DevTools: Split off SourcesTextEditor from CodeMirrorTextEditor

third_party/WebKit/Source/devtools/front_end/source_frame/SourcesTextEditor.js

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @constructor
+ * @extends {WebInspector.CodeMirrorTextEditor}
+ * @param {!WebInspector.SourcesTextEditorDelegate} delegate
+ */
+WebInspector.SourcesTextEditor = function(delegate)
+{
+    WebInspector.CodeMirrorTextEditor.call(this);
+
+    this.codeMirror().addKeyMap({
+        "Enter": "smartNewlineAndIndent",
+        "Esc": "sourcesDismiss"
+    });
+
+    this._delegate = delegate;
+
+    this.codeMirror().on("changes", this._changesForDelegate.bind(this));
+    this.codeMirror().on("cursorActivity", this._cursorActivity.bind(this));
+    this.codeMirror().on("gutterClick", this._gutterClick.bind(this));
+    this.codeMirror().on("scroll", this._scroll.bind(this));
+    this.codeMirror().on("focus", this._focus.bind(this));
+    this.codeMirror().on("beforeSelectionChange", this._beforeSelectionChangeForDelegate.bind(this));
+    this.element.addEventListener("contextmenu", this._contextMenu.bind(this), false);
+
+    this._blockIndentController = new WebInspector.SourcesTextEditor.BlockIndentController(this.codeMirror());
+    this._tokenHighlighter = new WebInspector.SourcesTextEditor.TokenHighlighter(this, this.codeMirror());
+
+    /** @type {!Array<string>} */
+    this._gutters = ["CodeMirror-linenumbers"];
+
+    /**
+     * @this {WebInspector.SourcesTextEditor}
+     */
+    function updateAnticipateJumpFlag(value)
+    {
+        this._isHandlingMouseDownEvent = value;
+    }
+
+    this.element.addEventListener("mousedown", updateAnticipateJumpFlag.bind(this, true), true);
+    this.element.addEventListener("mousedown", updateAnticipateJumpFlag.bind(this, false), false);
+    WebInspector.moduleSetting("textEditorIndent").addChangeListener(this._onUpdateEditorIndentation, this);
+    WebInspector.moduleSetting("textEditorAutoDetectIndent").addChangeListener(this._onUpdateEditorIndentation, this);
+    WebInspector.moduleSetting("showWhitespacesInEditor").addChangeListener(this._updateWhitespace, this);
+
+    this._onUpdateEditorIndentation();
+    this._setupWhitespaceHighlight();
+}
+WebInspector.SourcesTextEditor.prototype = {
+
+    /**
+     * @return {boolean}
+     */
+    _isSearchActive: function()
+    {
+        return !!this._tokenHighlighter.highlightedRegex();
+    },
+
+    /**
+     * @param {!RegExp} regex
+     * @param {?WebInspector.TextRange} range
+     */
+    highlightSearchResults: function(regex, range)
+    {
+        /**
+         * @this {WebInspector.CodeMirrorTextEditor}
+         */
+        function innerHighlightRegex()
+        {
+            if (range) {
+                this.scrollLineIntoView(range.startLine);
+                if (range.endColumn > WebInspector.CodeMirrorTextEditor.maxHighlightLength)
+                    this.setSelection(range);
+                else
+                    this.setSelection(WebInspector.TextRange.createFromLocation(range.startLine, range.startColumn));
+            }
+            this._tokenHighlighter.highlightSearchResults(regex, range);
+        }
+
+        if (!this._selectionBeforeSearch)
+            this._selectionBeforeSearch = this.selection();
+
+        this.codeMirror().operation(innerHighlightRegex.bind(this));
+    },
+
+    cancelSearchResultsHighlight: function()
+    {
+        this.codeMirror().operation(this._tokenHighlighter.highlightSelectedTokens.bind(this._tokenHighlighter));
+
+        if (this._selectionBeforeSearch) {
+            this._reportJump(this._selectionBeforeSearch, this.selection());
+            delete this._selectionBeforeSearch;
+        }
+    },
+
+    /**
+     * @param {!Object} highlightDescriptor
+     */
+    removeHighlight: function(highlightDescriptor)
+    {
+        highlightDescriptor.clear();
+    },
+
+    /**
+     * @param {!WebInspector.TextRange} range
+     * @param {string} cssClass
+     * @return {!Object}
+     */
+    highlightRange: function(range, cssClass)
+    {
+        cssClass = "CodeMirror-persist-highlight " + cssClass;
+        var pos = WebInspector.CodeMirrorUtils.toPos(range);
+        ++pos.end.ch;
+        return this.codeMirror().markText(pos.start, pos.end, {
+            className: cssClass,
+            startStyle: cssClass + "-start",
+            endStyle: cssClass + "-end"
+        });
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {boolean} disabled
+     * @param {boolean} conditional
+     */
+    addBreakpoint: function(lineNumber, disabled, conditional)
+    {
+        if (lineNumber < 0 || lineNumber >= this.codeMirror().lineCount())
+            return;
+
+        var className = "cm-breakpoint" + (conditional ? " cm-breakpoint-conditional" : "") + (disabled ? " cm-breakpoint-disabled" : "");
+        this.codeMirror().addLineClass(lineNumber, "wrap", className);
+    },
+
+    /**
+     * @param {number} lineNumber
+     */
+    removeBreakpoint: function(lineNumber)
+    {
+        if (lineNumber < 0 || lineNumber >= this.codeMirror().lineCount())
+            return;
+
+        var wrapClasses = this.codeMirror().getLineHandle(lineNumber).wrapClass;
+        if (!wrapClasses)
+            return;
+
+        var classes = wrapClasses.split(" ");
+        for (var i = 0; i < classes.length; ++i) {
+            if (classes[i].startsWith("cm-breakpoint"))
+                this.codeMirror().removeLineClass(lineNumber, "wrap", classes[i]);
+        }
+    },
+
+    /**
+     * @param {string} type
+     * @param {boolean} leftToNumbers
+     */
+    installGutter: function(type, leftToNumbers)
+    {
+        if (this._gutters.indexOf(type) !== -1)
+            return;
+
+        if (leftToNumbers)
+            this._gutters.unshift(type);
+        else
+            this._gutters.push(type);
+
+        this.codeMirror().setOption("gutters", this._gutters.slice());
+        this.codeMirror().refresh();
+    },
+
+    /**
+     * @param {string} type
+     */
+    uninstallGutter: function(type)
+    {
+        this._gutters = this._gutters.filter(gutter => gutter !== type);
+        this.codeMirror().setOption("gutters", this._gutters.slice());
+        this.codeMirror().refresh();
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {string} type
+     * @param {?Element} element
+     */
+    setGutterDecoration: function(lineNumber, type, element)
+    {
+        console.assert(this._gutters.indexOf(type) !== -1, "Cannot decorate unexisting gutter.")
+        this.codeMirror().setGutterMarker(lineNumber, type, element);
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {number} columnNumber
+     */
+    setExecutionLocation: function(lineNumber, columnNumber)
+    {
+        this.clearPositionHighlight();
+
+        this._executionLine = this.codeMirror().getLineHandle(lineNumber);
+        if (!this._executionLine)
+            return;
+
+        this.codeMirror().addLineClass(this._executionLine, "wrap", "cm-execution-line");
+        this._executionLineTailMarker = this.codeMirror().markText({ line: lineNumber, ch: columnNumber }, { line: lineNumber, ch: this.codeMirror().getLine(lineNumber).length }, { className: "cm-execution-line-tail" });
+    },
+
+    clearExecutionLine: function()
+    {
+        this.clearPositionHighlight();
+
+        if (this._executionLine)
+            this.codeMirror().removeLineClass(this._executionLine, "wrap", "cm-execution-line");
+        delete this._executionLine;
+
+        if (this._executionLineTailMarker)
+            this._executionLineTailMarker.clear();
+        delete this._executionLineTailMarker;
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {string} className
+     * @param {boolean} toggled
+     */
+    toggleLineClass: function(lineNumber, className, toggled)
+    {
+        if (this.hasLineClass(lineNumber, className) === toggled)
+            return;
+
+        var lineHandle = this.codeMirror().getLineHandle(lineNumber);
+        if (!lineHandle)
+            return;
+
+        if (toggled) {
+            this.codeMirror().addLineClass(lineHandle, "gutter", className);
+            this.codeMirror().addLineClass(lineHandle, "wrap", className);
+        } else {
+            this.codeMirror().removeLineClass(lineHandle, "gutter", className);
+            this.codeMirror().removeLineClass(lineHandle, "wrap", className);
+        }
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {string} className
+     * @return {boolean}
+     */
+    hasLineClass: function(lineNumber, className)
+    {
+        var lineInfo = this.codeMirror().lineInfo(lineNumber);
+        var wrapClass = lineInfo.wrapClass || "";
+        var classNames = wrapClass.split(" ");
+        return classNames.indexOf(className) !== -1;
+    },
+
+    _gutterClick: function(instance, lineNumber, gutter, event)
+    {
+        this.dispatchEventToListeners(WebInspector.SourcesTextEditor.Events.GutterClick, { lineNumber: lineNumber, event: event });
+    },
+
+    _contextMenu: function(event)
+    {
+        var contextMenu = new WebInspector.ContextMenu(event);
+        event.consume(true); // Consume event now to prevent document from handling the async menu
+        var target = event.target.enclosingNodeOrSelfWithClass("CodeMirror-gutter-elt");
+        var promise;
+        if (target) {
+            promise = this._delegate.populateLineGutterContextMenu(contextMenu, parseInt(target.textContent, 10) - 1);
+        } else {
+            var textSelection = this.selection();
+            promise = this._delegate.populateTextAreaContextMenu(contextMenu, textSelection.startLine, textSelection.startColumn);
+        }
+        promise.then(showAsync.bind(this));
+
+        /**
+         * @this {WebInspector.SourcesTextEditor}
+         */
+        function showAsync()
+        {
+            contextMenu.appendApplicableItems(this);
+            contextMenu.show();
+        }
+    },
+
+    /**
+     * @override
+     * @param {!WebInspector.TextRange} range
+     * @param {string} text
+     * @param {string=} origin
+     * @return {!WebInspector.TextRange}
+     */
+    editRange: function(range, text, origin)
+    {
+        var newRange = WebInspector.CodeMirrorTextEditor.prototype.editRange.call(this, range, text, origin);
+        this._delegate.onTextChanged(range, newRange);
+
+        if (WebInspector.moduleSetting("textEditorAutoDetectIndent").get())
+            this._onUpdateEditorIndentation();
+
+        return newRange;
+    },
+
+    _onUpdateEditorIndentation: function()
+    {
+        this._setEditorIndentation(WebInspector.CodeMirrorUtils.pullLines(this.codeMirror(), WebInspector.SourcesTextEditor.LinesToScanForIndentationGuessing));
+    },
+
+    /**
+     * @param {!Array.<string>} lines
+     */
+    _setEditorIndentation: function(lines)
+    {
+        var extraKeys = {};
+        var indent = WebInspector.moduleSetting("textEditorIndent").get();
+        if (WebInspector.moduleSetting("textEditorAutoDetectIndent").get())
+            indent = WebInspector.SourcesTextEditor._guessIndentationLevel(lines);
+
+        if (indent === WebInspector.TextUtils.Indent.TabCharacter) {
+            this.codeMirror().setOption("indentWithTabs", true);
+            this.codeMirror().setOption("indentUnit", 4);
+        } else {
+            this.codeMirror().setOption("indentWithTabs", false);
+            this.codeMirror().setOption("indentUnit", indent.length);
+            extraKeys.Tab = function(codeMirror)
+            {
+                if (codeMirror.somethingSelected())
+                    return CodeMirror.Pass;
+                var pos = codeMirror.getCursor("head");
+                codeMirror.replaceRange(indent.substring(pos.ch % indent.length), codeMirror.getCursor());
+            }
+        }
+
+        this.codeMirror().setOption("extraKeys", extraKeys);
+        this._indentationLevel = indent;
+    },
+
+    /**
+     * @return {string}
+     */
+    _indent: function()
+    {
+        return this._indentationLevel;
+    },
+
+    _onAutoAppendedSpaces: function()
+    {
+        this._autoAppendedSpaces = this._autoAppendedSpaces || [];
+
+        for (var i = 0; i < this._autoAppendedSpaces.length; ++i) {
+            var position = this._autoAppendedSpaces[i].resolve();
+            if (!position)
+                continue;
+            var line = this.line(position.lineNumber);
+            if (line.length === position.columnNumber && WebInspector.TextUtils.lineIndent(line).length === line.length)
+                this.codeMirror().replaceRange("", new CodeMirror.Pos(position.lineNumber, 0), new CodeMirror.Pos(position.lineNumber, position.columnNumber));
+        }
+
+        this._autoAppendedSpaces = [];
+        var selections = this.selections();
+        for (var i = 0; i < selections.length; ++i) {
+            var selection = selections[i];
+            this._autoAppendedSpaces.push(this.textEditorPositionHandle(selection.startLine, selection.startColumn));
+        }
+    },
+
+    /**
+     * @param {!CodeMirror} codeMirror
+     * @param {!Array.<!CodeMirror.ChangeObject>} changes
+     */
+    _changesForDelegate: function(codeMirror, changes)
+    {
+        if (!changes.length || this._muteTextChangedEvent)
+            return;
+        var edits = [];
+        var currentEdit;
+
+        for (var changeIndex = 0; changeIndex < changes.length; ++changeIndex) {
+            var changeObject = changes[changeIndex];
+            var edit = WebInspector.CodeMirrorUtils.changeObjectToEditOperation(changeObject);
+            if (currentEdit && edit.oldRange.equal(currentEdit.newRange)) {
+                currentEdit.newRange = edit.newRange;
+            } else {
+                currentEdit = edit;
+                edits.push(currentEdit);
+            }
+        }
+
+        for (var i = 0; i < edits.length; ++i) {
+            var edit = edits[i];
+            this._delegate.onTextChanged(edit.oldRange, edit.newRange);
+        }
+    },
+
+    _cursorActivity: function()
+    {
+        if (!this._isSearchActive())
+            this.codeMirror().operation(this._tokenHighlighter.highlightSelectedTokens.bind(this._tokenHighlighter));
+
+        var start = this.codeMirror().getCursor("anchor");
+        var end = this.codeMirror().getCursor("head");
+        this._delegate.selectionChanged(WebInspector.CodeMirrorUtils.toRange(start, end));
+    },
+
+    /**
+     * @param {?WebInspector.TextRange} from
+     * @param {?WebInspector.TextRange} to
+     */
+    _reportJump: function(from, to)
+    {
+        if (from && to && from.equal(to))
+            return;
+        this._delegate.onJumpToPosition(from, to);
+    },
+
+    _scroll: function()
+    {
+        var topmostLineNumber = this.codeMirror().lineAtHeight(this.codeMirror().getScrollInfo().top, "local");
+        this._delegate.scrollChanged(topmostLineNumber);
+    },
+
+    _focus: function()
+    {
+        this._delegate.editorFocused();
+    },
+
+    /**
+     * @param {!CodeMirror} codeMirror
+     * @param {{ranges: !Array.<{head: !CodeMirror.Pos, anchor: !CodeMirror.Pos}>}} selection
+     */
+    _beforeSelectionChangeForDelegate: function(codeMirror, selection)
+    {
+        if (!this._isHandlingMouseDownEvent)
+            return;
+        if (!selection.ranges.length)
+            return;
+
+        var primarySelection = selection.ranges[0];
+        this._reportJump(this.selection(), WebInspector.CodeMirrorUtils.toRange(primarySelection.anchor, primarySelection.head));
+    },
+
+    /**
+     * @override
+     */
+    dispose: function()
+    {
+        WebInspector.CodeMirrorTextEditor.prototype.dispose.call(this);
+        WebInspector.moduleSetting("textEditorIndent").removeChangeListener(this._onUpdateEditorIndentation, this);
+        WebInspector.moduleSetting("textEditorAutoDetectIndent").removeChangeListener(this._onUpdateEditorIndentation, this);
+        WebInspector.moduleSetting("showWhitespacesInEditor").removeChangeListener(this._updateWhitespace, this);
+    },
+
+    /**
+     * @override
+     * @param {string} text
+     */
+    setText: function(text)
+    {
+        this._muteTextChangedEvent = true;
+        this._setEditorIndentation(text.split("\n").slice(0, WebInspector.SourcesTextEditor.LinesToScanForIndentationGuessing));
+        WebInspector.CodeMirrorTextEditor.prototype.setText.call(this, text);
+        delete this._muteTextChangedEvent;
+    },
+
+    /**
+     * @override
+     * @param {string} mimeType
+     */
+    setMimeType: function(mimeType)
+    {
+        this._mimeType = mimeType;
+        WebInspector.CodeMirrorTextEditor.prototype.setMimeType.call(this, this._applyWhitespaceMimetype(mimeType));
+    },
+
+    _updateWhitespace: function()
+    {
+        if (this._mimeType)
+            this.setMimeType(this._mimeType);
+    },
+
+    /**
+     * @param {string} mimeType
+     * @return {string}
+     */
+    _applyWhitespaceMimetype: function(mimeType)
+    {
+        this._setupWhitespaceHighlight();
+        var whitespaceMode = WebInspector.moduleSetting("showWhitespacesInEditor").get();
+        this.element.classList.toggle("show-whitespaces", whitespaceMode === "all");
+
+        if (whitespaceMode === "all")
+            return this._allWhitespaceOverlayMode(mimeType);
+        else if (whitespaceMode === "trailing")
+            return this._trailingWhitespaceOverlayMode(mimeType);
+
+        return mimeType;
+    },
+
+    /**
+     * @param {string} mimeType
+     * @return {string}
+     */
+    _allWhitespaceOverlayMode: function(mimeType)
+    {
+        var modeName = CodeMirror.mimeModes[mimeType] ? (CodeMirror.mimeModes[mimeType].name || CodeMirror.mimeModes[mimeType]) : CodeMirror.mimeModes["text/plain"];
+        modeName += "+all-whitespaces";
+        if (CodeMirror.modes[modeName])
+            return modeName;
+
+        function modeConstructor(config, parserConfig)
+        {
+            function nextToken(stream)
+            {
+                if (stream.peek() === " ") {
+                    var spaces = 0;
+                    while (spaces < WebInspector.SourcesTextEditor.MaximumNumberOfWhitespacesPerSingleSpan && stream.peek() === " ") {
+                        ++spaces;
+                        stream.next();
+                    }
+                    return "whitespace whitespace-" + spaces;
+                }
+                while (!stream.eol() && stream.peek() !== " ")
+                    stream.next();
+                return null;
+            }
+            var whitespaceMode = {
+                token: nextToken
+            };
+            return CodeMirror.overlayMode(CodeMirror.getMode(config, mimeType), whitespaceMode, false);
+        }
+        CodeMirror.defineMode(modeName, modeConstructor);
+        return modeName;
+    },
+
+    /**
+     * @param {string} mimeType
+     * @return {string}
+     */
+    _trailingWhitespaceOverlayMode: function(mimeType)
+    {
+        var modeName = CodeMirror.mimeModes[mimeType] ? (CodeMirror.mimeModes[mimeType].name || CodeMirror.mimeModes[mimeType]) : CodeMirror.mimeModes["text/plain"];
+        modeName += "+trailing-whitespaces";
+        if (CodeMirror.modes[modeName])
+            return modeName;
+
+        function modeConstructor(config, parserConfig)
+        {
+            function nextToken(stream)
+            {
+                var pos = stream.pos;
+                if (stream.match(/^\s+$/, true))
+                    return true ? "trailing-whitespace" : null;
+                do {
+                    stream.next();
+                } while (!stream.eol() && stream.peek() !== " ");
+                return null;
+            }
+            var whitespaceMode = {
+                token: nextToken
+            };
+            return CodeMirror.overlayMode(CodeMirror.getMode(config, mimeType), whitespaceMode, false);
+        }
+        CodeMirror.defineMode(modeName, modeConstructor);
+        return modeName;
+    },
+
+    _setupWhitespaceHighlight: function()
+    {
+        var doc = this.element.ownerDocument;
+        if (doc._codeMirrorWhitespaceStyleInjected || !WebInspector.moduleSetting("showWhitespacesInEditor").get())
+            return;
+        doc._codeMirrorWhitespaceStyleInjected = true;
+        const classBase = ".show-whitespaces .CodeMirror .cm-whitespace-";
+        const spaceChar = "·";
+        var spaceChars = "";
+        var rules = "";
+        for (var i = 1; i <= WebInspector.SourcesTextEditor.MaximumNumberOfWhitespacesPerSingleSpan; ++i) {
+            spaceChars += spaceChar;
+            var rule = classBase + i + "::before { content: '" + spaceChars + "';}\n";
+            rules += rule;
+        }
+        var style = doc.createElement("style");
+        style.textContent = rules;
+        doc.head.appendChild(style);
+    },
+
+    __proto__: WebInspector.CodeMirrorTextEditor.prototype
+}
+
+/** @typedef {{lineNumber: number, event: !Event}} */
+WebInspector.SourcesTextEditor.GutterClickEventData;
+
+/** @enum {string} */
+WebInspector.SourcesTextEditor.Events = {
+    GutterClick: "GutterClick"
+}
+/**
+ * @interface
+ */
+WebInspector.SourcesTextEditorDelegate = function() { }
+WebInspector.SourcesTextEditorDelegate.prototype = {
+
+    /**
+     * @param {!WebInspector.TextRange} oldRange
+     * @param {!WebInspector.TextRange} newRange
+     */
+    onTextChanged: function(oldRange, newRange) { },
+
+    /**
+     * @param {!WebInspector.TextRange} textRange
+     */
+    selectionChanged: function(textRange) { },
+
+    /**
+     * @param {number} lineNumber
+     */
+    scrollChanged: function(lineNumber) { },
+
+    editorFocused: function() { },
+
+    /**
+     * @param {!WebInspector.ContextMenu} contextMenu
+     * @param {number} lineNumber
+     * @return {!Promise}
+     */
+    populateLineGutterContextMenu: function(contextMenu, lineNumber) { },
+
+    /**
+     * @param {!WebInspector.ContextMenu} contextMenu
+     * @param {number} lineNumber
+     * @param {number} columnNumber
+     * @return {!Promise}
+     */
+    populateTextAreaContextMenu: function(contextMenu, lineNumber, columnNumber) { },
+
+    /**
+     * @param {?WebInspector.TextRange} from
+     * @param {?WebInspector.TextRange} to
+     */
+    onJumpToPosition: function(from, to) { }
+}
+
+/**
+ * @param {!CodeMirror} codeMirror
+ */
+CodeMirror.commands.smartNewlineAndIndent = function(codeMirror)
+{
+    codeMirror.operation(innerSmartNewlineAndIndent.bind(null, codeMirror));
+    function innerSmartNewlineAndIndent(codeMirror)
+    {
+        var selections = codeMirror.listSelections();
+        var replacements = [];
+        for (var i = 0; i < selections.length; ++i) {
+            var selection = selections[i];
+            var cur = CodeMirror.cmpPos(selection.head, selection.anchor) < 0 ? selection.head : selection.anchor;
+            var line = codeMirror.getLine(cur.line);
+            var indent = WebInspector.TextUtils.lineIndent(line);
+            replacements.push("\n" + indent.substring(0, Math.min(cur.ch, indent.length)));
+        }
+        codeMirror.replaceSelections(replacements);
+        codeMirror._codeMirrorTextEditor._onAutoAppendedSpaces();
+    }
+}
+
+/**
+ * @return {!Object|undefined}
+ */
+CodeMirror.commands.sourcesDismiss = function(codemirror)
+{
+    if (codemirror.listSelections().length === 1 && codemirror._codeMirrorTextEditor._isSearchActive())
+        return CodeMirror.Pass;
+    return CodeMirror.commands.dismiss(codemirror);
+}
+
+/**
+ * @constructor
+ * @param {!CodeMirror} codeMirror
+ */
+WebInspector.SourcesTextEditor.BlockIndentController = function(codeMirror)
+{
+    codeMirror.addKeyMap(this);
+}
+
+WebInspector.SourcesTextEditor.BlockIndentController.prototype = {
+    name: "blockIndentKeymap",
+
+    /**
+     * @return {*}
+     */
+    Enter: function(codeMirror)
+    {
+        var selections = codeMirror.listSelections();
+        var replacements = [];
+        var allSelectionsAreCollapsedBlocks = false;
+        for (var i = 0; i < selections.length; ++i) {
+            var selection = selections[i];
+            var start = CodeMirror.cmpPos(selection.head, selection.anchor) < 0 ? selection.head : selection.anchor;
+            var line = codeMirror.getLine(start.line);
+            var indent = WebInspector.TextUtils.lineIndent(line);
+            var indentToInsert = "\n" + indent + codeMirror._codeMirrorTextEditor._indent();
+            var isCollapsedBlock = false;
+            if (selection.head.ch === 0)
+                return CodeMirror.Pass;
+            if (line.substr(selection.head.ch - 1, 2) === "{}") {
+                indentToInsert += "\n" + indent;
+                isCollapsedBlock = true;
+            } else if (line.substr(selection.head.ch - 1, 1) !== "{") {
+                return CodeMirror.Pass;
+            }
+            if (i > 0 && allSelectionsAreCollapsedBlocks !== isCollapsedBlock)
+                return CodeMirror.Pass;
+            replacements.push(indentToInsert);
+            allSelectionsAreCollapsedBlocks = isCollapsedBlock;
+        }
+        codeMirror.replaceSelections(replacements);
+        if (!allSelectionsAreCollapsedBlocks) {
+            codeMirror._codeMirrorTextEditor._onAutoAppendedSpaces();
+            return;
+        }
+        selections = codeMirror.listSelections();
+        var updatedSelections = [];
+        for (var i = 0; i < selections.length; ++i) {
+            var selection = selections[i];
+            var line = codeMirror.getLine(selection.head.line - 1);
+            var position = new CodeMirror.Pos(selection.head.line - 1, line.length);
+            updatedSelections.push({
+                head: position,
+                anchor: position
+            });
+        }
+        codeMirror.setSelections(updatedSelections);
+        codeMirror._codeMirrorTextEditor._onAutoAppendedSpaces();
+    },
+
+    /**
+     * @return {*}
+     */
+    "'}'": function(codeMirror)
+    {
+        if (codeMirror.somethingSelected())
+            return CodeMirror.Pass;
+        var selections = codeMirror.listSelections();
+        var replacements = [];
+        for (var i = 0; i < selections.length; ++i) {
+            var selection = selections[i];
+            var line = codeMirror.getLine(selection.head.line);
+            if (line !== WebInspector.TextUtils.lineIndent(line))
+                return CodeMirror.Pass;
+            replacements.push("}");
+        }
+        codeMirror.replaceSelections(replacements);
+        selections = codeMirror.listSelections();
+        replacements = [];
+        var updatedSelections = [];
+        for (var i = 0; i < selections.length; ++i) {
+            var selection = selections[i];
+            var matchingBracket = codeMirror.findMatchingBracket(selection.head);
+            if (!matchingBracket || !matchingBracket.match)
+                return;
+            updatedSelections.push({
+                head: selection.head,
+                anchor: new CodeMirror.Pos(selection.head.line, 0)
+            });
+            var line = codeMirror.getLine(matchingBracket.to.line);
+            var indent = WebInspector.TextUtils.lineIndent(line);
+            replacements.push(indent + "}");
+        }
+        codeMirror.setSelections(updatedSelections);
+        codeMirror.replaceSelections(replacements);
+    }
+}
+
+/**
+ * @param {!Array.<string>} lines
+ * @return {string}
+ */
+WebInspector.SourcesTextEditor._guessIndentationLevel = function(lines)
+{
+    var tabRegex = /^\t+/;
+    var tabLines = 0;
+    var indents = {};
+    for (var lineNumber = 0; lineNumber < lines.length; ++lineNumber) {
+        var text = lines[lineNumber];
+        if (text.length === 0 || !WebInspector.TextUtils.isSpaceChar(text[0]))
+            continue;
+        if (tabRegex.test(text)) {
+            ++tabLines;
+            continue;
+        }
+        var i = 0;
+        while (i < text.length && WebInspector.TextUtils.isSpaceChar(text[i]))
+            ++i;
+        if (i % 2 !== 0)
+            continue;
+        indents[i] = 1 + (indents[i] || 0);
+    }
+    var linesCountPerIndentThreshold = 3 * lines.length / 100;
+    if (tabLines && tabLines > linesCountPerIndentThreshold)
+        return "\t";
+    var minimumIndent = Infinity;
+    for (var i in indents) {
+        if (indents[i] < linesCountPerIndentThreshold)
+            continue;
+        var indent = parseInt(i, 10);
+        if (minimumIndent > indent)
+            minimumIndent = indent;
+    }
+    if (minimumIndent === Infinity)
+        return WebInspector.moduleSetting("textEditorIndent").get();
+    return " ".repeat(minimumIndent);
+}
+
+/**
+ * @constructor
+ * @param {!WebInspector.SourcesTextEditor} textEditor
+ * @param {!CodeMirror} codeMirror
+ */
+WebInspector.SourcesTextEditor.TokenHighlighter = function(textEditor, codeMirror)
+{
+    this._textEditor = textEditor;
+    this._codeMirror = codeMirror;
+}
+
+WebInspector.SourcesTextEditor.TokenHighlighter.prototype = {
+    /**
+     * @param {!RegExp} regex
+     * @param {?WebInspector.TextRange} range
+     */
+    highlightSearchResults: function(regex, range)
+    {
+        var oldRegex = this._highlightRegex;
+        this._highlightRegex = regex;
+        this._highlightRange = range;
+        if (this._searchResultMarker) {
+            this._searchResultMarker.clear();
+            delete this._searchResultMarker;
+        }
+        if (this._highlightDescriptor && this._highlightDescriptor.selectionStart)
+            this._codeMirror.removeLineClass(this._highlightDescriptor.selectionStart.line, "wrap", "cm-line-with-selection");
+        var selectionStart = this._highlightRange ? new CodeMirror.Pos(this._highlightRange.startLine, this._highlightRange.startColumn) : null;
+        if (selectionStart)
+            this._codeMirror.addLineClass(selectionStart.line, "wrap", "cm-line-with-selection");
+        if (this._highlightRegex === oldRegex) {
+            // Do not re-add overlay mode if regex did not change for better performance.
+            if (this._highlightDescriptor)
+                this._highlightDescriptor.selectionStart = selectionStart;
+        } else {
+            this._removeHighlight();
+            this._setHighlighter(this._searchHighlighter.bind(this, this._highlightRegex), selectionStart);
+        }
+        if (this._highlightRange) {
+            var pos = WebInspector.CodeMirrorUtils.toPos(this._highlightRange);
+            this._searchResultMarker = this._codeMirror.markText(pos.start, pos.end, {className: "cm-column-with-selection"});
+        }
+    },
+
+    /**
+     * @return {!RegExp|undefined}
+     */
+    highlightedRegex: function()
+    {
+        return this._highlightRegex;
+    },
+
+    highlightSelectedTokens: function()
+    {
+        delete this._highlightRegex;
+        delete this._highlightRange;
+        if (this._highlightDescriptor && this._highlightDescriptor.selectionStart)
+            this._codeMirror.removeLineClass(this._highlightDescriptor.selectionStart.line, "wrap", "cm-line-with-selection");
+        this._removeHighlight();
+        var selectionStart = this._codeMirror.getCursor("start");
+        var selectionEnd = this._codeMirror.getCursor("end");
+        if (selectionStart.line !== selectionEnd.line)
+            return;
+        if (selectionStart.ch === selectionEnd.ch)
+            return;
+        var selections = this._codeMirror.getSelections();
+        if (selections.length > 1)
+            return;
+        var selectedText = selections[0];
+        if (this._isWord(selectedText, selectionStart.line, selectionStart.ch, selectionEnd.ch)) {
+            if (selectionStart)
+                this._codeMirror.addLineClass(selectionStart.line, "wrap", "cm-line-with-selection");
+            this._setHighlighter(this._tokenHighlighter.bind(this, selectedText, selectionStart), selectionStart);
+        }
+    },
+
+    /**
+     * @param {string} selectedText
+     * @param {number} lineNumber
+     * @param {number} startColumn
+     * @param {number} endColumn
+     */
+    _isWord: function(selectedText, lineNumber, startColumn, endColumn)
+    {
+        var line = this._codeMirror.getLine(lineNumber);
+        var leftBound = startColumn === 0 || !WebInspector.TextUtils.isWordChar(line.charAt(startColumn - 1));
+        var rightBound = endColumn === line.length || !WebInspector.TextUtils.isWordChar(line.charAt(endColumn));
+        return leftBound && rightBound && WebInspector.TextUtils.isWord(selectedText);
+    },
+
+    _removeHighlight: function()
+    {
+        if (this._highlightDescriptor) {
+            this._codeMirror.removeOverlay(this._highlightDescriptor.overlay);
+            delete this._highlightDescriptor;
+        }
+    },
+
+    /**
+     * @param {!RegExp} regex
+     * @param {!CodeMirror.StringStream} stream
+     */
+    _searchHighlighter: function(regex, stream)
+    {
+        if (stream.column() === 0)
+            delete this._searchMatchLength;
+        if (this._searchMatchLength) {
+            if (this._searchMatchLength > 2) {
+                for (var i = 0; i < this._searchMatchLength - 2; ++i)
+                    stream.next();
+                this._searchMatchLength = 1;
+                return "search-highlight";
+            } else {
+                stream.next();
+                delete this._searchMatchLength;
+                return "search-highlight search-highlight-end";
+            }
+        }
+        var match = stream.match(regex, false);
+        if (match) {
+            stream.next();
+            var matchLength = match[0].length;
+            if (matchLength === 1)
+                return "search-highlight search-highlight-full";
+            this._searchMatchLength = matchLength;
+            return "search-highlight search-highlight-start";
+        }
+        while (!stream.match(regex, false) && stream.next()) {}
+    },
+
+    /**
+     * @param {string} token
+     * @param {!CodeMirror.Pos} selectionStart
+     * @param {!CodeMirror.StringStream} stream
+     */
+    _tokenHighlighter: function(token, selectionStart, stream)
+    {
+        var tokenFirstChar = token.charAt(0);
+        if (stream.match(token) && (stream.eol() || !WebInspector.TextUtils.isWordChar(stream.peek())))
+            return stream.column() === selectionStart.ch ? "token-highlight column-with-selection" : "token-highlight";
+        var eatenChar;
+        do {
+            eatenChar = stream.next();
+        } while (eatenChar && (WebInspector.TextUtils.isWordChar(eatenChar) || stream.peek() !== tokenFirstChar));
+    },
+
+    /**
+     * @param {function(!CodeMirror.StringStream)} highlighter
+     * @param {?CodeMirror.Pos} selectionStart
+     */
+    _setHighlighter: function(highlighter, selectionStart)
+    {
+        var overlayMode = {
+            token: highlighter
+        };
+        this._codeMirror.addOverlay(overlayMode);
+        this._highlightDescriptor = {
+            overlay: overlayMode,
+            selectionStart: selectionStart
+        };
+    }
+}
+
+WebInspector.SourcesTextEditor.LinesToScanForIndentationGuessing = 1000;
+WebInspector.SourcesTextEditor.MaximumNumberOfWhitespacesPerSingleSpan = 16;