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 #include <wtf/PassRefPtr.h> 33 34 namespace WebCore { 35 36 class CachedResource; 37 class CachedScript; 38 class Document; 39 class Element; 40 class Frame; 41 class HTMLScriptRunnerHost; 42 class ScriptSourceCode; 43 44 class HTMLScriptRunner { 45 WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED; 46 public: create(Document * document,HTMLScriptRunnerHost * host)47 static PassOwnPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host) 48 { 49 return adoptPtr(new HTMLScriptRunner(document, host)); 50 } 51 ~HTMLScriptRunner(); 52 53 void detach(); 54 55 // Processes the passed in script and any pending scripts if possible. 56 bool execute(PassRefPtr<Element> scriptToProcess, const TextPosition1& scriptStartPosition); 57 58 bool executeScriptsWaitingForLoad(CachedResource*); hasScriptsWaitingForStylesheets()59 bool hasScriptsWaitingForStylesheets() const { return m_hasScriptsWaitingForStylesheets; } 60 bool executeScriptsWaitingForStylesheets(); 61 bool executeScriptsWaitingForParsing(); 62 isExecutingScript()63 bool isExecutingScript() const { return !!m_scriptNestingLevel; } 64 65 private: 66 HTMLScriptRunner(Document*, HTMLScriptRunnerHost*); 67 68 Frame* frame() const; 69 70 void executeParsingBlockingScript(); 71 void executePendingScriptAndDispatchEvent(PendingScript&); 72 bool haveParsingBlockingScript() const; 73 bool executeParsingBlockingScripts(); 74 75 void requestParsingBlockingScript(Element*); 76 void requestDeferredScript(Element*); 77 bool requestPendingScript(PendingScript&, Element*) const; 78 79 void runScript(Element*, const TextPosition1& scriptStartPosition); 80 81 // Helpers for dealing with HTMLScriptRunnerHost 82 void watchForLoad(PendingScript&); 83 void stopWatchingForLoad(PendingScript&); 84 bool isPendingScriptReady(const PendingScript&); 85 ScriptSourceCode sourceFromPendingScript(const PendingScript&, bool& errorOccurred) const; 86 87 Document* m_document; 88 HTMLScriptRunnerHost* m_host; 89 PendingScript m_parsingBlockingScript; 90 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 91 unsigned m_scriptNestingLevel; 92 93 // We only want stylesheet loads to trigger script execution if script 94 // execution is currently stopped due to stylesheet loads, otherwise we'd 95 // cause nested script execution when parsing <style> tags since </style> 96 // tags can cause Document to call executeScriptsWaitingForStylesheets. 97 bool m_hasScriptsWaitingForStylesheets; 98 }; 99 100 } 101 102 #endif 103