1/* 2 * Copyright (C) 2010 Google, Inc. All Rights Reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef HTMLScriptRunner_h 27#define HTMLScriptRunner_h 28 29#include "PendingScript.h" 30#include <wtf/Deque.h> 31#include <wtf/text/TextPosition.h> 32 33namespace WebCore { 34 35class CachedResource; 36class CachedScript; 37class Document; 38class Element; 39class Frame; 40class HTMLScriptRunnerHost; 41class ScriptSourceCode; 42 43class HTMLScriptRunner { 44 WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED; 45public: 46 HTMLScriptRunner(Document&, HTMLScriptRunnerHost&); 47 ~HTMLScriptRunner(); 48 49 void detach(); 50 51 // Processes the passed in script and any pending scripts if possible. 52 void execute(PassRefPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition); 53 54 void executeScriptsWaitingForLoad(CachedResource*); 55 bool hasScriptsWaitingForStylesheets() const { return m_hasScriptsWaitingForStylesheets; } 56 void executeScriptsWaitingForStylesheets(); 57 bool executeScriptsWaitingForParsing(); 58 59 bool hasParserBlockingScript() const; 60 bool isExecutingScript() const { return !!m_scriptNestingLevel; } 61 62private: 63 Frame* frame() const; 64 65 void executeParsingBlockingScript(); 66 void executePendingScriptAndDispatchEvent(PendingScript&); 67 void executeParsingBlockingScripts(); 68 69 void requestParsingBlockingScript(Element*); 70 void requestDeferredScript(Element*); 71 bool requestPendingScript(PendingScript&, Element*) const; 72 73 void runScript(Element*, const TextPosition& scriptStartPosition); 74 75 // Helpers for dealing with HTMLScriptRunnerHost 76 void watchForLoad(PendingScript&); 77 void stopWatchingForLoad(PendingScript&); 78 bool isPendingScriptReady(const PendingScript&); 79 ScriptSourceCode sourceFromPendingScript(const PendingScript&, bool& errorOccurred) const; 80 81 Document* m_document; 82 HTMLScriptRunnerHost& m_host; 83 PendingScript m_parserBlockingScript; 84 Deque<PendingScript> m_scriptsToExecuteAfterParsing; // http://www.whatwg.org/specs/web-apps/current-work/#list-of-scripts-that-will-execute-when-the-document-has-finished-parsing 85 unsigned m_scriptNestingLevel; 86 87 // We only want stylesheet loads to trigger script execution if script 88 // execution is currently stopped due to stylesheet loads, otherwise we'd 89 // cause nested script execution when parsing <style> tags since </style> 90 // tags can cause Document to call executeScriptsWaitingForStylesheets. 91 bool m_hasScriptsWaitingForStylesheets; 92}; 93 94} 95 96#endif 97