DevTools: Decouple CSS model from UI entities

Source/devtools/front_end/sdk/CSSWorkspaceBinding.js

 // Copyright 2014 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
+ * @implements {WebInspector.TargetManager.Observer}
  */
 WebInspector.CSSWorkspaceBinding = function()
 {
+    /** @type {!Map.<!WebInspector.Target, !WebInspector.CSSWorkspaceBinding.TargetInfo>} */
+    this._targetToTargetInfo = new Map();
+    WebInspector.targetManager.observeTargets(this);
+
+    WebInspector.targetManager.addModelListener(WebInspector.ResourceTreeModel, WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._mainFrameCreatedOrNavigated, this);
 }
 
 WebInspector.CSSWorkspaceBinding.prototype = {
     /**
+     * @param {!WebInspector.Target} target
+     */
+    targetAdded: function(target)
+    {
+        this._targetToTargetInfo.put(target, new WebInspector.CSSWorkspaceBinding.TargetInfo(target, WebInspector.workspace, WebInspector.networkWorkspaceBinding));
+    },
+
+    /**
+     * @param {!WebInspector.Target} target
+     */
+    targetRemoved: function(target)
+    {
+        this._targetToTargetInfo.remove(target)._dispose();
+    },
+
+    /**
+     * @param {!WebInspector.CSSStyleSheetHeader} header
+     * @param {!WebInspector.SourceMapping} mapping
+     */
+    pushSourceMapping: function(header, mapping)
+    {
+        this._ensureInfoForHeader(header)._pushSourceMapping(mapping);
+    },
+
+    /**
+     * @param {!WebInspector.CSSStyleSheetHeader} header
+     * @return {?WebInspector.CSSWorkspaceBinding.HeaderInfo}
+     */
+    _headerInfo: function(header)
+    {
+        var map = this._targetToTargetInfo.get(header.target());
+        return map._headerInfo(header.id) || null;
+    },
+
+    /**
+     * @param {!WebInspector.CSSStyleSheetHeader} header
+     * @return {!WebInspector.CSSWorkspaceBinding.HeaderInfo}
+     */
+    _ensureInfoForHeader: function(header)
+    {
+        var targetInfo = this._targetToTargetInfo.get(header.target());
+        if (!targetInfo) {
+            targetInfo = new WebInspector.CSSWorkspaceBinding.TargetInfo(header.target(), WebInspector.workspace, WebInspector.networkWorkspaceBinding);
+            this._targetToTargetInfo.put(header.target(), targetInfo);
+        }
+        return targetInfo._ensureInfoForHeader(header);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _mainFrameCreatedOrNavigated: function(event)
+    {
+        var target = /** @type {!WebInspector.ResourceTreeModel} */ (event.target).target();
+        var info = this._targetToTargetInfo.remove(target);
+        if (info)
+            info._dispose();
+        this._targetToTargetInfo.put(target, new WebInspector.CSSWorkspaceBinding.TargetInfo(target, WebInspector.workspace, WebInspector.networkWorkspaceBinding));
+    },
+
+    /**
+     * @param {!WebInspector.CSSStyleSheetHeader} header
+     */
+    updateLocations: function(header)
+    {
+        var info = this._headerInfo(header);
+        if (info)
+            info._updateLocations();
+    },
+
+    /**
      * @param {!WebInspector.CSSLocation} rawLocation
      * @param {function(!WebInspector.UILocation):(boolean|undefined)} updateDelegate
-     * @return {!WebInspector.CSSStyleModel.LiveLocation}
+     * @return {!WebInspector.CSSWorkspaceBinding.LiveLocation}
      */
     createLiveLocation: function(rawLocation, updateDelegate)
     {
-        return /** @type {!WebInspector.CSSStyleModel.LiveLocation} */ (rawLocation.createLiveLocation(updateDelegate));
+        var header = rawLocation.styleSheetId ? rawLocation.target().cssModel.styleSheetHeaderForId(rawLocation.styleSheetId) : null;
+        return new WebInspector.CSSWorkspaceBinding.LiveLocation(rawLocation.target().cssModel, header, rawLocation, updateDelegate);
     },
 
     /**
+     * @param {!WebInspector.CSSWorkspaceBinding.LiveLocation} location
+     */
+    _addLiveLocation: function(location)
+    {
+        this._ensureInfoForHeader(location._header)._addLocation(location);
+    },
+
+    /**
+     * @param {!WebInspector.CSSWorkspaceBinding.LiveLocation} location
+     */
+    _removeLiveLocation: function(location)
+    {
+        var info = this._headerInfo(location._header);
+        if (info)
+            info._removeLocation(location);
+    },
+
+    /**
      * @param {!WebInspector.CSSProperty} cssProperty
      * @param {boolean} forName
      * @return {?WebInspector.UILocation}
      */
     propertyUILocation: function(cssProperty, forName)
     {
         var style = cssProperty.ownerStyle;
         if (!style || !style.parentRule || !style.styleSheetId)
             return null;
 
@@ skipping 11 matching lines @@
         var rawLocation = new WebInspector.CSSLocation(style.target(), style.styleSheetId, url, line, column);
         return this.rawLocationToUILocation(rawLocation);
     },
 
     /**
      * @param {?WebInspector.CSSLocation} rawLocation
      * @return {?WebInspector.UILocation}
      */
     rawLocationToUILocation: function(rawLocation)
     {
-        return rawLocation ? rawLocation.target().cssModel.rawLocationToUILocation(rawLocation) : null;
+        if (!rawLocation)
+            return null;
+        var cssModel = rawLocation.target().cssModel;
+        var frameIdToSheetIds = cssModel.styleSheetIdsByFrameIdForURL(rawLocation.url);
+        if (!Object.values(frameIdToSheetIds).length)
+            return null;
+        var styleSheetIds = [];
+        for (var frameId in frameIdToSheetIds)
+            styleSheetIds = styleSheetIds.concat(frameIdToSheetIds[frameId]);
+        var uiLocation;
+        for (var i = 0; !uiLocation && i < styleSheetIds.length; ++i) {
+            var header = cssModel.styleSheetHeaderForId(styleSheetIds[i]);
+            if (!header)
+                continue;
+            var info = this._headerInfo(header);
+            if (info)
+                uiLocation = info._rawLocationToUILocation(rawLocation.lineNumber, rawLocation.columnNumber);
+        }
+        return uiLocation || null;
     }
 }
 
 /**
+ * @constructor
+ * @param {!WebInspector.Target} target
+ * @param {!WebInspector.Workspace} workspace
+ * @param {!WebInspector.NetworkWorkspaceBinding} networkWorkspaceBinding
+ */
+WebInspector.CSSWorkspaceBinding.TargetInfo = function(target, workspace, networkWorkspaceBinding)
+{
+    this._target = target;
+    this._workspace = workspace;
+
+    var cssModel = target.cssModel;
+    this._stylesSourceMapping = new WebInspector.StylesSourceMapping(cssModel, workspace);
+    this._sassSourceMapping = new WebInspector.SASSSourceMapping(cssModel, workspace, networkWorkspaceBinding);
+
+    /** @type {!StringMap.<!WebInspector.CSSWorkspaceBinding.HeaderInfo>} */
+    this._headerInfoById = new StringMap();
+
+    cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetAdded, this);
+    cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this);
+}
+
+WebInspector.CSSWorkspaceBinding.TargetInfo.prototype = {
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetAdded: function(event)
+    {
+        var header = /** @type {!WebInspector.CSSStyleSheetHeader} */ (event.data);
+        this._stylesSourceMapping.addHeader(header);
+        this._sassSourceMapping.addHeader(header);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetRemoved: function(event)
+    {
+        var header = /** @type {!WebInspector.CSSStyleSheetHeader} */ (event.data);
+        this._stylesSourceMapping.removeHeader(header);
+        this._sassSourceMapping.removeHeader(header);
+        this._headerInfoById.remove(header.id);
+    },
+
+    /**
+     * @param {!CSSAgent.StyleSheetId} id
+     */
+    _headerInfo: function(id)
+    {
+        return this._headerInfoById.get(id);
+    },
+
+    _ensureInfoForHeader: function(header)
+    {
+        var info = this._headerInfoById.get(header.id);
+        if (!info) {
+            info = new WebInspector.CSSWorkspaceBinding.HeaderInfo(header);
+            this._headerInfoById.put(header.id, info);
+        }
+        return info;
+    },
+
+    _dispose: function()
+    {
+        this._target.cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetAdded, this);
+        this._target.cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this);
+    }
+}
+
+/**
+ * @constructor
+ * @param {!WebInspector.CSSStyleSheetHeader} header
+ */
+WebInspector.CSSWorkspaceBinding.HeaderInfo = function(header)
+{
+    this._header = header;
+
+    /** @type {!Array.<!WebInspector.SourceMapping>} */
+    this._sourceMappings = [];
+
+    /** @type {!Set.<!WebInspector.LiveLocation>} */
+    this._locations = new Set();
+}
+
+WebInspector.CSSWorkspaceBinding.HeaderInfo.prototype = {
+    /**
+     * @param {!WebInspector.LiveLocation} location
+     */
+    _addLocation: function(location)
+    {
+        this._locations.add(location);
+        location.update();
+    },
+
+    /**
+     * @param {!WebInspector.LiveLocation} location
+     */
+    _removeLocation: function(location)
+    {
+        this._locations.remove(location);
+    },
+
+    _updateLocations: function()
+    {
+        var items = this._locations.values();
+        for (var i = 0; i < items.length; ++i)
+            items[i].update();
+    },
+
+    /**
+     * @param {number} lineNumber
+     * @param {number=} columnNumber
+     * @return {?WebInspector.UILocation}
+     */
+    _rawLocationToUILocation: function(lineNumber, columnNumber)
+    {
+        var uiLocation = null;
+        var rawLocation = new WebInspector.CSSLocation(this._header.target(), this._header.id, this._header.resourceURL(), lineNumber, columnNumber);
+        for (var i = this._sourceMappings.length - 1; !uiLocation && i >= 0; --i)
+            uiLocation = this._sourceMappings[i].rawLocationToUILocation(rawLocation);
+        return uiLocation;
+    },
+
+    /**
+     * @param {!WebInspector.SourceMapping} sourceMapping
+     */
+    _pushSourceMapping: function(sourceMapping)
+    {
+        this._sourceMappings.push(sourceMapping);
+        this._updateLocations();
+    }
+}
+
+/**
+ * @constructor
+ * @extends {WebInspector.LiveLocation}
+ * @param {!WebInspector.CSSStyleModel} cssModel
+ * @param {?WebInspector.CSSStyleSheetHeader} header
+ * @param {!WebInspector.CSSLocation} rawLocation
+ * @param {function(!WebInspector.UILocation):(boolean|undefined)} updateDelegate
+ */
+WebInspector.CSSWorkspaceBinding.LiveLocation = function(cssModel, header, rawLocation, updateDelegate)
+{
+    WebInspector.LiveLocation.call(this, rawLocation, updateDelegate);
+    this._cssModel = cssModel;
+    if (!header)
+        this._clearStyleSheet();
+    else
+        this._setStyleSheet(header);
+}
+
+WebInspector.CSSWorkspaceBinding.LiveLocation.prototype = {
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetAdded: function(event)
+    {
+        console.assert(!this._header);
+        var header = /** @type {!WebInspector.CSSStyleSheetHeader} */ (event.data);
+        if (header.sourceURL && header.sourceURL === this.rawLocation().url)
+            this._setStyleSheet(header);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetRemoved: function(event)
+    {
+        console.assert(this._header);
+        var header = /** @type {!WebInspector.CSSStyleSheetHeader} */ (event.data);
+        if (this._header !== header)
+            return;
+        WebInspector.cssWorkspaceBinding._removeLiveLocation(this);
+        this._clearStyleSheet();
+    },
+
+    /**
+     * @param {!WebInspector.CSSStyleSheetHeader} header
+     */
+    _setStyleSheet: function(header)
+    {
+        this._header = header;
+        WebInspector.cssWorkspaceBinding._addLiveLocation(this);
+        this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetAdded, this);
+        this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this);
+    },
+
+    _clearStyleSheet: function()
+    {
+        delete this._header;
+        this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this);
+        this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetAdded, this);
+    },
+
+    /**
+     * @return {?WebInspector.UILocation}
+     */
+    uiLocation: function()
+    {
+        var cssLocation = /** @type WebInspector.CSSLocation */ (this.rawLocation());
+        if (this._header) {
+            var headerInfo = WebInspector.cssWorkspaceBinding._headerInfo(this._header);
+            return headerInfo._rawLocationToUILocation(cssLocation.lineNumber, cssLocation.columnNumber);
+        }
+        var uiSourceCode = WebInspector.workspace.uiSourceCodeForURL(cssLocation.url);
+        if (!uiSourceCode)
+            return null;
+        return uiSourceCode.uiLocation(cssLocation.lineNumber, cssLocation.columnNumber);
+    },
+
+    dispose: function()
+    {
+        WebInspector.LiveLocation.prototype.dispose.call(this);
+        if (this._header)
+            WebInspector.cssWorkspaceBinding._removeLiveLocation(this);
+        this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetAdded, this);
+        this._cssModel.removeEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this);
+    },
+
+    __proto__: WebInspector.LiveLocation.prototype
+}
+
+/**
  * @type {!WebInspector.CSSWorkspaceBinding}
  */
 WebInspector.cssWorkspaceBinding;