DevTools: expose wired front-end API for editors interop [blink]

Source/devtools/front_end/main/FrontendWebSocketAPI.js

Index: Source/devtools/front_end/main/FrontendWebSocketAPI.js
diff --git a/Source/devtools/front_end/main/FrontendWebSocketAPI.js b/Source/devtools/front_end/main/FrontendWebSocketAPI.js
new file mode 100644
index 0000000000000000000000000000000000000000..3a1813093832e8835510d413d322c0226ae3ba00
--- /dev/null
+++ b/Source/devtools/front_end/main/FrontendWebSocketAPI.js
@@ -0,0 +1,101 @@
+// Copyright 2015 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
+ */
+WebInspector.FrontendWebSocketAPI = function()
+{
+    InspectorFrontendHost.events.addEventListener(InspectorFrontendHostAPI.Events.DispatchFrontendAPIMessage, this._onFrontendAPIMessage, this);
+    InspectorFrontendHost.events.addEventListener(InspectorFrontendHostAPI.Events.FrontendAPIAttached, this._onAttach, this);
+    InspectorFrontendHost.events.addEventListener(InspectorFrontendHostAPI.Events.FrontendAPIDetached, this._onDetach, this);
+}
+
+WebInspector.FrontendWebSocketAPI.prototype = {
+    _onAttach: function()
+    {
+        WebInspector.workspace.addEventListener(WebInspector.Workspace.Events.UISourceCodeContentCommitted, this._workingCopyChanged, this);
+        WebInspector.workspace.addEventListener(WebInspector.Workspace.Events.UISourceCodeWorkingCopyChanged, this._workingCopyChanged, this);
+    },
+
+    _onDetach: function()
+    {
+        WebInspector.workspace.removeEventListener(WebInspector.Workspace.Events.UISourceCodeContentCommitted, this._workingCopyChanged, this);
+        WebInspector.workspace.removeEventListener(WebInspector.Workspace.Events.UISourceCodeWorkingCopyChanged, this._workingCopyChanged, this);
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _onFrontendAPIMessage: function(event)
+    {
+        var message = JSON.parse(/** @type {string} */ (event.data));
+        this._dispatchFrontendAPIMessage(message["id"], message["method"], message["params"] || null);
+    },
+
+    /**
+     * @param {number} id
+     * @param {string} method
+     * @param {?Object} params
+     */
+    _dispatchFrontendAPIMessage: function(id, method, params)
+    {
+        this._dispatchingFrontendMessage = true;
+        switch (method) {
+        case "Frontend.updateBuffer":
+            var file = params["file"];
+            var buffer = params["buffer"];
+            var save = params["save"];
+            var uiSourceCode = WebInspector.workspace.filesystemUISourceCode("file://" + file);
+            if (uiSourceCode) {
+                if (buffer !== uiSourceCode.workingCopy())
+                    uiSourceCode.setWorkingCopy(buffer);
+                if (save && uiSourceCode.workingCopy())
+                    uiSourceCode.commitWorkingCopy();
+                else if (uiSourceCode.workingCopy() === uiSourceCode.content())
+                    uiSourceCode.resetWorkingCopy();
+            }
+            this._issueResponse(id);
+            break;
+        default:
+            WebInspector.console.log("Unhandled API message: " + method);
+        }
+        this._dispatchingFrontendMessage = false;
+    },
+
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _workingCopyChanged: function(event)
+    {
+        if (this._dispatchingFrontendMessage)
+            return;
+        var uiSourceCode = /** @type {!WebInspector.UISourceCode} */ (event.data["uiSourceCode"]);
+        var url = uiSourceCode.originURL();
+        if (url.startsWith("file://"))
+            url = url.substring(7);
+        this._issueFrontendAPINotification("Frontend.bufferUpdated", { file: url, buffer: uiSourceCode.workingCopy() });
+    },
+
+    /**
+     * @param {number} id
+     * @param {!Object=} params
+     */
+    _issueResponse: function(id, params)
+    {
+        var object = {id: id};
+        if (params)
+            object.params = params;
+        InspectorFrontendHost.sendFrontendAPINotification(JSON.stringify(object));
+    },
+
+    /**
+     * @param {string} method
+     * @param {?Object} params
+     */
+    _issueFrontendAPINotification: function(method, params)
+    {
+        InspectorFrontendHost.sendFrontendAPINotification(JSON.stringify({ method: method, params: params }));
+    }
+}