ? openEnd : openStart) && last;
                    var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
                    var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
                    add(left, fromPos.top, right - left, fromPos.bottom);
                } else { // Multiple lines
                    var topLeft, topRight, botLeft, botRight;
                    if (ltr) {
                        topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
                        topRight = docLTR ? rightSide : wrapX(from, dir, "before");
                        botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
                        botRight = docLTR && openEnd && last ? rightSide : toPos.right;
                    } else {
                        topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
                        topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
                        botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
                        botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
                    }
                    add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
                    if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top); }
                    add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
                }

                if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos; }
                if (cmpCoords(toPos, start) < 0) { start = toPos; }
                if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos; }
                if (cmpCoords(toPos, end) < 0) { end = toPos; }
            });
            return { start: start, end: end }
        }

        var sFrom = range.from(), sTo = range.to();
        if (sFrom.line == sTo.line) {
            drawForLine(sFrom.line, sFrom.ch, sTo.ch);
        } else {
            var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
            var singleVLine = visualLine(fromLine) == visualLine(toLine);
            var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
            var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
            if (singleVLine) {
                if (leftEnd.top < rightStart.top - 2) {
                    add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
                    add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
                } else {
                    add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
                }
            }
            if (leftEnd.bottom < rightStart.top) { add(leftSide, leftEnd.bottom, null, rightStart.top); }
        }

        output.appendChild(fragment);
    }

    // Cursor-blinking
    function restartBlink(cm) {
        if (!cm.state.focused) { return }
        var display = cm.display;
        clearInterval(display.blinker);
        var on = true;
        display.cursorDiv.style.visibility = "";
        if (cm.options.cursorBlinkRate > 0) {
            display.blinker = setInterval(function () {
                if (!cm.hasFocus()) { onBlur(cm); }
                display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
            }, cm.options.cursorBlinkRate);
        }
        else if (cm.options.cursorBlinkRate < 0) { display.cursorDiv.style.visibility = "hidden"; }
    }

    function ensureFocus(cm) {
        if (!cm.hasFocus()) {
            cm.display.input.focus();
            if (!cm.state.focused) { onFocus(cm); }
        }
    }

    function delayBlurEvent(cm) {
        cm.state.delayingBlurEvent = true;
        setTimeout(function () {
            if (cm.state.delayingBlurEvent) {
                cm.state.delayingBlurEvent = false;
                if (cm.state.focused) { onBlur(cm); }
            }
        }, 100);
    }

    function onFocus(cm, e) {
        if (cm.state.delayingBlurEvent && !cm.state.draggingText) { cm.state.delayingBlurEvent = false; }

        if (cm.options.readOnly == "nocursor") { return }
        if (!cm.state.focused) {
            signal(cm, "focus", cm, e);
            cm.state.focused = true;
            addClass(cm.display.wrapper, "CodeMirror-focused");
            // This test prevents this from firing when a context
            // menu is closed (since the input reset would kill the
            // select-all detection hack)
            if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
                cm.display.input.reset();
                if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730
            }
            cm.display.input.receivedFocus();
        }
        restartBlink(cm);
    }
    function onBlur(cm, e) {
        if (cm.state.delayingBlurEvent) { return }

        if (cm.state.focused) {
            signal(cm, "blur", cm, e);
            cm.state.focused = false;
            rmClass(cm.display.wrapper, "CodeMirror-focused");
        }
        clearInterval(cm.display.blinker);
        setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);
    }

    // Read the actual heights of the rendered lines, and update their
    // stored heights to match.
    function updateHeightsInViewport(cm) {
        var display = cm.display;
        var prevBottom = display.lineDiv.offsetTop;
        var viewTop = Math.max(0, display.scroller.getBoundingClientRect().top);
        var oldHeight = display.lineDiv.getBoundingClientRect().top;
        var mustScroll = 0;
        for (var i = 0; i < display.view.length; i++) {
            var cur = display.view[i], wrapping = cm.options.lineWrapping;
            var height = (void 0), width = 0;
            if (cur.hidden) { continue }
            oldHeight += cur.line.height;
            if (ie && ie_version < 8) {
                var bot = cur.node.offsetTop + cur.node.offsetHeight;
                height = bot - prevBottom;
                prevBottom = bot;
            } else {
                var box = cur.node.getBoundingClientRect();
                height = box.bottom - box.top;
                // Check that lines don't extend past the right of the current
                // editor width
                if (!wrapping && cur.text.firstChild) { width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1; }
            }
            var diff = cur.line.height - height;
            if (diff > .005 || diff < -.005) {
                if (oldHeight < viewTop) { mustScroll -= diff; }
                updateLineHeight(cur.line, height);
                updateWidgetHeight(cur.line);
                if (cur.rest) {
                    for (var j = 0; j < cur.rest.length; j++) { updateWidgetHeight(cur.rest[j]); }
                }
            }
            if (width > cm.display.sizerWidth) {
                var chWidth = Math.ceil(width / charWidth(cm.display));
                if (chWidth > cm.display.maxLineLength) {
                    cm.display.maxLineLength = chWidth;
                    cm.display.maxLine = cur.line;
                    cm.display.maxLineChanged = true;
                }
            }
        }
        if (Math.abs(mustScroll) > 2) { display.scroller.scrollTop += mustScroll; }
    }

    // Read and store the height of line widgets associated with the
    // given line.
    function updateWidgetHeight(line) {
        if (line.widgets) {
            for (var i = 0; i < line.widgets.length; ++i) {
                var w = line.widgets[i], parent = w.node.parentNode;
                if (parent) { w.height = parent.offsetHeight; }
            }
        }
    }

    // Compute the lines that are visible in a given viewport (defaults
    // the the current scroll position). viewport may contain top,
    // height, and ensure (see op.scrollToPos) properties.
    function visibleLines(display, doc, viewport) {
        var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
        top = Math.floor(top - paddingTop(display));
        var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

        var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
        // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
        // forces those lines into the viewport (if possible).
        if (viewport && viewport.ensure) {
            var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
            if (ensureFrom < from) {
                from = ensureFrom;
                to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
            } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
                from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
                to = ensureTo;
            }
        }
        return { from: from, to: Math.max(to, from + 1) }
    }

    // SCROLLING THINGS INTO VIEW

    // If an editor sits on the top or bottom of the window, partially
    // scrolled out of view, this ensures that the cursor is visible.
    function maybeScrollWindow(cm, rect) {
        if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }

        var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
        var doc = display.wrapper.ownerDocument;
        if (rect.top + box.top < 0) { doScroll = true; }
        else if (rect.bottom + box.top > (doc.defaultView.innerHeight || doc.documentElement.clientHeight)) { doScroll = false; }
        if (doScroll != null && !phantom) {
            var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
            cm.display.lineSpace.appendChild(scrollNode);
            scrollNode.scrollIntoView(doScroll);
            cm.display.lineSpace.removeChild(scrollNode);
        }
    }

    // Scroll a given position into view (immediately), verifying that
    // it actually became visible (as line heights are accurately
    // measured, the position of something may 'drift' during drawing).
    function scrollPosIntoView(cm, pos, end, margin) {
        if (margin == null) { margin = 0; }
        var rect;
        if (!cm.options.lineWrapping && pos == end) {
            // Set pos and end to the cursor positions around the character pos sticks to
            // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
            // If pos == Pos(_, 0, "before"), pos and end are unchanged
            end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
            pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
        }
        for (var limit = 0; limit < 5; limit++) {
            var changed = false;
            var coords = cursorCoords(cm, pos);
            var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
            rect = {
                left: Math.min(coords.left, endCoords.left),
                top: Math.min(coords.top, endCoords.top) - margin,
                right: Math.max(coords.left, endCoords.left),
                bottom: Math.max(coords.bottom, endCoords.bottom) + margin
            };
            var scrollPos = calculateScrollPos(cm, rect);
            var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
            if (scrollPos.scrollTop != null) {
                updateScrollTop(cm, scrollPos.scrollTop);
                if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }
            }
            if (scrollPos.scrollLeft != null) {
                setScrollLeft(cm, scrollPos.scrollLeft);
                if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }
            }
            if (!changed) { break }
        }
        return rect
    }

    // Scroll a given set of coordinates into view (immediately).
    function scrollIntoView(cm, rect) {
        var scrollPos = calculateScrollPos(cm, rect);
        if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }
        if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }
    }

    // Calculate a new scroll position needed to scroll the given
    // rectangle into view. Returns an object with scrollTop and
    // scrollLeft properties. When these are undefined, the
    // vertical/horizontal position does not need to be adjusted.
    function calculateScrollPos(cm, rect) {
        var display = cm.display, snapMargin = textHeight(cm.display);
        if (rect.top < 0) { rect.top = 0; }
        var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
        var screen = displayHeight(cm), result = {};
        if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }
        var docBottom = cm.doc.height + paddingVert(display);
        var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;
        if (rect.top < screentop) {
            result.scrollTop = atTop ? 0 : rect.top;
        } else if (rect.bottom > screentop + screen) {
            var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
            if (newTop != screentop) { result.scrollTop = newTop; }
        }

        var gutterSpace = cm.options.fixedGutter ? 0 : display.gutters.offsetWidth;
        var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft - gutterSpace;
        var screenw = displayWidth(cm) - display.gutters.offsetWidth;
        var tooWide = rect.right - rect.left > screenw;
        if (tooWide) { rect.right = rect.left + screenw; }
        if (rect.left < 10) { result.scrollLeft = 0; }
        else if (rect.left < screenleft) { result.scrollLeft = Math.max(0, rect.left + gutterSpace - (tooWide ? 0 : 10)); }
        else if (rect.right > screenw + screenleft - 3) { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }
        return result
    }

    // Store a relative adjustment to the scroll position in the current
    // operation (to be applied when the operation finishes).
    function addToScrollTop(cm, top) {
        if (top == null) { return }
        resolveScrollToPos(cm);
        cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
    }

    // Make sure that at the end of the operation the current cursor is
    // shown.
    function ensureCursorVisible(cm) {
        resolveScrollToPos(cm);
        var cur = cm.getCursor();
        cm.curOp.scrollToPos = { from: cur, to: cur, margin: cm.options.cursorScrollMargin };
    }

    function scrollToCoords(cm, x, y) {
        if (x != null || y != null) { resolveScrollToPos(cm); }
        if (x != null) { cm.curOp.scrollLeft = x; }
        if (y != null) { cm.curOp.scrollTop = y; }
    }

    function scrollToRange(cm, range) {
        resolveScrollToPos(cm);
        cm.curOp.scrollToPos = range;
    }

    // When an operation has its scrollToPos property set, and another
    // scroll action is applied before the end of the operation, this
    // 'simulates' scrolling that position into view in a cheap way, so
    // that the effect of intermediate scroll commands is not ignored.
    function resolveScrollToPos(cm) {
        var range = cm.curOp.scrollToPos;
        if (range) {
            cm.curOp.scrollToPos = null;
            var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
            scrollToCoordsRange(cm, from, to, range.margin);
        }
    }

    function scrollToCoordsRange(cm, from, to, margin) {
        var sPos = calculateScrollPos(cm, {
            left: Math.min(from.left, to.left),
            top: Math.min(from.top, to.top) - margin,
            right: Math.max(from.right, to.right),
            bottom: Math.max(from.bottom, to.bottom) + margin
        });
        scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
    }

    // Sync the scrollable area and scrollbars, ensure the viewport
    // covers the visible area.
    function updateScrollTop(cm, val) {
        if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
        if (!gecko) { updateDisplaySimple(cm, { top: val }); }
        setScrollTop(cm, val, true);
        if (gecko) { updateDisplaySimple(cm); }
        startWorker(cm, 100);
    }

    function setScrollTop(cm, val, forceScroll) {
        val = Math.max(0, Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val));
        if (cm.display.scroller.scrollTop == val && !forceScroll) { return }
        cm.doc.scrollTop = val;
        cm.display.scrollbars.setScrollTop(val);
        if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }
    }

    // Sync scroller and scrollbar, ensure the gutter elements are
    // aligned.
    function setScrollLeft(cm, val, isScroller, forceScroll) {
        val = Math.max(0, Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth));
        if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }
        cm.doc.scrollLeft = val;
        alignHorizontally(cm);
        if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }
        cm.display.scrollbars.setScrollLeft(val);
    }

    // SCROLLBARS

    // Prepare DOM reads needed to update the scrollbars. Done in one
    // shot to minimize update/measure roundtrips.
    function measureForScrollbars(cm) {
        var d = cm.display, gutterW = d.gutters.offsetWidth;
        var docH = Math.round(cm.doc.height + paddingVert(cm.display));
        return {
            clientHeight: d.scroller.clientHeight,
            viewHeight: d.wrapper.clientHeight,
            scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
            viewWidth: d.wrapper.clientWidth,
            barLeft: cm.options.fixedGutter ? gutterW : 0,
            docHeight: docH,
            scrollHeight: docH + scrollGap(cm) + d.barHeight,
            nativeBarWidth: d.nativeBarWidth,
            gutterWidth: gutterW
        }
    }

    var NativeScrollbars = function (place, scroll, cm) {
        this.cm = cm;
        var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
        var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
        vert.tabIndex = horiz.tabIndex = -1;
        place(vert); place(horiz);

        on(vert, "scroll", function () {
            if (vert.clientHeight) { scroll(vert.scrollTop, "vertical"); }
        });
        on(horiz, "scroll", function () {
            if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal"); }
        });

        this.checkedZeroWidth = false;
        // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
        if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px"; }
    };

    NativeScrollbars.prototype.update = function (measure) {
        var needsH = measure.scrollWidth > measure.clientWidth + 1;
        var needsV = measure.scrollHeight > measure.clientHeight + 1;
        var sWidth = measure.nativeBarWidth;

        if (needsV) {
            this.vert.style.display = "block";
            this.vert.style.bottom = needsH ? sWidth + "px" : "0";
            var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
            // A bug in IE8 can cause this value to be negative, so guard it.
            this.vert.firstChild.style.height =
                Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
        } else {
            this.vert.scrollTop = 0;
            this.vert.style.display = "";
            this.vert.firstChild.style.height = "0";
        }

        if (needsH) {
            this.horiz.style.display = "block";
            this.horiz.style.right = needsV ? sWidth + "px" : "0";
            this.horiz.style.left = measure.barLeft + "px";
            var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
            this.horiz.firstChild.style.width =
                Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
        } else {
            this.horiz.style.display = "";
            this.horiz.firstChild.style.width = "0";
        }

        if (!this.checkedZeroWidth && measure.clientHeight > 0) {
            if (sWidth == 0) { this.zeroWidthHack(); }
            this.checkedZeroWidth = true;
        }

        return { right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0 }
    };

    NativeScrollbars.prototype.setScrollLeft = function (pos) {
        if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }
        if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz"); }
    };

    NativeScrollbars.prototype.setScrollTop = function (pos) {
        if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }
        if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert"); }
    };

    NativeScrollbars.prototype.zeroWidthHack = function () {
        var w = mac && !mac_geMountainLion ? "12px" : "18px";
        this.horiz.style.height = this.vert.style.width = w;
        this.horiz.style.visibility = this.vert.style.visibility = "hidden";
        this.disableHoriz = new Delayed;
        this.disableVert = new Delayed;
    };

    NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
        bar.style.visibility = "";
        function maybeDisable() {
            // To find out whether the scrollbar is still visible, we
            // check whether the element under the pixel in the bottom
            // right corner of the scrollbar box is the scrollbar box
            // itself (when the bar is still visible) or its filler child
            // (when the bar is hidden). If it is still visible, we keep
            // it enabled, if it's hidden, we disable pointer events.
            var box = bar.getBoundingClientRect();
            var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
                : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
            if (elt != bar) { bar.style.visibility = "hidden"; }
            else { delay.set(1000, maybeDisable); }
        }
        delay.set(1000, maybeDisable);
    };

    NativeScrollbars.prototype.clear = function () {
        var parent = this.horiz.parentNode;
        parent.removeChild(this.horiz);
        parent.removeChild(this.vert);
    };

    var NullScrollbars = function () { };

    NullScrollbars.prototype.update = function () { return { bottom: 0, right: 0 } };
    NullScrollbars.prototype.setScrollLeft = function () { };
    NullScrollbars.prototype.setScrollTop = function () { };
    NullScrollbars.prototype.clear = function () { };

    function updateScrollbars(cm, measure) {
        if (!measure) { measure = measureForScrollbars(cm); }
        var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
        updateScrollbarsInner(cm, measure);
        for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
            if (startWidth != cm.display.barWidth && cm.options.lineWrapping) { updateHeightsInViewport(cm); }
            updateScrollbarsInner(cm, measureForScrollbars(cm));
            startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
        }
    }

    // Re-synchronize the fake scrollbars with the actual size of the
    // content.
    function updateScrollbarsInner(cm, measure) {
        var d = cm.display;
        var sizes = d.scrollbars.update(measure);

        d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
        d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
        d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

        if (sizes.right && sizes.bottom) {
            d.scrollbarFiller.style.display = "block";
            d.scrollbarFiller.style.height = sizes.bottom + "px";
            d.scrollbarFiller.style.width = sizes.right + "px";
        } else { d.scrollbarFiller.style.display = ""; }
        if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
            d.gutterFiller.style.display = "block";
            d.gutterFiller.style.height = sizes.bottom + "px";
            d.gutterFiller.style.width = measure.gutterWidth + "px";
        } else { d.gutterFiller.style.display = ""; }
    }

    var scrollbarModel = { "native": NativeScrollbars, "null": NullScrollbars };

    function initScrollbars(cm) {
        if (cm.display.scrollbars) {
            cm.display.scrollbars.clear();
            if (cm.display.scrollbars.addClass) { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
        }

        cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
            cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
            // Prevent clicks in the scrollbars from killing focus
            on(node, "mousedown", function () {
                if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }
            });
            node.setAttribute("cm-not-content", "true");
        }, function (pos, axis) {
            if (axis == "horizontal") { setScrollLeft(cm, pos); }
            else { updateScrollTop(cm, pos); }
        }, cm);
        if (cm.display.scrollbars.addClass) { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
    }

    // Operations are used to wrap a series of changes to the editor
    // state in such a way that each change won't have to update the
    // cursor and display (which would be awkward, slow, and
    // error-prone). Instead, display updates are batched and then all
    // combined and executed at once.

    var nextOpId = 0;
    // Start a new operation.
    function startOperation(cm) {
        cm.curOp = {
            cm: cm,
            viewChanged: false,      // Flag that indicates that lines might need to be redrawn
            startHeight: cm.doc.height, // Used to detect need to update scrollbar
            forceUpdate: false,      // Used to force a redraw
            updateInput: 0,       // Whether to reset the input textarea
            typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
            changeObjs: null,        // Accumulated changes, for firing change events
            cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
            cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
            selectionChanged: false, // Whether the selection needs to be redrawn
            updateMaxLine: false,    // Set when the widest line needs to be determined anew
            scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
            scrollToPos: null,       // Used to scroll to a specific position
            focus: false,
            id: ++nextOpId,          // Unique ID
            markArrays: null         // Used by addMarkedSpan
        };
        pushOperation(cm.curOp);
    }

    // Finish an operation, updating the display and signalling delayed events
    function endOperation(cm) {
        var op = cm.curOp;
        if (op) {
            finishOperation(op, function (group) {
                for (var i = 0; i < group.ops.length; i++) { group.ops[i].cm.curOp = null; }
                endOperations(group);
            });
        }
    }

    // The DOM updates done when an operation finishes are batched so
    // that the minimum number of relayouts are required.
    function endOperations(group) {
        var ops = group.ops;
        for (var i = 0; i < ops.length; i++) // Read DOM
        { endOperation_R1(ops[i]); }
        for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
        { endOperation_W1(ops[i$1]); }
        for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
        { endOperation_R2(ops[i$2]); }
        for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
        { endOperation_W2(ops[i$3]); }
        for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
        { endOperation_finish(ops[i$4]); }
    }

    function endOperation_R1(op) {
        var cm = op.cm, display = cm.display;
        maybeClipScrollbars(cm);
        if (op.updateMaxLine) { findMaxLine(cm); }

        op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
            op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
                op.scrollToPos.to.line >= display.viewTo) ||
            display.maxLineChanged && cm.options.lineWrapping;
        op.update = op.mustUpdate &&
            new DisplayUpdate(cm, op.mustUpdate && { top: op.scrollTop, ensure: op.scrollToPos }, op.forceUpdate);
    }

    function endOperation_W1(op) {
        op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
    }

    function endOperation_R2(op) {
        var cm = op.cm, display = cm.display;
        if (op.updatedDisplay) { updateHeightsInViewport(cm); }

        op.barMeasure = measureForScrollbars(cm);

        // If the max line changed since it was last measured, measure it,
        // and ensure the document's width matches it.
        // updateDisplay_W2 will use these properties to do the actual resizing
        if (display.maxLineChanged && !cm.options.lineWrapping) {
            op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
            cm.display.sizerWidth = op.adjustWidthTo;
            op.barMeasure.scrollWidth =
                Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
            op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
        }

        if (op.updatedDisplay || op.selectionChanged) { op.preparedSelection = display.input.prepareSelection(); }
    }

    function endOperation_W2(op) {
        var cm = op.cm;

        if (op.adjustWidthTo != null) {
            cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
            if (op.maxScrollLeft < cm.doc.scrollLeft) { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }
            cm.display.maxLineChanged = false;
        }

        var takeFocus = op.focus && op.focus == activeElt(doc(cm));
        if (op.preparedSelection) { cm.display.input.showSelection(op.preparedSelection, takeFocus); }
        if (op.updatedDisplay || op.startHeight != cm.doc.height) { updateScrollbars(cm, op.barMeasure); }
        if (op.updatedDisplay) { setDocumentHeight(cm, op.barMeasure); }

        if (op.selectionChanged) { restartBlink(cm); }

        if (cm.state.focused && op.updateInput) { cm.display.input.reset(op.typing); }
        if (takeFocus) { ensureFocus(op.cm); }
    }

    function endOperation_finish(op) {
        var cm = op.cm, display = cm.display, doc = cm.doc;

        if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }

        // Abort mouse wheel delta measurement, when scrolling explicitly
        if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos)) { display.wheelStartX = display.wheelStartY = null; }

        // Propagate the scroll position to the actual DOM scroller
        if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }

        if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }
        // If we need to scroll a specific position into view, do so.
        if (op.scrollToPos) {
            var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
                clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
            maybeScrollWindow(cm, rect);
        }

        // Fire events for markers that are hidden/unidden by editing or
        // undoing
        var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
        if (hidden) {
            for (var i = 0; i < hidden.length; ++i) { if (!hidden[i].lines.length) { signal(hidden[i], "hide"); } }
        }
        if (unhidden) {
            for (var i$1 = 0; i$1 < unhidden.length; ++i$1) { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide"); } }
        }

        if (display.wrapper.offsetHeight) { doc.scrollTop = cm.display.scroller.scrollTop; }

        // Fire change events, and delayed event handlers
        if (op.changeObjs) { signal(cm, "changes", cm, op.changeObjs); }
        if (op.update) { op.update.finish(); }
    }

    // Run the given function in an operation
    function runInOp(cm, f) {
        if (cm.curOp) { return f() }
        startOperation(cm);
        try { return f() }
        finally { endOperation(cm); }
    }
    // Wraps a function in an operation. Returns the wrapped function.
    function operation(cm, f) {
        return function () {
            if (cm.curOp) { return f.apply(cm, arguments) }
            startOperation(cm);
            try { return f.apply(cm, arguments) }
            finally { endOperation(cm); }
        }
    }
    // Used to add methods to editor and doc instances, wrapping them in
    // operations.
    function methodOp(f) {
        return function () {
            if (this.curOp) { return f.apply(this, arguments) }
            startOperation(this);
            try { return f.apply(this, arguments) }
            finally { endOperation(this); }
        }
    }
    function docMethodOp(f) {
        return function () {
            var cm = this.cm;
            if (!cm || cm.curOp) { return f.apply(this, arguments) }
            startOperation(cm);
            try { return f.apply(this, arguments) }
            finally { endOperation(cm); }
        }
    }

    // HIGHLIGHT WORKER

    function startWorker(cm, time) {
        if (cm.doc.highlightFrontier < cm.display.viewTo) { cm.state.highlight.set(time, bind(highlightWorker, cm)); }
    }

    function highlightWorker(cm) {
        var doc = cm.doc;
        if (doc.highlightFrontier >= cm.display.viewTo) { return }
        var end = +new Date + cm.options.workTime;
        var context = getContextBefore(cm, doc.highlightFrontier);
        var changedLines = [];

        doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
            if (context.line >= cm.display.viewFrom) { // Visible
                var oldStyles = line.styles;
                var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
                var highlighted = highlightLine(cm, line, context, true);
                if (resetState) { context.state = resetState; }
                line.styles = highlighted.styles;
                var oldCls = line.styleClasses, newCls = highlighted.classes;
                if (newCls) { line.styleClasses = newCls; }
                else if (oldCls) { line.styleClasses = null; }
                var ischange = !oldStyles || oldStyles.length != line.styles.length ||
                    oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
                for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }
                if (ischange) { changedLines.push(context.line); }
                line.stateAfter = context.save();
                context.nextLine();
            } else {
                if (line.text.length <= cm.options.maxHighlightLength) { processLine(cm, line.text, context); }
                line.stateAfter = context.line % 5 == 0 ? context.save() : null;
                context.nextLine();
            }
            if (+new Date > end) {
                startWorker(cm, cm.options.workDelay);
                return true
            }
        });
        doc.highlightFrontier = context.line;
        doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
        if (changedLines.length) {
            runInOp(cm, function () {
                for (var i = 0; i < changedLines.length; i++) { regLineChange(cm, changedLines[i], "text"); }
            });
        }
    }

    // DISPLAY DRAWING

    var DisplayUpdate = function (cm, viewport, force) {
        var display = cm.display;

        this.viewport = viewport;
        // Store some values that we'll need later (but don't want to force a relayout for)
        this.visible = visibleLines(display, cm.doc, viewport);
        this.editorIsHidden = !display.wrapper.offsetWidth;
        this.wrapperHeight = display.wrapper.clientHeight;
        this.wrapperWidth = display.wrapper.clientWidth;
        this.oldDisplayWidth = displayWidth(cm);
        this.force = force;
        this.dims = getDimensions(cm);
        this.events = [];
    };

    DisplayUpdate.prototype.signal = function (emitter, type) {
        if (hasHandler(emitter, type)) { this.events.push(arguments); }
    };
    DisplayUpdate.prototype.finish = function () {
        for (var i = 0; i < this.events.length; i++) { signal.apply(null, this.events[i]); }
    };

    function maybeClipScrollbars(cm) {
        var display = cm.display;
        if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
            display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
            display.heightForcer.style.height = scrollGap(cm) + "px";
            display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
            display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
            display.scrollbarsClipped = true;
        }
    }

    function selectionSnapshot(cm) {
        if (cm.hasFocus()) { return null }
        var active = activeElt(doc(cm));
        if (!active || !contains(cm.display.lineDiv, active)) { return null }
        var result = { activeElt: active };
        if (window.getSelection) {
            var sel = win(cm).getSelection();
            if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
                result.anchorNode = sel.anchorNode;
                result.anchorOffset = sel.anchorOffset;
                result.focusNode = sel.focusNode;
                result.focusOffset = sel.focusOffset;
            }
        }
        return result
    }

    function restoreSelection(snapshot) {
        if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt(snapshot.activeElt.ownerDocument)) { return }
        snapshot.activeElt.focus();
        if (!/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&
            snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
            var doc = snapshot.activeElt.ownerDocument;
            var sel = doc.defaultView.getSelection(), range = doc.createRange();
            range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
            range.collapse(false);
            sel.removeAllRanges();
            sel.addRange(range);
            sel.extend(snapshot.focusNode, snapshot.focusOffset);
        }
    }

    // Does the actual updating of the line display. Bails out
    // (returning false) when there is nothing to be done and forced is
    // false.
    function updateDisplayIfNeeded(cm, update) {
        var display = cm.display, doc = cm.doc;

        if (update.editorIsHidden) {
            resetView(cm);
            return false
        }

        // Bail out if the visible area is already rendered and nothing changed.
        if (!update.force &&
            update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
            (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
            display.renderedView == display.view && countDirtyView(cm) == 0) { return false }

        if (maybeUpdateLineNumberWidth(cm)) {
            resetView(cm);
            update.dims = getDimensions(cm);
        }

        // Compute a suitable new viewport (from & to)
        var end = doc.first + doc.size;
        var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
        var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
        if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }
        if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }
        if (sawCollapsedSpans) {
            from = visualLineNo(cm.doc, from);
            to = visualLineEndNo(cm.doc, to);
        }

        var different = from != display.viewFrom || to != display.viewTo ||
            display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
        adjustView(cm, from, to);

        display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
        // Position the mover div to align with the current scroll position
        cm.display.mover.style.top = display.viewOffset + "px";

        var toUpdate = countDirtyView(cm);
        if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
            (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo)) { return false }

        // For big changes, we hide the enclosing element during the
        // update, since that speeds up the operations on most browsers.
        var selSnapshot = selectionSnapshot(cm);
        if (toUpdate > 4) { display.lineDiv.style.display = "none"; }
        patchDisplay(cm, display.updateLineNumbers, update.dims);
        if (toUpdate > 4) { display.lineDiv.style.display = ""; }
        display.renderedView = display.view;
        // There might have been a widget with a focused element that got
        // hidden or updated, if so re-focus it.
        restoreSelection(selSnapshot);

        // Prevent selection and cursors from interfering with the scroll
        // width and height.
        removeChildren(display.cursorDiv);
        removeChildren(display.selectionDiv);
        display.gutters.style.height = display.sizer.style.minHeight = 0;

        if (different) {
            display.lastWrapHeight = update.wrapperHeight;
            display.lastWrapWidth = update.wrapperWidth;
            startWorker(cm, 400);
        }

        display.updateLineNumbers = null;

        return true
    }

    function postUpdateDisplay(cm, update) {
        var viewport = update.viewport;

        for (var first = true; ; first = false) {
            if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
                // Clip forced viewport to actual scrollable area.
                if (viewport && viewport.top != null) { viewport = { top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top) }; }
                // Updated line heights might result in the drawn area not
                // actually covering the viewport. Keep looping until it does.
                update.visible = visibleLines(cm.display, cm.doc, viewport);
                if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo) { break }
            } else if (first) {
                update.visible = visibleLines(cm.display, cm.doc, viewport);
            }
            if (!updateDisplayIfNeeded(cm, update)) { break }
            updateHeightsInViewport(cm);
            var barMeasure = measureForScrollbars(cm);
            updateSelection(cm);
            updateScrollbars(cm, barMeasure);
            setDocumentHeight(cm, barMeasure);
            update.force = false;
        }

        update.signal(cm, "update", cm);
        if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
            update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
            cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
        }
    }

    function updateDisplaySimple(cm, viewport) {
        var update = new DisplayUpdate(cm, viewport);
        if (updateDisplayIfNeeded(cm, update)) {
            updateHeightsInViewport(cm);
            postUpdateDisplay(cm, update);
            var barMeasure = measureForScrollbars(cm);
            updateSelection(cm);
            updateScrollbars(cm, barMeasure);
            setDocumentHeight(cm, barMeasure);
            update.finish();
        }
    }

    // Sync the actual display DOM structure with display.view, removing
    // nodes for lines that are no longer in view, and creating the ones
    // that are not there yet, and updating the ones that are out of
    // date.
    function patchDisplay(cm, updateNumbersFrom, dims) {
        var display = cm.display, lineNumbers = cm.options.lineNumbers;
        var container = display.lineDiv, cur = container.firstChild;

        function rm(node) {
            var next = node.nextSibling;
            // Works around a throw-scroll bug in OS X Webkit
            if (webkit && mac && cm.display.currentWheelTarget == node) { node.style.display = "none"; }
            else { node.parentNode.removeChild(node); }
            return next
        }

        var view = display.view, lineN = display.viewFrom;
        // Loop over the elements in the view, syncing cur (the DOM nodes
        // in display.lineDiv) with the view as we go.
        for (var i = 0; i < view.length; i++) {
            var lineView = view[i];
            if (lineView.hidden); else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
                var node = buildLineElement(cm, lineView, lineN, dims);
                container.insertBefore(node, cur);
            } else { // Already drawn
                while (cur != lineView.node) { cur = rm(cur); }
                var updateNumber = lineNumbers && updateNumbersFrom != null &&
                    updateNumbersFrom <= lineN && lineView.lineNumber;
                if (lineView.changes) {
                    if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false; }
                    updateLineForChanges(cm, lineView, lineN, dims);
                }
                if (updateNumber) {
                    removeChildren(lineView.lineNumber);
                    lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
                }
                cur = lineView.node.nextSibling;
            }
            lineN += lineView.size;
        }
        while (cur) { cur = rm(cur); }
    }

    function updateGutterSpace(display) {
        var width = display.gutters.offsetWidth;
        display.sizer.style.marginLeft = width + "px";
        // Send an event to consumers responding to changes in gutter width.
        signalLater(display, "gutterChanged", display);
    }

    function setDocumentHeight(cm, measure) {
        cm.display.sizer.style.minHeight = measure.docHeight + "px";
        cm.display.heightForcer.style.top = measure.docHeight + "px";
        cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
    }

    // Re-align line numbers and gutter marks to compensate for
    // horizontal scrolling.
    function alignHorizontally(cm) {
        var display = cm.display, view = display.view;
        if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
        var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
        var gutterW = display.gutters.offsetWidth, left = comp + "px";
        for (var i = 0; i < view.length; i++) {
            if (!view[i].hidden) {
                if (cm.options.fixedGutter) {
                    if (view[i].gutter) { view[i].gutter.style.left = left; }
                    if (view[i].gutterBackground) { view[i].gutterBackground.style.left = left; }
                }
                var align = view[i].alignable;
                if (align) {
                    for (var j = 0; j < align.length; j++) { align[j].style.left = left; }
                }
            }
        }
        if (cm.options.fixedGutter) { display.gutters.style.left = (comp + gutterW) + "px"; }
    }

    // Used to ensure that the line number gutter is still the right
    // size for the current document size. Returns true when an update
    // is needed.
    function maybeUpdateLineNumberWidth(cm) {
        if (!cm.options.lineNumbers) { return false }
        var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
        if (last.length != display.lineNumChars) {
            var test = display.measure.appendChild(elt("div", [elt("div", last)],
                "CodeMirror-linenumber CodeMirror-gutter-elt"));
            var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
            display.lineGutter.style.width = "";
            display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
            display.lineNumWidth = display.lineNumInnerWidth + padding;
            display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
            display.lineGutter.style.width = display.lineNumWidth + "px";
            updateGutterSpace(cm.display);
            return true
        }
        return false
    }

    function getGutters(gutters, lineNumbers) {
        var result = [], sawLineNumbers = false;
        for (var i = 0; i < gutters.length; i++) {
            var name = gutters[i], style = null;
            if (typeof name != "string") { style = name.style; name = name.className; }
            if (name == "CodeMirror-linenumbers") {
                if (!lineNumbers) { continue }
                else { sawLineNumbers = true; }
            }
            result.push({ className: name, style: style });
        }
        if (lineNumbers && !sawLineNumbers) { result.push({ className: "CodeMirror-linenumbers", style: null }); }
        return result
    }

    // Rebuild the gutter elements, ensure the margin to the left of the
    // code matches their width.
    function renderGutters(display) {
        var gutters = display.gutters, specs = display.gutterSpecs;
        removeChildren(gutters);
        display.lineGutter = null;
        for (var i = 0; i < specs.length; ++i) {
            var ref = specs[i];
            var className = ref.className;
            var style = ref.style;
            var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + className));
            if (style) { gElt.style.cssText = style; }
            if (className == "CodeMirror-linenumbers") {
                display.lineGutter = gElt;
                gElt.style.width = (display.lineNumWidth || 1) + "px";
            }
        }
        gutters.style.display = specs.length ? "" : "none";
        updateGutterSpace(display);
    }

    function updateGutters(cm) {
        renderGutters(cm.display);
        regChange(cm);
        alignHorizontally(cm);
    }

    // The display handles the DOM integration, both for input reading
    // and content drawing. It holds references to DOM nodes and
    // display-related state.

    function Display(place, doc, input, options) {
        var d = this;
        this.input = input;

        // Covers bottom-right square when both scrollbars are present.
        d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
        d.scrollbarFiller.setAttribute("cm-not-content", "true");
        // Covers bottom of gutter when coverGutterNextToScrollbar is on
        // and h scrollbar is present.
        d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
        d.gutterFiller.setAttribute("cm-not-content", "true");
        // Will contain the actual code, positioned to cover the viewport.
        d.lineDiv = eltP("div", null, "CodeMirror-code");
        // Elements are added to these to represent selection and cursors.
        d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
        d.cursorDiv = elt("div", null, "CodeMirror-cursors");
        // A visibility: hidden element used to find the size of things.
        d.measure = elt("div", null, "CodeMirror-measure");
        // When lines outside of the viewport are measured, they are drawn in this.
        d.lineMeasure = elt("div", null, "CodeMirror-measure");
        // Wraps everything that needs to exist inside the vertically-padded coordinate system
        d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
            null, "position: relative; outline: none");
        var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
        // Moved around its parent to cover visible view.
        d.mover = elt("div", [lines], null, "position: relative");
        // Set to the height of the document, allowing scrolling.
        d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
        d.sizerWidth = null;
        // Behavior of elts with overflow: auto and padding is
        // inconsistent across browsers. This is used to ensure the
        // scrollable area is big enough.
        d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
        // Will contain the gutters, if any.
        d.gutters = elt("div", null, "CodeMirror-gutters");
        d.lineGutter = null;
        // Actual scrollable element.
        d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
        d.scroller.setAttribute("tabIndex", "-1");
        // The element in which the editor lives.
        d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

        // This attribute is respected by automatic translation systems such as Google Translate,
        // and may also be respected by tools used by human translators.
        d.wrapper.setAttribute('translate', 'no');

        // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
        if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
        if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }

        if (place) {
            if (place.appendChild) { place.appendChild(d.wrapper); }
            else { place(d.wrapper); }
        }

        // Current rendered range (may be bigger than the view window).
        d.viewFrom = d.viewTo = doc.first;
        d.reportedViewFrom = d.reportedViewTo = doc.first;
        // Information about the rendered lines.
        d.view = [];
        d.renderedView = null;
        // Holds info about a single rendered line when it was rendered
        // for measurement, while not in view.
        d.externalMeasured = null;
        // Empty space (in pixels) above the view
        d.viewOffset = 0;
        d.lastWrapHeight = d.lastWrapWidth = 0;
        d.updateLineNumbers = null;

        d.nativeBarWidth = d.barHeight = d.barWidth = 0;
        d.scrollbarsClipped = false;

        // Used to only resize the line number gutter when necessary (when
        // the amount of lines crosses a boundary that makes its width change)
        d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
        // Set to true when a non-horizontal-scrolling line widget is
        // added. As an optimization, line widget aligning is skipped when
        // this is false.
        d.alignWidgets = false;

        d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

        // Tracks the maximum line length so that the horizontal scrollbar
        // can be kept static when scrolling.
        d.maxLine = null;
        d.maxLineLength = 0;
        d.maxLineChanged = false;

        // Used for measuring wheel scrolling granularity
        d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

        // True when shift is held down.
        d.shift = false;

        // Used to track whether anything happened since the context menu
        // was opened.
        d.selForContextMenu = null;

        d.activeTouch = null;

        d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);
        renderGutters(d);

        input.init(d);
    }

    // Since the delta values reported on mouse wheel events are
    // unstandardized between browsers and even browser versions, and
    // generally horribly unpredictable, this code starts by measuring
    // the scroll effect that the first few mouse wheel events have,
    // and, from that, detects the way it can convert deltas to pixel
    // offsets afterwards.
    //
    // The reason we want to know the amount a wheel event will scroll
    // is that it gives us a chance to update the display before the
    // actual scrolling happens, reducing flickering.

    var wheelSamples = 0, wheelPixelsPerUnit = null;
    // Fill in a browser-detected starting value on browsers where we
    // know one. These don't have to be accurate -- the result of them
    // being wrong would just be a slight flicker on the first wheel
    // scroll (if it is large enough).
    if (ie) { wheelPixelsPerUnit = -.53; }
    else if (gecko) { wheelPixelsPerUnit = 15; }
    else if (chrome) { wheelPixelsPerUnit = -.7; }
    else if (safari) { wheelPixelsPerUnit = -1 / 3; }

    function wheelEventDelta(e) {
        var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
        if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }
        if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }
        else if (dy == null) { dy = e.wheelDelta; }
        return { x: dx, y: dy }
    }
    function wheelEventPixels(e) {
        var delta = wheelEventDelta(e);
        delta.x *= wheelPixelsPerUnit;
        delta.y *= wheelPixelsPerUnit;
        return delta
    }

    function onScrollWheel(cm, e) {
        // On Chrome 102, viewport updates somehow stop wheel-based
        // scrolling. Turning off pointer events during the scroll seems
        // to avoid the issue.
        if (chrome && chrome_version == 102) {
            if (cm.display.chromeScrollHack == null) { cm.display.sizer.style.pointerEvents = "none"; }
            else { clearTimeout(cm.display.chromeScrollHack); }
            cm.display.chromeScrollHack = setTimeout(function () {
                cm.display.chromeScrollHack = null;
                cm.display.sizer.style.pointerEvents = "";
            }, 100);
        }
        var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;
        var pixelsPerUnit = wheelPixelsPerUnit;
        if (e.deltaMode === 0) {
            dx = e.deltaX;
            dy = e.deltaY;
            pixelsPerUnit = 1;
        }

        var display = cm.display, scroll = display.scroller;
        // Quit if there's nothing to scroll here
        var canScrollX = scroll.scrollWidth > scroll.clientWidth;
        var canScrollY = scroll.scrollHeight > scroll.clientHeight;
        if (!(dx && canScrollX || dy && canScrollY)) { return }

        // Webkit browsers on OS X abort momentum scrolls when the target
        // of the scroll event is removed from the scrollable element.
        // This hack (see related code in patchDisplay) makes sure the
        // element is kept around.
        if (dy && mac && webkit) {
            outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
                for (var i = 0; i < view.length; i++) {
                    if (view[i].node == cur) {
                        cm.display.currentWheelTarget = cur;
                        break outer
                    }
                }
            }
        }

        // On some browsers, horizontal scrolling will cause redraws to
        // happen before the gutter has been realigned, causing it to
        // wriggle around in a most unseemly way. When we have an
        // estimated pixels/delta value, we just handle horizontal
        // scrolling entirely here. It'll be slightly off from native, but
        // better than glitching out.
        if (dx && !gecko && !presto && pixelsPerUnit != null) {
            if (dy && canScrollY) { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * pixelsPerUnit)); }
            setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * pixelsPerUnit));
            // Only prevent default scrolling if vertical scrolling is
            // actually possible. Otherwise, it causes vertical scroll
            // jitter on OSX trackpads when deltaX is small and deltaY
            // is large (issue #3579)
            if (!dy || (dy && canScrollY)) { e_preventDefault(e); }
            display.wheelStartX = null; // Abort measurement, if in progress
            return
        }

        // 'Project' the visible viewport to cover the area that is being
        // scrolled into view (if we know enough to estimate it).
        if (dy && pixelsPerUnit != null) {
            var pixels = dy * pixelsPerUnit;
            var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
            if (pixels < 0) { top = Math.max(0, top + pixels - 50); }
            else { bot = Math.min(cm.doc.height, bot + pixels + 50); }
            updateDisplaySimple(cm, { top: top, bottom: bot });
        }

        if (wheelSamples < 20 && e.deltaMode !== 0) {
            if (display.wheelStartX == null) {
                display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
                display.wheelDX = dx; display.wheelDY = dy;
                setTimeout(function () {
                    if (display.wheelStartX == null) { return }
                    var movedX = scroll.scrollLeft - display.wheelStartX;
                    var movedY = scroll.scrollTop - display.wheelStartY;
                    var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
                        (movedX && display.wheelDX && movedX / display.wheelDX);
                    display.wheelStartX = display.wheelStartY = null;
                    if (!sample) { return }
                    wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
                    ++wheelSamples;
                }, 200);
            } else {
                display.wheelDX += dx; display.wheelDY += dy;
            }
        }
    }

    // Selection objects are immutable. A new one is created every time
    // the selection changes. A selection is one or more non-overlapping
    // (and non-touching) ranges, sorted, and an integer that indicates
    // which one is the primary selection (the one that's scrolled into
    // view, that getCursor returns, etc).
    var Selection = function (ranges, primIndex) {
        this.ranges = ranges;
        this.primIndex = primIndex;
    };

    Selection.prototype.primary = function () { return this.ranges[this.primIndex] };

    Selection.prototype.equals = function (other) {
        if (other == this) { return true }
        if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
        for (var i = 0; i < this.ranges.length; i++) {
            var here = this.ranges[i], there = other.ranges[i];
            if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
        }
        return true
    };

    Selection.prototype.deepCopy = function () {
        var out = [];
        for (var i = 0; i < this.ranges.length; i++) { out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head)); }
        return new Selection(out, this.primIndex)
    };

    Selection.prototype.somethingSelected = function () {
        for (var i = 0; i < this.ranges.length; i++) { if (!this.ranges[i].empty()) { return true } }
        return false
    };

    Selection.prototype.contains = function (pos, end) {
        if (!end) { end = pos; }
        for (var i = 0; i < this.ranges.length; i++) {
            var range = this.ranges[i];
            if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0) { return i }
        }
        return -1
    };

    var Range = function (anchor, head) {
        this.anchor = anchor; this.head = head;
    };

    Range.prototype.from = function () { return minPos(this.anchor, this.head) };
    Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
    Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };

    // Take an unsorted, potentially overlapping set of ranges, and
    // build a selection out of it. 'Consumes' ranges array (modifying
    // it).
    function normalizeSelection(cm, ranges, primIndex) {
        var mayTouch = cm && cm.options.selectionsMayTouch;
        var prim = ranges[primIndex];
        ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });
        primIndex = indexOf(ranges, prim);
        for (var i = 1; i < ranges.length; i++) {
            var cur = ranges[i], prev = ranges[i - 1];
            var diff = cmp(prev.to(), cur.from());
            if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
                var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
                var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
                if (i <= primIndex) { --primIndex; }
                ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
            }
        }
        return new Selection(ranges, primIndex)
    }

    function simpleSelection(anchor, head) {
        return new Selection([new Range(anchor, head || anchor)], 0)
    }

    // Compute the position of the end of a change (its 'to' property
    // refers to the pre-change end).
    function changeEnd(change) {
        if (!change.text) { return change.to }
        return Pos(change.from.line + change.text.length - 1,
            lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
    }

    // Adjust a position to refer to the post-change position of the
    // same text, or the end of the change if the change covers it.
    function adjustForChange(pos, change) {
        if (cmp(pos, change.from) < 0) { return pos }
        if (cmp(pos, change.to) <= 0) { return changeEnd(change) }

        var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
        if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }
        return Pos(line, ch)
    }

    function computeSelAfterChange(doc, change) {
        var out = [];
        for (var i = 0; i < doc.sel.ranges.length; i++) {
            var range = doc.sel.ranges[i];
            out.push(new Range(adjustForChange(range.anchor, change),
                adjustForChange(range.head, change)));
        }
        return normalizeSelection(doc.cm, out, doc.sel.primIndex)
    }

    function offsetPos(pos, old, nw) {
        if (pos.line == old.line) { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
        else { return Pos(nw.line + (pos.line - old.line), pos.ch) }
    }

    // Used by replaceSelections to allow moving the selection to the
    // start or around the replaced test. Hint may be "start" or "around".
    function computeReplacedSel(doc, changes, hint) {
        var out = [];
        var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
        for (var i = 0; i < changes.length; i++) {
            var change = changes[i];
            var from = offsetPos(change.from, oldPrev, newPrev);
            var to = offsetPos(changeEnd(change), oldPrev, newPrev);
            oldPrev = change.to;
            newPrev = to;
            if (hint == "around") {
                var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
                out[i] = new Range(inv ? to : from, inv ? from : to);
            } else {
                out[i] = new Range(from, from);
            }
        }
        return new Selection(out, doc.sel.primIndex)
    }

    // Used to get the editor into a consistent state again when options change.

    function loadMode(cm) {
        cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
        resetModeState(cm);
    }

    function resetModeState(cm) {
        cm.doc.iter(function (line) {
            if (line.stateAfter) { line.stateAfter = null; }
            if (line.styles) { line.styles = null; }
        });
        cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
        startWorker(cm, 100);
        cm.state.modeGen++;
        if (cm.curOp) { regChange(cm); }
    }

    // DOCUMENT DATA STRUCTURE

    // By default, updates that start and end at the beginning of a line
    // are treated specially, in order to make the association of line
    // widgets and marker elements with the text behave more intuitive.
    function isWholeLineUpdate(doc, change) {
        return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
            (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
    }

    // Perform a change on the document data structure.
    function updateDoc(doc, change, markedSpans, estimateHeight) {
        function spansFor(n) { return markedSpans ? markedSpans[n] : null }
        function update(line, text, spans) {
            updateLine(line, text, spans, estimateHeight);
            signalLater(line, "change", line, change);
        }
        function linesFor(start, end) {
            var result = [];
            for (var i = start; i < end; ++i) { result.push(new Line(text[i], spansFor(i), estimateHeight)); }
            return result
        }

        var from = change.from, to = change.to, text = change.text;
        var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
        var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;

        // Adjust the line structure
        if (change.full) {
            doc.insert(0, linesFor(0, text.length));
            doc.remove(text.length, doc.size - text.length);
        } else if (isWholeLineUpdate(doc, change)) {
            // This is a whole-line replace. Treated specially to make
            // sure line objects move the way they are supposed to.
            var added = linesFor(0, text.length - 1);
            update(lastLine, lastLine.text, lastSpans);
            if (nlines) { doc.remove(from.line, nlines); }
            if (added.length) { doc.insert(from.line, added); }
        } else if (firstLine == lastLine) {
            if (text.length == 1) {
                update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
            } else {
                var added$1 = linesFor(1, text.length - 1);
                added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
                update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
                doc.insert(from.line + 1, added$1);
            }
        } else if (text.length == 1) {
            update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
            doc.remove(from.line + 1, nlines);
        } else {
            update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
            update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
            var added$2 = linesFor(1, text.length - 1);
            if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }
            doc.insert(from.line + 1, added$2);
        }

        signalLater(doc, "change", doc, change);
    }

    // Call f for all linked documents.
    function linkedDocs(doc, f, sharedHistOnly) {
        function propagate(doc, skip, sharedHist) {
            if (doc.linked) {
                for (var i = 0; i < doc.linked.length; ++i) {
                    var rel = doc.linked[i];
                    if (rel.doc == skip) { continue }
                    var shared = sharedHist && rel.sharedHist;
                    if (sharedHistOnly && !shared) { continue }
                    f(rel.doc, shared);
                    propagate(rel.doc, doc, shared);
                }
            }
        }
        propagate(doc, null, true);
    }

    // Attach a document to an editor.
    function attachDoc(cm, doc) {
        if (doc.cm) { throw new Error("This document is already in use.") }
        cm.doc = doc;
        doc.cm = cm;
        estimateLineHeights(cm);
        loadMode(cm);
        setDirectionClass(cm);
        cm.options.direction = doc.direction;
        if (!cm.options.lineWrapping) { findMaxLine(cm); }
        cm.options.mode = doc.modeOption;
        regChange(cm);
    }

    function setDirectionClass(cm) {
        (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
    }

    function directionChanged(cm) {
        runInOp(cm, function () {
            setDirectionClass(cm);
            regChange(cm);
        });
    }

    function History(prev) {
        // Arrays of change events and selections. Doing something adds an
        // event to done and clears undo. Undoing moves events from done
        // to undone, redoing moves them in the other direction.
        this.done = []; this.undone = [];
        this.undoDepth = prev ? prev.undoDepth : Infinity;
        // Used to track when changes can be merged into a single undo
        // event
        this.lastModTime = this.lastSelTime = 0;
        this.lastOp = this.lastSelOp = null;
        this.lastOrigin = this.lastSelOrigin = null;
        // Used by the isClean() method
        this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1;
    }

    // Create a history change event from an updateDoc-style change
    // object.
    function historyChangeFromChange(doc, change) {
        var histChange = { from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to) };
        attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
        linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);
        return histChange
    }

    // Pop all selection events off the end of a history array. Stop at
    // a change event.
    function clearSelectionEvents(array) {
        while (array.length) {
            var last = lst(array);
            if (last.ranges) { array.pop(); }
            else { break }
        }
    }

    // Find the top change event in the history. Pop off selection
    // events that are in the way.
    function lastChangeEvent(hist, force) {
        if (force) {
            clearSelectionEvents(hist.done);
            return lst(hist.done)
        } else if (hist.done.length && !lst(hist.done).ranges) {
            return lst(hist.done)
        } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
            hist.done.pop();
            return lst(hist.done)
        }
    }

    // Register a change in the history. Merges changes that are within
    // a single operation, or are close together with an origin that
    // allows merging (starting with "+") into a single event.
    function addChangeToHistory(doc, change, selAfter, opId) {
        var hist = doc.history;
        hist.undone.length = 0;
        var time = +new Date, cur;
        var last;

        if ((hist.lastOp == opId ||
            hist.lastOrigin == change.origin && change.origin &&
            ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
                change.origin.charAt(0) == "*")) &&
            (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
            // Merge this change into the last event
            last = lst(cur.changes);
            if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
                // Optimized case for simple insertion -- don't want to add
                // new changesets for every character typed
                last.to = changeEnd(change);
            } else {
                // Add new sub-event
                cur.changes.push(historyChangeFromChange(doc, change));
            }
        } else {
            // Can not be merged, start a new event.
            var before = lst(hist.done);
            if (!before || !before.ranges) { pushSelectionToHistory(doc.sel, hist.done); }
            cur = {
                changes: [historyChangeFromChange(doc, change)],
                generation: hist.generation
            };
            hist.done.push(cur);
            while (hist.done.length > hist.undoDepth) {
                hist.done.shift();
                if (!hist.done[0].ranges) { hist.done.shift(); }
            }
        }
        hist.done.push(selAfter);
        hist.generation = ++hist.maxGeneration;
        hist.lastModTime = hist.lastSelTime = time;
        hist.lastOp = hist.lastSelOp = opId;
        hist.lastOrigin = hist.lastSelOrigin = change.origin;

        if (!last) { signal(doc, "historyAdded"); }
    }

    function selectionEventCanBeMerged(doc, origin, prev, sel) {
        var ch = origin.charAt(0);
        return ch == "*" ||
            ch == "+" &&
            prev.ranges.length == sel.ranges.length &&
            prev.somethingSelected() == sel.somethingSelected() &&
            new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
    }

    // Called whenever the selection changes, sets the new selection as
    // the pending selection in the history, and pushes the old pending
    // selection into the 'done' array when it was significantly
    // different (in number of selected ranges, emptiness, or time).
    function addSelectionToHistory(doc, sel, opId, options) {
        var hist = doc.history, origin = options && options.origin;

        // A new event is started when the previous origin does not match
        // the current, or the origins don't allow matching. Origins
        // starting with * are always merged, those starting with + are
        // merged when similar and close together in time.
        if (opId == hist.lastSelOp ||
            (origin && hist.lastSelOrigin == origin &&
                (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
                    selectionEventCanBeMerged(doc, origin, lst(hist.done), sel)))) { hist.done[hist.done.length - 1] = sel; }
        else { pushSelectionToHistory(sel, hist.done); }

        hist.lastSelTime = +new Date;
        hist.lastSelOrigin = origin;
        hist.lastSelOp = opId;
        if (options && options.clearRedo !== false) { clearSelectionEvents(hist.undone); }
    }

    function pushSelectionToHistory(sel, dest) {
        var top = lst(dest);
        if (!(top && top.ranges && top.equals(sel))) { dest.push(sel); }
    }

    // Used to store marked span information in the history.
    function attachLocalSpans(doc, change, from, to) {
        var existing = change["spans_" + doc.id], n = 0;
        doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
            if (line.markedSpans) { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans; }
            ++n;
        });
    }

    // When un/re-doing restores text containing marked spans, those
    // that have been explicitly cleared should not be restored.
    function removeClearedSpans(spans) {
        if (!spans) { return null }
        var out;
        for (var i = 0; i < spans.length; ++i) {
            if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }
            else if (out) { out.push(spans[i]); }
        }
        return !out ? spans : out.length ? out : null
    }

    // Retrieve and filter the old marked spans stored in a change event.
    function getOldSpans(doc, change) {
        var found = change["spans_" + doc.id];
        if (!found) { return null }
        var nw = [];
        for (var i = 0; i < change.text.length; ++i) { nw.push(removeClearedSpans(found[i])); }
        return nw
    }

    // Used for un/re-doing changes from the history. Combines the
    // result of computing the existing spans with the set of spans that
    // existed in the history (so that deleting around a span and then
    // undoing brings back the span).
    function mergeOldSpans(doc, change) {
        var old = getOldSpans(doc, change);
        var stretched = stretchSpansOverChange(doc, change);
        if (!old) { return stretched }
        if (!stretched) { return old }

        for (var i = 0; i < old.length; ++i) {
            var oldCur = old[i], stretchCur = stretched[i];
            if (oldCur && stretchCur) {
                spans: for (var j = 0; j < stretchCur.length; ++j) {
                    var span = stretchCur[j];
                    for (var k = 0; k < oldCur.length; ++k) { if (oldCur[k].marker == span.marker) { continue spans } }
                    oldCur.push(span);
                }
            } else if (stretchCur) {
                old[i] = stretchCur;
            }
        }
        return old
    }

    // Used both to provide a JSON-safe object in .getHistory, and, when
    // detaching a document, to split the history in two
    function copyHistoryArray(events, newGroup, instantiateSel) {
        var copy = [];
        for (var i = 0; i < events.length; ++i) {
            var event = events[i];
            if (event.ranges) {
                copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
                continue
            }
            var changes = event.changes, newChanges = [];
            copy.push({ changes: newChanges });
            for (var j = 0; j < changes.length; ++j) {
                var change = changes[j], m = (void 0);
                newChanges.push({ from: change.from, to: change.to, text: change.text });
                if (newGroup) {
                    for (var prop in change) {
                        if (m = prop.match(/^spans_(\d+)$/)) {
                            if (indexOf(newGroup, Number(m[1])) > -1) {
                                lst(newChanges)[prop] = change[prop];
                                delete change[prop];
                            }
                        }
                    }
                }
            }
        }
        return copy
    }

    // The 'scroll' parameter given to many of these indicated whether
    // the new cursor position should be scrolled into view after
    // modifying the selection.

    // If shift is held or the extend flag is set, extends a range to
    // include a given position (and optionally a second position).
    // Otherwise, simply returns the range between the given positions.
    // Used for cursor motion and such.
    function extendRange(range, head, other, extend) {
        if (extend) {
            var anchor = range.anchor;
            if (other) {
                var posBefore = cmp(head, anchor) < 0;
                if (posBefore != (cmp(other, anchor) < 0)) {
                    anchor = head;
                    head = other;
                } else if (posBefore != (cmp(head, other) < 0)) {
                    head = other;
                }
            }
            return new Range(anchor, head)
        } else {
            return new Range(other || head, head)
        }
    }

    // Extend the primary selection range, discard the rest.
    function extendSelection(doc, head, other, options, extend) {
        if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }
        setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
    }

    // Extend all selections (pos is an array of selections with length
    // equal the number of selections)
    function extendSelections(doc, heads, options) {
        var out = [];
        var extend = doc.cm && (doc.cm.display.shift || doc.extend);
        for (var i = 0; i < doc.sel.ranges.length; i++) { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }
        var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);
        setSelection(doc, newSel, options);
    }

    // Updates a single range in the selection.
    function replaceOneSelection(doc, i, range, options) {
        var ranges = doc.sel.ranges.slice(0);
        ranges[i] = range;
        setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);
    }

    // Reset the selection to a single range.
    function setSimpleSelection(doc, anchor, head, options) {
        setSelection(doc, simpleSelection(anchor, head), options);
    }

    // Give beforeSelectionChange handlers a change to influence a
    // selection update.
    function filterSelectionChange(doc, sel, options) {
        var obj = {
            ranges: sel.ranges,
            update: function (ranges) {
                this.ranges = [];
                for (var i = 0; i < ranges.length; i++) {
                    this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                        clipPos(doc, ranges[i].head));
                }
            },
            origin: options && options.origin
        };
        signal(doc, "beforeSelectionChange", doc, obj);
        if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj); }
        if (obj.ranges != sel.ranges) { return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1) }
        else { return sel }
    }

    function setSelectionReplaceHistory(doc, sel, options) {
        var done = doc.history.done, last = lst(done);
        if (last && last.ranges) {
            done[done.length - 1] = sel;
            setSelectionNoUndo(doc, sel, options);
        } else {
            setSelection(doc, sel, options);
        }
    }

    // Set a new selection.
    function setSelection(doc, sel, options) {
        setSelectionNoUndo(doc, sel, options);
        addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
    }

    function setSelectionNoUndo(doc, sel, options) {
        if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) { sel = filterSelectionChange(doc, sel, options); }

        var bias = options && options.bias ||
            (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
        setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

        if (!(options && options.scroll === false) && doc.cm && doc.cm.getOption("readOnly") != "nocursor") { ensureCursorVisible(doc.cm); }
    }

    function setSelectionInner(doc, sel) {
        if (sel.equals(doc.sel)) { return }

        doc.sel = sel;

        if (doc.cm) {
            doc.cm.curOp.updateInput = 1;
            doc.cm.curOp.selectionChanged = true;
            signalCursorActivity(doc.cm);
        }
        signalLater(doc, "cursorActivity", doc);
    }

    // Verify that the selection does not partially select any atomic
    // marked ranges.
    function reCheckSelection(doc) {
        setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
    }

    // Return a selection that does not partially select any atomic
    // ranges.
    function skipAtomicInSelection(doc, sel, bias, mayClear) {
        var out;
        for (var i = 0; i < sel.ranges.length; i++) {
            var range = sel.ranges[i];
            var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
            var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
            var newHead = range.head == range.anchor ? newAnchor : skipAtomic(doc, range.head, old && old.head, bias, mayClear);
            if (out || newAnchor != range.anchor || newHead != range.head) {
                if (!out) { out = sel.ranges.slice(0, i); }
                out[i] = new Range(newAnchor, newHead);
            }
        }
        return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel
    }

    function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
        var line = getLine(doc, pos.line);
        if (line.markedSpans) {
            for (var i = 0; i < line.markedSpans.length; ++i) {
                var sp = line.markedSpans[i], m = sp.marker;

                // Determine if we should prevent the cursor being placed to the left/right of an atomic marker
                // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it
                // is with selectLeft/Right
                var preventCursorLeft = ("selectLeft" in m) ? !m.selectLeft : m.inclusiveLeft;
                var preventCursorRight = ("selectRight" in m) ? !m.selectRight : m.inclusiveRight;

                if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
                    (sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
                    if (mayClear) {
                        signal(m, "beforeCursorEnter");
                        if (m.explicitlyCleared) {
                            if (!line.markedSpans) { break }
                            else { --i; continue }
                        }
                    }
                    if (!m.atomic) { continue }

                    if (oldPos) {
                        var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);
                        if (dir < 0 ? preventCursorRight : preventCursorLeft) { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }
                        if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0)) { return skipAtomicInner(doc, near, pos, dir, mayClear) }
                    }

                    var far = m.find(dir < 0 ? -1 : 1);
                    if (dir < 0 ? preventCursorLeft : preventCursorRight) { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }
                    return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
                }
            }
        }
        return pos
    }

    // Ensure a given position is not inside an atomic range.
    function skipAtomic(doc, pos, oldPos, bias, mayClear) {
        var dir = bias || 1;
        var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
            (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
            skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
            (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
        if (!found) {
            doc.cantEdit = true;
            return Pos(doc.first, 0)
        }
        return found
    }

    function movePos(doc, pos, dir, line) {
        if (dir < 0 && pos.ch == 0) {
            if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
            else { return null }
        } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
            if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
            else { return null }
        } else {
            return new Pos(pos.line, pos.ch + dir)
        }
    }

    function selectAll(cm) {
        cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
    }

    // UPDATING

    // Allow "beforeChange" event handlers to influence a change
    function filterChange(doc, change, update) {
        var obj = {
            canceled: false,
            from: change.from,
            to: change.to,
            text: change.text,
            origin: change.origin,
            cancel: function () { return obj.canceled = true; }
        };
        if (update) {
            obj.update = function (from, to, text, origin) {
                if (from) { obj.from = clipPos(doc, from); }
                if (to) { obj.to = clipPos(doc, to); }
                if (text) { obj.text = text; }
                if (origin !== undefined) { obj.origin = origin; }
            };
        }
        signal(doc, "beforeChange", doc, obj);
        if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj); }

        if (obj.canceled) {
            if (doc.cm) { doc.cm.curOp.updateInput = 2; }
            return null
        }
        return { from: obj.from, to: obj.to, text: obj.text, origin: obj.origin }
    }

    // Apply a change to a document, and add it to the document's
    // history, and propagating it to all linked documents.
    function makeChange(doc, change, ignoreReadOnly) {
        if (doc.cm) {
            if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
            if (doc.cm.state.suppressEdits) { return }
        }

        if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
            change = filterChange(doc, change, true);
            if (!change) { return }
        }

        // Possibly split or suppress the update based on the presence
        // of read-only spans in its range.
        var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
        if (split) {
            for (var i = split.length - 1; i >= 0; --i) { makeChangeInner(doc, { from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin }); }
        } else {
            makeChangeInner(doc, change);
        }
    }

    function makeChangeInner(doc, change) {
        if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
        var selAfter = computeSelAfterChange(doc, change);
        addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

        makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
        var rebased = [];

        linkedDocs(doc, function (doc, sharedHist) {
            if (!sharedHist && indexOf(rebased, doc.history) == -1) {
                rebaseHist(doc.history, change);
                rebased.push(doc.history);
            }
            makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
        });
    }

    // Revert a change stored in a document's history.
    function makeChangeFromHistory(doc, type, allowSelectionOnly) {
        var suppress = doc.cm && doc.cm.state.suppressEdits;
        if (suppress && !allowSelectionOnly) { return }

        var hist = doc.history, event, selAfter = doc.sel;
        var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;

        // Verify that there is a useable event (so that ctrl-z won't
        // needlessly clear selection events)
        var i = 0;
        for (; i < source.length; i++) {
            event = source[i];
            if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges) { break }
        }
        if (i == source.length) { return }
        hist.lastOrigin = hist.lastSelOrigin = null;

        for (; ;) {
            event = source.pop();
            if (event.ranges) {
                pushSelectionToHistory(event, dest);
                if (allowSelectionOnly && !event.equals(doc.sel)) {
                    setSelection(doc, event, { clearRedo: false });
                    return
                }
                selAfter = event;
            } else if (suppress) {
                source.push(event);
                return
            } else { break }
        }

        // Build up a reverse change object to add to the opposite history
        // stack (redo when undoing, and vice versa).
        var antiChanges = [];
        pushSelectionToHistory(selAfter, dest);
        dest.push({ changes: antiChanges, generation: hist.generation });
        hist.generation = event.generation || ++hist.maxGeneration;

        var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

        var loop = function (i) {
            var change = event.changes[i];
            change.origin = type;
            if (filter && !filterChange(doc, change, false)) {
                source.length = 0;
                return {}
            }

            antiChanges.push(historyChangeFromChange(doc, change));

            var after = i ? computeSelAfterChange(doc, change) : lst(source);
            makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
            if (!i && doc.cm) { doc.cm.scrollIntoView({ from: change.from, to: changeEnd(change) }); }
            var rebased = [];

            // Propagate to the linked documents
            linkedDocs(doc, function (doc, sharedHist) {
                if (!sharedHist && indexOf(rebased, doc.history) == -1) {
                    rebaseHist(doc.history, change);
                    rebased.push(doc.history);
                }
                makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
            });
        };

        for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
            var returned = loop(i$1);

            if (returned) return returned.v;
        }
    }

    // Sub-views need their line numbers shifted when text is added
    // above or below them in the parent document.
    function shiftDoc(doc, distance) {
        if (distance == 0) { return }
        doc.first += distance;
        doc.sel = new Selection(map(doc.sel.ranges, function (range) {
            return new Range(
                Pos(range.anchor.line + distance, range.anchor.ch),
                Pos(range.head.line + distance, range.head.ch)
            );
        }), doc.sel.primIndex);
        if (doc.cm) {
            regChange(doc.cm, doc.first, doc.first - distance, distance);
            for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++) { regLineChange(doc.cm, l, "gutter"); }
        }
    }

    // More lower-level change function, handling only a single document
    // (not linked ones).
    function makeChangeSingleDoc(doc, change, selAfter, spans) {
        if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }

        if (change.to.line < doc.first) {
            shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
            return
        }
        if (change.from.line > doc.lastLine()) { return }

        // Clip the change to the size of this doc
        if (change.from.line < doc.first) {
            var shift = change.text.length - 1 - (doc.first - change.from.line);
            shiftDoc(doc, shift);
            change = {
                from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
                text: [lst(change.text)], origin: change.origin
            };
        }
        var last = doc.lastLine();
        if (change.to.line > last) {
            change = {
                from: change.from, to: Pos(last, getLine(doc, last).text.length),
                text: [change.text[0]], origin: change.origin
            };
        }

        change.removed = getBetween(doc, change.from, change.to);

        if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }
        if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }
        else { updateDoc(doc, change, spans); }
        setSelectionNoUndo(doc, selAfter, sel_dontScroll);

        if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0))) { doc.cantEdit = false; }
    }

    // Handle the interaction of a change to a document with the editor
    // that this document is part of.
    function makeChangeSingleDocInEditor(cm, change, spans) {
        var doc = cm.doc, display = cm.display, from = change.from, to = change.to;

        var recomputeMaxLength = false, checkWidthStart = from.line;
        if (!cm.options.lineWrapping) {
            checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
            doc.iter(checkWidthStart, to.line + 1, function (line) {
                if (line == display.maxLine) {
                    recomputeMaxLength = true;
                    return true
                }
            });
        }

        if (doc.sel.contains(change.from, change.to) > -1) { signalCursorActivity(cm); }

        updateDoc(doc, change, spans, estimateHeight(cm));

        if (!cm.options.lineWrapping) {
            doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
                var len = lineLength(line);
                if (len > display.maxLineLength) {
                    display.maxLine = line;
                    display.maxLineLength = len;
                    display.maxLineChanged = true;
                    recomputeMaxLength = false;
                }
            });
            if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }
        }

        retreatFrontier(doc, from.line);
        startWorker(cm, 400);

        var lendiff = change.text.length - (to.line - from.line) - 1;
        // Remember that these lines changed, for updating the display
        if (change.full) { regChange(cm); }
        else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change)) { regLineChange(cm, from.line, "text"); }
        else { regChange(cm, from.line, to.line + 1, lendiff); }

        var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
        if (changeHandler || changesHandler) {
            var obj = {
                from: from, to: to,
                text: change.text,
                removed: change.removed,
                origin: change.origin
            };
            if (changeHandler) { signalLater(cm, "change", cm, obj); }
            if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }
        }
        cm.display.selForContextMenu = null;
    }

    function replaceRange(doc, code, from, to, origin) {
        var assign;

        if (!to) { to = from; }
        if (cmp(to, from) < 0) { (assign = [to, from], from = assign[0], to = assign[1]); }
        if (typeof code == "string") { code = doc.splitLines(code); }
        makeChange(doc, { from: from, to: to, text: code, origin: origin });
    }

    // Rebasing/resetting history to deal with externally-sourced changes

    function rebaseHistSelSingle(pos, from, to, diff) {
        if (to < pos.line) {
            pos.line += diff;
        } else if (from < pos.line) {
            pos.line = from;
            pos.ch = 0;
        }
    }

    // Tries to rebase an array of history events given a change in the
    // document. If the change touches the same lines as the event, the
    // event, and everything 'behind' it, is discarded. If the change is
    // before the event, the event's positions are updated. Uses a
    // copy-on-write scheme for the positions, to avoid having to
    // reallocate them all on every rebase, but also avoid problems with
    // shared position objects being unsafely updated.
    function rebaseHistArray(array, from, to, diff) {
        for (var i = 0; i < array.length; ++i) {
            var sub = array[i], ok = true;
            if (sub.ranges) {
                if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
                for (var j = 0; j < sub.ranges.length; j++) {
                    rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
                    rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
                }
                continue
            }
            for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
                var cur = sub.changes[j$1];
                if (to < cur.from.line) {
                    cur.from = Pos(cur.from.line + diff, cur.from.ch);
                    cur.to = Pos(cur.to.line + diff, cur.to.ch);
                } else if (from <= cur.to.line) {
                    ok = false;
                    break
                }
            }
            if (!ok) {
                array.splice(0, i + 1);
                i = 0;
            }
        }
    }

    function rebaseHist(hist, change) {
        var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
        rebaseHistArray(hist.done, from, to, diff);
        rebaseHistArray(hist.undone, from, to, diff);
    }

    // Utility for applying a change to a line by handle or number,
    // returning the number and optionally registering the line as
    // changed.
    function changeLine(doc, handle, changeType, op) {
        var no = handle, line = handle;
        if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)); }
        else { no = lineNo(handle); }
        if (no == null) { return null }
        if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }
        return line
    }

    // The document is represented as a BTree consisting of leaves, with
    // chunk of lines in them, and branches, with up to ten leaves or
    // other branch nodes below them. The top node is always a branch
    // node, and is the document object itself (meaning it has
    // additional methods and properties).
    //
    // All nodes have parent links. The tree is used both to go from
    // line numbers to line objects, and to go from objects to numbers.
    // It also indexes by height, and is used to convert between height
    // and line object, and to find the total height of the document.
    //
    // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

    function LeafChunk(lines) {
        this.lines = lines;
        this.parent = null;
        var height = 0;
        for (var i = 0; i < lines.length; ++i) {
            lines[i].parent = this;
            height += lines[i].height;
        }
        this.height = height;
    }

    LeafChunk.prototype = {
        chunkSize: function () { return this.lines.length },

        // Remove the n lines at offset 'at'.
        removeInner: function (at, n) {
            for (var i = at, e = at + n; i < e; ++i) {
                var line = this.lines[i];
                this.height -= line.height;
                cleanUpLine(line);
                signalLater(line, "delete");
            }
            this.lines.splice(at, n);
        },

        // Helper used to collapse a small branch into a single leaf.
        collapse: function (lines) {
            lines.push.apply(lines, this.lines);
        },

        // Insert the given array of lines at offset 'at', count them as
        // having the given height.
        insertInner: function (at, lines, height) {
            this.height += height;
            this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
            for (var i = 0; i < lines.length; ++i) { lines[i].parent = this; }
        },

        // Used to iterate over a part of the tree.
        iterN: function (at, n, op) {
            for (var e = at + n; at < e; ++at) { if (op(this.lines[at])) { return true } }
        }
    };

    function BranchChunk(children) {
        this.children = children;
        var size = 0, height = 0;
        for (var i = 0; i < children.length; ++i) {
            var ch = children[i];
            size += ch.chunkSize(); height += ch.height;
            ch.parent = this;
        }
        this.size = size;
        this.height = height;
        this.parent = null;
    }

    BranchChunk.prototype = {
        chunkSize: function () { return this.size },

        removeInner: function (at, n) {
            this.size -= n;
            for (var i = 0; i < this.children.length; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at < sz) {
                    var rm = Math.min(n, sz - at), oldHeight = child.height;
                    child.removeInner(at, rm);
                    this.height -= oldHeight - child.height;
                    if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
                    if ((n -= rm) == 0) { break }
                    at = 0;
                } else { at -= sz; }
            }
            // If the result is smaller than 25 lines, ensure that it is a
            // single leaf node.
            if (this.size - n < 25 &&
                (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
                var lines = [];
                this.collapse(lines);
                this.children = [new LeafChunk(lines)];
                this.children[0].parent = this;
            }
        },

        collapse: function (lines) {
            for (var i = 0; i < this.children.length; ++i) { this.children[i].collapse(lines); }
        },

        insertInner: function (at, lines, height) {
            this.size += lines.length;
            this.height += height;
            for (var i = 0; i < this.children.length; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at <= sz) {
                    child.insertInner(at, lines, height);
                    if (child.lines && child.lines.length > 50) {
                        // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
                        // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
                        var remaining = child.lines.length % 25 + 25;
                        for (var pos = remaining; pos < child.lines.length;) {
                            var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
                            child.height -= leaf.height;
                            this.children.splice(++i, 0, leaf);
                            leaf.parent = this;
                        }
                        child.lines = child.lines.slice(0, remaining);
                        this.maybeSpill();
                    }
                    break
                }
                at -= sz;
            }
        },

        // When a node has grown, check whether it should be split.
        maybeSpill: function () {
            if (this.children.length <= 10) { return }
            var me = this;
            do {
                var spilled = me.children.splice(me.children.length - 5, 5);
                var sibling = new BranchChunk(spilled);
                if (!me.parent) { // Become the parent node
                    var copy = new BranchChunk(me.children);
                    copy.parent = me;
                    me.children = [copy, sibling];
                    me = copy;
                } else {
                    me.size -= sibling.size;
                    me.height -= sibling.height;
                    var myIndex = indexOf(me.parent.children, me);
                    me.parent.children.splice(myIndex + 1, 0, sibling);
                }
                sibling.parent = me.parent;
            } while (me.children.length > 10)
            me.parent.maybeSpill();
        },

        iterN: function (at, n, op) {
            for (var i = 0; i < this.children.length; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at < sz) {
                    var used = Math.min(n, sz - at);
                    if (child.iterN(at, used, op)) { return true }
                    if ((n -= used) == 0) { break }
                    at = 0;
                } else { at -= sz; }
            }
        }
    };

    // Line widgets are block elements displayed above or below a line.

    var LineWidget = function (doc, node, options) {
        if (options) {
            for (var opt in options) {
                if (options.hasOwnProperty(opt)) { this[opt] = options[opt]; }
            }
        }
        this.doc = doc;
        this.node = node;
    };

    LineWidget.prototype.clear = function () {
        var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
        if (no == null || !ws) { return }
        for (var i = 0; i < ws.length; ++i) { if (ws[i] == this) { ws.splice(i--, 1); } }
        if (!ws.length) { line.widgets = null; }
        var height = widgetHeight(this);
        updateLineHeight(line, Math.max(0, line.height - height));
        if (cm) {
            runInOp(cm, function () {
                adjustScrollWhenAboveVisible(cm, line, -height);
                regLineChange(cm, no, "widget");
            });
            signalLater(cm, "lineWidgetCleared", cm, this, no);
        }
    };

    LineWidget.prototype.changed = function () {
        var this$1 = this;

        var oldH = this.height, cm = this.doc.cm, line = this.line;
        this.height = null;
        var diff = widgetHeight(this) - oldH;
        if (!diff) { return }
        if (!lineIsHidden(this.doc, line)) { updateLineHeight(line, line.height + diff); }
        if (cm) {
            runInOp(cm, function () {
                cm.curOp.forceUpdate = true;
                adjustScrollWhenAboveVisible(cm, line, diff);
                signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
            });
        }
    };
    eventMixin(LineWidget);

    function adjustScrollWhenAboveVisible(cm, line, diff) {
        if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop)) { addToScrollTop(cm, diff); }
    }

    function addLineWidget(doc, handle, node, options) {
        var widget = new LineWidget(doc, node, options);
        var cm = doc.cm;
        if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }
        changeLine(doc, handle, "widget", function (line) {
            var widgets = line.widgets || (line.widgets = []);
            if (widget.insertAt == null) { widgets.push(widget); }
            else { widgets.splice(Math.min(widgets.length, Math.max(0, widget.insertAt)), 0, widget); }
            widget.line = line;
            if (cm && !lineIsHidden(doc, line)) {
                var aboveVisible = heightAtLine(line) < doc.scrollTop;
                updateLineHeight(line, line.height + widgetHeight(widget));
                if (aboveVisible) { addToScrollTop(cm, widget.height); }
                cm.curOp.forceUpdate = true;
            }
            return true
        });
        if (cm) { signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle)); }
        return widget
    }

    // TEXTMARKERS

    // Created with markText and setBookmark methods. A TextMarker is a
    // handle that can be used to clear or find a marked position in the
    // document. Line objects hold arrays (markedSpans) containing
    // {from, to, marker} object pointing to such marker objects, and
    // indicating that such a marker is present on that line. Multiple
    // lines may point to the same marker when it spans across lines.
    // The spans will have null for their from/to properties when the
    // marker continues beyond the start/end of the line. Markers have
    // links back to the lines they currently touch.

    // Collapsed markers have unique ids, in order to be able to order
    // them, which is needed for uniquely determining an outer marker
    // when they overlap (they may nest, but not partially overlap).
    var nextMarkerId = 0;

    var TextMarker = function (doc, type) {
        this.lines = [];
        this.type = type;
        this.doc = doc;
        this.id = ++nextMarkerId;
    };

    // Clear the marker.
    TextMarker.prototype.clear = function () {
        if (this.explicitlyCleared) { return }
        var cm = this.doc.cm, withOp = cm && !cm.curOp;
        if (withOp) { startOperation(cm); }
        if (hasHandler(this, "clear")) {
            var found = this.find();
            if (found) { signalLater(this, "clear", found.from, found.to); }
        }
        var min = null, max = null;
        for (var i = 0; i < this.lines.length; ++i) {
            var line = this.lines[i];
            var span = getMarkedSpanFor(line.markedSpans, this);
            if (cm && !this.collapsed) { regLineChange(cm, lineNo(line), "text"); }
            else if (cm) {
                if (span.to != null) { max = lineNo(line); }
                if (span.from != null) { min = lineNo(line); }
            }
            line.markedSpans = removeMarkedSpan(line.markedSpans, span);
            if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm) { updateLineHeight(line, textHeight(cm.display)); }
        }
        if (cm && this.collapsed && !cm.options.lineWrapping) {
            for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
                var visual = visualLine(this.lines[i$1]), len = lineLength(visual);
                if (len > cm.display.maxLineLength) {
                    cm.display.maxLine = visual;
                    cm.display.maxLineLength = len;
                    cm.display.maxLineChanged = true;
                }
            }
        }

        if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }
        this.lines.length = 0;
        this.explicitlyCleared = true;
        if (this.atomic && this.doc.cantEdit) {
            this.doc.cantEdit = false;
            if (cm) { reCheckSelection(cm.doc); }
        }
        if (cm) { signalLater(cm, "markerCleared", cm, this, min, max); }
        if (withOp) { endOperation(cm); }
        if (this.parent) { this.parent.clear(); }
    };

    // Find the position of the marker in the document. Returns a {from,
    // to} object by default. Side can be passed to get a specific side
    // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
    // Pos objects returned contain a line object, rather than a line
    // number (used to prevent looking up the same line twice).
    TextMarker.prototype.find = function (side, lineObj) {
        if (side == null && this.type == "bookmark") { side = 1; }
        var from, to;
        for (var i = 0; i < this.lines.length; ++i) {
            var line = this.lines[i];
            var span = getMarkedSpanFor(line.markedSpans, this);
            if (span.from != null) {
                from = Pos(lineObj ? line : lineNo(line), span.from);
                if (side == -1) { return from }
            }
            if (span.to != null) {
                to = Pos(lineObj ? line : lineNo(line), span.to);
                if (side == 1) { return to }
            }
        }
        return from && { from: from, to: to }
    };

    // Signals that the marker's widget changed, and surrounding layout
    // should be recomputed.
    TextMarker.prototype.changed = function () {
        var this$1 = this;

        var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
        if (!pos || !cm) { return }
        runInOp(cm, function () {
            var line = pos.line, lineN = lineNo(pos.line);
            var view = findViewForLine(cm, lineN);
            if (view) {
                clearLineMeasurementCacheFor(view);
                cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
            }
            cm.curOp.updateMaxLine = true;
            if (!lineIsHidden(widget.doc, line) && widget.height != null) {
                var oldHeight = widget.height;
                widget.height = null;
                var dHeight = widgetHeight(widget) - oldHeight;
                if (dHeight) { updateLineHeight(line, line.height + dHeight); }
            }
            signalLater(cm, "markerChanged", cm, this$1);
        });
    };

    TextMarker.prototype.attachLine = function (line) {
        if (!this.lines.length && this.doc.cm) {
            var op = this.doc.cm.curOp;
            if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1) { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }
        }
        this.lines.push(line);
    };

    TextMarker.prototype.detachLine = function (line) {
        this.lines.splice(indexOf(this.lines, line), 1);
        if (!this.lines.length && this.doc.cm) {
            var op = this.doc.cm.curOp
                ; (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
        }
    };
    eventMixin(TextMarker);

    // Create a marker, wire it up to the right lines, and
    function markText(doc, from, to, options, type) {
        // Shared markers (across linked documents) are handled separately
        // (markTextShared will call out to this again, once per
        // document).
        if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
        // Ensure we are in an operation.
        if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }

        var marker = new TextMarker(doc, type), diff = cmp(from, to);
        if (options) { copyObj(options, marker, false); }
        // Don't connect empty markers unless clearWhenEmpty is false
        if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false) { return marker }
        if (marker.replacedWith) {
            // Showing up as a widget implies collapsed (widget replaces text)
            marker.collapsed = true;
            marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
            if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true"); }
            if (options.insertLeft) { marker.widgetNode.insertLeft = true; }
        }
        if (marker.collapsed) {
            if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
                from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker)) { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
            seeCollapsedSpans();
        }

        if (marker.addToHistory) { addChangeToHistory(doc, { from: from, to: to, origin: "markText" }, doc.sel, NaN); }

        var curLine = from.line, cm = doc.cm, updateMaxLine;
        doc.iter(curLine, to.line + 1, function (line) {
            if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine) { updateMaxLine = true; }
            if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }
            addMarkedSpan(line, new MarkedSpan(marker,
                curLine == from.line ? from.ch : null,
                curLine == to.line ? to.ch : null), doc.cm && doc.cm.curOp);
            ++curLine;
        });
        // lineIsHidden depends on the presence of the spans, so needs a second pass
        if (marker.collapsed) {
            doc.iter(from.line, to.line + 1, function (line) {
                if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }
            });
        }

        if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }); }

        if (marker.readOnly) {
            seeReadOnlySpans();
            if (doc.history.done.length || doc.history.undone.length) { doc.clearHistory(); }
        }
        if (marker.collapsed) {
            marker.id = ++nextMarkerId;
            marker.atomic = true;
        }
        if (cm) {
            // Sync editor state
            if (updateMaxLine) { cm.curOp.updateMaxLine = true; }
            if (marker.collapsed) { regChange(cm, from.line, to.line + 1); }
            else if (marker.className || marker.startStyle || marker.endStyle || marker.css ||
                marker.attributes || marker.title) { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text"); } }
            if (marker.atomic) { reCheckSelection(cm.doc); }
            signalLater(cm, "markerAdded", cm, marker);
        }
        return marker
    }

    // SHARED TEXTMARKERS

    // A shared marker spans multiple linked documents. It is
    // implemented as a meta-marker-object controlling multiple normal
    // markers.
    var SharedTextMarker = function (markers, primary) {
        this.markers = markers;
        this.primary = primary;
        for (var i = 0; i < markers.length; ++i) { markers[i].parent = this; }
    };

    SharedTextMarker.prototype.clear = function () {
        if (this.explicitlyCleared) { return }
        this.explicitlyCleared = true;
        for (var i = 0; i < this.markers.length; ++i) { this.markers[i].clear(); }
        signalLater(this, "clear");
    };

    SharedTextMarker.prototype.find = function (side, lineObj) {
        return this.primary.find(side, lineObj)
    };
    eventMixin(SharedTextMarker);

    function markTextShared(doc, from, to, options, type) {
        options = copyObj(options);
        options.shared = false;
        var markers = [markText(doc, from, to, options, type)], primary = markers[0];
        var widget = options.widgetNode;
        linkedDocs(doc, function (doc) {
            if (widget) { options.widgetNode = widget.cloneNode(true); }
            markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
            for (var i = 0; i < doc.linked.length; ++i) { if (doc.linked[i].isParent) { return } }
            primary = lst(markers);
        });
        return new SharedTextMarker(markers, primary)
    }

    function findSharedMarkers(doc) {
        return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
    }

    function copySharedMarkers(doc, markers) {
        for (var i = 0; i < markers.length; i++) {
            var marker = markers[i], pos = marker.find();
            var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
            if (cmp(mFrom, mTo)) {
                var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
                marker.markers.push(subMark);
                subMark.parent = marker;
            }
        }
    }

    function detachSharedMarkers(markers) {
        var loop = function (i) {
            var marker = markers[i], linked = [marker.primary.doc];
            linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });
            for (var j = 0; j < marker.markers.length; j++) {
                var subMarker = marker.markers[j];
                if (indexOf(linked, subMarker.doc) == -1) {
                    subMarker.parent = null;
                    marker.markers.splice(j--, 1);
                }
            }
        };

        for (var i = 0; i < markers.length; i++) loop(i);
    }

    var nextDocId = 0;
    var Doc = function (text, mode, firstLine, lineSep, direction) {
        if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
        if (firstLine == null) { firstLine = 0; }

        BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
        this.first = firstLine;
        this.scrollTop = this.scrollLeft = 0;
        this.cantEdit = false;
        this.cleanGeneration = 1;
        this.modeFrontier = this.highlightFrontier = firstLine;
        var start = Pos(firstLine, 0);
        this.sel = simpleSelection(start);
        this.history = new History(null);
        this.id = ++nextDocId;
        this.modeOption = mode;
        this.lineSep = lineSep;
        this.direction = (direction == "rtl") ? "rtl" : "ltr";
        this.extend = false;

        if (typeof text == "string") { text = this.splitLines(text); }
        updateDoc(this, { from: start, to: start, text: text });
        setSelection(this, simpleSelection(start), sel_dontScroll);
    };

    Doc.prototype = createObj(BranchChunk.prototype, {
        constructor: Doc,
        // Iterate over the document. Supports two forms -- with only one
        // argument, it calls that for each line in the document. With
        // three, it iterates over the range given by the first two (with
        // the second being non-inclusive).
        iter: function (from, to, op) {
            if (op) { this.iterN(from - this.first, to - from, op); }
            else { this.iterN(this.first, this.first + this.size, from); }
        },

        // Non-public interface for adding and removing lines.
        insert: function (at, lines) {
            var height = 0;
            for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }
            this.insertInner(at - this.first, lines, height);
        },
        remove: function (at, n) { this.removeInner(at - this.first, n); },

        // From here, the methods are part of the public interface. Most
        // are also available from CodeMirror (editor) instances.

        getValue: function (lineSep) {
            var lines = getLines(this, this.first, this.first + this.size);
            if (lineSep === false) { return lines }
            return lines.join(lineSep || this.lineSeparator())
        },
        setValue: docMethodOp(function (code) {
            var top = Pos(this.first, 0), last = this.first + this.size - 1;
            makeChange(this, {
                from: top, to: Pos(last, getLine(this, last).text.length),
                text: this.splitLines(code), origin: "setValue", full: true
            }, true);
            if (this.cm) { scrollToCoords(this.cm, 0, 0); }
            setSelection(this, simpleSelection(top), sel_dontScroll);
        }),
        replaceRange: function (code, from, to, origin) {
            from = clipPos(this, from);
            to = to ? clipPos(this, to) : from;
            replaceRange(this, code, from, to, origin);
        },
        getRange: function (from, to, lineSep) {
            var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
            if (lineSep === false) { return lines }
            if (lineSep === '') { return lines.join('') }
            return lines.join(lineSep || this.lineSeparator())
        },

        getLine: function (line) { var l = this.getLineHandle(line); return l && l.text },

        getLineHandle: function (line) { if (isLine(this, line)) { return getLine(this, line) } },
        getLineNumber: function (line) { return lineNo(line) },

        getLineHandleVisualStart: function (line) {
            if (typeof line == "number") { line = getLine(this, line); }
            return visualLine(line)
        },

        lineCount: function () { return this.size },
        firstLine: function () { return this.first },
        lastLine: function () { return this.first + this.size - 1 },

        clipPos: function (pos) { return clipPos(this, pos) },

        getCursor: function (start) {
            var range = this.sel.primary(), pos;
            if (start == null || start == "head") { pos = range.head; }
            else if (start == "anchor") { pos = range.anchor; }
            else if (start == "end" || start == "to" || start === false) { pos = range.to(); }
            else { pos = range.from(); }
            return pos
        },
        listSelections: function () { return this.sel.ranges },
        somethingSelected: function () { return this.sel.somethingSelected() },

        setCursor: docMethodOp(function (line, ch, options) {
            setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
        }),
        setSelection: docMethodOp(function (anchor, head, options) {
            setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
        }),
        extendSelection: docMethodOp(function (head, other, options) {
            extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
        }),
        extendSelections: docMethodOp(function (heads, options) {
            extendSelections(this, clipPosArray(this, heads), options);
        }),
        extendSelectionsBy: docMethodOp(function (f, options) {
            var heads = map(this.sel.ranges, f);
            extendSelections(this, clipPosArray(this, heads), options);
        }),
        setSelections: docMethodOp(function (ranges, primary, options) {
            if (!ranges.length) { return }
            var out = [];
            for (var i = 0; i < ranges.length; i++) {
                out[i] = new Range(clipPos(this, ranges[i].anchor),
                    clipPos(this, ranges[i].head || ranges[i].anchor));
            }
            if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }
            setSelection(this, normalizeSelection(this.cm, out, primary), options);
        }),
        addSelection: docMethodOp(function (anchor, head, options) {
            var ranges = this.sel.ranges.slice(0);
            ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
            setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);
        }),

        getSelection: function (lineSep) {
            var ranges = this.sel.ranges, lines;
            for (var i = 0; i < ranges.length; i++) {
                var sel = getBetween(this, ranges[i].from(), ranges[i].to());
                lines = lines ? lines.concat(sel) : sel;
            }
            if (lineSep === false) { return lines }
            else { return lines.join(lineSep || this.lineSeparator()) }
        },
        getSelections: function (lineSep) {
            var parts = [], ranges = this.sel.ranges;
            for (var i = 0; i < ranges.length; i++) {
                var sel = getBetween(this, ranges[i].from(), ranges[i].to());
                if (lineSep !== false) { sel = sel.join(lineSep || this.lineSeparator()); }
                parts[i] = sel;
            }
            return parts
        },
        replaceSelection: function (code, collapse, origin) {
            var dup = [];
            for (var i = 0; i < this.sel.ranges.length; i++) { dup[i] = code; }
            this.replaceSelections(dup, collapse, origin || "+input");
        },
        replaceSelections: docMethodOp(function (code, collapse, origin) {
            var changes = [], sel = this.sel;
            for (var i = 0; i < sel.ranges.length; i++) {
                var range = sel.ranges[i];
                changes[i] = { from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin };
            }
            var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
            for (var i$1 = changes.length - 1; i$1 >= 0; i$1--) { makeChange(this, changes[i$1]); }
            if (newSel) { setSelectionReplaceHistory(this, newSel); }
            else if (this.cm) { ensureCursorVisible(this.cm); }
        }),
        undo: docMethodOp(function () { makeChangeFromHistory(this, "undo"); }),
        redo: docMethodOp(function () { makeChangeFromHistory(this, "redo"); }),
        undoSelection: docMethodOp(function () { makeChangeFromHistory(this, "undo", true); }),
        redoSelection: docMethodOp(function () { makeChangeFromHistory(this, "redo", true); }),

        setExtending: function (val) { this.extend = val; },
        getExtending: function () { return this.extend },

        historySize: function () {
            var hist = this.history, done = 0, undone = 0;
            for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }
            for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }
            return { undo: done, redo: undone }
        },
        clearHistory: function () {
            var this$1 = this;

            this.history = new History(this.history);
            linkedDocs(this, function (doc) { return doc.history = this$1.history; }, true);
        },

        markClean: function () {
            this.cleanGeneration = this.changeGeneration(true);
        },
        changeGeneration: function (forceSplit) {
            if (forceSplit) { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }
            return this.history.generation
        },
        isClean: function (gen) {
            return this.history.generation == (gen || this.cleanGeneration)
        },

        getHistory: function () {
            return {
                done: copyHistoryArray(this.history.done),
                undone: copyHistoryArray(this.history.undone)
            }
        },
        setHistory: function (histData) {
            var hist = this.history = new History(this.history);
            hist.done = copyHistoryArray(histData.done.slice(0), null, true);
            hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
        },

        setGutterMarker: docMethodOp(function (line, gutterID, value) {
            return changeLine(this, line, "gutter", function (line) {
                var markers = line.gutterMarkers || (line.gutterMarkers = {});
                markers[gutterID] = value;
                if (!value && isEmpty(markers)) { line.gutterMarkers = null; }
                return true
            })
        }),

        clearGutter: docMethodOp(function (gutterID) {
            var this$1 = this;

            this.iter(function (line) {
                if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
                    changeLine(this$1, line, "gutter", function () {
                        line.gutterMarkers[gutterID] = null;
                        if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }
                        return true
                    });
                }
            });
        }),

        lineInfo: function (line) {
            var n;
            if (typeof line == "number") {
                if (!isLine(this, line)) { return null }
                n = line;
                line = getLine(this, line);
                if (!line) { return null }
            } else {
                n = lineNo(line);
                if (n == null) { return null }
            }
            return {
                line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
                textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
                widgets: line.widgets
            }
        },

        addLineClass: docMethodOp(function (handle, where, cls) {
            return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
                var prop = where == "text" ? "textClass"
                    : where == "background" ? "bgClass"
                        : where == "gutter" ? "gutterClass" : "wrapClass";
                if (!line[prop]) { line[prop] = cls; }
                else if (classTest(cls).test(line[prop])) { return false }
                else { line[prop] += " " + cls; }
                return true
            })
        }),
        removeLineClass: docMethodOp(function (handle, where, cls) {
            return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
                var prop = where == "text" ? "textClass"
                    : where == "background" ? "bgClass"
                        : where == "gutter" ? "gutterClass" : "wrapClass";
                var cur = line[prop];
                if (!cur) { return false }
                else if (cls == null) { line[prop] = null; }
                else {
                    var found = cur.match(classTest(cls));
                    if (!found) { return false }
                    var end = found.index + found[0].length;
                    line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
                }
                return true
            })
        }),

        addLineWidget: docMethodOp(function (handle, node, options) {
            return addLineWidget(this, handle, node, options)
        }),
        removeLineWidget: function (widget) { widget.clear(); },

        markText: function (from, to, options) {
            return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
        },
        setBookmark: function (pos, options) {
            var realOpts = {
                replacedWith: options && (options.nodeType == null ? options.widget : options),
                insertLeft: options && options.insertLeft,
                clearWhenEmpty: false, shared: options && options.shared,
                handleMouseEvents: options && options.handleMouseEvents
            };
            pos = clipPos(this, pos);
            return markText(this, pos, pos, realOpts, "bookmark")
        },
        findMarksAt: function (pos) {
            pos = clipPos(this, pos);
            var markers = [], spans = getLine(this, pos.line).markedSpans;
            if (spans) {
                for (var i = 0; i < spans.length; ++i) {
                    var span = spans[i];
                    if ((span.from == null || span.from <= pos.ch) &&
                        (span.to == null || span.to >= pos.ch)) { markers.push(span.marker.parent || span.marker); }
                }
            }
            return markers
        },
        findMarks: function (from, to, filter) {
            from = clipPos(this, from); to = clipPos(this, to);
            var found = [], lineNo = from.line;
            this.iter(from.line, to.line + 1, function (line) {
                var spans = line.markedSpans;
                if (spans) {
                    for (var i = 0; i < spans.length; i++) {
                        var span = spans[i];
                        if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
                            span.from == null && lineNo != from.line ||
                            span.from != null && lineNo == to.line && span.from >= to.ch) &&
                            (!filter || filter(span.marker))) { found.push(span.marker.parent || span.marker); }
                    }
                }
                ++lineNo;
            });
            return found
        },
        getAllMarks: function () {
            var markers = [];
            this.iter(function (line) {
                var sps = line.markedSpans;
                if (sps) {
                    for (var i = 0; i < sps.length; ++i) { if (sps[i].from != null) { markers.push(sps[i].marker); } }
                }
            });
            return markers
        },

        posFromIndex: function (off) {
            var ch, lineNo = this.first, sepSize = this.lineSeparator().length;
            this.iter(function (line) {
                var sz = line.text.length + sepSize;
                if (sz > off) { ch = off; return true }
                off -= sz;
                ++lineNo;
            });
            return clipPos(this, Pos(lineNo, ch))
        },
        indexFromPos: function (coords) {
            coords = clipPos(this, coords);
            var index = coords.ch;
            if (coords.line < this.first || coords.ch < 0) { return 0 }
            var sepSize = this.lineSeparator().length;
            this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
                index += line.text.length + sepSize;
            });
            return index
        },

        copy: function (copyHistory) {
            var doc = new Doc(getLines(this, this.first, this.first + this.size),
                this.modeOption, this.first, this.lineSep, this.direction);
            doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
            doc.sel = this.sel;
            doc.extend = false;
            if (copyHistory) {
                doc.history.undoDepth = this.history.undoDepth;
                doc.setHistory(this.getHistory());
            }
            return doc
        },

        linkedDoc: function (options) {
            if (!options) { options = {}; }
            var from = this.first, to = this.first + this.size;
            if (options.from != null && options.from > from) { from = options.from; }
            if (options.to != null && options.to < to) { to = options.to; }
            var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
            if (options.sharedHist) {
                copy.history = this.history
                ;
            } (this.linked || (this.linked = [])).push({ doc: copy, sharedHist: options.sharedHist });
            copy.linked = [{ doc: this, isParent: true, sharedHist: options.sharedHist }];
            copySharedMarkers(copy, findSharedMarkers(this));
            return copy
        },
        unlinkDoc: function (other) {
            if (other instanceof CodeMirror) { other = other.doc; }
            if (this.linked) {
                for (var i = 0; i < this.linked.length; ++i) {
                    var link = this.linked[i];
                    if (link.doc != other) { continue }
                    this.linked.splice(i, 1);
                    other.unlinkDoc(this);
                    detachSharedMarkers(findSharedMarkers(this));
                    break
                }
            }
            // If the histories were shared, split them again
            if (other.history == this.history) {
                var splitIds = [other.id];
                linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);
                other.history = new History(null);
                other.history.done = copyHistoryArray(this.history.done, splitIds);
                other.history.undone = copyHistoryArray(this.history.undone, splitIds);
            }
        },
        iterLinkedDocs: function (f) { linkedDocs(this, f); },

        getMode: function () { return this.mode },
        getEditor: function () { return this.cm },

        splitLines: function (str) {
            if (this.lineSep) { return str.split(this.lineSep) }
            return splitLinesAuto(str)
        },
        lineSeparator: function () { return this.lineSep || "\n" },

        setDirection: docMethodOp(function (dir) {
            if (dir != "rtl") { dir = "ltr"; }
            if (dir == this.direction) { return }
            this.direction = dir;
            this.iter(function (line) { return line.order = null; });
            if (this.cm) { directionChanged(this.cm); }
        })
    });

    // Public alias.
    Doc.prototype.eachLine = Doc.prototype.iter;

    // Kludge to work around strange IE behavior where it'll sometimes
    // re-fire a series of drag-related events right after the drop (#1551)
    var lastDrop = 0;

    function onDrop(e) {
        var cm = this;
        clearDragCursor(cm);
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }
        e_preventDefault(e);
        if (ie) { lastDrop = +new Date; }
        var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
        if (!pos || cm.isReadOnly()) { return }
        // Might be a file drop, in which case we simply extract the text
        // and insert it.
        if (files && files.length && window.FileReader && window.File) {
            var n = files.length, text = Array(n), read = 0;
            var markAsReadAndPasteIfAllFilesAreRead = function () {
                if (++read == n) {
                    operation(cm, function () {
                        pos = clipPos(cm.doc, pos);
                        var change = {
                            from: pos, to: pos,
                            text: cm.doc.splitLines(
                                text.filter(function (t) { return t != null; }).join(cm.doc.lineSeparator())),
                            origin: "paste"
                        };
                        makeChange(cm.doc, change);
                        setSelectionReplaceHistory(cm.doc, simpleSelection(clipPos(cm.doc, pos), clipPos(cm.doc, changeEnd(change))));
                    })();
                }
            };
            var readTextFromFile = function (file, i) {
                if (cm.options.allowDropFileTypes &&
                    indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
                    markAsReadAndPasteIfAllFilesAreRead();
                    return
                }
                var reader = new FileReader;
                reader.onerror = function () { return markAsReadAndPasteIfAllFilesAreRead(); };
                reader.onload = function () {
                    var content = reader.result;
                    if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
                        markAsReadAndPasteIfAllFilesAreRead();
                        return
                    }
                    text[i] = content;
                    markAsReadAndPasteIfAllFilesAreRead();
                };
                reader.readAsText(file);
            };
            for (var i = 0; i < files.length; i++) { readTextFromFile(files[i], i); }
        } else { // Normal drop
            // Don't do a replace if the drop happened inside of the selected text.
            if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
                cm.state.draggingText(e);
                // Ensure the editor is re-focused
                setTimeout(function () { return cm.display.input.focus(); }, 20);
                return
            }
            try {
                var text$1 = e.dataTransfer.getData("Text");
                if (text$1) {
                    var selected;
                    if (cm.state.draggingText && !cm.state.draggingText.copy) { selected = cm.listSelections(); }
                    setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
                    if (selected) {
                        for (var i$1 = 0; i$1 < selected.length; ++i$1) { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag"); }
                    }
                    cm.replaceSelection(text$1, "around", "paste");
                    cm.display.input.focus();
                }
            }
            catch (e$1) { }
        }
    }

    function onDragStart(cm, e) {
        if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
        if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }

        e.dataTransfer.setData("Text", cm.getSelection());
        e.dataTransfer.effectAllowed = "copyMove";

        // Use dummy image instead of default browsers image.
        // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
        if (e.dataTransfer.setDragImage && !safari) {
            var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
            img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
            if (presto) {
                img.width = img.height = 1;
                cm.display.wrapper.appendChild(img);
                // Force a relayout, or Opera won't use our image for some obscure reason
                img._top = img.offsetTop;
            }
            e.dataTransfer.setDragImage(img, 0, 0);
            if (presto) { img.parentNode.removeChild(img); }
        }
    }

    function onDragOver(cm, e) {
        var pos = posFromMouse(cm, e);
        if (!pos) { return }
        var frag = document.createDocumentFragment();
        drawSelectionCursor(cm, pos, frag);
        if (!cm.display.dragCursor) {
            cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
            cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
        }
        removeChildrenAndAdd(cm.display.dragCursor, frag);
    }

    function clearDragCursor(cm) {
        if (cm.display.dragCursor) {
            cm.display.lineSpace.removeChild(cm.display.dragCursor);
            cm.display.dragCursor = null;
        }
    }

    // These must be handled carefully, because naively registering a
    // handler for each editor will cause the editors to never be
    // garbage collected.

    function forEachCodeMirror(f) {
        if (!document.getElementsByClassName) { return }
        var byClass = document.getElementsByClassName("CodeMirror"), editors = [];
        for (var i = 0; i < byClass.length; i++) {
            var cm = byClass[i].CodeMirror;
            if (cm) { editors.push(cm); }
        }
        if (editors.length) {
            editors[0].operation(function () {
                for (var i = 0; i < editors.length; i++) { f(editors[i]); }
            });
        }
    }

    var globalsRegistered = false;
    function ensureGlobalHandlers() {
        if (globalsRegistered) { return }
        registerGlobalHandlers();
        globalsRegistered = true;
    }
    function registerGlobalHandlers() {
        // When the window resizes, we need to refresh active editors.
        var resizeTimer;
        on(window, "resize", function () {
            if (resizeTimer == null) {
                resizeTimer = setTimeout(function () {
                    resizeTimer = null;
                    forEachCodeMirror(onResize);
                }, 100);
            }
        });
        // When the window loses focus, we want to show the editor as blurred
        on(window, "blur", function () { return forEachCodeMirror(onBlur); });
    }
    // Called when the window resizes
    function onResize(cm) {
        var d = cm.display;
        // Might be a text scaling operation, clear size caches.
        d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
        d.scrollbarsClipped = false;
        cm.setSize();
    }

    var keyNames = {
        3: "Pause", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
        19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
        36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
        46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
        106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 145: "ScrollLock",
        173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
        221: "]", 222: "'", 224: "Mod", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
        63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
    };

    // Number keys
    for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }
    // Alphabetic keys
    for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }
    // Function keys
    for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2; }

    var keyMap = {};

    keyMap.basic = {
        "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
        "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
        "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
        "Tab": "defaultTab", "Shift-Tab": "indentAuto",
        "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
        "Esc": "singleSelection"
    };
    // Note that the save and find-related commands aren't defined by
    // default. User code or addons can define them. Unknown commands
    // are simply ignored.
    keyMap.pcDefault = {
        "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
        "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
        "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
        "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
        "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
        "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
        "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
        "fallthrough": "basic"
    };
    // Very basic readline/emacs-style bindings, which are standard on Mac.
    keyMap.emacsy = {
        "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
        "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd", "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp",
        "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine",
        "Ctrl-T": "transposeChars", "Ctrl-O": "openLine"
    };
    keyMap.macDefault = {
        "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
        "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
        "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
        "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
        "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
        "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
        "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
        "fallthrough": ["basic", "emacsy"]
    };
    keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

    // KEYMAP DISPATCH

    function normalizeKeyName(name) {
        var parts = name.split(/-(?!$)/);
        name = parts[parts.length - 1];
        var alt, ctrl, shift, cmd;
        for (var i = 0; i < parts.length - 1; i++) {
            var mod = parts[i];
            if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }
            else if (/^a(lt)?$/i.test(mod)) { alt = true; }
            else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }
            else if (/^s(hift)?$/i.test(mod)) { shift = true; }
            else { throw new Error("Unrecognized modifier name: " + mod) }
        }
        if (alt) { name = "Alt-" + name; }
        if (ctrl) { name = "Ctrl-" + name; }
        if (cmd) { name = "Cmd-" + name; }
        if (shift) { name = "Shift-" + name; }
        return name
    }

    // This is a kludge to keep keymaps mostly working as raw objects
    // (backwards compatibility) while at the same time support features
    // like normalization and multi-stroke key bindings. It compiles a
    // new normalized keymap, and then updates the old object to reflect
    // this.
    function normalizeKeyMap(keymap) {
        var copy = {};
        for (var keyname in keymap) {
            if (keymap.hasOwnProperty(keyname)) {
                var value = keymap[keyname];
                if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
                if (value == "...") { delete keymap[keyname]; continue }

                var keys = map(keyname.split(" "), normalizeKeyName);
                for (var i = 0; i < keys.length; i++) {
                    var val = (void 0), name = (void 0);
                    if (i == keys.length - 1) {
                        name = keys.join(" ");
                        val = value;
                    } else {
                        name = keys.slice(0, i + 1).join(" ");
                        val = "...";
                    }
                    var prev = copy[name];
                    if (!prev) { copy[name] = val; }
                    else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
                }
                delete keymap[keyname];
            }
        }
        for (var prop in copy) { keymap[prop] = copy[prop]; }
        return keymap
    }

    function lookupKey(key, map, handle, context) {
        map = getKeyMap(map);
        var found = map.call ? map.call(key, context) : map[key];
        if (found === false) { return "nothing" }
        if (found === "...") { return "multi" }
        if (found != null && handle(found)) { return "handled" }

        if (map.fallthrough) {
            if (Object.prototype.toString.call(map.fallthrough) != "[object Array]") { return lookupKey(key, map.fallthrough, handle, context) }
            for (var i = 0; i < map.fallthrough.length; i++) {
                var result = lookupKey(key, map.fallthrough[i], handle, context);
                if (result) { return result }
            }
        }
    }

    // Modifier key presses don't count as 'real' key presses for the
    // purpose of keymap fallthrough.
    function isModifierKey(value) {
        var name = typeof value == "string" ? value : keyNames[value.keyCode];
        return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
    }

    function addModifierNames(name, event, noShift) {
        var base = name;
        if (event.altKey && base != "Alt") { name = "Alt-" + name; }
        if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name; }
        if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Mod") { name = "Cmd-" + name; }
        if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name; }
        return name
    }

    // Look up the name of a key as indicated by an event object.
    function keyName(event, noShift) {
        if (presto && event.keyCode == 34 && event["char"]) { return false }
        var name = keyNames[event.keyCode];
        if (name == null || event.altGraphKey) { return false }
        // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
        // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
        if (event.keyCode == 3 && event.code) { name = event.code; }
        return addModifierNames(name, event, noShift)
    }

    function getKeyMap(val) {
        return typeof val == "string" ? keyMap[val] : val
    }

    // Helper for deleting text near the selection(s), used to implement
    // backspace, delete, and similar functionality.
    function deleteNearSelection(cm, compute) {
        var ranges = cm.doc.sel.ranges, kill = [];
        // Build up a set of ranges to kill first, merging overlapping
        // ranges.
        for (var i = 0; i < ranges.length; i++) {
            var toKill = compute(ranges[i]);
            while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
                var replaced = kill.pop();
                if (cmp(replaced.from, toKill.from) < 0) {
                    toKill.from = replaced.from;
                    break
                }
            }
            kill.push(toKill);
        }
        // Next, remove those actual ranges.
        runInOp(cm, function () {
            for (var i = kill.length - 1; i >= 0; i--) { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete"); }
            ensureCursorVisible(cm);
        });
    }

    function moveCharLogically(line, ch, dir) {
        var target = skipExtendingChars(line.text, ch + dir, dir);
        return target < 0 || target > line.text.length ? null : target
    }

    function moveLogically(line, start, dir) {
        var ch = moveCharLogically(line, start.ch, dir);
        return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
    }

    function endOfLine(visually, cm, lineObj, lineNo, dir) {
        if (visually) {
            if (cm.doc.direction == "rtl") { dir = -dir; }
            var order = getOrder(lineObj, cm.doc.direction);
            if (order) {
                var part = dir < 0 ? lst(order) : order[0];
                var moveInStorageOrder = (dir < 0) == (part.level == 1);
                var sticky = moveInStorageOrder ? "after" : "before";
                var ch;
                // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
                // it could be that the last bidi part is not on the last visual line,
                // since visual lines contain content order-consecutive chunks.
                // Thus, in rtl, we are looking for the first (content-order) character
                // in the rtl chunk that is on the last line (that is, the same line
                // as the last (content-order) character).
                if (part.level > 0 || cm.doc.direction == "rtl") {
                    var prep = prepareMeasureForLine(cm, lineObj);
                    ch = dir < 0 ? lineObj.text.length - 1 : 0;
                    var targetTop = measureCharPrepared(cm, prep, ch).top;
                    ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
                    if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1); }
                } else { ch = dir < 0 ? part.to : part.from; }
                return new Pos(lineNo, ch, sticky)
            }
        }
        return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
    }

    function moveVisually(cm, line, start, dir) {
        var bidi = getOrder(line, cm.doc.direction);
        if (!bidi) { return moveLogically(line, start, dir) }
        if (start.ch >= line.text.length) {
            start.ch = line.text.length;
            start.sticky = "before";
        } else if (start.ch <= 0) {
            start.ch = 0;
            start.sticky = "after";
        }
        var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];
        if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
            // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
            // nothing interesting happens.
            return moveLogically(line, start, dir)
        }

        var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };
        var prep;
        var getWrappedLineExtent = function (ch) {
            if (!cm.options.lineWrapping) { return { begin: 0, end: line.text.length } }
            prep = prep || prepareMeasureForLine(cm, line);
            return wrappedLineExtentChar(cm, line, prep, ch)
        };
        var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);

        if (cm.doc.direction == "rtl" || part.level == 1) {
            var moveInStorageOrder = (part.level == 1) == (dir < 0);
            var ch = mv(start, moveInStorageOrder ? 1 : -1);
            if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
                // Case 2: We move within an rtl part or in an rtl editor on the same visual line
                var sticky = moveInStorageOrder ? "before" : "after";
                return new Pos(start.line, ch, sticky)
            }
        }

        // Case 3: Could not move within this bidi part in this visual line, so leave
        // the current bidi part

        var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
            var getRes = function (ch, moveInStorageOrder) {
                return moveInStorageOrder
                    ? new Pos(start.line, mv(ch, 1), "before")
                    : new Pos(start.line, ch, "after");
            };

            for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
                var part = bidi[partPos];
                var moveInStorageOrder = (dir > 0) == (part.level != 1);
                var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
                if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
                ch = moveInStorageOrder ? part.from : mv(part.to, -1);
                if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
            }
        };

        // Case 3a: Look for other bidi parts on the same visual line
        var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
        if (res) { return res }

        // Case 3b: Look for other bidi parts on the next visual line
        var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
        if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
            res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
            if (res) { return res }
        }

        // Case 4: Nowhere to move
        return null
    }

    // Commands are parameter-less actions that can be performed on an
    // editor, mostly used for keybindings.
    var commands = {
        selectAll: selectAll,
        singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
        killLine: function (cm) {
            return deleteNearSelection(cm, function (range) {
                if (range.empty()) {
                    var len = getLine(cm.doc, range.head.line).text.length;
                    if (range.head.ch == len && range.head.line < cm.lastLine()) { return { from: range.head, to: Pos(range.head.line + 1, 0) } }
                    else { return { from: range.head, to: Pos(range.head.line, len) } }
                } else {
                    return { from: range.from(), to: range.to() }
                }
            });
        },
        deleteLine: function (cm) {
            return deleteNearSelection(cm, function (range) {
                return ({
                    from: Pos(range.from().line, 0),
                    to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
                });
            });
        },
        delLineLeft: function (cm) {
            return deleteNearSelection(cm, function (range) {
                return ({
                    from: Pos(range.from().line, 0), to: range.from()
                });
            });
        },
        delWrappedLineLeft: function (cm) {
            return deleteNearSelection(cm, function (range) {
                var top = cm.charCoords(range.head, "div").top + 5;
                var leftPos = cm.coordsChar({ left: 0, top: top }, "div");
                return { from: leftPos, to: range.from() }
            });
        },
        delWrappedLineRight: function (cm) {
            return deleteNearSelection(cm, function (range) {
                var top = cm.charCoords(range.head, "div").top + 5;
                var rightPos = cm.coordsChar({ left: cm.display.lineDiv.offsetWidth + 100, top: top }, "div");
                return { from: range.from(), to: rightPos }
            });
        },
        undo: function (cm) { return cm.undo(); },
        redo: function (cm) { return cm.redo(); },
        undoSelection: function (cm) { return cm.undoSelection(); },
        redoSelection: function (cm) { return cm.redoSelection(); },
        goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
        goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
        goLineStart: function (cm) {
            return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
                { origin: "+move", bias: 1 }
            );
        },
        goLineStartSmart: function (cm) {
            return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
                { origin: "+move", bias: 1 }
            );
        },
        goLineEnd: function (cm) {
            return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
                { origin: "+move", bias: -1 }
            );
        },
        goLineRight: function (cm) {
            return cm.extendSelectionsBy(function (range) {
                var top = cm.cursorCoords(range.head, "div").top + 5;
                return cm.coordsChar({ left: cm.display.lineDiv.offsetWidth + 100, top: top }, "div")
            }, sel_move);
        },
        goLineLeft: function (cm) {
            return cm.extendSelectionsBy(function (range) {
                var top = cm.cursorCoords(range.head, "div").top + 5;
                return cm.coordsChar({ left: 0, top: top }, "div")
            }, sel_move);
        },
        goLineLeftSmart: function (cm) {
            return cm.extendSelectionsBy(function (range) {
                var top = cm.cursorCoords(range.head, "div").top + 5;
                var pos = cm.coordsChar({ left: 0, top: top }, "div");
                if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
                return pos
            }, sel_move);
        },
        goLineUp: function (cm) { return cm.moveV(-1, "line"); },
        goLineDown: function (cm) { return cm.moveV(1, "line"); },
        goPageUp: function (cm) { return cm.moveV(-1, "page"); },
        goPageDown: function (cm) { return cm.moveV(1, "page"); },
        goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
        goCharRight: function (cm) { return cm.moveH(1, "char"); },
        goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
        goColumnRight: function (cm) { return cm.moveH(1, "column"); },
        goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
        goGroupRight: function (cm) { return cm.moveH(1, "group"); },
        goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
        goWordRight: function (cm) { return cm.moveH(1, "word"); },
        delCharBefore: function (cm) { return cm.deleteH(-1, "codepoint"); },
        delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
        delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
        delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
        delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
        delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
        indentAuto: function (cm) { return cm.indentSelection("smart"); },
        indentMore: function (cm) { return cm.indentSelection("add"); },
        indentLess: function (cm) { return cm.indentSelection("subtract"); },
        insertTab: function (cm) { return cm.replaceSelection("\t"); },
        insertSoftTab: function (cm) {
            var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
            for (var i = 0; i < ranges.length; i++) {
                var pos = ranges[i].from();
                var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
                spaces.push(spaceStr(tabSize - col % tabSize));
            }
            cm.replaceSelections(spaces);
        },
        defaultTab: function (cm) {
            if (cm.somethingSelected()) { cm.indentSelection("add"); }
            else { cm.execCommand("insertTab"); }
        },
        // Swap the two chars left and right of each selection's head.
        // Move cursor behind the two swapped characters afterwards.
        //
        // Doesn't consider line feeds a character.
        // Doesn't scan more than one line above to find a character.
        // Doesn't do anything on an empty line.
        // Doesn't do anything with non-empty selections.
        transposeChars: function (cm) {
            return runInOp(cm, function () {
                var ranges = cm.listSelections(), newSel = [];
                for (var i = 0; i < ranges.length; i++) {
                    if (!ranges[i].empty()) { continue }
                    var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
                    if (line) {
                        if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }
                        if (cur.ch > 0) {
                            cur = new Pos(cur.line, cur.ch + 1);
                            cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                                Pos(cur.line, cur.ch - 2), cur, "+transpose");
                        } else if (cur.line > cm.doc.first) {
                            var prev = getLine(cm.doc, cur.line - 1).text;
                            if (prev) {
                                cur = new Pos(cur.line, 1);
                                cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
                                    prev.charAt(prev.length - 1),
                                    Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
                            }
                        }
                    }
                    newSel.push(new Range(cur, cur));
                }
                cm.setSelections(newSel);
            });
        },
        newlineAndIndent: function (cm) {
            return runInOp(cm, function () {
                var sels = cm.listSelections();
                for (var i = sels.length - 1; i >= 0; i--) { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input"); }
                sels = cm.listSelections();
                for (var i$1 = 0; i$1 < sels.length; i$1++) { cm.indentLine(sels[i$1].from().line, null, true); }
                ensureCursorVisible(cm);
            });
        },
        openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
        toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
    };


    function lineStart(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLine(line);
        if (visual != line) { lineN = lineNo(visual); }
        return endOfLine(true, cm, visual, lineN, 1)
    }
    function lineEnd(cm, lineN) {
        var line = getLine(cm.doc, lineN);
        var visual = visualLineEnd(line);
        if (visual != line) { lineN = lineNo(visual); }
        return endOfLine(true, cm, line, lineN, -1)
    }
    function lineStartSmart(cm, pos) {
        var start = lineStart(cm, pos.line);
        var line = getLine(cm.doc, start.line);
        var order = getOrder(line, cm.doc.direction);
        if (!order || order[0].level == 0) {
            var firstNonWS = Math.max(start.ch, line.text.search(/\S/));
            var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
            return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
        }
        return start
    }

    // Run a handler that was bound to a key.
    function doHandleBinding(cm, bound, dropShift) {
        if (typeof bound == "string") {
            bound = commands[bound];
            if (!bound) { return false }
        }
        // Ensure previous input has been read, so that the handler sees a
        // consistent view of the document
        cm.display.input.ensurePolled();
        var prevShift = cm.display.shift, done = false;
        try {
            if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
            if (dropShift) { cm.display.shift = false; }
            done = bound(cm) != Pass;
        } finally {
            cm.display.shift = prevShift;
            cm.state.suppressEdits = false;
        }
        return done
    }

    function lookupKeyForEditor(cm, name, handle) {
        for (var i = 0; i < cm.state.keyMaps.length; i++) {
            var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
            if (result) { return result }
        }
        return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
            || lookupKey(name, cm.options.keyMap, handle, cm)
    }

    // Note that, despite the name, this function is also used to check
    // for bound mouse clicks.

    var stopSeq = new Delayed;

    function dispatchKey(cm, name, e, handle) {
        var seq = cm.state.keySeq;
        if (seq) {
            if (isModifierKey(name)) { return "handled" }
            if (/\'$/.test(name)) { cm.state.keySeq = null; }
            else {
                stopSeq.set(50, function () {
                    if (cm.state.keySeq == seq) {
                        cm.state.keySeq = null;
                        cm.display.input.reset();
                    }
                });
            }
            if (dispatchKeyInner(cm, seq + " " + name, e, handle)) { return true }
        }
        return dispatchKeyInner(cm, name, e, handle)
    }

    function dispatchKeyInner(cm, name, e, handle) {
        var result = lookupKeyForEditor(cm, name, handle);

        if (result == "multi") { cm.state.keySeq = name; }
        if (result == "handled") { signalLater(cm, "keyHandled", cm, name, e); }

        if (result == "handled" || result == "multi") {
            e_preventDefault(e);
            restartBlink(cm);
        }

        return !!result
    }

    // Handle a key from the keydown event.
    function handleKeyBinding(cm, e) {
        var name = keyName(e, true);
        if (!name) { return false }

        if (e.shiftKey && !cm.state.keySeq) {
            // First try to resolve full name (including 'Shift-'). Failing
            // that, see if there is a cursor-motion command (starting with
            // 'go') bound to the keyname without 'Shift-'.
            return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
                || dispatchKey(cm, name, e, function (b) {
                    if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion) { return doHandleBinding(cm, b) }
                })
        } else {
            return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
        }
    }

    // Handle a key from the keypress event
    function handleCharBinding(cm, e, ch) {
        return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
    }

    var lastStoppedKey = null;
    function onKeyDown(e) {
        var cm = this;
        if (e.target && e.target != cm.display.input.getField()) { return }
        cm.curOp.focus = activeElt(doc(cm));
        if (signalDOMEvent(cm, e)) { return }
        // IE does strange things with escape.
        if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }
        var code = e.keyCode;
        cm.display.shift = code == 16 || e.shiftKey;
        var handled = handleKeyBinding(cm, e);
        if (presto) {
            lastStoppedKey = handled ? code : null;
            // Opera has no cut event... we try to at least catch the key combo
            if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey)) { cm.replaceSelection("", null, "cut"); }
        }
        if (gecko && !mac && !handled && code == 46 && e.shiftKey && !e.ctrlKey && document.execCommand) { document.execCommand("cut"); }

        // Turn mouse into crosshair when Alt is held on Mac.
        if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className)) { showCrossHair(cm); }
    }

    function showCrossHair(cm) {
        var lineDiv = cm.display.lineDiv;
        addClass(lineDiv, "CodeMirror-crosshair");

        function up(e) {
            if (e.keyCode == 18 || !e.altKey) {
                rmClass(lineDiv, "CodeMirror-crosshair");
                off(document, "keyup", up);
                off(document, "mouseover", up);
            }
        }
        on(document, "keyup", up);
        on(document, "mouseover", up);
    }

    function onKeyUp(e) {
        if (e.keyCode == 16) { this.doc.sel.shift = false; }
        signalDOMEvent(this, e);
    }

    function onKeyPress(e) {
        var cm = this;
        if (e.target && e.target != cm.display.input.getField()) { return }
        if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
        var keyCode = e.keyCode, charCode = e.charCode;
        if (presto && keyCode == lastStoppedKey) { lastStoppedKey = null; e_preventDefault(e); return }
        if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
        var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
        // Some browsers fire keypress events for backspace
        if (ch == "\x08") { return }
        if (handleCharBinding(cm, e, ch)) { return }
        cm.display.input.onKeyPress(e);
    }

    var DOUBLECLICK_DELAY = 400;

    var PastClick = function (time, pos, button) {
        this.time = time;
        this.pos = pos;
        this.button = button;
    };

    PastClick.prototype.compare = function (time, pos, button) {
        return this.time + DOUBLECLICK_DELAY > time &&
            cmp(pos, this.pos) == 0 && button == this.button
    };

    var lastClick, lastDoubleClick;
    function clickRepeat(pos, button) {
        var now = +new Date;
        if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
            lastClick = lastDoubleClick = null;
            return "triple"
        } else if (lastClick && lastClick.compare(now, pos, button)) {
            lastDoubleClick = new PastClick(now, pos, button);
            lastClick = null;
            return "double"
        } else {
            lastClick = new PastClick(now, pos, button);
            lastDoubleClick = null;
            return "single"
        }
    }

    // A mouse down can be a single click, double click, triple click,
    // start of selection drag, start of text drag, new cursor
    // (ctrl-click), rectangle drag (alt-drag), or xwin
    // middle-click-paste. Or it might be a click on something we should
    // not interfere with, such as a scrollbar or widget.
    function onMouseDown(e) {
        var cm = this, display = cm.display;
        if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
        display.input.ensurePolled();
        display.shift = e.shiftKey;

        if (eventInWidget(display, e)) {
            if (!webkit) {
                // Briefly turn off draggability, to allow widgets to do
                // normal dragging things.
                display.scroller.draggable = false;
                setTimeout(function () { return display.scroller.draggable = true; }, 100);
            }
            return
        }
        if (clickInGutter(cm, e)) { return }
        var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single";
        win(cm).focus();

        // #3261: make sure, that we're not starting a second selection
        if (button == 1 && cm.state.selectingText) { cm.state.selectingText(e); }

        if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }

        if (button == 1) {
            if (pos) { leftButtonDown(cm, pos, repeat, e); }
            else if (e_target(e) == display.scroller) { e_preventDefault(e); }
        } else if (button == 2) {
            if (pos) { extendSelection(cm.doc, pos); }
            setTimeout(function () { return display.input.focus(); }, 20);
        } else if (button == 3) {
            if (captureRightClick) { cm.display.input.onContextMenu(e); }
            else { delayBlurEvent(cm); }
        }
    }

    function handleMappedButton(cm, button, pos, repeat, event) {
        var name = "Click";
        if (repeat == "double") { name = "Double" + name; }
        else if (repeat == "triple") { name = "Triple" + name; }
        name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

        return dispatchKey(cm, addModifierNames(name, event), event, function (bound) {
            if (typeof bound == "string") { bound = commands[bound]; }
            if (!bound) { return false }
            var done = false;
            try {
                if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
                done = bound(cm, pos) != Pass;
            } finally {
                cm.state.suppressEdits = false;
            }
            return done
        })
    }

    function configureMouse(cm, repeat, event) {
        var option = cm.getOption("configureMouse");
        var value = option ? option(cm, repeat, event) : {};
        if (value.unit == null) {
            var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
            value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
        }
        if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }
        if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }
        if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }
        return value
    }

    function leftButtonDown(cm, pos, repeat, event) {
        if (ie) { setTimeout(bind(ensureFocus, cm), 0); }
        else { cm.curOp.focus = activeElt(doc(cm)); }

        var behavior = configureMouse(cm, repeat, event);

        var sel = cm.doc.sel, contained;
        if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
            repeat == "single" && (contained = sel.contains(pos)) > -1 &&
            (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
            (cmp(contained.to(), pos) > 0 || pos.xRel < 0)) { leftButtonStartDrag(cm, event, pos, behavior); }
        else { leftButtonSelect(cm, event, pos, behavior); }
    }

    // Start a text drag. When it ends, see if any dragging actually
    // happen, and treat as a click if it didn't.
    function leftButtonStartDrag(cm, event, pos, behavior) {
        var display = cm.display, moved = false;
        var dragEnd = operation(cm, function (e) {
            if (webkit) { display.scroller.draggable = false; }
            cm.state.draggingText = false;
            if (cm.state.delayingBlurEvent) {
                if (cm.hasFocus()) { cm.state.delayingBlurEvent = false; }
                else { delayBlurEvent(cm); }
            }
            off(display.wrapper.ownerDocument, "mouseup", dragEnd);
            off(display.wrapper.ownerDocument, "mousemove", mouseMove);
            off(display.scroller, "dragstart", dragStart);
            off(display.scroller, "drop", dragEnd);
            if (!moved) {
                e_preventDefault(e);
                if (!behavior.addNew) { extendSelection(cm.doc, pos, null, null, behavior.extend); }
                // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
                if ((webkit && !safari) || ie && ie_version == 9) { setTimeout(function () { display.wrapper.ownerDocument.body.focus({ preventScroll: true }); display.input.focus(); }, 20); }
                else { display.input.focus(); }
            }
        });
        var mouseMove = function (e2) {
            moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
        };
        var dragStart = function () { return moved = true; };
        // Let the drag handler handle this.
        if (webkit) { display.scroller.draggable = true; }
        cm.state.draggingText = dragEnd;
        dragEnd.copy = !behavior.moveOnDrag;
        on(display.wrapper.ownerDocument, "mouseup", dragEnd);
        on(display.wrapper.ownerDocument, "mousemove", mouseMove);
        on(display.scroller, "dragstart", dragStart);
        on(display.scroller, "drop", dragEnd);

        cm.state.delayingBlurEvent = true;
        setTimeout(function () { return display.input.focus(); }, 20);
        // IE's approach to draggable
        if (display.scroller.dragDrop) { display.scroller.dragDrop(); }
    }

    function rangeForUnit(cm, pos, unit) {
        if (unit == "char") { return new Range(pos, pos) }
        if (unit == "word") { return cm.findWordAt(pos) }
        if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
        var result = unit(cm, pos);
        return new Range(result.from, result.to)
    }

    // Normal selection, as opposed to text dragging.
    function leftButtonSelect(cm, event, start, behavior) {
        if (ie) { delayBlurEvent(cm); }
        var display = cm.display, doc$1 = cm.doc;
        e_preventDefault(event);

        var ourRange, ourIndex, startSel = doc$1.sel, ranges = startSel.ranges;
        if (behavior.addNew && !behavior.extend) {
            ourIndex = doc$1.sel.contains(start);
            if (ourIndex > -1) { ourRange = ranges[ourIndex]; }
            else { ourRange = new Range(start, start); }
        } else {
            ourRange = doc$1.sel.primary();
            ourIndex = doc$1.sel.primIndex;
        }

        if (behavior.unit == "rectangle") {
            if (!behavior.addNew) { ourRange = new Range(start, start); }
            start = posFromMouse(cm, event, true, true);
            ourIndex = -1;
        } else {
            var range = rangeForUnit(cm, start, behavior.unit);
            if (behavior.extend) { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend); }
            else { ourRange = range; }
        }

        if (!behavior.addNew) {
            ourIndex = 0;
            setSelection(doc$1, new Selection([ourRange], 0), sel_mouse);
            startSel = doc$1.sel;
        } else if (ourIndex == -1) {
            ourIndex = ranges.length;
            setSelection(doc$1, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),
                { scroll: false, origin: "*mouse" });
        } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
            setSelection(doc$1, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
                { scroll: false, origin: "*mouse" });
            startSel = doc$1.sel;
        } else {
            replaceOneSelection(doc$1, ourIndex, ourRange, sel_mouse);
        }

        var lastPos = start;
        function extendTo(pos) {
            if (cmp(lastPos, pos) == 0) { return }
            lastPos = pos;

            if (behavior.unit == "rectangle") {
                var ranges = [], tabSize = cm.options.tabSize;
                var startCol = countColumn(getLine(doc$1, start.line).text, start.ch, tabSize);
                var posCol = countColumn(getLine(doc$1, pos.line).text, pos.ch, tabSize);
                var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
                for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
                    line <= end; line++) {
                    var text = getLine(doc$1, line).text, leftPos = findColumn(text, left, tabSize);
                    if (left == right) { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }
                    else if (text.length > leftPos) { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }
                }
                if (!ranges.length) { ranges.push(new Range(start, start)); }
                setSelection(doc$1, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
                    { origin: "*mouse", scroll: false });
                cm.scrollIntoView(pos);
            } else {
                var oldRange = ourRange;
                var range = rangeForUnit(cm, pos, behavior.unit);
                var anchor = oldRange.anchor, head;
                if (cmp(range.anchor, anchor) > 0) {
                    head = range.head;
                    anchor = minPos(oldRange.from(), range.anchor);
                } else {
                    head = range.anchor;
                    anchor = maxPos(oldRange.to(), range.head);
                }
                var ranges$1 = startSel.ranges.slice(0);
                ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc$1, anchor), head));
                setSelection(doc$1, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);
            }
        }

        var editorSize = display.wrapper.getBoundingClientRect();
        // Used to ensure timeout re-tries don't fire when another extend
        // happened in the meantime (clearTimeout isn't reliable -- at
        // least on Chrome, the timeouts still happen even when cleared,
        // if the clear happens after their scheduled firing time).
        var counter = 0;

        function extend(e) {
            var curCount = ++counter;
            var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
            if (!cur) { return }
            if (cmp(cur, lastPos) != 0) {
                cm.curOp.focus = activeElt(doc(cm));
                extendTo(cur);
                var visible = visibleLines(display, doc$1);
                if (cur.line >= visible.to || cur.line < visible.from) { setTimeout(operation(cm, function () { if (counter == curCount) { extend(e); } }), 150); }
            } else {
                var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
                if (outside) {
                    setTimeout(operation(cm, function () {
                        if (counter != curCount) { return }
                        display.scroller.scrollTop += outside;
                        extend(e);
                    }), 50);
                }
            }
        }

        function done(e) {
            cm.state.selectingText = false;
            counter = Infinity;
            // If e is null or undefined we interpret this as someone trying
            // to explicitly cancel the selection rather than the user
            // letting go of the mouse button.
            if (e) {
                e_preventDefault(e);
                display.input.focus();
            }
            off(display.wrapper.ownerDocument, "mousemove", move);
            off(display.wrapper.ownerDocument, "mouseup", up);
            doc$1.history.lastSelOrigin = null;
        }

        var move = operation(cm, function (e) {
            if (e.buttons === 0 || !e_button(e)) { done(e); }
            else { extend(e); }
        });
        var up = operation(cm, done);
        cm.state.selectingText = up;
        on(display.wrapper.ownerDocument, "mousemove", move);
        on(display.wrapper.ownerDocument, "mouseup", up);
    }

    // Used when mouse-selecting to adjust the anchor to the proper side
    // of a bidi jump depending on the visual position of the head.
    function bidiSimplify(cm, range) {
        var anchor = range.anchor;
        var head = range.head;
        var anchorLine = getLine(cm.doc, anchor.line);
        if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }
        var order = getOrder(anchorLine);
        if (!order) { return range }
        var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];
        if (part.from != anchor.ch && part.to != anchor.ch) { return range }
        var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
        if (boundary == 0 || boundary == order.length) { return range }

        // Compute the relative visual position of the head compared to the
        // anchor (<0 is to the left, >0 to the right)
        var leftSide;
        if (head.line != anchor.line) {
            leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
        } else {
            var headIndex = getBidiPartAt(order, head.ch, head.sticky);
            var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
            if (headIndex == boundary - 1 || headIndex == boundary) { leftSide = dir < 0; }
            else { leftSide = dir > 0; }
        }

        var usePart = order[boundary + (leftSide ? -1 : 0)];
        var from = leftSide == (usePart.level == 1);
        var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before";
        return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)
    }


    // Determines whether an event happened in the gutter, and fires the
    // handlers for the corresponding event.
    function gutterEvent(cm, e, type, prevent) {
        var mX, mY;
        if (e.touches) {
            mX = e.touches[0].clientX;
            mY = e.touches[0].clientY;
        } else {
            try { mX = e.clientX; mY = e.clientY; }
            catch (e$1) { return false }
        }
        if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
        if (prevent) { e_preventDefault(e); }

        var display = cm.display;
        var lineBox = display.lineDiv.getBoundingClientRect();

        if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
        mY -= lineBox.top - display.viewOffset;

        for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {
            var g = display.gutters.childNodes[i];
            if (g && g.getBoundingClientRect().right >= mX) {
                var line = lineAtHeight(cm.doc, mY);
                var gutter = cm.display.gutterSpecs[i];
                signal(cm, type, cm, line, gutter.className, e);
                return e_defaultPrevented(e)
            }
        }
    }

    function clickInGutter(cm, e) {
        return gutterEvent(cm, e, "gutterClick", true)
    }

    // CONTEXT MENU HANDLING

    // To make the context menu work, we need to briefly unhide the
    // textarea (making it as unobtrusive as possible) to let the
    // right-click take effect on it.
    function onContextMenu(cm, e) {
        if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
        if (signalDOMEvent(cm, e, "contextmenu")) { return }
        if (!captureRightClick) { cm.display.input.onContextMenu(e); }
    }

    function contextMenuInGutter(cm, e) {
        if (!hasHandler(cm, "gutterContextMenu")) { return false }
        return gutterEvent(cm, e, "gutterContextMenu", false)
    }

    function themeChanged(cm) {
        cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
            cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
        clearCaches(cm);
    }

    var Init = { toString: function () { return "CodeMirror.Init" } };

    var defaults = {};
    var optionHandlers = {};

    function defineOptions(CodeMirror) {
        var optionHandlers = CodeMirror.optionHandlers;

        function option(name, deflt, handle, notOnInit) {
            CodeMirror.defaults[name] = deflt;
            if (handle) {
                optionHandlers[name] =
                notOnInit ? function (cm, val, old) { if (old != Init) { handle(cm, val, old); } } : handle;
            }
        }

        CodeMirror.defineOption = option;

        // Passed to option handlers when there is no old value.
        CodeMirror.Init = Init;

        // These two are, on init, called from the constructor because they
        // have to be initialized before the editor can start at all.
        option("value", "", function (cm, val) { return cm.setValue(val); }, true);
        option("mode", null, function (cm, val) {
            cm.doc.modeOption = val;
            loadMode(cm);
        }, true);

        option("indentUnit", 2, loadMode, true);
        option("indentWithTabs", false);
        option("smartIndent", true);
        option("tabSize", 4, function (cm) {
            resetModeState(cm);
            clearCaches(cm);
            regChange(cm);
        }, true);

        option("lineSeparator", null, function (cm, val) {
            cm.doc.lineSep = val;
            if (!val) { return }
            var newBreaks = [], lineNo = cm.doc.first;
            cm.doc.iter(function (line) {
                for (var pos = 0; ;) {
                    var found = line.text.indexOf(val, pos);
                    if (found == -1) { break }
                    pos = found + val.length;
                    newBreaks.push(Pos(lineNo, found));
                }
                lineNo++;
            });
            for (var i = newBreaks.length - 1; i >= 0; i--) { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }
        });
        option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b\u200e\u200f\u2028\u2029\ufeff\ufff9-\ufffc]/g, function (cm, val, old) {
            cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
            if (old != Init) { cm.refresh(); }
        });
        option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);
        option("electricChars", true);
        option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
            throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
        }, true);
        option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);
        option("autocorrect", false, function (cm, val) { return cm.getInputField().autocorrect = val; }, true);
        option("autocapitalize", false, function (cm, val) { return cm.getInputField().autocapitalize = val; }, true);
        option("rtlMoveVisually", !windows);
        option("wholeLineUpdateBefore", true);

        option("theme", "default", function (cm) {
            themeChanged(cm);
            updateGutters(cm);
        }, true);
        option("keyMap", "default", function (cm, val, old) {
            var next = getKeyMap(val);
            var prev = old != Init && getKeyMap(old);
            if (prev && prev.detach) { prev.detach(cm, next); }
            if (next.attach) { next.attach(cm, prev || null); }
        });
        option("extraKeys", null);
        option("configureMouse", null);

        option("lineWrapping", false, wrappingChanged, true);
        option("gutters", [], function (cm, val) {
            cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);
            updateGutters(cm);
        }, true);
        option("fixedGutter", true, function (cm, val) {
            cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
            cm.refresh();
        }, true);
        option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true);
        option("scrollbarStyle", "native", function (cm) {
            initScrollbars(cm);
            updateScrollbars(cm);
            cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
            cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
        }, true);
        option("lineNumbers", false, function (cm, val) {
            cm.display.gutterSpecs = getGutters(cm.options.gutters, val);
            updateGutters(cm);
        }, true);
        option("firstLineNumber", 1, updateGutters, true);
        option("lineNumberFormatter", function (integer) { return integer; }, updateGutters, true);
        option("showCursorWhenSelecting", false, updateSelection, true);

        option("resetSelectionOnContextMenu", true);
        option("lineWiseCopyCut", true);
        option("pasteLinesPerSelection", true);
        option("selectionsMayTouch", false);

        option("readOnly", false, function (cm, val) {
            if (val == "nocursor") {
                onBlur(cm);
                cm.display.input.blur();
            }
            cm.display.input.readOnlyChanged(val);
        });

        option("screenReaderLabel", null, function (cm, val) {
            val = (val === '') ? null : val;
            cm.display.input.screenReaderLabelChanged(val);
        });

        option("disableInput", false, function (cm, val) { if (!val) { cm.display.input.reset(); } }, true);
        option("dragDrop", true, dragDropChanged);
        option("allowDropFileTypes", null);

        option("cursorBlinkRate", 530);
        option("cursorScrollMargin", 0);
        option("cursorHeight", 1, updateSelection, true);
        option("singleCursorHeightPerLine", true, updateSelection, true);
        option("workTime", 100);
        option("workDelay", 100);
        option("flattenSpans", true, resetModeState, true);
        option("addModeClass", false, resetModeState, true);
        option("pollInterval", 100);
        option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });
        option("historyEventDelay", 1250);
        option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true);
        option("maxHighlightLength", 10000, resetModeState, true);
        option("moveInputWithCursor", true, function (cm, val) {
            if (!val) { cm.display.input.resetPosition(); }
        });

        option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; });
        option("autofocus", null);
        option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true);
        option("phrases", null);
    }

    function dragDropChanged(cm, value, old) {
        var wasOn = old && old != Init;
        if (!value != !wasOn) {
            var funcs = cm.display.dragFunctions;
            var toggle = value ? on : off;
            toggle(cm.display.scroller, "dragstart", funcs.start);
            toggle(cm.display.scroller, "dragenter", funcs.enter);
            toggle(cm.display.scroller, "dragover", funcs.over);
            toggle(cm.display.scroller, "dragleave", funcs.leave);
            toggle(cm.display.scroller, "drop", funcs.drop);
        }
    }

    function wrappingChanged(cm) {
        if (cm.options.lineWrapping) {
            addClass(cm.display.wrapper, "CodeMirror-wrap");
            cm.display.sizer.style.minWidth = "";
            cm.display.sizerWidth = null;
        } else {
            rmClass(cm.display.wrapper, "CodeMirror-wrap");
            findMaxLine(cm);
        }
        estimateLineHeights(cm);
        regChange(cm);
        clearCaches(cm);
        setTimeout(function () { return updateScrollbars(cm); }, 100);
    }

    // A CodeMirror instance represents an editor. This is the object
    // that user code is usually dealing with.

    function CodeMirror(place, options) {
        var this$1 = this;

        if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }

        this.options = options = options ? copyObj(options) : {};
        // Determine effective options based on given values and defaults.
        copyObj(defaults, options, false);

        var doc = options.value;
        if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }
        else if (options.mode) { doc.modeOption = options.mode; }
        this.doc = doc;

        var input = new CodeMirror.inputStyles[options.inputStyle](this);
        var display = this.display = new Display(place, doc, input, options);
        display.wrapper.CodeMirror = this;
        themeChanged(this);
        if (options.lineWrapping) { this.display.wrapper.className += " CodeMirror-wrap"; }
        initScrollbars(this);

        this.state = {
            keyMaps: [],  // stores maps added by addKeyMap
            overlays: [], // highlighting overlays, as added by addOverlay
            modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
            overwrite: false,
            delayingBlurEvent: false,
            focused: false,
            suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
            pasteIncoming: -1, cutIncoming: -1, // help recognize paste/cut edits in input.poll
            selectingText: false,
            draggingText: false,
            highlight: new Delayed(), // stores highlight worker timeout
            keySeq: null,  // Unfinished key sequence
            specialChars: null
        };

        if (options.autofocus && !mobile) { display.input.focus(); }

        // Override magic textarea content restore that IE sometimes does
        // on our hidden textarea on reload
        if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }

        registerEventHandlers(this);
        ensureGlobalHandlers();

        startOperation(this);
        this.curOp.forceUpdate = true;
        attachDoc(this, doc);

        if ((options.autofocus && !mobile) || this.hasFocus()) {
            setTimeout(function () {
                if (this$1.hasFocus() && !this$1.state.focused) { onFocus(this$1); }
            }, 20);
        }
        else { onBlur(this); }

        for (var opt in optionHandlers) {
            if (optionHandlers.hasOwnProperty(opt)) { optionHandlers[opt](this, options[opt], Init); }
        }
        maybeUpdateLineNumberWidth(this);
        if (options.finishInit) { options.finishInit(this); }
        for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this); }
        endOperation(this);
        // Suppress optimizelegibility in Webkit, since it breaks text
        // measuring on line wrapping boundaries.
        if (webkit && options.lineWrapping &&
            getComputedStyle(display.lineDiv).textRendering == "optimizelegibility") { display.lineDiv.style.textRendering = "auto"; }
    }

    // The default configuration options.
    CodeMirror.defaults = defaults;
    // Functions to run when options are changed.
    CodeMirror.optionHandlers = optionHandlers;

    // Attach the necessary event handlers when initializing the editor
    function registerEventHandlers(cm) {
        var d = cm.display;
        on(d.scroller, "mousedown", operation(cm, onMouseDown));
        // Older IE's will not fire a second mousedown for a double click
        if (ie && ie_version < 11) {
            on(d.scroller, "dblclick", operation(cm, function (e) {
                if (signalDOMEvent(cm, e)) { return }
                var pos = posFromMouse(cm, e);
                if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
                e_preventDefault(e);
                var word = cm.findWordAt(pos);
                extendSelection(cm.doc, word.anchor, word.head);
            }));
        }
        else { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }
        // Some browsers fire contextmenu *after* opening the menu, at
        // which point we can't mess with it anymore. Context menu is
        // handled in onMouseDown for these browsers.
        on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); });
        on(d.input.getField(), "contextmenu", function (e) {
            if (!d.scroller.contains(e.target)) { onContextMenu(cm, e); }
        });

        // Used to suppress mouse event handling when a touch happens
        var touchFinished, prevTouch = { end: 0 };
        function finishTouch() {
            if (d.activeTouch) {
                touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);
                prevTouch = d.activeTouch;
                prevTouch.end = +new Date;
            }
        }
        function isMouseLikeTouchEvent(e) {
            if (e.touches.length != 1) { return false }
            var touch = e.touches[0];
            return touch.radiusX <= 1 && touch.radiusY <= 1
        }
        function farAway(touch, other) {
            if (other.left == null) { return true }
            var dx = other.left - touch.left, dy = other.top - touch.top;
            return dx * dx + dy * dy > 20 * 20
        }
        on(d.scroller, "touchstart", function (e) {
            if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
                d.input.ensurePolled();
                clearTimeout(touchFinished);
                var now = +new Date;
                d.activeTouch = {
                    start: now, moved: false,
                    prev: now - prevTouch.end <= 300 ? prevTouch : null
                };
                if (e.touches.length == 1) {
                    d.activeTouch.left = e.touches[0].pageX;
                    d.activeTouch.top = e.touches[0].pageY;
                }
            }
        });
        on(d.scroller, "touchmove", function () {
            if (d.activeTouch) { d.activeTouch.moved = true; }
        });
        on(d.scroller, "touchend", function (e) {
            var touch = d.activeTouch;
            if (touch && !eventInWidget(d, e) && touch.left != null &&
                !touch.moved && new Date - touch.start < 300) {
                var pos = cm.coordsChar(d.activeTouch, "page"), range;
                if (!touch.prev || farAway(touch, touch.prev)) // Single tap
                { range = new Range(pos, pos); }
                else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
                { range = cm.findWordAt(pos); }
                else // Triple tap
                { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }
                cm.setSelection(range.anchor, range.head);
                cm.focus();
                e_preventDefault(e);
            }
            finishTouch();
        });
        on(d.scroller, "touchcancel", finishTouch);

        // Sync scrolling between fake scrollbars and real scrollable
        // area, ensure viewport is updated when scrolling.
        on(d.scroller, "scroll", function () {
            if (d.scroller.clientHeight) {
                updateScrollTop(cm, d.scroller.scrollTop);
                setScrollLeft(cm, d.scroller.scrollLeft, true);
                signal(cm, "scroll", cm);
            }
        });

        // Listen to wheel events in order to try and update the viewport on time.
        on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); });
        on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); });

        // Prevent wrapper from ever scrolling
        on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });

        d.dragFunctions = {
            enter: function (e) { if (!signalDOMEvent(cm, e)) { e_stop(e); } },
            over: function (e) { if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); } },
            start: function (e) { return onDragStart(cm, e); },
            drop: operation(cm, onDrop),
            leave: function (e) { if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); } }
        };

        var inp = d.input.getField();
        on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); });
        on(inp, "keydown", operation(cm, onKeyDown));
        on(inp, "keypress", operation(cm, onKeyPress));
        on(inp, "focus", function (e) { return onFocus(cm, e); });
        on(inp, "blur", function (e) { return onBlur(cm, e); });
    }

    var initHooks = [];
    CodeMirror.defineInitHook = function (f) { return initHooks.push(f); };

    // Indent the given line. The how parameter can be "smart",
    // "add"/null, "subtract", or "prev". When aggressive is false
    // (typically set to true for forced single-line indents), empty
    // lines are not indented, and places where the mode returns Pass
    // are left alone.
    function indentLine(cm, n, how, aggressive) {
        var doc = cm.doc, state;
        if (how == null) { how = "add"; }
        if (how == "smart") {
            // Fall back to "prev" when the mode doesn't have an indentation
            // method.
            if (!doc.mode.indent) { how = "prev"; }
            else { state = getContextBefore(cm, n).state; }
        }

        var tabSize = cm.options.tabSize;
        var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
        if (line.stateAfter) { line.stateAfter = null; }
        var curSpaceString = line.text.match(/^\s*/)[0], indentation;
        if (!aggressive && !/\S/.test(line.text)) {
            indentation = 0;
            how = "not";
        } else if (how == "smart") {
            indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
            if (indentation == Pass || indentation > 150) {
                if (!aggressive) { return }
                how = "prev";
            }
        }
        if (how == "prev") {
            if (n > doc.first) { indentation = countColumn(getLine(doc, n - 1).text, null, tabSize); }
            else { indentation = 0; }
        } else if (how == "add") {
            indentation = curSpace + cm.options.indentUnit;
        } else if (how == "subtract") {
            indentation = curSpace - cm.options.indentUnit;
        } else if (typeof how == "number") {
            indentation = curSpace + how;
        }
        indentation = Math.max(0, indentation);

        var indentString = "", pos = 0;
        if (cm.options.indentWithTabs) { for (var i = Math.floor(indentation / tabSize); i; --i) { pos += tabSize; indentString += "\t"; } }
        if (pos < indentation) { indentString += spaceStr(indentation - pos); }

        if (indentString != curSpaceString) {
            replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
            line.stateAfter = null;
            return true
        } else {
            // Ensure that, if the cursor was in the whitespace at the start
            // of the line, it is moved to the end of that space.
            for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
                var range = doc.sel.ranges[i$1];
                if (range.head.line == n && range.head.ch < curSpaceString.length) {
                    var pos$1 = Pos(n, curSpaceString.length);
                    replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
                    break
                }
            }
        }
    }

    // This will be set to a {lineWise: bool, text: [string]} object, so
    // that, when pasting, we know what kind of selections the copied
    // text was made out of.
    var lastCopied = null;

    function setLastCopied(newLastCopied) {
        lastCopied = newLastCopied;
    }

    function applyTextInput(cm, inserted, deleted, sel, origin) {
        var doc = cm.doc;
        cm.display.shift = false;
        if (!sel) { sel = doc.sel; }

        var recent = +new Date - 200;
        var paste = origin == "paste" || cm.state.pasteIncoming > recent;
        var textLines = splitLinesAuto(inserted), multiPaste = null;
        // When pasting N lines into N selections, insert one line per selection
        if (paste && sel.ranges.length > 1) {
            if (lastCopied && lastCopied.text.join("\n") == inserted) {
                if (sel.ranges.length % lastCopied.text.length == 0) {
                    multiPaste = [];
                    for (var i = 0; i < lastCopied.text.length; i++) { multiPaste.push(doc.splitLines(lastCopied.text[i])); }
                }
            } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
                multiPaste = map(textLines, function (l) { return [l]; });
            }
        }

        var updateInput = cm.curOp.updateInput;
        // Normal behavior is to insert the new text into every selection
        for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
            var range = sel.ranges[i$1];
            var from = range.from(), to = range.to();
            if (range.empty()) {
                if (deleted && deleted > 0) // Handle deletion
                { from = Pos(from.line, from.ch - deleted); }
                else if (cm.state.overwrite && !paste) // Handle overwrite
                { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }
                else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == textLines.join("\n")) { from = to = Pos(from.line, 0); }
            }
            var changeEvent = {
                from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
                origin: origin || (paste ? "paste" : cm.state.cutIncoming > recent ? "cut" : "+input")
            };
            makeChange(cm.doc, changeEvent);
            signalLater(cm, "inputRead", cm, changeEvent);
        }
        if (inserted && !paste) { triggerElectric(cm, inserted); }

        ensureCursorVisible(cm);
        if (cm.curOp.updateInput < 2) { cm.curOp.updateInput = updateInput; }
        cm.curOp.typing = true;
        cm.state.pasteIncoming = cm.state.cutIncoming = -1;
    }

    function handlePaste(e, cm) {
        var pasted = e.clipboardData && e.clipboardData.getData("Text");
        if (pasted) {
            e.preventDefault();
            if (!cm.isReadOnly() && !cm.options.disableInput && cm.hasFocus()) { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }); }
            return true
        }
    }

    function triggerElectric(cm, inserted) {
        // When an 'electric' character is inserted, immediately trigger a reindent
        if (!cm.options.electricChars || !cm.options.smartIndent) { return }
        var sel = cm.doc.sel;

        for (var i = sel.ranges.length - 1; i >= 0; i--) {
            var range = sel.ranges[i];
            if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }
            var mode = cm.getModeAt(range.head);
            var indented = false;
            if (mode.electricChars) {
                for (var j = 0; j < mode.electricChars.length; j++) {
                    if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
                        indented = indentLine(cm, range.head.line, "smart");
                        break
                    }
                }
            } else if (mode.electricInput) {
                if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch))) { indented = indentLine(cm, range.head.line, "smart"); }
            }
            if (indented) { signalLater(cm, "electricInput", cm, range.head.line); }
        }
    }

    function copyableRanges(cm) {
        var text = [], ranges = [];
        for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
            var line = cm.doc.sel.ranges[i].head.line;
            var lineRange = { anchor: Pos(line, 0), head: Pos(line + 1, 0) };
            ranges.push(lineRange);
            text.push(cm.getRange(lineRange.anchor, lineRange.head));
        }
        return { text: text, ranges: ranges }
    }

    function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {
        field.setAttribute("autocorrect", autocorrect ? "" : "off");
        field.setAttribute("autocapitalize", autocapitalize ? "" : "off");
        field.setAttribute("spellcheck", !!spellcheck);
    }

    function hiddenTextarea() {
        var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; min-height: 1em; outline: none");
        var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
        // The textarea is kept positioned near the cursor to prevent the
        // fact that it'll be scrolled into view on input from scrolling
        // our fake cursor out of view. On webkit, when wrap=off, paste is
        // very slow. So make the area wide instead.
        if (webkit) { te.style.width = "1000px"; }
        else { te.setAttribute("wrap", "off"); }
        // If border: 0; -- iOS fails to open keyboard (issue #1287)
        if (ios) { te.style.border = "1px solid black"; }
        disableBrowserMagic(te);
        return div
    }

    // The publicly visible API. Note that methodOp(f) means
    // 'wrap f in an operation, performed on its `this` parameter'.

    // This is not the complete set of editor methods. Most of the
    // methods defined on the Doc type are also injected into
    // CodeMirror.prototype, for backwards compatibility and
    // convenience.

    function addEditorMethods(CodeMirror) {
        var optionHandlers = CodeMirror.optionHandlers;

        var helpers = CodeMirror.helpers = {};

        CodeMirror.prototype = {
            constructor: CodeMirror,
            focus: function () { win(this).focus(); this.display.input.focus(); },

            setOption: function (option, value) {
                var options = this.options, old = options[option];
                if (options[option] == value && option != "mode") { return }
                options[option] = value;
                if (optionHandlers.hasOwnProperty(option)) { operation(this, optionHandlers[option])(this, value, old); }
                signal(this, "optionChange", this, option);
            },

            getOption: function (option) { return this.options[option] },
            getDoc: function () { return this.doc },

            addKeyMap: function (map, bottom) {
                this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
            },
            removeKeyMap: function (map) {
                var maps = this.state.keyMaps;
                for (var i = 0; i < maps.length; ++i) {
                    if (maps[i] == map || maps[i].name == map) {
                        maps.splice(i, 1);
                        return true
                    }
                }
            },

            addOverlay: methodOp(function (spec, options) {
                var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
                if (mode.startState) { throw new Error("Overlays may not be stateful.") }
                insertSorted(this.state.overlays,
                    {
                        mode: mode, modeSpec: spec, opaque: options && options.opaque,
                        priority: (options && options.priority) || 0
                    },
                    function (overlay) { return overlay.priority; });
                this.state.modeGen++;
                regChange(this);
            }),
            removeOverlay: methodOp(function (spec) {
                var overlays = this.state.overlays;
                for (var i = 0; i < overlays.length; ++i) {
                    var cur = overlays[i].modeSpec;
                    if (cur == spec || typeof spec == "string" && cur.name == spec) {
                        overlays.splice(i, 1);
                        this.state.modeGen++;
                        regChange(this);
                        return
                    }
                }
            }),

            indentLine: methodOp(function (n, dir, aggressive) {
                if (typeof dir != "string" && typeof dir != "number") {
                    if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev"; }
                    else { dir = dir ? "add" : "subtract"; }
                }
                if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }
            }),
            indentSelection: methodOp(function (how) {
                var ranges = this.doc.sel.ranges, end = -1;
                for (var i = 0; i < ranges.length; i++) {
                    var range = ranges[i];
                    if (!range.empty()) {
                        var from = range.from(), to = range.to();
                        var start = Math.max(end, from.line);
                        end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
                        for (var j = start; j < end; ++j) { indentLine(this, j, how); }
                        var newRanges = this.doc.sel.ranges;
                        if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0) { replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }
                    } else if (range.head.line > end) {
                        indentLine(this, range.head.line, how, true);
                        end = range.head.line;
                        if (i == this.doc.sel.primIndex) { ensureCursorVisible(this); }
                    }
                }
            }),

            // Fetch the parser token for a given character. Useful for hacks
            // that want to inspect the mode state (say, for completion).
            getTokenAt: function (pos, precise) {
                return takeToken(this, pos, precise)
            },

            getLineTokens: function (line, precise) {
                return takeToken(this, Pos(line), precise, true)
            },

            getTokenTypeAt: function (pos) {
                pos = clipPos(this.doc, pos);
                var styles = getLineStyles(this, getLine(this.doc, pos.line));
                var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
                var type;
                if (ch == 0) { type = styles[2]; }
                else {
                    for (; ;) {
                        var mid = (before + after) >> 1;
                        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }
                        else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }
                        else { type = styles[mid * 2 + 2]; break }
                    }
                }
                var cut = type ? type.indexOf("overlay ") : -1;
                return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
            },

            getModeAt: function (pos) {
                var mode = this.doc.mode;
                if (!mode.innerMode) { return mode }
                return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
            },

            getHelper: function (pos, type) {
                return this.getHelpers(pos, type)[0]
            },

            getHelpers: function (pos, type) {
                var found = [];
                if (!helpers.hasOwnProperty(type)) { return found }
                var help = helpers[type], mode = this.getModeAt(pos);
                if (typeof mode[type] == "string") {
                    if (help[mode[type]]) { found.push(help[mode[type]]); }
                } else if (mode[type]) {
                    for (var i = 0; i < mode[type].length; i++) {
                        var val = help[mode[type][i]];
                        if (val) { found.push(val); }
                    }
                } else if (mode.helperType && help[mode.helperType]) {
                    found.push(help[mode.helperType]);
                } else if (help[mode.name]) {
                    found.push(help[mode.name]);
                }
                for (var i$1 = 0; i$1 < help._global.length; i$1++) {
                    var cur = help._global[i$1];
                    if (cur.pred(mode, this) && indexOf(found, cur.val) == -1) { found.push(cur.val); }
                }
                return found
            },

            getStateAfter: function (line, precise) {
                var doc = this.doc;
                line = clipLine(doc, line == null ? doc.first + doc.size - 1 : line);
                return getContextBefore(this, line + 1, precise).state
            },

            cursorCoords: function (start, mode) {
                var pos, range = this.doc.sel.primary();
                if (start == null) { pos = range.head; }
                else if (typeof start == "object") { pos = clipPos(this.doc, start); }
                else { pos = start ? range.from() : range.to(); }
                return cursorCoords(this, pos, mode || "page")
            },

            charCoords: function (pos, mode) {
                return charCoords(this, clipPos(this.doc, pos), mode || "page")
            },

            coordsChar: function (coords, mode) {
                coords = fromCoordSystem(this, coords, mode || "page");
                return coordsChar(this, coords.left, coords.top)
            },

            lineAtHeight: function (height, mode) {
                height = fromCoordSystem(this, { top: height, left: 0 }, mode || "page").top;
                return lineAtHeight(this.doc, height + this.display.viewOffset)
            },
            heightAtLine: function (line, mode, includeWidgets) {
                var end = false, lineObj;
                if (typeof line == "number") {
                    var last = this.doc.first + this.doc.size - 1;
                    if (line < this.doc.first) { line = this.doc.first; }
                    else if (line > last) { line = last; end = true; }
                    lineObj = getLine(this.doc, line);
                } else {
                    lineObj = line;
                }
                return intoCoordSystem(this, lineObj, { top: 0, left: 0 }, mode || "page", includeWidgets || end).top +
                    (end ? this.doc.height - heightAtLine(lineObj) : 0)
            },

            defaultTextHeight: function () { return textHeight(this.display) },
            defaultCharWidth: function () { return charWidth(this.display) },

            getViewport: function () { return { from: this.display.viewFrom, to: this.display.viewTo } },

            addWidget: function (pos, node, scroll, vert, horiz) {
                var display = this.display;
                pos = cursorCoords(this, clipPos(this.doc, pos));
                var top = pos.bottom, left = pos.left;
                node.style.position = "absolute";
                node.setAttribute("cm-ignore-events", "true");
                this.display.input.setUneditable(node);
                display.sizer.appendChild(node);
                if (vert == "over") {
                    top = pos.top;
                } else if (vert == "above" || vert == "near") {
                    var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
                        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
                    // Default to positioning above (if specified and possible); otherwise default to positioning below
                    if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight) { top = pos.top - node.offsetHeight; }
                    else if (pos.bottom + node.offsetHeight <= vspace) { top = pos.bottom; }
                    if (left + node.offsetWidth > hspace) { left = hspace - node.offsetWidth; }
                }
                node.style.top = top + "px";
                node.style.left = node.style.right = "";
                if (horiz == "right") {
                    left = display.sizer.clientWidth - node.offsetWidth;
                    node.style.right = "0px";
                } else {
                    if (horiz == "left") { left = 0; }
                    else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }
                    node.style.left = left + "px";
                }
                if (scroll) { scrollIntoView(this, { left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight }); }
            },

            triggerOnKeyDown: methodOp(onKeyDown),
            triggerOnKeyPress: methodOp(onKeyPress),
            triggerOnKeyUp: onKeyUp,
            triggerOnMouseDown: methodOp(onMouseDown),

            execCommand: function (cmd) {
                if (commands.hasOwnProperty(cmd)) { return commands[cmd].call(null, this) }
            },

            triggerElectric: methodOp(function (text) { triggerElectric(this, text); }),

            findPosH: function (from, amount, unit, visually) {
                var dir = 1;
                if (amount < 0) { dir = -1; amount = -amount; }
                var cur = clipPos(this.doc, from);
                for (var i = 0; i < amount; ++i) {
                    cur = findPosH(this.doc, cur, dir, unit, visually);
                    if (cur.hitSide) { break }
                }
                return cur
            },

            moveH: methodOp(function (dir, unit) {
                var this$1 = this;

                this.extendSelectionsBy(function (range) {
                    if (this$1.display.shift || this$1.doc.extend || range.empty()) { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }
                    else { return dir < 0 ? range.from() : range.to() }
                }, sel_move);
            }),

            deleteH: methodOp(function (dir, unit) {
                var sel = this.doc.sel, doc = this.doc;
                if (sel.somethingSelected()) { doc.replaceSelection("", null, "+delete"); }
                else {
                    deleteNearSelection(this, function (range) {
                        var other = findPosH(doc, range.head, dir, unit, false);
                        return dir < 0 ? { from: other, to: range.head } : { from: range.head, to: other }
                    });
                }
            }),

            findPosV: function (from, amount, unit, goalColumn) {
                var dir = 1, x = goalColumn;
                if (amount < 0) { dir = -1; amount = -amount; }
                var cur = clipPos(this.doc, from);
                for (var i = 0; i < amount; ++i) {
                    var coords = cursorCoords(this, cur, "div");
                    if (x == null) { x = coords.left; }
                    else { coords.left = x; }
                    cur = findPosV(this, coords, dir, unit);
                    if (cur.hitSide) { break }
                }
                return cur
            },

            moveV: methodOp(function (dir, unit) {
                var this$1 = this;

                var doc = this.doc, goals = [];
                var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
                doc.extendSelectionsBy(function (range) {
                    if (collapse) { return dir < 0 ? range.from() : range.to() }
                    var headPos = cursorCoords(this$1, range.head, "div");
                    if (range.goalColumn != null) { headPos.left = range.goalColumn; }
                    goals.push(headPos.left);
                    var pos = findPosV(this$1, headPos, dir, unit);
                    if (unit == "page" && range == doc.sel.primary()) { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top); }
                    return pos
                }, sel_move);
                if (goals.length) {
                    for (var i = 0; i < doc.sel.ranges.length; i++) { doc.sel.ranges[i].goalColumn = goals[i]; }
                }
            }),

            // Find the word at the given position (as returned by coordsChar).
            findWordAt: function (pos) {
                var doc = this.doc, line = getLine(doc, pos.line).text;
                var start = pos.ch, end = pos.ch;
                if (line) {
                    var helper = this.getHelper(pos, "wordChars");
                    if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end; }
                    var startChar = line.charAt(start);
                    var check = isWordChar(startChar, helper)
                        ? function (ch) { return isWordChar(ch, helper); }
                        : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
                            : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); };
                    while (start > 0 && check(line.charAt(start - 1))) { --start; }
                    while (end < line.length && check(line.charAt(end))) { ++end; }
                }
                return new Range(Pos(pos.line, start), Pos(pos.line, end))
            },

            toggleOverwrite: function (value) {
                if (value != null && value == this.state.overwrite) { return }
                if (this.state.overwrite = !this.state.overwrite) { addClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
                else { rmClass(this.display.cursorDiv, "CodeMirror-overwrite"); }

                signal(this, "overwriteToggle", this, this.state.overwrite);
            },
            hasFocus: function () { return this.display.input.getField() == activeElt(doc(this)) },
            isReadOnly: function () { return !!(this.options.readOnly || this.doc.cantEdit) },

            scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),
            getScrollInfo: function () {
                var scroller = this.display.scroller;
                return {
                    left: scroller.scrollLeft, top: scroller.scrollTop,
                    height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
                    width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
                    clientHeight: displayHeight(this), clientWidth: displayWidth(this)
                }
            },

            scrollIntoView: methodOp(function (range, margin) {
                if (range == null) {
                    range = { from: this.doc.sel.primary().head, to: null };
                    if (margin == null) { margin = this.options.cursorScrollMargin; }
                } else if (typeof range == "number") {
                    range = { from: Pos(range, 0), to: null };
                } else if (range.from == null) {
                    range = { from: range, to: null };
                }
                if (!range.to) { range.to = range.from; }
                range.margin = margin || 0;

                if (range.from.line != null) {
                    scrollToRange(this, range);
                } else {
                    scrollToCoordsRange(this, range.from, range.to, range.margin);
                }
            }),

            setSize: methodOp(function (width, height) {
                var this$1 = this;

                var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; };
                if (width != null) { this.display.wrapper.style.width = interpret(width); }
                if (height != null) { this.display.wrapper.style.height = interpret(height); }
                if (this.options.lineWrapping) { clearLineMeasurementCache(this); }
                var lineNo = this.display.viewFrom;
                this.doc.iter(lineNo, this.display.viewTo, function (line) {
                    if (line.widgets) {
                        for (var i = 0; i < line.widgets.length; i++) { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } }
                    }
                    ++lineNo;
                });
                this.curOp.forceUpdate = true;
                signal(this, "refresh", this);
            }),

            operation: function (f) { return runInOp(this, f) },
            startOperation: function () { return startOperation(this) },
            endOperation: function () { return endOperation(this) },

            refresh: methodOp(function () {
                var oldHeight = this.display.cachedTextHeight;
                regChange(this);
                this.curOp.forceUpdate = true;
                clearCaches(this);
                scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
                updateGutterSpace(this.display);
                if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5 || this.options.lineWrapping) { estimateLineHeights(this); }
                signal(this, "refresh", this);
            }),

            swapDoc: methodOp(function (doc) {
                var old = this.doc;
                old.cm = null;
                // Cancel the current text selection if any (#5821)
                if (this.state.selectingText) { this.state.selectingText(); }
                attachDoc(this, doc);
                clearCaches(this);
                this.display.input.reset();
                scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
                this.curOp.forceScroll = true;
                signalLater(this, "swapDoc", this, old);
                return old
            }),

            phrase: function (phraseText) {
                var phrases = this.options.phrases;
                return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText
            },

            getInputField: function () { return this.display.input.getField() },
            getWrapperElement: function () { return this.display.wrapper },
            getScrollerElement: function () { return this.display.scroller },
            getGutterElement: function () { return this.display.gutters }
        };
        eventMixin(CodeMirror);

        CodeMirror.registerHelper = function (type, name, value) {
            if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = { _global: [] }; }
            helpers[type][name] = value;
        };
        CodeMirror.registerGlobalHelper = function (type, name, predicate, value) {
            CodeMirror.registerHelper(type, name, value);
            helpers[type]._global.push({ pred: predicate, val: value });
        };
    }

    // Used for horizontal relative motion. Dir is -1 or 1 (left or
    // right), unit can be "codepoint", "char", "column" (like char, but
    // doesn't cross line boundaries), "word" (across next word), or
    // "group" (to the start of next group of word or
    // non-word-non-whitespace chars). The visually param controls
    // whether, in right-to-left text, direction 1 means to move towards
    // the next index in the string, or towards the character to the right
    // of the current position. The resulting position will have a
    // hitSide=true property if it reached the end of the document.
    function findPosH(doc, pos, dir, unit, visually) {
        var oldPos = pos;
        var origDir = dir;
        var lineObj = getLine(doc, pos.line);
        var lineDir = visually && doc.direction == "rtl" ? -dir : dir;
        function findNextLine() {
            var l = pos.line + lineDir;
            if (l < doc.first || l >= doc.first + doc.size) { return false }
            pos = new Pos(l, pos.ch, pos.sticky);
            return lineObj = getLine(doc, l)
        }
        function moveOnce(boundToLine) {
            var next;
            if (unit == "codepoint") {
                var ch = lineObj.text.charCodeAt(pos.ch + (dir > 0 ? 0 : -1));
                if (isNaN(ch)) {
                    next = null;
                } else {
                    var astral = dir > 0 ? ch >= 0xD800 && ch < 0xDC00 : ch >= 0xDC00 && ch < 0xDFFF;
                    next = new Pos(pos.line, Math.max(0, Math.min(lineObj.text.length, pos.ch + dir * (astral ? 2 : 1))), -dir);
                }
            } else if (visually) {
                next = moveVisually(doc.cm, lineObj, pos, dir);
            } else {
                next = moveLogically(lineObj, pos, dir);
            }
            if (next == null) {
                if (!boundToLine && findNextLine()) { pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir); }
                else { return false }
            } else {
                pos = next;
            }
            return true
        }

        if (unit == "char" || unit == "codepoint") {
            moveOnce();
        } else if (unit == "column") {
            moveOnce(true);
        } else if (unit == "word" || unit == "group") {
            var sawType = null, group = unit == "group";
            var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
            for (var first = true; ; first = false) {
                if (dir < 0 && !moveOnce(!first)) { break }
                var cur = lineObj.text.charAt(pos.ch) || "\n";
                var type = isWordChar(cur, helper) ? "w"
                    : group && cur == "\n" ? "n"
                        : !group || /\s/.test(cur) ? null
                            : "p";
                if (group && !first && !type) { type = "s"; }
                if (sawType && sawType != type) {
                    if (dir < 0) { dir = 1; moveOnce(); pos.sticky = "after"; }
                    break
                }

                if (type) { sawType = type; }
                if (dir > 0 && !moveOnce(!first)) { break }
            }
        }
        var result = skipAtomic(doc, pos, oldPos, origDir, true);
        if (equalCursorPos(oldPos, result)) { result.hitSide = true; }
        return result
    }

    // For relative vertical movement. Dir may be -1 or 1. Unit can be
    // "page" or "line". The resulting position will have a hitSide=true
    // property if it reached the end of the document.
    function findPosV(cm, pos, dir, unit) {
        var doc = cm.doc, x = pos.left, y;
        if (unit == "page") {
            var pageSize = Math.min(cm.display.wrapper.clientHeight, win(cm).innerHeight || doc(cm).documentElement.clientHeight);
            var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
            y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;

        } else if (unit == "line") {
            y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
        }
        var target;
        for (; ;) {
            target = coordsChar(cm, x, y);
            if (!target.outside) { break }
            if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
            y += dir * 5;
        }
        return target
    }

    // CONTENTEDITABLE INPUT STYLE

    var ContentEditableInput = function (cm) {
        this.cm = cm;
        this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
        this.polling = new Delayed();
        this.composing = null;
        this.gracePeriod = false;
        this.readDOMTimeout = null;
    };

    ContentEditableInput.prototype.init = function (display) {
        var this$1 = this;

        var input = this, cm = input.cm;
        var div = input.div = display.lineDiv;
        div.contentEditable = true;
        disableBrowserMagic(div, cm.options.spellcheck, cm.options.autocorrect, cm.options.autocapitalize);

        function belongsToInput(e) {
            for (var t = e.target; t; t = t.parentNode) {
                if (t == div) { return true }
                if (/\bCodeMirror-(?:line)?widget\b/.test(t.className)) { break }
            }
            return false
        }

        on(div, "paste", function (e) {
            if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
            // IE doesn't fire input events, so we schedule a read for the pasted content in this way
            if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }
        });

        on(div, "compositionstart", function (e) {
            this$1.composing = { data: e.data, done: false };
        });
        on(div, "compositionupdate", function (e) {
            if (!this$1.composing) { this$1.composing = { data: e.data, done: false }; }
        });
        on(div, "compositionend", function (e) {
            if (this$1.composing) {
                if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }
                this$1.composing.done = true;
            }
        });

        on(div, "touchstart", function () { return input.forceCompositionEnd(); });

        on(div, "input", function () {
            if (!this$1.composing) { this$1.readFromDOMSoon(); }
        });

        function onCopyCut(e) {
            if (!belongsToInput(e) || signalDOMEvent(cm, e)) { return }
            if (cm.somethingSelected()) {
                setLastCopied({ lineWise: false, text: cm.getSelections() });
                if (e.type == "cut") { cm.replaceSelection("", null, "cut"); }
            } else if (!cm.options.lineWiseCopyCut) {
                return
            } else {
                var ranges = copyableRanges(cm);
                setLastCopied({ lineWise: true, text: ranges.text });
                if (e.type == "cut") {
                    cm.operation(function () {
                        cm.setSelections(ranges.ranges, 0, sel_dontScroll);
                        cm.replaceSelection("", null, "cut");
                    });
                }
            }
            if (e.clipboardData) {
                e.clipboardData.clearData();
                var content = lastCopied.text.join("\n");
                // iOS exposes the clipboard API, but seems to discard content inserted into it
                e.clipboardData.setData("Text", content);
                if (e.clipboardData.getData("Text") == content) {
                    e.preventDefault();
                    return
                }
            }
            // Old-fashioned briefly-focus-a-textarea hack
            var kludge = hiddenTextarea(), te = kludge.firstChild;
            cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
            te.value = lastCopied.text.join("\n");
            var hadFocus = activeElt(div.ownerDocument);
            selectInput(te);
            setTimeout(function () {
                cm.display.lineSpace.removeChild(kludge);
                hadFocus.focus();
                if (hadFocus == div) { input.showPrimarySelection(); }
            }, 50);
        }
        on(div, "copy", onCopyCut);
        on(div, "cut", onCopyCut);
    };

    ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {
        // Label for screenreaders, accessibility
        if (label) {
            this.div.setAttribute('aria-label', label);
        } else {
            this.div.removeAttribute('aria-label');
        }
    };

    ContentEditableInput.prototype.prepareSelection = function () {
        var result = prepareSelection(this.cm, false);
        result.focus = activeElt(this.div.ownerDocument) == this.div;
        return result
    };

    ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
        if (!info || !this.cm.display.view.length) { return }
        if (info.focus || takeFocus) { this.showPrimarySelection(); }
        this.showMultipleSelections(info);
    };

    ContentEditableInput.prototype.getSelection = function () {
        return this.cm.display.wrapper.ownerDocument.getSelection()
    };

    ContentEditableInput.prototype.showPrimarySelection = function () {
        var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();
        var from = prim.from(), to = prim.to();

        if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
            sel.removeAllRanges();
            return
        }

        var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
        var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
        if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
            cmp(minPos(curAnchor, curFocus), from) == 0 &&
            cmp(maxPos(curAnchor, curFocus), to) == 0) { return }

        var view = cm.display.view;
        var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
            { node: view[0].measure.map[2], offset: 0 };
        var end = to.line < cm.display.viewTo && posToDOM(cm, to);
        if (!end) {
            var measure = view[view.length - 1].measure;
            var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
            end = { node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3] };
        }

        if (!start || !end) {
            sel.removeAllRanges();
            return
        }

        var old = sel.rangeCount && sel.getRangeAt(0), rng;
        try { rng = range(start.node, start.offset, end.offset, end.node); }
        catch (e) { } // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
        if (rng) {
            if (!gecko && cm.state.focused) {
                sel.collapse(start.node, start.offset);
                if (!rng.collapsed) {
                    sel.removeAllRanges();
                    sel.addRange(rng);
                }
            } else {
                sel.removeAllRanges();
                sel.addRange(rng);
            }
            if (old && sel.anchorNode == null) { sel.addRange(old); }
            else if (gecko) { this.startGracePeriod(); }
        }
        this.rememberSelection();
    };

    ContentEditableInput.prototype.startGracePeriod = function () {
        var this$1 = this;

        clearTimeout(this.gracePeriod);
        this.gracePeriod = setTimeout(function () {
            this$1.gracePeriod = false;
            if (this$1.selectionChanged()) { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }
        }, 20);
    };

    ContentEditableInput.prototype.showMultipleSelections = function (info) {
        removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
        removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
    };

    ContentEditableInput.prototype.rememberSelection = function () {
        var sel = this.getSelection();
        this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
        this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
    };

    ContentEditableInput.prototype.selectionInEditor = function () {
        var sel = this.getSelection();
        if (!sel.rangeCount) { return false }
        var node = sel.getRangeAt(0).commonAncestorContainer;
        return contains(this.div, node)
    };

    ContentEditableInput.prototype.focus = function () {
        if (this.cm.options.readOnly != "nocursor") {
            if (!this.selectionInEditor() || activeElt(this.div.ownerDocument) != this.div) { this.showSelection(this.prepareSelection(), true); }
            this.div.focus();
        }
    };
    ContentEditableInput.prototype.blur = function () { this.div.blur(); };
    ContentEditableInput.prototype.getField = function () { return this.div };

    ContentEditableInput.prototype.supportsTouch = function () { return true };

    ContentEditableInput.prototype.receivedFocus = function () {
        var this$1 = this;

        var input = this;
        if (this.selectionInEditor()) { setTimeout(function () { return this$1.pollSelection(); }, 20); }
        else { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }

        function poll() {
            if (input.cm.state.focused) {
                input.pollSelection();
                input.polling.set(input.cm.options.pollInterval, poll);
            }
        }
        this.polling.set(this.cm.options.pollInterval, poll);
    };

    ContentEditableInput.prototype.selectionChanged = function () {
        var sel = this.getSelection();
        return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
            sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
    };

    ContentEditableInput.prototype.pollSelection = function () {
        if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
        var sel = this.getSelection(), cm = this.cm;
        // On Android Chrome (version 56, at least), backspacing into an
        // uneditable block element will put the cursor in that element,
        // and then, because it's not editable, hide the virtual keyboard.
        // Because Android doesn't allow us to actually detect backspace
        // presses in a sane way, this code checks for when that happens
        // and simulates a backspace press in this case.
        if (android && chrome && this.cm.display.gutterSpecs.length && isInGutter(sel.anchorNode)) {
            this.cm.triggerOnKeyDown({ type: "keydown", keyCode: 8, preventDefault: Math.abs });
            this.blur();
            this.focus();
            return
        }
        if (this.composing) { return }
        this.rememberSelection();
        var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
        var head = domToPos(cm, sel.focusNode, sel.focusOffset);
        if (anchor && head) {
            runInOp(cm, function () {
                setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
                if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }
            });
        }
    };

    ContentEditableInput.prototype.pollContent = function () {
        if (this.readDOMTimeout != null) {
            clearTimeout(this.readDOMTimeout);
            this.readDOMTimeout = null;
        }

        var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
        var from = sel.from(), to = sel.to();
        if (from.ch == 0 && from.line > cm.firstLine()) { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }
        if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine()) { to = Pos(to.line + 1, 0); }
        if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }

        var fromIndex, fromLine, fromNode;
        if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
            fromLine = lineNo(display.view[0].line);
            fromNode = display.view[0].node;
        } else {
            fromLine = lineNo(display.view[fromIndex].line);
            fromNode = display.view[fromIndex - 1].node.nextSibling;
        }
        var toIndex = findViewIndex(cm, to.line);
        var toLine, toNode;
        if (toIndex == display.view.length - 1) {
            toLine = display.viewTo - 1;
            toNode = display.lineDiv.lastChild;
        } else {
            toLine = lineNo(display.view[toIndex + 1].line) - 1;
            toNode = display.view[toIndex + 1].node.previousSibling;
        }

        if (!fromNode) { return false }
        var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
        var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
        while (newText.length > 1 && oldText.length > 1) {
            if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
            else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
            else { break }
        }

        var cutFront = 0, cutEnd = 0;
        var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
        while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront)) { ++cutFront; }
        var newBot = lst(newText), oldBot = lst(oldText);
        var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
            oldBot.length - (oldText.length == 1 ? cutFront : 0));
        while (cutEnd < maxCutEnd &&
            newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) { ++cutEnd; }
        // Try to move start of change to start of selection if ambiguous
        if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
            while (cutFront && cutFront > from.ch &&
                newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
                cutFront--;
                cutEnd++;
            }
        }

        newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
        newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

        var chFrom = Pos(fromLine, cutFront);
        var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
        if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
            replaceRange(cm.doc, newText, chFrom, chTo, "+input");
            return true
        }
    };

    ContentEditableInput.prototype.ensurePolled = function () {
        this.forceCompositionEnd();
    };
    ContentEditableInput.prototype.reset = function () {
        this.forceCompositionEnd();
    };
    ContentEditableInput.prototype.forceCompositionEnd = function () {
        if (!this.composing) { return }
        clearTimeout(this.readDOMTimeout);
        this.composing = null;
        this.updateFromDOM();
        this.div.blur();
        this.div.focus();
    };
    ContentEditableInput.prototype.readFromDOMSoon = function () {
        var this$1 = this;

        if (this.readDOMTimeout != null) { return }
        this.readDOMTimeout = setTimeout(function () {
            this$1.readDOMTimeout = null;
            if (this$1.composing) {
                if (this$1.composing.done) { this$1.composing = null; }
                else { return }
            }
            this$1.updateFromDOM();
        }, 80);
    };

    ContentEditableInput.prototype.updateFromDOM = function () {
        var this$1 = this;

        if (this.cm.isReadOnly() || !this.pollContent()) { runInOp(this.cm, function () { return regChange(this$1.cm); }); }
    };

    ContentEditableInput.prototype.setUneditable = function (node) {
        node.contentEditable = "false";
    };

    ContentEditableInput.prototype.onKeyPress = function (e) {
        if (e.charCode == 0 || this.composing) { return }
        e.preventDefault();
        if (!this.cm.isReadOnly()) { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }
    };

    ContentEditableInput.prototype.readOnlyChanged = function (val) {
        this.div.contentEditable = String(val != "nocursor");
    };

    ContentEditableInput.prototype.onContextMenu = function () { };
    ContentEditableInput.prototype.resetPosition = function () { };

    ContentEditableInput.prototype.needsContentAttribute = true;

    function posToDOM(cm, pos) {
        var view = findViewForLine(cm, pos.line);
        if (!view || view.hidden) { return null }
        var line = getLine(cm.doc, pos.line);
        var info = mapFromLineView(view, line, pos.line);

        var order = getOrder(line, cm.doc.direction), side = "left";
        if (order) {
            var partPos = getBidiPartAt(order, pos.ch);
            side = partPos % 2 ? "right" : "left";
        }
        var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
        result.offset = result.collapse == "right" ? result.end : result.start;
        return result
    }

    function isInGutter(node) {
        for (var scan = node; scan; scan = scan.parentNode) { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
        return false
    }

    function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }

    function domTextBetween(cm, from, to, fromLine, toLine) {
        var text = "", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;
        function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
        function close() {
            if (closing) {
                text += lineSep;
                if (extraLinebreak) { text += lineSep; }
                closing = extraLinebreak = false;
            }
        }
        function addText(str) {
            if (str) {
                close();
                text += str;
            }
        }
        function walk(node) {
            if (node.nodeType == 1) {
                var cmText = node.getAttribute("cm-text");
                if (cmText) {
                    addText(cmText);
                    return
                }
                var markerID = node.getAttribute("cm-marker"), range;
                if (markerID) {
                    var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
                    if (found.length && (range = found[0].find(0))) { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)); }
                    return
                }
                if (node.getAttribute("contenteditable") == "false") { return }
                var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);
                if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) { return }

                if (isBlock) { close(); }
                for (var i = 0; i < node.childNodes.length; i++) { walk(node.childNodes[i]); }

                if (/^(pre|p)$/i.test(node.nodeName)) { extraLinebreak = true; }
                if (isBlock) { closing = true; }
            } else if (node.nodeType == 3) {
                addText(node.nodeValue.replace(/\u200b/g, "").replace(/\u00a0/g, " "));
            }
        }
        for (; ;) {
            walk(from);
            if (from == to) { break }
            from = from.nextSibling;
            extraLinebreak = false;
        }
        return text
    }

    function domToPos(cm, node, offset) {
        var lineNode;
        if (node == cm.display.lineDiv) {
            lineNode = cm.display.lineDiv.childNodes[offset];
            if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
            node = null; offset = 0;
        } else {
            for (lineNode = node; ; lineNode = lineNode.parentNode) {
                if (!lineNode || lineNode == cm.display.lineDiv) { return null }
                if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
            }
        }
        for (var i = 0; i < cm.display.view.length; i++) {
            var lineView = cm.display.view[i];
            if (lineView.node == lineNode) { return locateNodeInLineView(lineView, node, offset) }
        }
    }

    function locateNodeInLineView(lineView, node, offset) {
        var wrapper = lineView.text.firstChild, bad = false;
        if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
        if (node == wrapper) {
            bad = true;
            node = wrapper.childNodes[offset];
            offset = 0;
            if (!node) {
                var line = lineView.rest ? lst(lineView.rest) : lineView.line;
                return badPos(Pos(lineNo(line), line.text.length), bad)
            }
        }

        var textNode = node.nodeType == 3 ? node : null, topNode = node;
        if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
            textNode = node.firstChild;
            if (offset) { offset = textNode.nodeValue.length; }
        }
        while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }
        var measure = lineView.measure, maps = measure.maps;

        function find(textNode, topNode, offset) {
            for (var i = -1; i < (maps ? maps.length : 0); i++) {
                var map = i < 0 ? measure.map : maps[i];
                for (var j = 0; j < map.length; j += 3) {
                    var curNode = map[j + 2];
                    if (curNode == textNode || curNode == topNode) {
                        var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
                        var ch = map[j] + offset;
                        if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)]; }
                        return Pos(line, ch)
                    }
                }
            }
        }
        var found = find(textNode, topNode, offset);
        if (found) { return badPos(found, bad) }

        // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
        for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
            found = find(after, after.firstChild, 0);
            if (found) { return badPos(Pos(found.line, found.ch - dist), bad) }
            else { dist += after.textContent.length; }
        }
        for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
            found = find(before, before.firstChild, -1);
            if (found) { return badPos(Pos(found.line, found.ch + dist$1), bad) }
            else { dist$1 += before.textContent.length; }
        }
    }

    // TEXTAREA INPUT STYLE

    var TextareaInput = function (cm) {
        this.cm = cm;
        // See input.poll and input.reset
        this.prevInput = "";

        // Flag that indicates whether we expect input to appear real soon
        // now (after some event like 'keypress' or 'input') and are
        // polling intensively.
        this.pollingFast = false;
        // Self-resetting timeout for the poller
        this.polling = new Delayed();
        // Used to work around IE issue with selection being forgotten when focus moves away from textarea
        this.hasSelection = false;
        this.composing = null;
    };

    TextareaInput.prototype.init = function (display) {
        var this$1 = this;

        var input = this, cm = this.cm;
        this.createField(display);
        var te = this.textarea;

        display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);

        // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
        if (ios) { te.style.width = "0px"; }

        on(te, "input", function () {
            if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }
            input.poll();
        });

        on(te, "paste", function (e) {
            if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }

            cm.state.pasteIncoming = +new Date;
            input.fastPoll();
        });

        function prepareCopyCut(e) {
            if (signalDOMEvent(cm, e)) { return }
            if (cm.somethingSelected()) {
                setLastCopied({ lineWise: false, text: cm.getSelections() });
            } else if (!cm.options.lineWiseCopyCut) {
                return
            } else {
                var ranges = copyableRanges(cm);
                setLastCopied({ lineWise: true, text: ranges.text });
                if (e.type == "cut") {
                    cm.setSelections(ranges.ranges, null, sel_dontScroll);
                } else {
                    input.prevInput = "";
                    te.value = ranges.text.join("\n");
                    selectInput(te);
                }
            }
            if (e.type == "cut") { cm.state.cutIncoming = +new Date; }
        }
        on(te, "cut", prepareCopyCut);
        on(te, "copy", prepareCopyCut);

        on(display.scroller, "paste", function (e) {
            if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
            if (!te.dispatchEvent) {
                cm.state.pasteIncoming = +new Date;
                input.focus();
                return
            }

            // Pass the `paste` event to the textarea so it's handled by its event listener.
            var event = new Event("paste");
            event.clipboardData = e.clipboardData;
            te.dispatchEvent(event);
        });

        // Prevent normal selection in the editor (we handle our own)
        on(display.lineSpace, "selectstart", function (e) {
            if (!eventInWidget(display, e)) { e_preventDefault(e); }
        });

        on(te, "compositionstart", function () {
            var start = cm.getCursor("from");
            if (input.composing) { input.composing.range.clear(); }
            input.composing = {
                start: start,
                range: cm.markText(start, cm.getCursor("to"), { className: "CodeMirror-composing" })
            };
        });
        on(te, "compositionend", function () {
            if (input.composing) {
                input.poll();
                input.composing.range.clear();
                input.composing = null;
            }
        });
    };

    TextareaInput.prototype.createField = function (_display) {
        // Wraps and hides input textarea
        this.wrapper = hiddenTextarea();
        // The semihidden textarea that is focused when the editor is
        // focused, and receives input.
        this.textarea = this.wrapper.firstChild;
    };

    TextareaInput.prototype.screenReaderLabelChanged = function (label) {
        // Label for screenreaders, accessibility
        if (label) {
            this.textarea.setAttribute('aria-label', label);
        } else {
            this.textarea.removeAttribute('aria-label');
        }
    };

    TextareaInput.prototype.prepareSelection = function () {
        // Redraw the selection and/or cursor
        var cm = this.cm, display = cm.display, doc = cm.doc;
        var result = prepareSelection(cm);

        // Move the hidden textarea near the cursor to prevent scrolling artifacts
        if (cm.options.moveInputWithCursor) {
            var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
            var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
            result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
                headPos.top + lineOff.top - wrapOff.top));
            result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
                headPos.left + lineOff.left - wrapOff.left));
        }

        return result
    };

    TextareaInput.prototype.showSelection = function (drawn) {
        var cm = this.cm, display = cm.display;
        removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
        removeChildrenAndAdd(display.selectionDiv, drawn.selection);
        if (drawn.teTop != null) {
            this.wrapper.style.top = drawn.teTop + "px";
            this.wrapper.style.left = drawn.teLeft + "px";
        }
    };

    // Reset the input to correspond to the selection (or to be empty,
    // when not typing and nothing is selected)
    TextareaInput.prototype.reset = function (typing) {
        if (this.contextMenuPending || this.composing) { return }
        var cm = this.cm;
        if (cm.somethingSelected()) {
            this.prevInput = "";
            var content = cm.getSelection();
            this.textarea.value = content;
            if (cm.state.focused) { selectInput(this.textarea); }
            if (ie && ie_version >= 9) { this.hasSelection = content; }
        } else if (!typing) {
            this.prevInput = this.textarea.value = "";
            if (ie && ie_version >= 9) { this.hasSelection = null; }
        }
    };

    TextareaInput.prototype.getField = function () { return this.textarea };

    TextareaInput.prototype.supportsTouch = function () { return false };

    TextareaInput.prototype.focus = function () {
        if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt(this.textarea.ownerDocument) != this.textarea)) {
            try { this.textarea.focus(); }
            catch (e) { } // IE8 will throw if the textarea is display: none or not in DOM
        }
    };

    TextareaInput.prototype.blur = function () { this.textarea.blur(); };

    TextareaInput.prototype.resetPosition = function () {
        this.wrapper.style.top = this.wrapper.style.left = 0;
    };

    TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };

    // Poll for input changes, using the normal rate of polling. This
    // runs as long as the editor is focused.
    TextareaInput.prototype.slowPoll = function () {
        var this$1 = this;

        if (this.pollingFast) { return }
        this.polling.set(this.cm.options.pollInterval, function () {
            this$1.poll();
            if (this$1.cm.state.focused) { this$1.slowPoll(); }
        });
    };

    // When an event has just come in that is likely to add or change
    // something in the input textarea, we poll faster, to ensure that
    // the change appears on the screen quickly.
    TextareaInput.prototype.fastPoll = function () {
        var missed = false, input = this;
        input.pollingFast = true;
        function p() {
            var changed = input.poll();
            if (!changed && !missed) { missed = true; input.polling.set(60, p); }
            else { input.pollingFast = false; input.slowPoll(); }
        }
        input.polling.set(20, p);
    };

    // Read input from the textarea, and update the document to match.
    // When something is selected, it is present in the textarea, and
    // selected (unless it is huge, in which case a placeholder is
    // used). When nothing is selected, the cursor sits after previously
    // seen text (can be empty), which is stored in prevInput (we must
    // not reset the textarea when typing, because that breaks IME).
    TextareaInput.prototype.poll = function () {
        var this$1 = this;

        var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
        // Since this is called a *lot*, try to bail out as cheaply as
        // possible when it is clear that nothing happened. hasSelection
        // will be the case when there is a lot of text in the textarea,
        // in which case reading its value would be expensive.
        if (this.contextMenuPending || !cm.state.focused ||
            (hasSelection(input) && !prevInput && !this.composing) ||
            cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq) { return false }

        var text = input.value;
        // If nothing changed, bail.
        if (text == prevInput && !cm.somethingSelected()) { return false }
        // Work around nonsensical selection resetting in IE9/10, and
        // inexplicable appearance of private area unicode characters on
        // some key combos in Mac (#2689).
        if (ie && ie_version >= 9 && this.hasSelection === text ||
            mac && /[\uf700-\uf7ff]/.test(text)) {
            cm.display.input.reset();
            return false
        }

        if (cm.doc.sel == cm.display.selForContextMenu) {
            var first = text.charCodeAt(0);
            if (first == 0x200b && !prevInput) { prevInput = "\u200b"; }
            if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
        }
        // Find the part of the input that is actually new
        var same = 0, l = Math.min(prevInput.length, text.length);
        while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }

        runInOp(cm, function () {
            applyTextInput(cm, text.slice(same), prevInput.length - same,
                null, this$1.composing ? "*compose" : null);

            // Don't leave long text in the textarea, since it makes further polling slow
            if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = ""; }
            else { this$1.prevInput = text; }

            if (this$1.composing) {
                this$1.composing.range.clear();
                this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
                    { className: "CodeMirror-composing" });
            }
        });
        return true
    };

    TextareaInput.prototype.ensurePolled = function () {
        if (this.pollingFast && this.poll()) { this.pollingFast = false; }
    };

    TextareaInput.prototype.onKeyPress = function () {
        if (ie && ie_version >= 9) { this.hasSelection = null; }
        this.fastPoll();
    };

    TextareaInput.prototype.onContextMenu = function (e) {
        var input = this, cm = input.cm, display = cm.display, te = input.textarea;
        if (input.contextMenuPending) { input.contextMenuPending(); }
        var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
        if (!pos || presto) { return } // Opera is difficult.

        // Reset the current text selection only if the click is done outside of the selection
        // and 'resetSelectionOnContextMenu' option is true.
        var reset = cm.options.resetSelectionOnContextMenu;
        if (reset && cm.doc.sel.contains(pos) == -1) { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }

        var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
        var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();
        input.wrapper.style.cssText = "position: static";
        te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
        var oldScrollY;
        if (webkit) { oldScrollY = te.ownerDocument.defaultView.scrollY; } // Work around Chrome issue (#2712)
        display.input.focus();
        if (webkit) { te.ownerDocument.defaultView.scrollTo(null, oldScrollY); }
        display.input.reset();
        // Adds "Select all" to context menu in FF
        if (!cm.somethingSelected()) { te.value = input.prevInput = " "; }
        input.contextMenuPending = rehide;
        display.selForContextMenu = cm.doc.sel;
        clearTimeout(display.detectingSelectAll);

        // Select-all will be greyed out if there's nothing to select, so
        // this adds a zero-width space so that we can later check whether
        // it got selected.
        function prepareSelectAllHack() {
            if (te.selectionStart != null) {
                var selected = cm.somethingSelected();
                var extval = "\u200b" + (selected ? te.value : "");
                te.value = "\u21da"; // Used to catch context-menu undo
                te.value = extval;
                input.prevInput = selected ? "" : "\u200b";
                te.selectionStart = 1; te.selectionEnd = extval.length;
                // Re-set this, in case some other handler touched the
                // selection in the meantime.
                display.selForContextMenu = cm.doc.sel;
            }
        }
        function rehide() {
            if (input.contextMenuPending != rehide) { return }
            input.contextMenuPending = false;
            input.wrapper.style.cssText = oldWrapperCSS;
            te.style.cssText = oldCSS;
            if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }

            // Try to detect the user choosing select-all
            if (te.selectionStart != null) {
                if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }
                var i = 0, poll = function () {
                    if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
                        te.selectionEnd > 0 && input.prevInput == "\u200b") {
                        operation(cm, selectAll)(cm);
                    } else if (i++ < 10) {
                        display.detectingSelectAll = setTimeout(poll, 500);
                    } else {
                        display.selForContextMenu = null;
                        display.input.reset();
                    }
                };
                display.detectingSelectAll = setTimeout(poll, 200);
            }
        }

        if (ie && ie_version >= 9) { prepareSelectAllHack(); }
        if (captureRightClick) {
            e_stop(e);
            var mouseup = function () {
                off(window, "mouseup", mouseup);
                setTimeout(rehide, 20);
            };
            on(window, "mouseup", mouseup);
        } else {
            setTimeout(rehide, 50);
        }
    };

    TextareaInput.prototype.readOnlyChanged = function (val) {
        if (!val) { this.reset(); }
        this.textarea.disabled = val == "nocursor";
        this.textarea.readOnly = !!val;
    };

    TextareaInput.prototype.setUneditable = function () { };

    TextareaInput.prototype.needsContentAttribute = false;

    function fromTextArea(textarea, options) {
        options = options ? copyObj(options) : {};
        options.value = textarea.value;
        if (!options.tabindex && textarea.tabIndex) { options.tabindex = textarea.tabIndex; }
        if (!options.placeholder && textarea.placeholder) { options.placeholder = textarea.placeholder; }
        // Set autofocus to true if this textarea is focused, or if it has
        // autofocus and no other element is focused.
        if (options.autofocus == null) {
            var hasFocus = activeElt(textarea.ownerDocument);
            options.autofocus = hasFocus == textarea ||
                textarea.getAttribute("autofocus") != null && hasFocus == document.body;
        }

        function save() { textarea.value = cm.getValue(); }

        var realSubmit;
        if (textarea.form) {
            on(textarea.form, "submit", save);
            // Deplorable hack to make the submit method do the right thing.
            if (!options.leaveSubmitMethodAlone) {
                var form = textarea.form;
                realSubmit = form.submit;
                try {
                    var wrappedSubmit = form.submit = function () {
                        save();
                        form.submit = realSubmit;
                        form.submit();
                        form.submit = wrappedSubmit;
                    };
                } catch (e) { }
            }
        }

        options.finishInit = function (cm) {
            cm.save = save;
            cm.getTextArea = function () { return textarea; };
            cm.toTextArea = function () {
                cm.toTextArea = isNaN; // Prevent this from being ran twice
                save();
                textarea.parentNode.removeChild(cm.getWrapperElement());
                textarea.style.display = "";
                if (textarea.form) {
                    off(textarea.form, "submit", save);
                    if (!options.leaveSubmitMethodAlone && typeof textarea.form.submit == "function") { textarea.form.submit = realSubmit; }
                }
            };
        };

        textarea.style.display = "none";
        var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
            options);
        return cm
    }

    function addLegacyProps(CodeMirror) {
        CodeMirror.off = off;
        CodeMirror.on = on;
        CodeMirror.wheelEventPixels = wheelEventPixels;
        CodeMirror.Doc = Doc;
        CodeMirror.splitLines = splitLinesAuto;
        CodeMirror.countColumn = countColumn;
        CodeMirror.findColumn = findColumn;
        CodeMirror.isWordChar = isWordCharBasic;
        CodeMirror.Pass = Pass;
        CodeMirror.signal = signal;
        CodeMirror.Line = Line;
        CodeMirror.changeEnd = changeEnd;
        CodeMirror.scrollbarModel = scrollbarModel;
        CodeMirror.Pos = Pos;
        CodeMirror.cmpPos = cmp;
        CodeMirror.modes = modes;
        CodeMirror.mimeModes = mimeModes;
        CodeMirror.resolveMode = resolveMode;
        CodeMirror.getMode = getMode;
        CodeMirror.modeExtensions = modeExtensions;
        CodeMirror.extendMode = extendMode;
        CodeMirror.copyState = copyState;
        CodeMirror.startState = startState;
        CodeMirror.innerMode = innerMode;
        CodeMirror.commands = commands;
        CodeMirror.keyMap = keyMap;
        CodeMirror.keyName = keyName;
        CodeMirror.isModifierKey = isModifierKey;
        CodeMirror.lookupKey = lookupKey;
        CodeMirror.normalizeKeyMap = normalizeKeyMap;
        CodeMirror.StringStream = StringStream;
        CodeMirror.SharedTextMarker = SharedTextMarker;
        CodeMirror.TextMarker = TextMarker;
        CodeMirror.LineWidget = LineWidget;
        CodeMirror.e_preventDefault = e_preventDefault;
        CodeMirror.e_stopPropagation = e_stopPropagation;
        CodeMirror.e_stop = e_stop;
        CodeMirror.addClass = addClass;
        CodeMirror.contains = contains;
        CodeMirror.rmClass = rmClass;
        CodeMirror.keyNames = keyNames;
    }

    // EDITOR CONSTRUCTOR

    defineOptions(CodeMirror);

    addEditorMethods(CodeMirror);

    // Set up methods on CodeMirror's prototype to redirect to the editor's document.
    var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
    for (var prop in Doc.prototype) {
        if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0) {
            CodeMirror.prototype[prop] = (function (method) {
                return function () { return method.apply(this.doc, arguments) }
            })(Doc.prototype[prop]);
        }
    }

    eventMixin(Doc);
    CodeMirror.inputStyles = { "textarea": TextareaInput, "contenteditable": ContentEditableInput };

    // Extra arguments are stored as the mode's dependencies, which is
    // used by (legacy) mechanisms like loadmode.js to automatically
    // load a mode. (Preferred mechanism is the require/define calls.)
    CodeMirror.defineMode = function (name/*, mode, …*/) {
        if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name; }
        defineMode.apply(this, arguments);
    };

    CodeMirror.defineMIME = defineMIME;

    // Minimal default mode.
    CodeMirror.defineMode("null", function () { return ({ token: function (stream) { return stream.skipToEnd(); } }); });
    CodeMirror.defineMIME("text/plain", "null");

    // EXTENSIONS

    CodeMirror.defineExtension = function (name, func) {
        CodeMirror.prototype[name] = func;
    };
    CodeMirror.defineDocExtension = function (name, func) {
        Doc.prototype[name] = func;
    };

    CodeMirror.fromTextArea = fromTextArea;

    addLegacyProps(CodeMirror);

    CodeMirror.version = "6.65.7";

    return CodeMirror;

})));// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/5/LICENSE

(function (mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function (CodeMirror) {
    "use strict";

    CodeMirror.defineMode("javascript", function (config, parserConfig) {
        var indentUnit = config.indentUnit;
        var statementIndent = parserConfig.statementIndent;
        var jsonldMode = parserConfig.jsonld;
        var jsonMode = parserConfig.json || jsonldMode;
        var trackScope = parserConfig.trackScope !== false
        var isTS = parserConfig.typescript;
        var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;

        // Tokenizer

        var keywords = function () {
            function kw(type) { return { type: type, style: "keyword" }; }
            var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c"), D = kw("keyword d");
            var operator = kw("operator"), atom = { type: "atom", style: "atom" };

            return {
                "if": kw("if"), "while": A, "with": A, "else": B, "do": B, "try": B, "finally": B,
                "return": D, "break": D, "continue": D, "new": kw("new"), "delete": C, "void": C, "throw": C,
                "debugger": kw("debugger"), "var": kw("var"), "const": kw("var"), "let": kw("var"),
                "function": kw("function"), "catch": kw("catch"),
                "for": kw("for"), "switch": kw("switch"), "case": kw("case"), "default": kw("default"),
                "in": operator, "typeof": operator, "instanceof": operator,
                "true": atom, "false": atom, "null": atom, "undefined": atom, "NaN": atom, "Infinity": atom,
                "this": kw("this"), "class": kw("class"), "super": kw("atom"),
                "yield": C, "export": kw("export"), "import": kw("import"), "extends": C,
                "await": C
            };
        }();

        var isOperatorChar = /[+\-*&%=<>!?|~^@]/;
        var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;

        function readRegexp(stream) {
            var escaped = false, next, inSet = false;
            while ((next = stream.next()) != null) {
                if (!escaped) {
                    if (next == "/" && !inSet) return;
                    if (next == "[") inSet = true;
                    else if (inSet && next == "]") inSet = false;
                }
                escaped = !escaped && next == "\\";
            }
        }

        // Used as scratch variables to communicate multiple values without
        // consing up tons of objects.
        var type, content;
        function ret(tp, style, cont) {
            type = tp; content = cont;
            return style;
        }
        function tokenBase(stream, state) {
            var ch = stream.next();
            if (ch == '"' || ch == "'") {
                state.tokenize = tokenString(ch);
                return state.tokenize(stream, state);
            } else if (ch == "." && stream.match(/^\d[\d_]*(?:[eE][+\-]?[\d_]+)?/)) {
                return ret("number", "number");
            } else if (ch == "." && stream.match("..")) {
                return ret("spread", "meta");
            } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
                return ret(ch);
            } else if (ch == "=" && stream.eat(">")) {
                return ret("=>", "operator");
            } else if (ch == "0" && stream.match(/^(?:x[\dA-Fa-f_]+|o[0-7_]+|b[01_]+)n?/)) {
                return ret("number", "number");
            } else if (/\d/.test(ch)) {
                stream.match(/^[\d_]*(?:n|(?:\.[\d_]*)?(?:[eE][+\-]?[\d_]+)?)?/);
                return ret("number", "number");
            } else if (ch == "/") {
                if (stream.eat("*")) {
                    state.tokenize = tokenComment;
                    return tokenComment(stream, state);
                } else if (stream.eat("/")) {
                    stream.skipToEnd();
                    return ret("comment", "comment");
                } else if (expressionAllowed(stream, state, 1)) {
                    readRegexp(stream);
                    stream.match(/^\b(([gimyus])(?![gimyus]*\2))+\b/);
                    return ret("regexp", "string-2");
                } else {
                    stream.eat("=");
                    return ret("operator", "operator", stream.current());
                }
            } else if (ch == "`") {
                state.tokenize = tokenQuasi;
                return tokenQuasi(stream, state);
            } else if (ch == "#" && stream.peek() == "!") {
                stream.skipToEnd();
                return ret("meta", "meta");
            } else if (ch == "#" && stream.eatWhile(wordRE)) {
                return ret("variable", "property")
            } else if (ch == "<" && stream.match("!--") ||
                (ch == "-" && stream.match("->") && !/\S/.test(stream.string.slice(0, stream.start)))) {
                stream.skipToEnd()
                return ret("comment", "comment")
            } else if (isOperatorChar.test(ch)) {
                if (ch != ">" || !state.lexical || state.lexical.type != ">") {
                    if (stream.eat("=")) {
                        if (ch == "!" || ch == "=") stream.eat("=")
                    } else if (/[<>*+\-|&?]/.test(ch)) {
                        stream.eat(ch)
                        if (ch == ">") stream.eat(ch)
                    }
                }
                if (ch == "?" && stream.eat(".")) return ret(".")
                return ret("operator", "operator", stream.current());
            } else if (wordRE.test(ch)) {
                stream.eatWhile(wordRE);
                var word = stream.current()
                if (state.lastType != ".") {
                    if (keywords.propertyIsEnumerable(word)) {
                        var kw = keywords[word]
                        return ret(kw.type, kw.style, word)
                    }
                    if (word == "async" && stream.match(/^(\s|\/\*([^*]|\*(?!\/))*?\*\/)*[\[\(\w]/, false))
                        return ret("async", "keyword", word)
                }
                return ret("variable", "variable", word)
            }
        }

        function tokenString(quote) {
            return function (stream, state) {
                var escaped = false, next;
                if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)) {
                    state.tokenize = tokenBase;
                    return ret("jsonld-keyword", "meta");
                }
                while ((next = stream.next()) != null) {
                    if (next == quote && !escaped) break;
                    escaped = !escaped && next == "\\";
                }
                if (!escaped) state.tokenize = tokenBase;
                return ret("string", "string");
            };
        }

        function tokenComment(stream, state) {
            var maybeEnd = false, ch;
            while (ch = stream.next()) {
                if (ch == "/" && maybeEnd) {
                    state.tokenize = tokenBase;
                    break;
                }
                maybeEnd = (ch == "*");
            }
            return ret("comment", "comment");
        }

        function tokenQuasi(stream, state) {
            var escaped = false, next;
            while ((next = stream.next()) != null) {
                if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
                    state.tokenize = tokenBase;
                    break;
                }
                escaped = !escaped && next == "\\";
            }
            return ret("quasi", "string-2", stream.current());
        }

        var brackets = "([{}])";
        // This is a crude lookahead trick to try and notice that we're
        // parsing the argument patterns for a fat-arrow function before we
        // actually hit the arrow token. It only works if the arrow is on
        // the same line as the arguments and there's no strange noise
        // (comments) in between. Fallback is to only notice when we hit the
        // arrow, and not declare the arguments as locals for the arrow
        // body.
        function findFatArrow(stream, state) {
            if (state.fatArrowAt) state.fatArrowAt = null;
            var arrow = stream.string.indexOf("=>", stream.start);
            if (arrow < 0) return;

            if (isTS) { // Try to skip TypeScript return type declarations after the arguments
                var m = /:\s*(?:\w+(?:<[^>]*>|\[\])?|\{[^}]*\})\s*$/.exec(stream.string.slice(stream.start, arrow))
                if (m) arrow = m.index
            }

            var depth = 0, sawSomething = false;
            for (var pos = arrow - 1; pos >= 0; --pos) {
                var ch = stream.string.charAt(pos);
                var bracket = brackets.indexOf(ch);
                if (bracket >= 0 && bracket < 3) {
                    if (!depth) { ++pos; break; }
                    if (--depth == 0) { if (ch == "(") sawSomething = true; break; }
                } else if (bracket >= 3 && bracket < 6) {
                    ++depth;
                } else if (wordRE.test(ch)) {
                    sawSomething = true;
                } else if (/["'\/`]/.test(ch)) {
                    for (; ; --pos) {
                        if (pos == 0) return
                        var next = stream.string.charAt(pos - 1)
                        if (next == ch && stream.string.charAt(pos - 2) != "\\") { pos--; break }
                    }
                } else if (sawSomething && !depth) {
                    ++pos;
                    break;
                }
            }
            if (sawSomething && !depth) state.fatArrowAt = pos;
        }

        // Parser

        var atomicTypes = {
            "atom": true, "number": true, "variable": true, "string": true,
            "regexp": true, "this": true, "import": true, "jsonld-keyword": true
        };

        function JSLexical(indented, column, type, align, prev, info) {
            this.indented = indented;
            this.column = column;
            this.type = type;
            this.prev = prev;
            this.info = info;
            if (align != null) this.align = align;
        }

        function inScope(state, varname) {
            if (!trackScope) return false
            for (var v = state.localVars; v; v = v.next)
                if (v.name == varname) return true;
            for (var cx = state.context; cx; cx = cx.prev) {
                for (var v = cx.vars; v; v = v.next)
                    if (v.name == varname) return true;
            }
        }

        function parseJS(state, style, type, content, stream) {
            var cc = state.cc;
            // Communicate our context to the combinators.
            // (Less wasteful than consing up a hundred closures on every call.)
            cx.state = state; cx.stream = stream; cx.marked = null, cx.cc = cc; cx.style = style;

            if (!state.lexical.hasOwnProperty("align"))
                state.lexical.align = true;

            while (true) {
                var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
                if (combinator(type, content)) {
                    while (cc.length && cc[cc.length - 1].lex)
                        cc.pop()();
                    if (cx.marked) return cx.marked;
                    if (type == "variable" && inScope(state, content)) return "variable-2";
                    return style;
                }
            }
        }

        // Combinator utils

        var cx = { state: null, column: null, marked: null, cc: null };
        function pass() {
            for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
        }
        function cont() {
            pass.apply(null, arguments);
            return true;
        }
        function inList(name, list) {
            for (var v = list; v; v = v.next) if (v.name == name) return true
            return false;
        }
        function register(varname) {
            var state = cx.state;
            cx.marked = "def";
            if (!trackScope) return
            if (state.context) {
                if (state.lexical.info == "var" && state.context && state.context.block) {
                    // FIXME function decls are also not block scoped
                    var newContext = registerVarScoped(varname, state.context)
                    if (newContext != null) {
                        state.context = newContext
                        return
                    }
                } else if (!inList(varname, state.localVars)) {
                    state.localVars = new Var(varname, state.localVars)
                    return
                }
            }
            // Fall through means this is global
            if (parserConfig.globalVars && !inList(varname, state.globalVars))
                state.globalVars = new Var(varname, state.globalVars)
        }
        function registerVarScoped(varname, context) {
            if (!context) {
                return null
            } else if (context.block) {
                var inner = registerVarScoped(varname, context.prev)
                if (!inner) return null
                if (inner == context.prev) return context
                return new Context(inner, context.vars, true)
            } else if (inList(varname, context.vars)) {
                return context
            } else {
                return new Context(context.prev, new Var(varname, context.vars), false)
            }
        }

        function isModifier(name) {
            return name == "public" || name == "private" || name == "protected" || name == "abstract" || name == "readonly"
        }

        // Combinators

        function Context(prev, vars, block) { this.prev = prev; this.vars = vars; this.block = block }
        function Var(name, next) { this.name = name; this.next = next }

        var defaultVars = new Var("this", new Var("arguments", null))
        function pushcontext() {
            cx.state.context = new Context(cx.state.context, cx.state.localVars, false)
            cx.state.localVars = defaultVars
        }
        function pushblockcontext() {
            cx.state.context = new Context(cx.state.context, cx.state.localVars, true)
            cx.state.localVars = null
        }
        pushcontext.lex = pushblockcontext.lex = true
        function popcontext() {
            cx.state.localVars = cx.state.context.vars
            cx.state.context = cx.state.context.prev
        }
        popcontext.lex = true
        function pushlex(type, info) {
            var result = function () {
                var state = cx.state, indent = state.indented;
                if (state.lexical.type == "stat") indent = state.lexical.indented;
                else for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev)
                    indent = outer.indented;
                state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
            };
            result.lex = true;
            return result;
        }
        function poplex() {
            var state = cx.state;
            if (state.lexical.prev) {
                if (state.lexical.type == ")")
                    state.indented = state.lexical.indented;
                state.lexical = state.lexical.prev;
            }
        }
        poplex.lex = true;

        function expect(wanted) {
            function exp(type) {
                if (type == wanted) return cont();
                else if (wanted == ";" || type == "}" || type == ")" || type == "]") return pass();
                else return cont(exp);
            };
            return exp;
        }

        function statement(type, value) {
            if (type == "var") return cont(pushlex("vardef", value), vardef, expect(";"), poplex);
            if (type == "keyword a") return cont(pushlex("form"), parenExpr, statement, poplex);
            if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
            if (type == "keyword d") return cx.stream.match(/^\s*$/, false) ? cont() : cont(pushlex("stat"), maybeexpression, expect(";"), poplex);
            if (type == "debugger") return cont(expect(";"));
            if (type == "{") return cont(pushlex("}"), pushblockcontext, block, poplex, popcontext);
            if (type == ";") return cont();
            if (type == "if") {
                if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex)
                    cx.state.cc.pop()();
                return cont(pushlex("form"), parenExpr, statement, poplex, maybeelse);
            }
            if (type == "function") return cont(functiondef);
            if (type == "for") return cont(pushlex("form"), pushblockcontext, forspec, statement, popcontext, poplex);
            if (type == "class" || (isTS && value == "interface")) {
                cx.marked = "keyword"
                return cont(pushlex("form", type == "class" ? type : value), className, poplex)
            }
            if (type == "variable") {
                if (isTS && value == "declare") {
                    cx.marked = "keyword"
                    return cont(statement)
                } else if (isTS && (value == "module" || value == "enum" || value == "type") && cx.stream.match(/^\s*\w/, false)) {
                    cx.marked = "keyword"
                    if (value == "enum") return cont(enumdef);
                    else if (value == "type") return cont(typename, expect("operator"), typeexpr, expect(";"));
                    else return cont(pushlex("form"), pattern, expect("{"), pushlex("}"), block, poplex, poplex)
                } else if (isTS && value == "namespace") {
                    cx.marked = "keyword"
                    return cont(pushlex("form"), expression, statement, poplex)
                } else if (isTS && value == "abstract") {
                    cx.marked = "keyword"
                    return cont(statement)
                } else {
                    return cont(pushlex("stat"), maybelabel);
                }
            }
            if (type == "switch") return cont(pushlex("form"), parenExpr, expect("{"), pushlex("}", "switch"), pushblockcontext,
                block, poplex, poplex, popcontext);
            if (type == "case") return cont(expression, expect(":"));
            if (type == "default") return cont(expect(":"));
            if (type == "catch") return cont(pushlex("form"), pushcontext, maybeCatchBinding, statement, poplex, popcontext);
            if (type == "export") return cont(pushlex("stat"), afterExport, poplex);
            if (type == "import") return cont(pushlex("stat"), afterImport, poplex);
            if (type == "async") return cont(statement)
            if (value == "@") return cont(expression, statement)
            return pass(pushlex("stat"), expression, expect(";"), poplex);
        }
        function maybeCatchBinding(type) {
            if (type == "(") return cont(funarg, expect(")"))
        }
        function expression(type, value) {
            return expressionInner(type, value, false);
        }
        function expressionNoComma(type, value) {
            return expressionInner(type, value, true);
        }
        function parenExpr(type) {
            if (type != "(") return pass()
            return cont(pushlex(")"), maybeexpression, expect(")"), poplex)
        }
        function expressionInner(type, value, noComma) {
            if (cx.state.fatArrowAt == cx.stream.start) {
                var body = noComma ? arrowBodyNoComma : arrowBody;
                if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, expect("=>"), body, popcontext);
                else if (type == "variable") return pass(pushcontext, pattern, expect("=>"), body, popcontext);
            }

            var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
            if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
            if (type == "function") return cont(functiondef, maybeop);
            if (type == "class" || (isTS && value == "interface")) { cx.marked = "keyword"; return cont(pushlex("form"), classExpression, poplex); }
            if (type == "keyword c" || type == "async") return cont(noComma ? expressionNoComma : expression);
            if (type == "(") return cont(pushlex(")"), maybeexpression, expect(")"), poplex, maybeop);
            if (type == "operator" || type == "spread") return cont(noComma ? expressionNoComma : expression);
            if (type == "[") return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
            if (type == "{") return contCommasep(objprop, "}", null, maybeop);
            if (type == "quasi") return pass(quasi, maybeop);
            if (type == "new") return cont(maybeTarget(noComma));
            return cont();
        }
        function maybeexpression(type) {
            if (type.match(/[;\}\)\],]/)) return pass();
            return pass(expression);
        }

        function maybeoperatorComma(type, value) {
            if (type == ",") return cont(maybeexpression);
            return maybeoperatorNoComma(type, value, false);
        }
        function maybeoperatorNoComma(type, value, noComma) {
            var me = noComma == false ? maybeoperatorComma : maybeoperatorNoComma;
            var expr = noComma == false ? expression : expressionNoComma;
            if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
            if (type == "operator") {
                if (/\+\+|--/.test(value) || isTS && value == "!") return cont(me);
                if (isTS && value == "<" && cx.stream.match(/^([^<>]|<[^<>]*>)*>\s*\(/, false))
                    return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, me);
                if (value == "?") return cont(expression, expect(":"), expr);
                return cont(expr);
            }
            if (type == "quasi") { return pass(quasi, me); }
            if (type == ";") return;
            if (type == "(") return contCommasep(expressionNoComma, ")", "call", me);
            if (type == ".") return cont(property, me);
            if (type == "[") return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
            if (isTS && value == "as") { cx.marked = "keyword"; return cont(typeexpr, me) }
            if (type == "regexp") {
                cx.state.lastType = cx.marked = "operator"
                cx.stream.backUp(cx.stream.pos - cx.stream.start - 1)
                return cont(expr)
            }
        }
        function quasi(type, value) {
            if (type != "quasi") return pass();
            if (value.slice(value.length - 2) != "${") return cont(quasi);
            return cont(maybeexpression, continueQuasi);
        }
        function continueQuasi(type) {
            if (type == "}") {
                cx.marked = "string-2";
                cx.state.tokenize = tokenQuasi;
                return cont(quasi);
            }
        }
        function arrowBody(type) {
            findFatArrow(cx.stream, cx.state);
            return pass(type == "{" ? statement : expression);
        }
        function arrowBodyNoComma(type) {
            findFatArrow(cx.stream, cx.state);
            return pass(type == "{" ? statement : expressionNoComma);
        }
        function maybeTarget(noComma) {
            return function (type) {
                if (type == ".") return cont(noComma ? targetNoComma : target);
                else if (type == "variable" && isTS) return cont(maybeTypeArgs, noComma ? maybeoperatorNoComma : maybeoperatorComma)
                else return pass(noComma ? expressionNoComma : expression);
            };
        }
        function target(_, value) {
            if (value == "target") { cx.marked = "keyword"; return cont(maybeoperatorComma); }
        }
        function targetNoComma(_, value) {
            if (value == "target") { cx.marked = "keyword"; return cont(maybeoperatorNoComma); }
        }
        function maybelabel(type) {
            if (type == ":") return cont(poplex, statement);
            return pass(maybeoperatorComma, expect(";"), poplex);
        }
        function property(type) {
            if (type == "variable") { cx.marked = "property"; return cont(); }
        }
        function objprop(type, value) {
            if (type == "async") {
                cx.marked = "property";
                return cont(objprop);
            } else if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property";
                if (value == "get" || value == "set") return cont(getterSetter);
                var m // Work around fat-arrow-detection complication for detecting typescript typed arrow params
                if (isTS && cx.state.fatArrowAt == cx.stream.start && (m = cx.stream.match(/^\s*:\s*/, false)))
                    cx.state.fatArrowAt = cx.stream.pos + m[0].length
                return cont(afterprop);
            } else if (type == "number" || type == "string") {
                cx.marked = jsonldMode ? "property" : (cx.style + " property");
                return cont(afterprop);
            } else if (type == "jsonld-keyword") {
                return cont(afterprop);
            } else if (isTS && isModifier(value)) {
                cx.marked = "keyword"
                return cont(objprop)
            } else if (type == "[") {
                return cont(expression, maybetype, expect("]"), afterprop);
            } else if (type == "spread") {
                return cont(expressionNoComma, afterprop);
            } else if (value == "*") {
                cx.marked = "keyword";
                return cont(objprop);
            } else if (type == ":") {
                return pass(afterprop)
            }
        }
        function getterSetter(type) {
            if (type != "variable") return pass(afterprop);
            cx.marked = "property";
            return cont(functiondef);
        }
        function afterprop(type) {
            if (type == ":") return cont(expressionNoComma);
            if (type == "(") return pass(functiondef);
        }
        function commasep(what, end, sep) {
            function proceed(type, value) {
                if (sep ? sep.indexOf(type) > -1 : type == ",") {
                    var lex = cx.state.lexical;
                    if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
                    return cont(function (type, value) {
                        if (type == end || value == end) return pass()
                        return pass(what)
                    }, proceed);
                }
                if (type == end || value == end) return cont();
                if (sep && sep.indexOf(";") > -1) return pass(what)
                return cont(expect(end));
            }
            return function (type, value) {
                if (type == end || value == end) return cont();
                return pass(what, proceed);
            };
        }
        function contCommasep(what, end, info) {
            for (var i = 3; i < arguments.length; i++)
                cx.cc.push(arguments[i]);
            return cont(pushlex(end, info), commasep(what, end), poplex);
        }
        function block(type) {
            if (type == "}") return cont();
            return pass(statement, block);
        }
        function maybetype(type, value) {
            if (isTS) {
                if (type == ":") return cont(typeexpr);
                if (value == "?") return cont(maybetype);
            }
        }
        function maybetypeOrIn(type, value) {
            if (isTS && (type == ":" || value == "in")) return cont(typeexpr)
        }
        function mayberettype(type) {
            if (isTS && type == ":") {
                if (cx.stream.match(/^\s*\w+\s+is\b/, false)) return cont(expression, isKW, typeexpr)
                else return cont(typeexpr)
            }
        }
        function isKW(_, value) {
            if (value == "is") {
                cx.marked = "keyword"
                return cont()
            }
        }
        function typeexpr(type, value) {
            if (value == "keyof" || value == "typeof" || value == "infer" || value == "readonly") {
                cx.marked = "keyword"
                return cont(value == "typeof" ? expressionNoComma : typeexpr)
            }
            if (type == "variable" || value == "void") {
                cx.marked = "type"
                return cont(afterType)
            }
            if (value == "|" || value == "&") return cont(typeexpr)
            if (type == "string" || type == "number" || type == "atom") return cont(afterType);
            if (type == "[") return cont(pushlex("]"), commasep(typeexpr, "]", ","), poplex, afterType)
            if (type == "{") return cont(pushlex("}"), typeprops, poplex, afterType)
            if (type == "(") return cont(commasep(typearg, ")"), maybeReturnType, afterType)
            if (type == "<") return cont(commasep(typeexpr, ">"), typeexpr)
            if (type == "quasi") { return pass(quasiType, afterType); }
        }
        function maybeReturnType(type) {
            if (type == "=>") return cont(typeexpr)
        }
        function typeprops(type) {
            if (type.match(/[\}\)\]]/)) return cont()
            if (type == "," || type == ";") return cont(typeprops)
            return pass(typeprop, typeprops)
        }
        function typeprop(type, value) {
            if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property"
                return cont(typeprop)
            } else if (value == "?" || type == "number" || type == "string") {
                return cont(typeprop)
            } else if (type == ":") {
                return cont(typeexpr)
            } else if (type == "[") {
                return cont(expect("variable"), maybetypeOrIn, expect("]"), typeprop)
            } else if (type == "(") {
                return pass(functiondecl, typeprop)
            } else if (!type.match(/[;\}\)\],]/)) {
                return cont()
            }
        }
        function quasiType(type, value) {
            if (type != "quasi") return pass();
            if (value.slice(value.length - 2) != "${") return cont(quasiType);
            return cont(typeexpr, continueQuasiType);
        }
        function continueQuasiType(type) {
            if (type == "}") {
                cx.marked = "string-2";
                cx.state.tokenize = tokenQuasi;
                return cont(quasiType);
            }
        }
        function typearg(type, value) {
            if (type == "variable" && cx.stream.match(/^\s*[?:]/, false) || value == "?") return cont(typearg)
            if (type == ":") return cont(typeexpr)
            if (type == "spread") return cont(typearg)
            return pass(typeexpr)
        }
        function afterType(type, value) {
            if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
            if (value == "|" || type == "." || value == "&") return cont(typeexpr)
            if (type == "[") return cont(typeexpr, expect("]"), afterType)
            if (value == "extends" || value == "implements") { cx.marked = "keyword"; return cont(typeexpr) }
            if (value == "?") return cont(typeexpr, expect(":"), typeexpr)
        }
        function maybeTypeArgs(_, value) {
            if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
        }
        function typeparam() {
            return pass(typeexpr, maybeTypeDefault)
        }
        function maybeTypeDefault(_, value) {
            if (value == "=") return cont(typeexpr)
        }
        function vardef(_, value) {
            if (value == "enum") { cx.marked = "keyword"; return cont(enumdef) }
            return pass(pattern, maybetype, maybeAssign, vardefCont);
        }
        function pattern(type, value) {
            if (isTS && isModifier(value)) { cx.marked = "keyword"; return cont(pattern) }
            if (type == "variable") { register(value); return cont(); }
            if (type == "spread") return cont(pattern);
            if (type == "[") return contCommasep(eltpattern, "]");
            if (type == "{") return contCommasep(proppattern, "}");
        }
        function proppattern(type, value) {
            if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
                register(value);
                return cont(maybeAssign);
            }
            if (type == "variable") cx.marked = "property";
            if (type == "spread") return cont(pattern);
            if (type == "}") return pass();
            if (type == "[") return cont(expression, expect(']'), expect(':'), proppattern);
            return cont(expect(":"), pattern, maybeAssign);
        }
        function eltpattern() {
            return pass(pattern, maybeAssign)
        }
        function maybeAssign(_type, value) {
            if (value == "=") return cont(expressionNoComma);
        }
        function vardefCont(type) {
            if (type == ",") return cont(vardef);
        }
        function maybeelse(type, value) {
            if (type == "keyword b" && value == "else") return cont(pushlex("form", "else"), statement, poplex);
        }
        function forspec(type, value) {
            if (value == "await") return cont(forspec);
            if (type == "(") return cont(pushlex(")"), forspec1, poplex);
        }
        function forspec1(type) {
            if (type == "var") return cont(vardef, forspec2);
            if (type == "variable") return cont(forspec2);
            return pass(forspec2)
        }
        function forspec2(type, value) {
            if (type == ")") return cont()
            if (type == ";") return cont(forspec2)
            if (value == "in" || value == "of") { cx.marked = "keyword"; return cont(expression, forspec2) }
            return pass(expression, forspec2)
        }
        function functiondef(type, value) {
            if (value == "*") { cx.marked = "keyword"; return cont(functiondef); }
            if (type == "variable") { register(value); return cont(functiondef); }
            if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, statement, popcontext);
            if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondef)
        }
        function functiondecl(type, value) {
            if (value == "*") { cx.marked = "keyword"; return cont(functiondecl); }
            if (type == "variable") { register(value); return cont(functiondecl); }
            if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, popcontext);
            if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondecl)
        }
        function typename(type, value) {
            if (type == "keyword" || type == "variable") {
                cx.marked = "type"
                return cont(typename)
            } else if (value == "<") {
                return cont(pushlex(">"), commasep(typeparam, ">"), poplex)
            }
        }
        function funarg(type, value) {
            if (value == "@") cont(expression, funarg)
            if (type == "spread") return cont(funarg);
            if (isTS && isModifier(value)) { cx.marked = "keyword"; return cont(funarg); }
            if (isTS && type == "this") return cont(maybetype, maybeAssign)
            return pass(pattern, maybetype, maybeAssign);
        }
        function classExpression(type, value) {
            // Class expressions may have an optional name.
            if (type == "variable") return className(type, value);
            return classNameAfter(type, value);
        }
        function className(type, value) {
            if (type == "variable") { register(value); return cont(classNameAfter); }
        }
        function classNameAfter(type, value) {
            if (value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, classNameAfter)
            if (value == "extends" || value == "implements" || (isTS && type == ",")) {
                if (value == "implements") cx.marked = "keyword";
                return cont(isTS ? typeexpr : expression, classNameAfter);
            }
            if (type == "{") return cont(pushlex("}"), classBody, poplex);
        }
        function classBody(type, value) {
            if (type == "async" ||
                (type == "variable" &&
                    (value == "static" || value == "get" || value == "set" || (isTS && isModifier(value))) &&
                    cx.stream.match(/^\s+[\w$\xa1-\uffff]/, false))) {
                cx.marked = "keyword";
                return cont(classBody);
            }
            if (type == "variable" || cx.style == "keyword") {
                cx.marked = "property";
                return cont(classfield, classBody);
            }
            if (type == "number" || type == "string") return cont(classfield, classBody);
            if (type == "[")
                return cont(expression, maybetype, expect("]"), classfield, classBody)
            if (value == "*") {
                cx.marked = "keyword";
                return cont(classBody);
            }
            if (isTS && type == "(") return pass(functiondecl, classBody)
            if (type == ";" || type == ",") return cont(classBody);
            if (type == "}") return cont();
            if (value == "@") return cont(expression, classBody)
        }
        function classfield(type, value) {
            if (value == "!") return cont(classfield)
            if (value == "?") return cont(classfield)
            if (type == ":") return cont(typeexpr, maybeAssign)
            if (value == "=") return cont(expressionNoComma)
            var context = cx.state.lexical.prev, isInterface = context && context.info == "interface"
            return pass(isInterface ? functiondecl : functiondef)
        }
        function afterExport(type, value) {
            if (value == "*") { cx.marked = "keyword"; return cont(maybeFrom, expect(";")); }
            if (value == "default") { cx.marked = "keyword"; return cont(expression, expect(";")); }
            if (type == "{") return cont(commasep(exportField, "}"), maybeFrom, expect(";"));
            return pass(statement);
        }
        function exportField(type, value) {
            if (value == "as") { cx.marked = "keyword"; return cont(expect("variable")); }
            if (type == "variable") return pass(expressionNoComma, exportField);
        }
        function afterImport(type) {
            if (type == "string") return cont();
            if (type == "(") return pass(expression);
            if (type == ".") return pass(maybeoperatorComma);
            return pass(importSpec, maybeMoreImports, maybeFrom);
        }
        function importSpec(type, value) {
            if (type == "{") return contCommasep(importSpec, "}");
            if (type == "variable") register(value);
            if (value == "*") cx.marked = "keyword";
            return cont(maybeAs);
        }
        function maybeMoreImports(type) {
            if (type == ",") return cont(importSpec, maybeMoreImports)
        }
        function maybeAs(_type, value) {
            if (value == "as") { cx.marked = "keyword"; return cont(importSpec); }
        }
        function maybeFrom(_type, value) {
            if (value == "from") { cx.marked = "keyword"; return cont(expression); }
        }
        function arrayLiteral(type) {
            if (type == "]") return cont();
            return pass(commasep(expressionNoComma, "]"));
        }
        function enumdef() {
            return pass(pushlex("form"), pattern, expect("{"), pushlex("}"), commasep(enummember, "}"), poplex, poplex)
        }
        function enummember() {
            return pass(pattern, maybeAssign);
        }

        function isContinuedStatement(state, textAfter) {
            return state.lastType == "operator" || state.lastType == "," ||
                isOperatorChar.test(textAfter.charAt(0)) ||
                /[,.]/.test(textAfter.charAt(0));
        }

        function expressionAllowed(stream, state, backUp) {
            return state.tokenize == tokenBase &&
                /^(?:operator|sof|keyword [bcd]|case|new|export|default|spread|[\[{}\(,;:]|=>)$/.test(state.lastType) ||
                (state.lastType == "quasi" && /\{\s*$/.test(stream.string.slice(0, stream.pos - (backUp || 0))))
        }

        // Interface

        return {
            startState: function (basecolumn) {
                var state = {
                    tokenize: tokenBase,
                    lastType: "sof",
                    cc: [],
                    lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
                    localVars: parserConfig.localVars,
                    context: parserConfig.localVars && new Context(null, null, false),
                    indented: basecolumn || 0
                };
                if (parserConfig.globalVars && typeof parserConfig.globalVars == "object")
                    state.globalVars = parserConfig.globalVars;
                return state;
            },

            token: function (stream, state) {
                if (stream.sol()) {
                    if (!state.lexical.hasOwnProperty("align"))
                        state.lexical.align = false;
                    state.indented = stream.indentation();
                    findFatArrow(stream, state);
                }
                if (state.tokenize != tokenComment && stream.eatSpace()) return null;
                var style = state.tokenize(stream, state);
                if (type == "comment") return style;
                state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
                return parseJS(state, style, type, content, stream);
            },

            indent: function (state, textAfter) {
                if (state.tokenize == tokenComment || state.tokenize == tokenQuasi) return CodeMirror.Pass;
                if (state.tokenize != tokenBase) return 0;
                var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical, top
                // Kludge to prevent 'maybelse' from blocking lexical scope pops
                if (!/^\s*else\b/.test(textAfter)) for (var i = state.cc.length - 1; i >= 0; --i) {
                    var c = state.cc[i];
                    if (c == poplex) lexical = lexical.prev;
                    else if (c != maybeelse && c != popcontext) break;
                }
                while ((lexical.type == "stat" || lexical.type == "form") &&
                    (firstChar == "}" || ((top = state.cc[state.cc.length - 1]) &&
                        (top == maybeoperatorComma || top == maybeoperatorNoComma) &&
                        !/^[,\.=+\-*:?[\(]/.test(textAfter))))
                    lexical = lexical.prev;
                if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
                    lexical = lexical.prev;
                var type = lexical.type, closing = firstChar == type;

                if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? lexical.info.length + 1 : 0);
                else if (type == "form" && firstChar == "{") return lexical.indented;
                else if (type == "form") return lexical.indented + indentUnit;
                else if (type == "stat")
                    return lexical.indented + (isContinuedStatement(state, textAfter) ? statementIndent || indentUnit : 0);
                else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
                    return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
                else if (lexical.align) return lexical.column + (closing ? 0 : 1);
                else return lexical.indented + (closing ? 0 : indentUnit);
            },

            electricInput: /^\s*(?:case .*?:|default:|\{|\})$/,
            blockCommentStart: jsonMode ? null : "/*",
            blockCommentEnd: jsonMode ? null : "*/",
            blockCommentContinue: jsonMode ? null : " * ",
            lineComment: jsonMode ? null : "//",
            fold: "brace",
            closeBrackets: "()[]{}''\"\"``",

            helperType: jsonMode ? "json" : "javascript",
            jsonldMode: jsonldMode,
            jsonMode: jsonMode,

            expressionAllowed: expressionAllowed,

            skipExpression: function (state) {
                parseJS(state, "atom", "atom", "true", new CodeMirror.StringStream("", 2, null))
            }
        };
    });

    CodeMirror.registerHelper("wordChars", "javascript", /[\w$]/);

    CodeMirror.defineMIME("text/javascript", "javascript");
    CodeMirror.defineMIME("text/ecmascript", "javascript");
    CodeMirror.defineMIME("application/javascript", "javascript");
    CodeMirror.defineMIME("application/x-javascript", "javascript");
    CodeMirror.defineMIME("application/ecmascript", "javascript");
    CodeMirror.defineMIME("application/json", { name: "javascript", json: true });
    CodeMirror.defineMIME("application/x-json", { name: "javascript", json: true });
    CodeMirror.defineMIME("application/manifest+json", { name: "javascript", json: true })
    CodeMirror.defineMIME("application/ld+json", { name: "javascript", jsonld: true });
    CodeMirror.defineMIME("text/typescript", { name: "javascript", typescript: true });
    CodeMirror.defineMIME("application/typescript", { name: "javascript", typescript: true });

});