Devtools: [WIP] Implement enhanced devtools extension language APIs

Source/devtools/front_end/languages/MultiLingualExecutionContext.js

Index: Source/devtools/front_end/languages/MultiLingualExecutionContext.js
diff --git a/Source/devtools/front_end/languages/MultiLingualExecutionContext.js b/Source/devtools/front_end/languages/MultiLingualExecutionContext.js
new file mode 100644
index 0000000000000000000000000000000000000000..3def58e726d24f27a3c4e5947c9d2b694091e79a
--- /dev/null
+++ b/Source/devtools/front_end/languages/MultiLingualExecutionContext.js
@@ -0,0 +1,98 @@
+// 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
+ * @extends {WebInspector.ExecutionContext}
+ * @param {!WebInspector.ExecutionContext} executionContext
+ */
+WebInspector.MultiLingualExecutionContext = function(executionContext)
+{
+    WebInspector.ExecutionContext.call(this, executionContext.runtimeModel.target(), executionContext.id, executionContext.name, executionContext.origin, executionContext.isMainWorldContext, executionContext.frameId);
+}
+
+WebInspector.MultiLingualExecutionContext.prototype = {
+     /**
+     * @param {!WebInspector.DebuggerModel.Location=} raw
+     */
+    _locationResolver: function(raw) {
+        if (!raw) return;
+        var loc = WebInspector.debuggerWorkspaceBinding.rawLocationToUILocation(raw);
+        return {
+            source: loc.uiSourceCode.uri(),
+            line: loc.lineNumber,
+            column: loc.columnNumber
+        };
+    },
+
+	 /**
+	 * @override
+     * @param {string} expression
+     * @param {string} objectGroup
+     * @param {boolean} includeCommandLineAPI
+     * @param {boolean} doNotPauseOnExceptionsAndMuteConsole
+     * @param {boolean} returnByValue
+     * @param {boolean} generatePreview
+     * @param {function(?WebInspector.RemoteObject, boolean, ?RuntimeAgent.RemoteObject=, ?DebuggerAgent.ExceptionDetails=)} callback
+     */
+    evaluate: function(expression, objectGroup, includeCommandLineAPI, doNotPauseOnExceptionsAndMuteConsole, returnByValue, generatePreview, callback)
+    {
+		var mime = WebInspector.ResourceType.fromActivePanel();
+		if (WebInspector.languageService.handles.transpile(mime)) {
+			var location = this._locationResolver(this.pauseLocation());
+			WebInspector.languageService.transpile(mime, expression, location).then(function(result) {
+				WebInspector.ExecutionContext.prototype.evaluate.call(this, result, objectGroup, includeCommandLineAPI, doNotPauseOnExceptionsAndMuteConsole, returnByValue, generatePreview, callback);
+			})
+			.catch(function(err) {
+				//TODO: decide how to handle errors?
+				throw err;
+			});
+		} else {
+			WebInspector.ExecutionContext.prototype.evaluate.call(this, expression, objectGroup, includeCommandLineAPI, doNotPauseOnExceptionsAndMuteConsole, returnByValue, generatePreview, callback);
+		}
+    },
+
+    /**
+     * @override
+     * @param {string} expressionString
+     * @param {string} text
+     * @param {number} cursorOffset
+     * @param {string} prefix
+     * @param {boolean} force
+     * @param {function(!Array.<string>, number=)} completionsReadyCallback
+     */
+    completionsForExpression: function(expressionString, text, cursorOffset, prefix, force, completionsReadyCallback)
+    {
+        function handleDebuggerCompletionsComplete(vals) {
+            if (!vals) {
+                completionsReadyCallback([]);
+            }
+            completionsReadyCallback(vals.map(function(v) { return v.text; }));
+        }
+
+        var location = this._locationResolver(this.pauseLocation());
+
+        //If possible, ceede to the language service
+        if (location) { //paused - get active mime from pause location
+            var mime = WebInspector.ResourceType.mimeFromURL(location.source);
+
+            if (WebInspector.languageService.handles.debuggerCompletions(mime)) {
+                WebInspector.languageService.debuggerCompletions(mime, text, cursorOffset, prefix, location).then(handleDebuggerCompletionsComplete);
+                return;
+            }
+        } else { //not paused - get active mime from source pane
+            var activeDocMime = WebInspector.ResourceType.fromActivePanel();
+            
+            if (WebInspector.languageService.handles.debuggerCompletions(activeDocMime)) {
+                WebInspector.languageService.debuggerCompletions(activeDocMime, text, cursorOffset, prefix, undefined).then(handleDebuggerCompletionsComplete);
+                return;
+            }
+        }
+        
+        //Fallback to the underlying context
+        WebInspector.ExecutionContext.prototype.completionsForExpression.call(this, expressionString, text, cursorOffset, prefix, force, completionsReadyCallback);
+    },
+
+    __proto__: WebInspector.ExecutionContext.prototype
+}