Source/WebInspectorUI/UserInterface/Views/QuickConsole.js - WebKit - Git at Google

 /*
  * Copyright (C) 2013-2016 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 WI.QuickConsole = class QuickConsole extends WI.View
 {
     constructor(element)
     {
         super(element);

         this._toggleOrFocusKeyboardShortcut = new WI.KeyboardShortcut(null, WI.KeyboardShortcut.Key.Escape, this._toggleOrFocus.bind(this));
         this._toggleOrFocusKeyboardShortcut.implicitlyPreventsDefault = false;
         this._keyboardShortcutDisabled = false;

         this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
         this._restoreSelectedExecutionContextForFrame = null;

         this.element.classList.add("quick-console");
         this.element.addEventListener("mousedown", this._handleMouseDown.bind(this));
         this.element.addEventListener("dragover", this._handleDragOver.bind(this));
         this.element.addEventListener("drop", this._handleDrop.bind(this), true); // Ensure that dropping a DOM node doesn't copy text.

         this.prompt = new WI.ConsolePrompt(null, "text/javascript");
         this.addSubview(this.prompt);

         // FIXME: CodeMirror 4 has a default "Esc" key handler that always prevents default.
         // Our keyboard shortcut above will respect the default prevented and ignore the event
         // and not toggle the console. Install our own Escape key handler that will trigger
         // when the ConsolePrompt is empty, to restore toggling behavior. A better solution
         // would be for CodeMirror's event handler to pass if it doesn't do anything.
         this.prompt.escapeKeyHandlerWhenEmpty = function() { WI.toggleSplitConsole(); };

         const navigationbarElement = null;
         this._navigationBar = new WI.NavigationBar(navigationbarElement, {sizesToFit: true});
         this.addSubview(this._navigationBar);

         this._activeExecutionContextNavigationItemDivider = new WI.DividerNavigationItem;
         this._navigationBar.addNavigationItem(this._activeExecutionContextNavigationItemDivider);

         this._activeExecutionContextNavigationItem = new WI.NavigationItem("active-execution-context");
         WI.addMouseDownContextMenuHandlers(this._activeExecutionContextNavigationItem.element, this._populateActiveExecutionContextNavigationItemContextMenu.bind(this));
         this._navigationBar.addNavigationItem(this._activeExecutionContextNavigationItem);

         this._updateActiveExecutionContextDisplay();

         WI.settings.consoleSavedResultAlias.addEventListener(WI.Setting.Event.Changed, this._handleConsoleSavedResultAliasSettingChanged, this);
         WI.settings.engineeringShowInternalExecutionContexts.addEventListener(WI.Setting.Event.Changed, this._handleEngineeringShowInternalExecutionContextsSettingChanged, this);

         WI.Frame.addEventListener(WI.Frame.Event.PageExecutionContextChanged, this._handleFramePageExecutionContextChanged, this);
         WI.Frame.addEventListener(WI.Frame.Event.ExecutionContextsCleared, this._handleFrameExecutionContextsCleared, this);

         WI.debuggerManager.addEventListener(WI.DebuggerManager.Event.ActiveCallFrameDidChange, this._handleDebuggerActiveCallFrameDidChange, this);

         WI.runtimeManager.addEventListener(WI.RuntimeManager.Event.ActiveExecutionContextChanged, this._handleActiveExecutionContextChanged, this);

         WI.notifications.addEventListener(WI.Notification.TransitionPageTarget, this._handleTransitionPageTarget, this);

         WI.targetManager.addEventListener(WI.TargetManager.Event.TargetRemoved, this._handleTargetRemoved, this);

         WI.domManager.addEventListener(WI.DOMManager.Event.InspectedNodeChanged, this._handleInspectedNodeChanged, this);

         WI.consoleDrawer.toggleButtonShortcutTooltip(this._toggleOrFocusKeyboardShortcut);
         WI.consoleDrawer.addEventListener(WI.ConsoleDrawer.Event.CollapsedStateChanged, this._updateStyles, this);
         WI.TabBrowser.addEventListener(WI.TabBrowser.Event.SelectedTabContentViewDidChange, this._updateStyles, this);

         WI.whenTargetsAvailable().then(() => {
             this._updateActiveExecutionContextDisplay();
         });
     }

     // Public

     set keyboardShortcutDisabled(disabled)
     {
         this._keyboardShortcutDisabled = disabled;
     }

     closed()
     {
         WI.settings.consoleSavedResultAlias.removeEventListener(null, null, this);
         WI.Frame.removeEventListener(null, null, this);
         WI.debuggerManager.removeEventListener(null, null, this);
         WI.runtimeManager.removeEventListener(null, null, this);
         WI.targetManager.removeEventListener(null, null, this);
         WI.consoleDrawer.removeEventListener(null, null, this);
         WI.TabBrowser.removeEventListener(null, null, this);

         super.closed();
     }

     // Private

     _displayNameForExecutionContext(context, maxLength = Infinity)
     {
         function truncate(string, length) {
             if (!Number.isFinite(maxLength))
                 return string;
             return string.trim().truncateMiddle(length);
         }

         if (context.type === WI.ExecutionContext.Type.Internal)
             return WI.unlocalizedString("[Internal] ") + context.name;

         if (context.type === WI.ExecutionContext.Type.User) {
             let extensionName = WI.browserManager.extensionNameForExecutionContext(context);
             if (extensionName)
                 return truncate(extensionName, maxLength);
         }

         let target = context.target;
         if (target.type === WI.TargetType.Worker)
             return truncate(target.displayName, maxLength);

         let frame = context.frame;
         if (frame) {
             if (context === frame.executionContextList.pageExecutionContext) {
                 let resourceName = frame.mainResource.displayName;
                 let frameName = frame.name;
                 if (frameName) {
                     // Attempt to show all of the frame name, but ensure that at least 20 characters
                     // of the resource name are shown as well.
                     let frameNameMaxLength = Math.max(maxLength - resourceName.length, 20);
                     return WI.UIString("%s (%s)").format(truncate(frameName, frameNameMaxLength), truncate(resourceName, maxLength - frameNameMaxLength));
                 }
                 return truncate(resourceName, maxLength);
             }
         }

         return truncate(context.name, maxLength);
     }

     _resolveDesiredActiveExecutionContext(forceInspectedNode)
     {
         let executionContext = null;

         if (this._useExecutionContextOfInspectedNode || forceInspectedNode) {
             let inspectedNode = WI.domManager.inspectedNode;
             if (inspectedNode) {
                 let frame = inspectedNode.frame;
                 if (frame) {
                     let pageExecutionContext = frame.pageExecutionContext;
                     if (pageExecutionContext)
                         executionContext = pageExecutionContext;
                 }
             }
         }

         if (!executionContext && WI.networkManager.mainFrame)
             executionContext = WI.networkManager.mainFrame.pageExecutionContext;

         return executionContext || WI.mainTarget.executionContext;
     }

     _setActiveExecutionContext(context)
     {
         let wasActive = WI.runtimeManager.activeExecutionContext === context;

         WI.runtimeManager.activeExecutionContext = context;

         if (wasActive)
             this._updateActiveExecutionContextDisplay();
     }

     _updateActiveExecutionContextDisplay()
     {
         let toggleHidden = (hidden) => {
             this._activeExecutionContextNavigationItemDivider.hidden = hidden;
             this._activeExecutionContextNavigationItem.hidden = hidden;
         };

         if (WI.debuggerManager.activeCallFrame) {
             toggleHidden(true);
             return;
         }

         if (!WI.runtimeManager.activeExecutionContext || !WI.networkManager.mainFrame) {
             toggleHidden(true);
             return;
         }

         if (WI.networkManager.frames.length === 1 && !WI.targetManager.workerTargets.length) {
             let mainFrameContexts = WI.networkManager.mainFrame.executionContextList.contexts;
             let contextsToShow = mainFrameContexts.filter((context) => context.type !== WI.ExecutionContext.Type.Internal || WI.settings.engineeringShowInternalExecutionContexts.value);
             if (contextsToShow.length <= 1) {
                 toggleHidden(true);
                 return;
             }
         }

         const maxLength = 40;

         if (this._useExecutionContextOfInspectedNode) {
             this._activeExecutionContextNavigationItem.element.classList.add("automatic");
             this._activeExecutionContextNavigationItem.element.textContent = WI.UIString("Auto \u2014 %s").format(this._displayNameForExecutionContext(WI.runtimeManager.activeExecutionContext, maxLength));
             this._activeExecutionContextNavigationItem.tooltip = WI.UIString("Execution context for %s").format(WI.RuntimeManager.preferredSavedResultPrefix() + "0");
         } else {
             this._activeExecutionContextNavigationItem.element.classList.remove("automatic");
             this._activeExecutionContextNavigationItem.element.textContent = this._displayNameForExecutionContext(WI.runtimeManager.activeExecutionContext, maxLength);
             this._activeExecutionContextNavigationItem.tooltip = this._displayNameForExecutionContext(WI.runtimeManager.activeExecutionContext);
         }

         this._activeExecutionContextNavigationItem.element.appendChild(WI.ImageUtilities.useSVGSymbol("Images/UpDownArrows.svg", "selector-arrows"));

         toggleHidden(false);
     }

     _populateActiveExecutionContextNavigationItemContextMenu(contextMenu)
     {
         const maxLength = 120;

         let activeExecutionContext = WI.runtimeManager.activeExecutionContext;

         if (InspectorBackend.hasDomain("DOM")) {
             let executionContextForInspectedNode = this._resolveDesiredActiveExecutionContext(true);
             contextMenu.appendCheckboxItem(WI.UIString("Auto \u2014 %s").format(this._displayNameForExecutionContext(executionContextForInspectedNode, maxLength)), () => {
                 this._useExecutionContextOfInspectedNode = true;
                 this._setActiveExecutionContext(executionContextForInspectedNode);
             }, this._useExecutionContextOfInspectedNode);

             contextMenu.appendSeparator();
         }

         let indent = 0;
         let addExecutionContext = (context) => {
             if (context.type === WI.ExecutionContext.Type.Internal && !WI.settings.engineeringShowInternalExecutionContexts.value)
                 return;

             let additionalIndent = (context.frame && context !== context.frame.executionContextList.pageExecutionContext) || context.type !== WI.ExecutionContext.Type.Normal;

             // Mimic macOS `-[NSMenuItem setIndentationLevel]`.
             contextMenu.appendCheckboxItem("   ".repeat(indent + additionalIndent) + this._displayNameForExecutionContext(context, maxLength), () => {
                 this._useExecutionContextOfInspectedNode = false;
                 this._setActiveExecutionContext(context);
             }, activeExecutionContext === context);
         };

         let addExecutionContextsForFrame = (frame) => {
             let pageExecutionContext = frame.executionContextList.pageExecutionContext;

             let contexts = frame.executionContextList.contexts.sort((a, b) => {
                 if (a === pageExecutionContext)
                     return -1;
                 if (b === pageExecutionContext)
                     return 1;

                 const executionContextTypeRanking = [
                     WI.ExecutionContext.Type.Normal,
                     WI.ExecutionContext.Type.User,
                     WI.ExecutionContext.Type.Internal,
                 ];
                 return executionContextTypeRanking.indexOf(a.type) - executionContextTypeRanking.indexOf(b.type);
             });
             for (let context of contexts)
                 addExecutionContext(context);
         };

         let mainFrame = WI.networkManager.mainFrame;
         addExecutionContextsForFrame(mainFrame);

         indent = 1;

         let otherFrames = WI.networkManager.frames.filter((frame) => frame !== mainFrame && frame.executionContextList.pageExecutionContext);
         if (otherFrames.length) {
             contextMenu.appendHeader(WI.UIString("Frames"));

             for (let frame of otherFrames)
                 addExecutionContextsForFrame(frame);
         }

         let workerTargets = WI.targetManager.workerTargets;
         if (workerTargets.length) {
             contextMenu.appendHeader(WI.UIString("Workers"));

             for (let target of workerTargets)
                 addExecutionContext(target.executionContext);
         }
     }

     _handleMouseDown(event)
     {
         if (event.target !== this.element)
             return;

         event.preventDefault();
         this.prompt.focus();
     }

     _handleDragOver(event)
     {
         if (event.dataTransfer.types.includes(WI.DOMTreeOutline.DOMNodeIdDragType)) {
             event.preventDefault();
             event.dataTransfer.dropEffect = "copy";
         }
     }

     _handleDrop(event)
     {
         let domNodeId = event.dataTransfer.getData(WI.DOMTreeOutline.DOMNodeIdDragType);
         if (domNodeId) {
             event.preventDefault();

             let domNode = WI.domManager.nodeForId(domNodeId);
             WI.RemoteObject.resolveNode(domNode, WI.RuntimeManager.ConsoleObjectGroup)
             .then((remoteObject) => {
                 let text = domNode.nodeType() === Node.ELEMENT_NODE ? WI.UIString("Dropped Element") : WI.UIString("Dropped Node");
                 const addSpecialUserLogClass = true;
                 WI.consoleLogViewController.appendImmediateExecutionWithResult(text, remoteObject, addSpecialUserLogClass);

                 this.prompt.focus();
             });
         }
     }

     _handleConsoleSavedResultAliasSettingChanged()
     {
         this._updateActiveExecutionContextDisplay();
     }

     _handleEngineeringShowInternalExecutionContextsSettingChanged(event)
     {
         this._updateActiveExecutionContextDisplay();

         if (WI.runtimeManager.activeExecutionContext.type !== WI.ExecutionContext.Type.Internal)
             return;

         this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
         this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
     }

     _handleFramePageExecutionContextChanged(event)
     {
         let frame = event.target;

         if (this._restoreSelectedExecutionContextForFrame !== frame)
             return;

         this._restoreSelectedExecutionContextForFrame = null;

         this._useExecutionContextOfInspectedNode = false;
         this._setActiveExecutionContext(frame.pageExecutionContext);
     }

     _handleFrameExecutionContextsCleared(event)
     {
         let {committingProvisionalLoad, contexts} = event.data;

         let hasActiveExecutionContext = contexts.some((context) => context === WI.runtimeManager.activeExecutionContext);
         if (!hasActiveExecutionContext)
             return;

         // If this frame is navigating and it is selected in the UI we want to reselect its new item after navigation.
         if (committingProvisionalLoad && !this._restoreSelectedExecutionContextForFrame) {
             this._restoreSelectedExecutionContextForFrame = event.target;

             // As a fail safe, if the frame never gets an execution context, clear the restore value.
             setTimeout(() => {
                 this._restoreSelectedExecutionContextForFrame = null;
             }, 10);
             return;
         }

         this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
         this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
     }

     _handleDebuggerActiveCallFrameDidChange(event)
     {
         this._updateActiveExecutionContextDisplay();
     }

     _handleActiveExecutionContextChanged(event)
     {
         this._updateActiveExecutionContextDisplay();
     }

     _handleTransitionPageTarget()
     {
         this._updateActiveExecutionContextDisplay();
     }

     _handleTargetRemoved(event)
     {
         let {target} = event.data;
         if (target !== WI.runtimeManager.activeExecutionContext)
             return;

         this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
         this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
     }

     _handleInspectedNodeChanged(event)
     {
         if (!this._useExecutionContextOfInspectedNode)
             return;

         this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
     }

     _toggleOrFocus(event)
     {
         if (this._keyboardShortcutDisabled)
             return;

         if (this.prompt.focused) {
             WI.toggleSplitConsole();
             event.preventDefault();
         } else if (!WI.isEditingAnyField() && !WI.isEventTargetAnEditableField(event)) {
             this.prompt.focus();
             event.preventDefault();
         }
     }

     _updateStyles()
     {
         this.element.classList.toggle("showing-log", WI.isShowingConsoleTab() || WI.isShowingSplitConsole());
     }
 };
	/*
	* Copyright (C) 2013-2016 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	WI.QuickConsole = class QuickConsole extends WI.View
	{
	constructor(element)
	{
	super(element);

	this._toggleOrFocusKeyboardShortcut = new WI.KeyboardShortcut(null, WI.KeyboardShortcut.Key.Escape, this._toggleOrFocus.bind(this));
	this._toggleOrFocusKeyboardShortcut.implicitlyPreventsDefault = false;
	this._keyboardShortcutDisabled = false;

	this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
	this._restoreSelectedExecutionContextForFrame = null;

	this.element.classList.add("quick-console");
	this.element.addEventListener("mousedown", this._handleMouseDown.bind(this));
	this.element.addEventListener("dragover", this._handleDragOver.bind(this));
	this.element.addEventListener("drop", this._handleDrop.bind(this), true); // Ensure that dropping a DOM node doesn't copy text.

	this.prompt = new WI.ConsolePrompt(null, "text/javascript");
	this.addSubview(this.prompt);

	// FIXME: CodeMirror 4 has a default "Esc" key handler that always prevents default.
	// Our keyboard shortcut above will respect the default prevented and ignore the event
	// and not toggle the console. Install our own Escape key handler that will trigger
	// when the ConsolePrompt is empty, to restore toggling behavior. A better solution
	// would be for CodeMirror's event handler to pass if it doesn't do anything.
	this.prompt.escapeKeyHandlerWhenEmpty = function() { WI.toggleSplitConsole(); };

	const navigationbarElement = null;
	this._navigationBar = new WI.NavigationBar(navigationbarElement, {sizesToFit: true});
	this.addSubview(this._navigationBar);

	this._activeExecutionContextNavigationItemDivider = new WI.DividerNavigationItem;
	this._navigationBar.addNavigationItem(this._activeExecutionContextNavigationItemDivider);

	this._activeExecutionContextNavigationItem = new WI.NavigationItem("active-execution-context");
	WI.addMouseDownContextMenuHandlers(this._activeExecutionContextNavigationItem.element, this._populateActiveExecutionContextNavigationItemContextMenu.bind(this));
	this._navigationBar.addNavigationItem(this._activeExecutionContextNavigationItem);

	this._updateActiveExecutionContextDisplay();

	WI.settings.consoleSavedResultAlias.addEventListener(WI.Setting.Event.Changed, this._handleConsoleSavedResultAliasSettingChanged, this);
	WI.settings.engineeringShowInternalExecutionContexts.addEventListener(WI.Setting.Event.Changed, this._handleEngineeringShowInternalExecutionContextsSettingChanged, this);

	WI.Frame.addEventListener(WI.Frame.Event.PageExecutionContextChanged, this._handleFramePageExecutionContextChanged, this);
	WI.Frame.addEventListener(WI.Frame.Event.ExecutionContextsCleared, this._handleFrameExecutionContextsCleared, this);

	WI.debuggerManager.addEventListener(WI.DebuggerManager.Event.ActiveCallFrameDidChange, this._handleDebuggerActiveCallFrameDidChange, this);

	WI.runtimeManager.addEventListener(WI.RuntimeManager.Event.ActiveExecutionContextChanged, this._handleActiveExecutionContextChanged, this);

	WI.notifications.addEventListener(WI.Notification.TransitionPageTarget, this._handleTransitionPageTarget, this);

	WI.targetManager.addEventListener(WI.TargetManager.Event.TargetRemoved, this._handleTargetRemoved, this);

	WI.domManager.addEventListener(WI.DOMManager.Event.InspectedNodeChanged, this._handleInspectedNodeChanged, this);

	WI.consoleDrawer.toggleButtonShortcutTooltip(this._toggleOrFocusKeyboardShortcut);
	WI.consoleDrawer.addEventListener(WI.ConsoleDrawer.Event.CollapsedStateChanged, this._updateStyles, this);
	WI.TabBrowser.addEventListener(WI.TabBrowser.Event.SelectedTabContentViewDidChange, this._updateStyles, this);

	WI.whenTargetsAvailable().then(() => {
	this._updateActiveExecutionContextDisplay();
	});
	}

	// Public

	set keyboardShortcutDisabled(disabled)
	{
	this._keyboardShortcutDisabled = disabled;
	}

	closed()
	{
	WI.settings.consoleSavedResultAlias.removeEventListener(null, null, this);
	WI.Frame.removeEventListener(null, null, this);
	WI.debuggerManager.removeEventListener(null, null, this);
	WI.runtimeManager.removeEventListener(null, null, this);
	WI.targetManager.removeEventListener(null, null, this);
	WI.consoleDrawer.removeEventListener(null, null, this);
	WI.TabBrowser.removeEventListener(null, null, this);

	super.closed();
	}

	// Private

	_displayNameForExecutionContext(context, maxLength = Infinity)
	{
	function truncate(string, length) {
	if (!Number.isFinite(maxLength))
	return string;
	return string.trim().truncateMiddle(length);
	}

	if (context.type === WI.ExecutionContext.Type.Internal)
	return WI.unlocalizedString("[Internal] ") + context.name;

	if (context.type === WI.ExecutionContext.Type.User) {
	let extensionName = WI.browserManager.extensionNameForExecutionContext(context);
	if (extensionName)
	return truncate(extensionName, maxLength);
	}

	let target = context.target;
	if (target.type === WI.TargetType.Worker)
	return truncate(target.displayName, maxLength);

	let frame = context.frame;
	if (frame) {
	if (context === frame.executionContextList.pageExecutionContext) {
	let resourceName = frame.mainResource.displayName;
	let frameName = frame.name;
	if (frameName) {
	// Attempt to show all of the frame name, but ensure that at least 20 characters
	// of the resource name are shown as well.
	let frameNameMaxLength = Math.max(maxLength - resourceName.length, 20);
	return WI.UIString("%s (%s)").format(truncate(frameName, frameNameMaxLength), truncate(resourceName, maxLength - frameNameMaxLength));
	}
	return truncate(resourceName, maxLength);
	}
	}

	return truncate(context.name, maxLength);
	}

	_resolveDesiredActiveExecutionContext(forceInspectedNode)
	{
	let executionContext = null;

	if (this._useExecutionContextOfInspectedNode \|\| forceInspectedNode) {
	let inspectedNode = WI.domManager.inspectedNode;
	if (inspectedNode) {
	let frame = inspectedNode.frame;
	if (frame) {
	let pageExecutionContext = frame.pageExecutionContext;
	if (pageExecutionContext)
	executionContext = pageExecutionContext;
	}
	}
	}

	if (!executionContext && WI.networkManager.mainFrame)
	executionContext = WI.networkManager.mainFrame.pageExecutionContext;

	return executionContext \|\| WI.mainTarget.executionContext;
	}

	_setActiveExecutionContext(context)
	{
	let wasActive = WI.runtimeManager.activeExecutionContext === context;

	WI.runtimeManager.activeExecutionContext = context;

	if (wasActive)
	this._updateActiveExecutionContextDisplay();
	}

	_updateActiveExecutionContextDisplay()
	{
	let toggleHidden = (hidden) => {
	this._activeExecutionContextNavigationItemDivider.hidden = hidden;
	this._activeExecutionContextNavigationItem.hidden = hidden;
	};

	if (WI.debuggerManager.activeCallFrame) {
	toggleHidden(true);
	return;
	}

	if (!WI.runtimeManager.activeExecutionContext \|\| !WI.networkManager.mainFrame) {
	toggleHidden(true);
	return;
	}

	if (WI.networkManager.frames.length === 1 && !WI.targetManager.workerTargets.length) {
	let mainFrameContexts = WI.networkManager.mainFrame.executionContextList.contexts;
	let contextsToShow = mainFrameContexts.filter((context) => context.type !== WI.ExecutionContext.Type.Internal \|\| WI.settings.engineeringShowInternalExecutionContexts.value);
	if (contextsToShow.length <= 1) {
	toggleHidden(true);
	return;
	}
	}

	const maxLength = 40;

	if (this._useExecutionContextOfInspectedNode) {
	this._activeExecutionContextNavigationItem.element.classList.add("automatic");
	this._activeExecutionContextNavigationItem.element.textContent = WI.UIString("Auto \u2014 %s").format(this._displayNameForExecutionContext(WI.runtimeManager.activeExecutionContext, maxLength));
	this._activeExecutionContextNavigationItem.tooltip = WI.UIString("Execution context for %s").format(WI.RuntimeManager.preferredSavedResultPrefix() + "0");
	} else {
	this._activeExecutionContextNavigationItem.element.classList.remove("automatic");
	this._activeExecutionContextNavigationItem.element.textContent = this._displayNameForExecutionContext(WI.runtimeManager.activeExecutionContext, maxLength);
	this._activeExecutionContextNavigationItem.tooltip = this._displayNameForExecutionContext(WI.runtimeManager.activeExecutionContext);
	}

	this._activeExecutionContextNavigationItem.element.appendChild(WI.ImageUtilities.useSVGSymbol("Images/UpDownArrows.svg", "selector-arrows"));

	toggleHidden(false);
	}

	_populateActiveExecutionContextNavigationItemContextMenu(contextMenu)
	{
	const maxLength = 120;

	let activeExecutionContext = WI.runtimeManager.activeExecutionContext;

	if (InspectorBackend.hasDomain("DOM")) {
	let executionContextForInspectedNode = this._resolveDesiredActiveExecutionContext(true);
	contextMenu.appendCheckboxItem(WI.UIString("Auto \u2014 %s").format(this._displayNameForExecutionContext(executionContextForInspectedNode, maxLength)), () => {
	this._useExecutionContextOfInspectedNode = true;
	this._setActiveExecutionContext(executionContextForInspectedNode);
	}, this._useExecutionContextOfInspectedNode);

	contextMenu.appendSeparator();
	}

	let indent = 0;
	let addExecutionContext = (context) => {
	if (context.type === WI.ExecutionContext.Type.Internal && !WI.settings.engineeringShowInternalExecutionContexts.value)
	return;

	let additionalIndent = (context.frame && context !== context.frame.executionContextList.pageExecutionContext) \|\| context.type !== WI.ExecutionContext.Type.Normal;

	// Mimic macOS `-[NSMenuItem setIndentationLevel]`.
	contextMenu.appendCheckboxItem(" ".repeat(indent + additionalIndent) + this._displayNameForExecutionContext(context, maxLength), () => {
	this._useExecutionContextOfInspectedNode = false;
	this._setActiveExecutionContext(context);
	}, activeExecutionContext === context);
	};

	let addExecutionContextsForFrame = (frame) => {
	let pageExecutionContext = frame.executionContextList.pageExecutionContext;

	let contexts = frame.executionContextList.contexts.sort((a, b) => {
	if (a === pageExecutionContext)
	return -1;
	if (b === pageExecutionContext)
	return 1;

	const executionContextTypeRanking = [
	WI.ExecutionContext.Type.Normal,
	WI.ExecutionContext.Type.User,
	WI.ExecutionContext.Type.Internal,
	];
	return executionContextTypeRanking.indexOf(a.type) - executionContextTypeRanking.indexOf(b.type);
	});
	for (let context of contexts)
	addExecutionContext(context);
	};

	let mainFrame = WI.networkManager.mainFrame;
	addExecutionContextsForFrame(mainFrame);

	indent = 1;

	let otherFrames = WI.networkManager.frames.filter((frame) => frame !== mainFrame && frame.executionContextList.pageExecutionContext);
	if (otherFrames.length) {
	contextMenu.appendHeader(WI.UIString("Frames"));

	for (let frame of otherFrames)
	addExecutionContextsForFrame(frame);
	}

	let workerTargets = WI.targetManager.workerTargets;
	if (workerTargets.length) {
	contextMenu.appendHeader(WI.UIString("Workers"));

	for (let target of workerTargets)
	addExecutionContext(target.executionContext);
	}
	}

	_handleMouseDown(event)
	{
	if (event.target !== this.element)
	return;

	event.preventDefault();
	this.prompt.focus();
	}

	_handleDragOver(event)
	{
	if (event.dataTransfer.types.includes(WI.DOMTreeOutline.DOMNodeIdDragType)) {
	event.preventDefault();
	event.dataTransfer.dropEffect = "copy";
	}
	}

	_handleDrop(event)
	{
	let domNodeId = event.dataTransfer.getData(WI.DOMTreeOutline.DOMNodeIdDragType);
	if (domNodeId) {
	event.preventDefault();

	let domNode = WI.domManager.nodeForId(domNodeId);
	WI.RemoteObject.resolveNode(domNode, WI.RuntimeManager.ConsoleObjectGroup)
	.then((remoteObject) => {
	let text = domNode.nodeType() === Node.ELEMENT_NODE ? WI.UIString("Dropped Element") : WI.UIString("Dropped Node");
	const addSpecialUserLogClass = true;
	WI.consoleLogViewController.appendImmediateExecutionWithResult(text, remoteObject, addSpecialUserLogClass);

	this.prompt.focus();
	});
	}
	}

	_handleConsoleSavedResultAliasSettingChanged()
	{
	this._updateActiveExecutionContextDisplay();
	}

	_handleEngineeringShowInternalExecutionContextsSettingChanged(event)
	{
	this._updateActiveExecutionContextDisplay();

	if (WI.runtimeManager.activeExecutionContext.type !== WI.ExecutionContext.Type.Internal)
	return;

	this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
	this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
	}

	_handleFramePageExecutionContextChanged(event)
	{
	let frame = event.target;

	if (this._restoreSelectedExecutionContextForFrame !== frame)
	return;

	this._restoreSelectedExecutionContextForFrame = null;

	this._useExecutionContextOfInspectedNode = false;
	this._setActiveExecutionContext(frame.pageExecutionContext);
	}

	_handleFrameExecutionContextsCleared(event)
	{
	let {committingProvisionalLoad, contexts} = event.data;

	let hasActiveExecutionContext = contexts.some((context) => context === WI.runtimeManager.activeExecutionContext);
	if (!hasActiveExecutionContext)
	return;

	// If this frame is navigating and it is selected in the UI we want to reselect its new item after navigation.
	if (committingProvisionalLoad && !this._restoreSelectedExecutionContextForFrame) {
	this._restoreSelectedExecutionContextForFrame = event.target;

	// As a fail safe, if the frame never gets an execution context, clear the restore value.
	setTimeout(() => {
	this._restoreSelectedExecutionContextForFrame = null;
	}, 10);
	return;
	}

	this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
	this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
	}

	_handleDebuggerActiveCallFrameDidChange(event)
	{
	this._updateActiveExecutionContextDisplay();
	}

	_handleActiveExecutionContextChanged(event)
	{
	this._updateActiveExecutionContextDisplay();
	}

	_handleTransitionPageTarget()
	{
	this._updateActiveExecutionContextDisplay();
	}

	_handleTargetRemoved(event)
	{
	let {target} = event.data;
	if (target !== WI.runtimeManager.activeExecutionContext)
	return;

	this._useExecutionContextOfInspectedNode = InspectorBackend.hasDomain("DOM");
	this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
	}

	_handleInspectedNodeChanged(event)
	{
	if (!this._useExecutionContextOfInspectedNode)
	return;

	this._setActiveExecutionContext(this._resolveDesiredActiveExecutionContext());
	}

	_toggleOrFocus(event)
	{
	if (this._keyboardShortcutDisabled)
	return;

	if (this.prompt.focused) {
	WI.toggleSplitConsole();
	event.preventDefault();
	} else if (!WI.isEditingAnyField() && !WI.isEventTargetAnEditableField(event)) {
	this.prompt.focus();
	event.preventDefault();
	}
	}

	_updateStyles()
	{
	this.element.classList.toggle("showing-log", WI.isShowingConsoleTab() \|\| WI.isShowingSplitConsole());
	}
	};