DevTools: [SASS] introduce workspace/cssModel adapter for SASS processor.

third_party/WebKit/Source/devtools/front_end/sass/SASSWorkspaceAdapter.js

Index: third_party/WebKit/Source/devtools/front_end/sass/SASSWorkspaceAdapter.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sass/SASSWorkspaceAdapter.js b/third_party/WebKit/Source/devtools/front_end/sass/SASSWorkspaceAdapter.js
new file mode 100644
index 0000000000000000000000000000000000000000..5dc3292aa35d1589bcca604fc88f81ca8b5cd3c7
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+++ b/third_party/WebKit/Source/devtools/front_end/sass/SASSWorkspaceAdapter.js
@@ -0,0 +1,461 @@
+// Copyright 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
+ * @param {!WebInspector.CSSStyleModel} cssModel
+ * @param {!WebInspector.Workspace} workspace
+ * @param {!WebInspector.NetworkMapping} networkMapping
+ */
+WebInspector.SASSWorkspaceAdapter = function(cssModel, workspace, networkMapping)
+{
+    this._workspace = workspace;
+    this._networkMapping = networkMapping;
+    this._cssModel = cssModel;
+
+    /** @type {!Map<string, number>} */
+    this._versions = new Map();
+    /** @type {!Map<string, !Promise<boolean>>} */
+    this._awaitingPromises = new Map();
+    /** @type {!Map<string, function(boolean)>} */
+    this._awaitingFulfills = new Map();
+
+    /** @type {!Multimap<string, !WebInspector.SourceMapTracker>} */
+    this._urlToTrackers = new Multimap();
+    /** @type {!Set<string>} */
+    this._cssURLs = new Set();
+
+    this._eventListeners = [
+        this._workspace.addEventListener(WebInspector.Workspace.Events.UISourceCodeAdded, this._uiSourceCodeAdded, this),
+        this._workspace.addEventListener(WebInspector.Workspace.Events.UISourceCodeRemoved, this._uiSourceCodeRemoved, this),
+        this._workspace.addEventListener(WebInspector.Workspace.Events.WorkingCopyChanged, this._uiSourceCodeChanged, this),
+        this._workspace.addEventListener(WebInspector.Workspace.Events.WorkingCopyCommitted, this._uiSourceCodeChanged, this),
+        this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetAdded, this._styleSheetAdded, this),
+        this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetRemoved, this._styleSheetRemoved, this),
+        this._cssModel.addEventListener(WebInspector.CSSStyleModel.Events.StyleSheetChanged, this._styleSheetChanged, this)
+    ];
+}
+
+/**
+ * @constructor
+ * @param {string} url
+ * @param {number} version
+ * @param {string} text
+ */
+WebInspector.SASSWorkspaceAdapter.ContentResponse = function(url, version, text)
+{
+    this.url = url;
+    this.version = version;
+    this.text = text;
+}
+
+WebInspector.SASSWorkspaceAdapter.prototype = {
+    /**
+     * @param {!WebInspector.SourceMap} sourceMap
+     * @return {!WebInspector.SourceMapTracker}
+     */
+    trackSources: function(sourceMap)
+    {
+        var cssURL = sourceMap.compiledURL();
+        this._cssURLs.add(cssURL);
+
+        var allSources = new Set(sourceMap.sources().concat(cssURL));
+        for (var sourceURL of allSources) {
+            if (this._versions.has(sourceURL))
+                continue;
+            this._versions.set(sourceURL, 1);
+            var promise = new Promise(fulfill => this._awaitingFulfills.set(sourceURL, fulfill));
+            this._awaitingPromises.set(sourceURL, promise);
+            var contentProvider = sourceURL === cssURL ? this._headersForURL(sourceURL).peekLast() : this._sassUISourceCode(sourceURL);
+            if (contentProvider)
+                this._contentProviderAdded(sourceURL);
+        }
+
+        var tracker = new WebInspector.SourceMapTracker(this, sourceMap);
+        for (var sourceURL of tracker.allURLs())
+            this._urlToTrackers.set(sourceURL, tracker);
+        return tracker;
+    },
+
+    /**
+     * @param {!WebInspector.SourceMapTracker} tracker
+     */
+    _stopTrackSources: function(tracker)
+    {
+        for (var sourceURL of tracker.allURLs()) {
+            this._urlToTrackers.remove(sourceURL, tracker);
+            if (!this._urlToTrackers.has(sourceURL)) {
+                this._awaitingFulfills.get(sourceURL).call(null, false);
+                this._awaitingFulfills.delete(sourceURL);
+                this._awaitingPromises.delete(sourceURL);
+                this._versions.delete(sourceURL);
+                this._cssURLs.delete(sourceURL);
+            }
+        }
+    },
+
+    /**
+     * @param {string} url
+     * @return {?WebInspector.UISourceCode}
+     */
+    _sassUISourceCode: function(url)
+    {
+        return this._networkMapping.uiSourceCodeForURLForAnyTarget(url);
+    },
+
+    /**
+     * @param {string} url
+     * @return {!Array<!WebInspector.CSSStyleSheetHeader>}
+     */
+    _headersForURL: function(url)
+    {
+        return this._cssModel.styleSheetIdsForURL(url)
+            .map(styleSheetId => this._cssModel.styleSheetHeaderForId(styleSheetId));
+    },
+
+    /**
+     * @param {string} url
+     */
+    _contentProviderAdded: function(url)
+    {
+        this._awaitingFulfills.get(url).call(null, true);
+    },
+
+    /**
+     * @param {string} url
+     */
+    _contentProviderRemoved: function(url)
+    {
+        var trackers = new Set(this._urlToTrackers.get(url));
+        for (var tracker of trackers)
+            tracker.dispose();
+    },
+
+    /**
+     * @param {string} url
+     * @return {boolean}
+     */
+    _isSASSURL: function(url)
+    {
+        return this._versions.has(url) && !this._cssURLs.has(url);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _uiSourceCodeAdded: function(event)
+    {
+        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */(event.data);
+        var url = this._networkMapping.networkURL(uiSourceCode);
+        if (!this._isSASSURL(url))
+            return;
+        this._contentProviderAdded(url);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _uiSourceCodeRemoved: function(event)
+    {
+        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */(event.data);
+        var url = this._networkMapping.networkURL(uiSourceCode);
+        if (!this._isSASSURL(url))
+            return;
+        this._contentProviderRemoved(url);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetAdded: function(event)
+    {
+        var styleSheetHeader = /** @type {!WebInspector.CSSStyleSheetHeader} */(event.data);
+        var url = styleSheetHeader.sourceURL;
+        if (!this._cssURLs.has(url))
+            return;
+        this._contentProviderAdded(url);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetRemoved: function(event)
+    {
+        var styleSheetHeader = /** @type {!WebInspector.CSSStyleSheetHeader} */(event.data);
+        var url = styleSheetHeader.sourceURL;
+        if (!this._cssURLs.has(url))
+            return;
+        var headers = this._headersForURL(url);
+        if (headers.length)
+            return;
+        this._contentProviderRemoved(url);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _uiSourceCodeChanged: function(event)
+    {
+        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */(event.data.uiSourceCode);
+        var url = this._networkMapping.networkURL(uiSourceCode);
+        if (!this._isSASSURL(url))
+            return;
+        this._newContentAvailable(url);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _styleSheetChanged: function(event)
+    {
+        var styleSheetId = /** @type {!CSSAgent.StyleSheetId} */(event.data.styleSheetId);
+        var styleSheetHeader = this._cssModel.styleSheetHeaderForId(styleSheetId);
+        var url = styleSheetHeader.sourceURL;
+        if (!this._cssURLs.has(url))
+            return;
+        this._newContentAvailable(url);
+    },
+
+    /**
+     * @param {string} url
+     */
+    _newContentAvailable: function(url)
+    {
+        console.assert(this._versions.has(url), "The '" + url + "' is not tracked.")
+        var newVersion = this._versions.get(url) + 1;
+        this._versions.set(url, newVersion);
+        for (var tracker of this._urlToTrackers.get(url))
+            tracker._newContentAvailable(url, newVersion);
+    },
+
+    /**
+     * @param {string} url
+     * @return {number}
+     */
+    _urlVersion: function(url)
+    {
+        var version = this._versions.get(url);
+        console.assert(version, "The '" + url + "' is not tracked.")
+        return version || 0;
+    },
+
+    /**
+     * @param {string} url
+     * @return {!Promise<?WebInspector.SASSWorkspaceAdapter.ContentResponse>}
+     */
+    _getContent: function(url)
+    {
+        console.assert(this._awaitingPromises.has(url), "The '" + url + "' is not tracked.")
+        return this._awaitingPromises.get(url)
+            .then(onContentProviderResolved.bind(this));
+
+        /**
+         * @param {boolean} success
+         * @return {!Promise<?WebInspector.SASSWorkspaceAdapter.ContentResponse>}
+         * @this {WebInspector.SASSWorkspaceAdapter}
+         */
+        function onContentProviderResolved(success)
+        {
+            if (!success)
+                return Promise.resolve(/** @type {?WebInspector.SASSWorkspaceAdapter.ContentResponse} */(null));
+            var contentProvider = this._cssURLs.has(url) ? this._headersForURL(url).peekLast() : this._sassUISourceCode(url);
+            if (!contentProvider)
+                return Promise.resolve(/** @type {?WebInspector.SASSWorkspaceAdapter.ContentResponse} */(null));
+            return contentProvider.requestContent()
+                .then(text => new WebInspector.SASSWorkspaceAdapter.ContentResponse(url, /** @type {number} */(this._versions.get(url)), text || ""));
+        }
+    },
+
+    /**
+     * @param {string} url
+     * @param {string} text
+     * @return {?WebInspector.SASSWorkspaceAdapter.ContentResponse}
+     */
+    _setSASSText: function(url, text)
+    {
+        console.assert(this._isSASSURL(url), "The url '" + url + "' should be a tracked SASS url");
+        var uiSourceCode = this._sassUISourceCode(url);
+        if (!uiSourceCode)
+            return null;
+        setImmediate(() => uiSourceCode.addRevision(text));
+        var futureVersion = this._versions.get(url) + 1;
+        return new WebInspector.SASSWorkspaceAdapter.ContentResponse(url, futureVersion, text);
+    },
+
+    /**
+     * @param {string} url
+     * @param {string} text
+     * @param {!Array<!WebInspector.SourceEdit>} cssEdits
+     * @return {?WebInspector.SASSWorkspaceAdapter.ContentResponse}
+     */
+    _setCSSText: function(url, text, cssEdits)
+    {
+        console.assert(this._cssURLs.has(url), "The url '" + url + "' should be a tracked CSS url");
+        var headers = this._headersForURL(url);
+        if (!headers.length)
+            return null;
+        for (var i = 0; i < headers.length; ++i)
+            this._cssModel.setStyleSheetText(headers[i].id, text, true);
+        for (var i = cssEdits.length - 1; i >= 0; --i) {
+            var edit = cssEdits[i];
+            var oldRange = edit.oldRange;
+            var newRange = edit.newRange();
+            for (var j = 0; j < headers.length; ++j) {
+                this._cssModel.dispatchEventToListeners(WebInspector.CSSStyleModel.Events.ExternalRangeEdit, {
+                    styleSheetId: headers[j].id,
+                    oldRange: oldRange,
+                    newRange: newRange
+                });
+            }
+        }
+        var futureVersion = this._versions.get(url) + headers.length;
+        return new WebInspector.SASSWorkspaceAdapter.ContentResponse(url, futureVersion, text);
+    }
+}
+
+/**
+ * @constructor
+ * @extends {WebInspector.Object}
+ * @param {!WebInspector.SASSWorkspaceAdapter} adapter
+ * @param {!WebInspector.SourceMap} sourceMap
+ */
+WebInspector.SourceMapTracker = function(adapter, sourceMap)
+{
+    WebInspector.Object.call(this);
+    this._adapter = adapter;
+    this._sourceMap = sourceMap;
+    this._cssURL = sourceMap.compiledURL();
+    this._sassURLs = sourceMap.sources().slice();
+    this._allURLs = this._sassURLs.concat(this._cssURL);
+    this._terminated = false;
+    this._versions = new Map();
+    for (var url of this._allURLs)
+        this._versions.set(url, adapter._urlVersion(url));
+}
+
+/** @enum {string} */
+WebInspector.SourceMapTracker.Events = {
+    SourceChanged: "SourceChanged",
+    TrackingStopped: "TrackingStopped"
+}
+
+WebInspector.SourceMapTracker.prototype = {
+    /**
+     * @return {!WebInspector.SourceMap}
+     */
+    sourceMap: function()
+    {
+        return this._sourceMap;
+    },
+
+    /**
+     * @return {!Array<string>}
+     */
+    allURLs: function()
+    {
+        return this._allURLs;
+    },
+
+    /**
+     * @return {string}
+     */
+    cssURL: function()
+    {
+        return this._cssURL;
+    },
+
+    /**
+     * @return {!Array<string>}
+     */
+    sassURLs: function()
+    {
+        return this._sassURLs;
+    },
+
+    /**
+     * @return {boolean}
+     */
+    isOutdated: function()
+    {
+        if (this._terminated)
+            return true;
+        for (var url of this._allURLs) {
+            if (this._adapter._urlVersion(url) > this._versions.get(url))
+                return true;
+        }
+        return false;
+    },
+
+    /**
+     * @param {string} text
+     * @param {!Array<!WebInspector.SourceEdit>} edits
+     * @return {boolean}
+     */
+    setCSSText: function(text, edits)
+    {
+        if (this._terminated || this.isOutdated())
+            return false;
+        var result = this._adapter._setCSSText(this._cssURL, text, edits);
+        this._handleContentResponse(result);
+        return !!result;
+    },
+
+    /**
+     * @param {string} url
+     * @param {string} text
+     * @return {boolean}
+     */
+    setSASSText: function(url, text)
+    {
+        if (this._terminated || this.isOutdated())
+            return false;
+        var result = this._adapter._setSASSText(url, text);
+        this._handleContentResponse(result);
+        return !!result;
+    },
+
+    /**
+     * @param {?WebInspector.SASSWorkspaceAdapter.ContentResponse} contentResponse
+     * @return {?string}
+     */
+    _handleContentResponse: function(contentResponse)
+    {
+        if (!contentResponse)
+            return null;
+        this._versions.set(contentResponse.url, contentResponse.version);
+        return contentResponse.text;
+    },
+
+    /**
+     * @param {string} url
+     * @return {!Promise<string>}
+     */
+    content: function(url)
+    {
+        return this._adapter._getContent(url)
+            .then(this._handleContentResponse.bind(this))
+            .then(text => text || "");
+    },
+
+    dispose: function()
+    {
+        if (this._terminated)
+            return;
+        this._terminated = true;
+        this._adapter._stopTrackSources(this);
+        this.dispatchEventToListeners(WebInspector.SourceMapTracker.Events.TrackingStopped);
+    },
+
+    /**
+     * @param {string} url
+     * @param {number} newVersion
+     */
+    _newContentAvailable: function(url, newVersion)
+    {
+        if (this._versions.get(url) < newVersion)
+            this.dispatchEventToListeners(WebInspector.SourceMapTracker.Events.SourceChanged, url);
+    },
+
+    __proto__: WebInspector.Object.prototype
+}