Bug 787975 - Make JSTerm $0 helper work across content processes. r=msucan.

--HG--
extra : rebase_source : b7a3a698effb0b223160fabae5b6f9b0fe820888

browser/devtools/webconsole/hudservice.js

@@ -580,6 +580,30 @@ WebConsole.prototype = {
     return null;
   },
 
+  /**
+   * Retrieves the current selection from the Inspector, if such a selection
+   * exists. This is used to pass the ID of the selected actor to the Web
+   * Console server for the $0 helper.
+   *
+   * @return object|null
+   *         A Selection referring to the currently selected node in the
+   *         Inspector.
+   *         If the inspector was never opened, or no node was ever selected,
+   *         then |null| is returned.
+   */
+  getInspectorSelection: function WC_getInspectorSelection()
+  {
+    let toolbox = gDevTools.getToolbox(this.target);
+    if (!toolbox) {
+      return null;
+    }
+    let panel = toolbox.getPanel("inspector");
+    if (!panel || !panel.selection) {
+      return null;
+    }
+    return panel.selection;
+  },
+
   /**
    * Destroy the object. Call this method to avoid memory leaks when the Web
    * Console is closed.

browser/devtools/webconsole/webconsole.js

@@ -3264,6 +3264,12 @@ JSTerm.prototype = {
       return;
     }
 
+    let selectedNodeActor = null;
+    let inspectorSelection = this.hud.owner.getInspectorSelection();
+    if (inspectorSelection) {
+      selectedNodeActor = inspectorSelection.nodeFront.actorID;
+    }
+
     let message = new Messages.Simple(aExecuteString, {
       category: "input",
       severity: "log",
@@ -3271,7 +3277,11 @@ JSTerm.prototype = {
     this.hud.output.addMessage(message);
     let onResult = this._executeResultCallback.bind(this, message, aCallback);
 
-    let options = { frame: this.SELECTED_FRAME };
+    let options = {
+      frame: this.SELECTED_FRAME,
+      selectedNodeActor: selectedNodeActor,
+    };
+
     this.requestEvaluation(aExecuteString, options).then(onResult, onResult);
 
     // Append a new value in the history of executed code, or overwrite the most
@@ -3301,6 +3311,9 @@ JSTerm.prototype = {
    *        user-selected stackframe.
    *        If you do not provide a |frame| the string will be evaluated in the
    *        global content window.
+   *        - selectedNodeActor: tells the NodeActor ID of the current selection in
+   *        the Inspector, if such a selection exists. This is used by helper
+   *        functions that can evaluate on the current selection.
    * @return object
    *         A promise object that is resolved when the server response is
    *         received.
@@ -3326,6 +3339,7 @@ JSTerm.prototype = {
     let evalOptions = {
       bindObjectActor: aOptions.bindObjectActor,
       frameActor: frameActor,
+      selectedNodeActor: aOptions.selectedNodeActor,
     };
 
     this.webConsoleClient.evaluateJS(aString, onResult, evalOptions);

toolkit/devtools/server/actors/webconsole.js

@@ -725,7 +725,9 @@ WebConsoleActor.prototype =
       bindObjectActor: aRequest.bindObjectActor,
       frameActor: aRequest.frameActor,
       url: aRequest.url,
+      selectedNodeActor: aRequest.selectedNodeActor,
     };
+
     let evalInfo = this.evalWithDebugger(input, evalOptions);
     let evalResult = evalInfo.result;
     let helperResult = evalInfo.helperResult;
@@ -967,6 +969,10 @@ WebConsoleActor.prototype =
    *          ObjectActor.
    *        - frameActor: the FrameActor ID to use for evaluation. The given
    *        debugger frame is used for evaluation, instead of the global window.
+   *        - selectedNodeActor: the NodeActor ID of the currently selected node
+   *        in the Inspector (or null, if there is no selection). This is used
+   *        for helper functions that make reference to the currently selected
+   *        node, like $0.
    * @return object
    *         An object that holds the following properties:
    *         - dbg: the debugger where the string was evaluated.
@@ -1031,6 +1037,13 @@ WebConsoleActor.prototype =
       bindings._self = bindSelf;
     }
 
+    if (aOptions.selectedNodeActor) {
+      let actor = this.conn.getActor(aOptions.selectedNodeActor);
+      if (actor) {
+        helpers.selectedNode = actor.rawNode;
+      }
+    }
+
     // Check if the Debugger.Frame or Debugger.Object for the global include
     // $ or $$. We will not overwrite these functions with the jsterm helpers.
     let found$ = false, found$$ = false;
@@ -1075,6 +1088,7 @@ WebConsoleActor.prototype =
     let helperResult = helpers.helperResult;
     delete helpers.evalInput;
     delete helpers.helperResult;
+    delete helpers.selectedNode;
 
     if ($) {
       bindings.$ = $;

toolkit/devtools/webconsole/client.js

@@ -104,6 +104,11 @@ WebConsoleClient.prototype = {
    *
    *        - url: the url to evaluate the script as. Defaults to
    *        "debugger eval code".
+   *
+   *        - selectedNodeActor: the NodeActor ID of the current selection in the
+   *        Inspector, if such a selection exists. This is used by helper functions
+   *        that can reference the currently selected node in the Inspector, like
+   *        $0.
    */
   evaluateJS: function WCC_evaluateJS(aString, aOnResponse, aOptions = {})
   {
@@ -114,6 +119,7 @@ WebConsoleClient.prototype = {
       bindObjectActor: aOptions.bindObjectActor,
       frameActor: aOptions.frameActor,
       url: aOptions.url,
+      selectedNodeActor: aOptions.selectedNodeActor,
     };
     this._client.request(packet, aOnResponse);
   },

toolkit/devtools/webconsole/utils.js

@@ -1563,38 +1563,12 @@ function JSTermHelpers(aOwner)
   /**
    * Returns the currently selected object in the highlighter.
    *
-   * TODO: this implementation crosses the client/server boundaries! This is not
+   * @return Object representing the current selection in the
-   * usable within a remote browser. To implement this feature correctly we need
+   *         Inspector, or null if no selection exists.
-   * support for remote inspection capabilities within the Inspector as well.
-   * See bug 787975.
-   *
-   * @return nsIDOMElement|null
-   *         The DOM element currently selected in the highlighter.
    */
-   Object.defineProperty(aOwner.sandbox, "$0", {
+  Object.defineProperty(aOwner.sandbox, "$0", {
     get: function() {
-      let window = aOwner.chromeWindow();
+      return aOwner.makeDebuggeeValue(aOwner.selectedNode)
-      if (!window) {
-        return null;
-      }
-
-      let target = null;
-      try {
-        target = devtools.TargetFactory.forTab(window.gBrowser.selectedTab);
-      }
-      catch (ex) {
-        // If we report this exception the user will get it in the Browser
-        // Console every time when she evaluates any string.
-      }
-
-      if (!target) {
-        return null;
-      }
-
-      let toolbox = gDevTools.getToolbox(target);
-      let node = toolbox && toolbox.selection ? toolbox.selection.node : null;
-
-      return node ? aOwner.makeDebuggeeValue(node) : null;
     },
     enumerable: true,
     configurable: false