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diff --git a/Source/WebInspectorUI/UserInterface/Views/VisualStyleCommaSeparatedKeywordEditor.js b/Source/WebInspectorUI/UserInterface/Views/VisualStyleCommaSeparatedKeywordEditor.js
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+++ b/Source/WebInspectorUI/UserInterface/Views/VisualStyleCommaSeparatedKeywordEditor.js
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+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.VisualStyleCommaSeparatedKeywordEditor = class VisualStyleCommaSeparatedKeywordEditor extends WebInspector.VisualStylePropertyEditor
+{
+    constructor(propertyNames, text, longhandProperties, insertNewItemsBeforeSelected, layoutReversed)
+    {
+        super(propertyNames, text, null, null, "comma-separated-keyword-editor", layoutReversed);
+
+        this._insertNewItemsBeforeSelected = insertNewItemsBeforeSelected || false;
+        this._longhandProperties = longhandProperties || {};
+
+        let listElement = document.createElement("ol");
+        listElement.classList.add("visual-style-comma-separated-keyword-list");
+        listElement.addEventListener("keydown", this._listElementKeyDown.bind(this));
+        this.contentElement.appendChild(listElement);
+
+        this._commaSeparatedKeywords = new WebInspector.TreeOutline(listElement);
+        this._commaSeparatedKeywords.addEventListener(WebInspector.TreeOutline.Event.SelectionDidChange, this._treeSelectionDidChange, this);
+
+        let controlContainer = document.createElement("div");
+        controlContainer.classList.add("visual-style-comma-separated-keyword-controls");
+        this.contentElement.appendChild(controlContainer);
+
+        let addGlyphElement = useSVGSymbol("Images/Plus13.svg", "visual-style-add-comma-separated-keyword");
+        addGlyphElement.addEventListener("click", this._addEmptyCommaSeparatedKeyword.bind(this));
+        controlContainer.appendChild(addGlyphElement);
+
+        let removeGlyphElement = useSVGSymbol("Images/Minus.svg", "visual-style-remove-comma-separated-keyword", WebInspector.UIString("Remove selected item"));
+        removeGlyphElement.addEventListener("click", this._removeSelectedCommaSeparatedKeyword.bind(this));
+        controlContainer.appendChild(removeGlyphElement);
+    }
+
+    // Public
+
+    set selectedTreeElementValue(text)
+    {
+        let selectedTreeElement = this._commaSeparatedKeywords.selectedTreeElement;
+        if (!selectedTreeElement)
+            return;
+
+        selectedTreeElement.element.classList.toggle("no-value", !text || !text.length);
+        selectedTreeElement.mainTitle = text;
+        this._valueDidChange();
+    }
+
+    get value()
+    {
+        if (!this._commaSeparatedKeywords.hasChildren)
+            return "";
+
+        let value = "";
+        for (let treeItem of this._commaSeparatedKeywords.children) {
+            if (this._treeElementIsEmpty(treeItem))
+                continue;
+
+            if (value.length)
+                value += ", ";
+
+            let text = treeItem.mainTitle;
+            if (typeof this._modifyCommaSeparatedKeyword === "function")
+                text = this._modifyCommaSeparatedKeyword(text);
+
+            value += text;
+        }
+
+        return value;
+    }
+
+    set value(commaSeparatedValue)
+    {
+        if (commaSeparatedValue && commaSeparatedValue === this.value)
+            return;
+
+        this._commaSeparatedKeywords.removeChildren();
+        if (!commaSeparatedValue || !commaSeparatedValue.length) {
+            this.dispatchEventToListeners(WebInspector.VisualStyleCommaSeparatedKeywordEditor.Event.NoRemainingTreeItems);
+            return;
+        }
+
+        // It is necessary to add the beginning \) to ensure inner parenthesis are not matched.
+        let values = commaSeparatedValue.split(/\)\s*,\s*(?![^\(\)]*\))/);
+        for (let i = 0; i < values.length; ++i) {
+            if (!values[i].includes(","))
+                continue;
+
+            let openParentheses = values[i].getMatchingIndexes("(").length;
+            let closedParenthesis = values[i].getMatchingIndexes(")").length;
+            values[i] += (openParentheses - closedParenthesis === 1) ? ")" : "";
+        }
+
+        // Allow splitting with parenthesis if the parenthesis does not have any commas.
+        let hasParenthesis = values[0] && (values[0].includes("(") || values[0].includes(")"));
+        if (values.length === 1 && (!hasParenthesis || !/\([^\)]*,[^\)]*\)/.test(values[0])))
+            values = values[0].split(/\s*,\s*/);
+
+        for (let value of values)
+            this._addCommaSeparatedKeyword(value);
+
+        this._commaSeparatedKeywords.children[0].select(true);
+    }
+
+    get synthesizedValue()
+    {
+        return this.value || null;
+    }
+
+    recalculateWidth(value)
+    {
+        if (this._titleElement) {
+            // 55px width and 4px margin on left and right for title element,
+            // plus the 11px margin right on the content element
+            value -= 74;
+        } else {
+            // 11px margin on left and right of the content element
+            value -= 22;
+        }
+
+        this.contentElement.style.width = Math.max(value, 0) + "px";
+    }
+
+    // Private
+
+    _generateTextFromLonghandProperties()
+    {
+        let text = "";
+        if (!this._style)
+            return text;
+
+        function propertyValue(existingProperty, propertyName) {
+            if (existingProperty)
+                return existingProperty.value;
+
+            if (propertyName)
+                return this._longhandProperties[propertyName];
+
+            return "";
+        }
+
+        let onePropertyExists = false;
+        let valueLists = [];
+        let valuesCount = 0;
+        for (let propertyName in this._longhandProperties) {
+            let existingProperty = this._style.propertyForName(propertyName, true);
+            if (existingProperty)
+                onePropertyExists = true;
+
+            let matches = propertyValue.call(this, existingProperty, propertyName).split(/\s*,\s*(?![^\(]*\))/);
+            valuesCount = Math.max(valuesCount, matches.length);
+            valueLists.push(matches);
+        }
+
+        if (!onePropertyExists)
+            return text;
+
+        let count = 0;
+        while (count < valuesCount) {
+            if (count > 0)
+                text += ", ";
+
+            for (let valueList of valueLists)
+                text += valueList[count > valueList.length - 1 ? valueList.length - 1 : count] + " ";
+
+            ++count;
+        }
+        return text;
+    }
+
+    modifyPropertyText(text, value)
+    {
+        for (let property in this._longhandProperties) {
+            let replacementRegExp = new RegExp(property + "\s*:\s*[^;]*(;|$)");
+            text = text.replace(replacementRegExp, "");
+        }
+        return super.modifyPropertyText(text, value);
+    }
+
+    _listElementKeyDown(event)
+    {
+        let selectedTreeElement = this._commaSeparatedKeywords.selectedTreeElement;
+        if (!selectedTreeElement)
+            return;
+
+        if (selectedTreeElement.currentlyEditing)
+            return;
+
+        let keyCode = event.keyCode;
+        let backspaceKeyCode = WebInspector.KeyboardShortcut.Key.Backspace.keyCode;
+        let deleteKeyCode = WebInspector.KeyboardShortcut.Key.Delete.keyCode;
+        if (keyCode === backspaceKeyCode || keyCode === deleteKeyCode)
+            this._removeSelectedCommaSeparatedKeyword();
+    }
+
+    _treeSelectionDidChange(event)
+    {
+        let treeElement = event.data.selectedElement;
+        if (!treeElement)
+            return;
+
+        this._removeEmptyCommaSeparatedKeywords();
+        this.dispatchEventToListeners(WebInspector.VisualStyleCommaSeparatedKeywordEditor.Event.TreeItemSelected, {text: treeElement.mainTitle});
+    }
+
+    _treeElementIsEmpty(item)
+    {
+        return !item._mainTitle || !item._mainTitle.length;
+    }
+
+    _addEmptyCommaSeparatedKeyword()
+    {
+        let newTreeElement = this._addCommaSeparatedKeyword(null, this._commaSeparatedKeywords.selectedTreeElementIndex);
+        newTreeElement.subtitle = WebInspector.UIString("(modify the boxes below to add a value)");
+        newTreeElement.element.classList.add("no-value");
+        newTreeElement.select(true, true);
+        return newTreeElement;
+    }
+
+    _removeSelectedCommaSeparatedKeyword()
+    {
+        let selectedTreeElement = this._commaSeparatedKeywords.selectedTreeElement;
+        this._removeCommaSeparatedKeyword(selectedTreeElement);
+    }
+
+    _removeEmptyCommaSeparatedKeywords()
+    {
+        for (let treeElement of this._commaSeparatedKeywords.children) {
+            if (!this._treeElementIsEmpty(treeElement) || treeElement.selected)
+                continue;
+
+            treeElement.deselect();
+            this._removeCommaSeparatedKeyword(treeElement);
+        }
+    }
+
+    _addCommaSeparatedKeyword(value, index)
+    {
+        let valueElement = this._createNewTreeElement(value);
+        if (!isNaN(index))
+            this._commaSeparatedKeywords.insertChild(valueElement, index + !this._insertNewItemsBeforeSelected);
+        else
+            this._commaSeparatedKeywords.appendChild(valueElement);
+
+        return valueElement;
+    }
+
+    _removeCommaSeparatedKeyword(treeElement)
+    {
+        if (!treeElement)
+            return;
+
+        this._commaSeparatedKeywords.removeChild(treeElement);
+        if (!this._commaSeparatedKeywords.children.length)
+            this.dispatchEventToListeners(WebInspector.VisualStyleCommaSeparatedKeywordEditor.Event.NoRemainingTreeItems);
+
+        this._valueDidChange();
+    }
+
+    _createNewTreeElement(value)
+    {
+        return new WebInspector.GeneralTreeElement(WebInspector.VisualStyleCommaSeparatedKeywordEditor.ListItemClassName, value);
+    }
+};
+
+WebInspector.VisualStyleCommaSeparatedKeywordEditor.ListItemClassName = "visual-style-comma-separated-keyword-item";
+
+WebInspector.VisualStyleCommaSeparatedKeywordEditor.Event = {
+    TreeItemSelected: "visual-style-comma-separated-keyword-editor-tree-item-selected",
+    NoRemainingTreeItems: "visual-style-comma-separated-keyword-editor-no-remaining-tree-items"
+};