src/third_party/WebKit/Source/devtools/front_end/components/ExecutionContextSelector.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @constructor
   7  * @implements {WebInspector.TargetManager.Observer}
   8  */
   9 WebInspector.ExecutionContextSelector = function() {
  10     WebInspector.targetManager.observeTargets(this);
  11 }
  12
  13 WebInspector.ExecutionContextSelector.prototype = {
  14
  15     /**
  16      * @param {!WebInspector.Target} target
  17      */
  18     targetAdded: function(target)
  19     {
  20         target.runtimeModel.addEventListener(WebInspector.RuntimeModel.Events.ExecutionContextCreated, this._onExecutionContextCreated, this);
  21         target.runtimeModel.addEventListener(WebInspector.RuntimeModel.Events.ExecutionContextDestroyed, this._onExecutionContextDestroyed, this);
  22     },
  23
  24     /**
  25      * @param {!WebInspector.Target} target
  26      */
  27     targetRemoved: function(target)
  28     {
  29         target.runtimeModel.removeEventListener(WebInspector.RuntimeModel.Events.ExecutionContextCreated, this._onExecutionContextCreated, this);
  30         target.runtimeModel.removeEventListener(WebInspector.RuntimeModel.Events.ExecutionContextDestroyed, this._onExecutionContextDestroyed, this);
  31         if (WebInspector.context.flavor(WebInspector.ExecutionContext).target() === target)
  32             this._currentExecutionContextGone();
  33     },
  34
  35     /**
  36      * @param {!WebInspector.Event} event
  37      */
  38     _onExecutionContextCreated: function(event)
  39     {
  40         var executionContext = /** @type {!WebInspector.ExecutionContext}*/ (event.data);
  41         if (!WebInspector.context.flavor(WebInspector.ExecutionContext))
  42             WebInspector.context.setFlavor(WebInspector.ExecutionContext, executionContext);
  43     },
  44
  45     /**
  46      * @param {!WebInspector.Event} event
  47      */
  48     _onExecutionContextDestroyed: function(event)
  49     {
  50         var executionContext = /** @type {!WebInspector.ExecutionContext}*/ (event.data);
  51         if (WebInspector.context.flavor(WebInspector.ExecutionContext) === executionContext)
  52             this._currentExecutionContextGone();
  53     },
  54
  55     _currentExecutionContextGone: function()
  56     {
  57         var targets = WebInspector.targetManager.targets();
  58         var newContext = null;
  59         for (var i = 0; i < targets.length; ++i) {
  60             var executionContexts = targets[i].runtimeModel.executionContexts();
  61             if (executionContexts.length) {
  62                 newContext = executionContexts[0];
  63                 break;
  64             }
  65         }
  66         WebInspector.context.setFlavor(WebInspector.ExecutionContext, newContext);
  67     }
  68
  69 }
  70
  71 /**
  72  * @param {!Element} proxyElement
  73  * @param {!Range} wordRange
  74  * @param {boolean} force
  75  * @param {function(!Array.<string>, number=)} completionsReadyCallback
  76  */
  77 WebInspector.ExecutionContextSelector.completionsForTextPromptInCurrentContext = function(proxyElement, wordRange, force, completionsReadyCallback)
  78 {
  79     var executionContext = WebInspector.context.flavor(WebInspector.ExecutionContext);
  80     if (!executionContext) {
  81         completionsReadyCallback([]);
  82         return;
  83     }
  84
  85     // Pass less stop characters to rangeOfWord so the range will be a more complete expression.
  86     var expressionRange = wordRange.startContainer.rangeOfWord(wordRange.startOffset, " =:[({;,!+-*/&|^<>", proxyElement, "backward");
  87     var expressionString = expressionRange.toString();
  88     var prefix = wordRange.toString();
  89     executionContext.completionsForExpression(expressionString, prefix, force, completionsReadyCallback);
  90 }