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      1 /*
      2  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #ifndef ScriptElement_h
     22 #define ScriptElement_h
     23 
     24 #include "CachedResourceClient.h"
     25 #include "CachedResourceHandle.h"
     26 #include <wtf/text/TextPosition.h>
     27 
     28 namespace WebCore {
     29 
     30 class CachedScript;
     31 class Element;
     32 class ScriptElement;
     33 class ScriptSourceCode;
     34 
     35 class ScriptElement : private CachedResourceClient {
     36     WTF_MAKE_FAST_ALLOCATED;
     37 public:
     38     ScriptElement(Element*, bool createdByParser, bool isEvaluated);
     39     virtual ~ScriptElement();
     40 
     41     Element* element() const { return m_element; }
     42 
     43     enum LegacyTypeSupport { DisallowLegacyTypeInTypeAttribute, AllowLegacyTypeInTypeAttribute };
     44     bool prepareScript(const TextPosition1& scriptStartPosition = TextPosition1::minimumPosition(), LegacyTypeSupport = DisallowLegacyTypeInTypeAttribute);
     45 
     46     String scriptCharset() const { return m_characterEncoding; }
     47     String scriptContent() const;
     48     void executeScript(const ScriptSourceCode&);
     49     void execute(CachedScript*);
     50 
     51     // XML parser calls these
     52     virtual void dispatchLoadEvent() = 0;
     53     virtual void dispatchErrorEvent() = 0;
     54     bool isScriptTypeSupported(LegacyTypeSupport) const;
     55 
     56     bool haveFiredLoadEvent() const { return m_haveFiredLoad; }
     57     bool willBeParserExecuted() const { return m_willBeParserExecuted; }
     58     bool readyToBeParserExecuted() const { return m_readyToBeParserExecuted; }
     59     bool willExecuteWhenDocumentFinishedParsing() const { return m_willExecuteWhenDocumentFinishedParsing; }
     60     CachedResourceHandle<CachedScript> cachedScript() { return m_cachedScript; }
     61 
     62 protected:
     63     void setHaveFiredLoadEvent(bool haveFiredLoad) { m_haveFiredLoad = haveFiredLoad; }
     64     bool isParserInserted() const { return m_parserInserted; }
     65     bool alreadyStarted() const { return m_alreadyStarted; }
     66     bool forceAsync() const { return m_forceAsync; }
     67 
     68     // Helper functions used by our parent classes.
     69     void insertedIntoDocument();
     70     void removedFromDocument();
     71     void childrenChanged();
     72     void handleSourceAttribute(const String& sourceUrl);
     73     void handleAsyncAttribute();
     74 
     75 private:
     76     bool ignoresLoadRequest() const;
     77     bool isScriptForEventSupported() const;
     78 
     79     bool requestScript(const String& sourceUrl);
     80     void stopLoadRequest();
     81 
     82     virtual void notifyFinished(CachedResource*);
     83 
     84     virtual String sourceAttributeValue() const = 0;
     85     virtual String charsetAttributeValue() const = 0;
     86     virtual String typeAttributeValue() const = 0;
     87     virtual String languageAttributeValue() const = 0;
     88     virtual String forAttributeValue() const = 0;
     89     virtual String eventAttributeValue() const = 0;
     90     virtual bool asyncAttributeValue() const = 0;
     91     virtual bool deferAttributeValue() const = 0;
     92     virtual bool hasSourceAttribute() const = 0;
     93 
     94     Element* m_element;
     95     CachedResourceHandle<CachedScript> m_cachedScript;
     96     bool m_parserInserted : 1;
     97     bool m_isExternalScript : 1;
     98     bool m_alreadyStarted : 1;
     99     bool m_haveFiredLoad : 1;
    100     bool m_willBeParserExecuted : 1; // Same as "The parser will handle executing the script."
    101     bool m_readyToBeParserExecuted : 1;
    102     bool m_willExecuteWhenDocumentFinishedParsing : 1;
    103     bool m_forceAsync : 1;
    104     bool m_willExecuteInOrder : 1;
    105     String m_characterEncoding;
    106     String m_fallbackCharacterEncoding;
    107 };
    108 
    109 ScriptElement* toScriptElement(Element*);
    110 
    111 }
    112 
    113 #endif
    114