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      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 "core/dom/PendingScript.h"
     30 #include "wtf/Deque.h"
     31 #include "wtf/PassRefPtr.h"
     32 #include "wtf/text/TextPosition.h"
     33 
     34 namespace WebCore {
     35 
     36 class Resource;
     37 class ScriptResource;
     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:
     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     void execute(PassRefPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
     57 
     58     void executeScriptsWaitingForLoad(Resource*);
     59     bool hasScriptsWaitingForResources() const { return m_hasScriptsWaitingForResources; }
     60     void executeScriptsWaitingForResources();
     61     bool executeScriptsWaitingForParsing();
     62 
     63     bool hasParserBlockingScript() const;
     64     bool isExecutingScript() const { return !!m_scriptNestingLevel; }
     65 
     66 private:
     67     HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
     68 
     69     Frame* frame() const;
     70 
     71     void executeParsingBlockingScript();
     72     void executePendingScriptAndDispatchEvent(PendingScript&);
     73     void executeParsingBlockingScripts();
     74 
     75     void requestParsingBlockingScript(Element*);
     76     void requestDeferredScript(Element*);
     77     bool requestPendingScript(PendingScript&, Element*) const;
     78 
     79     void runScript(Element*, const TextPosition& 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_parserBlockingScript;
     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 executeScriptsWaitingForResources.
     97     bool m_hasScriptsWaitingForResources;
     98 };
     99 
    100 }
    101 
    102 #endif
    103