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/*
* Copyright (C) 2010 Google, 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. ``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
* 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.
*/
#ifndef HTMLScriptRunner_h
#define HTMLScriptRunner_h
#include "CachedResourceClient.h"
#include "CachedResourceHandle.h"
#include <wtf/Noncopyable.h>
#include <wtf/PassRefPtr.h>
namespace WebCore {
class CachedResourceClient;
class CachedScript;
class Document;
class Element;
class Frame;
class HTMLScriptRunnerHost;
class ScriptSourceCode;
class HTMLScriptRunner : public Noncopyable {
public:
HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
~HTMLScriptRunner();
// Processes the passed in script and any pending scripts if possible.
bool execute(PassRefPtr<Element> scriptToProcess, int scriptStartLine);
bool executeScriptsWaitingForLoad(CachedResource*);
bool hasScriptsWaitingForStylesheets() const { return m_hasScriptsWaitingForStylesheets; }
bool executeScriptsWaitingForStylesheets();
bool isExecutingScript() { return !!m_scriptNestingLevel; }
private:
// A container for an external script which may be loaded and executed.
//
// A CachedResourceHandle alone does not prevent the underlying CachedResource
// from purging its data buffer. This class holds a dummy client open for its
// lifetime in order to guarantee that the data buffer will not be purged.
//
// FIXME: Finish turning this into a proper class.
class PendingScript : public CachedResourceClient, Noncopyable {
public:
PendingScript()
: startingLineNumber(0)
, m_watchingForLoad(false)
{
}
~PendingScript();
PassRefPtr<Element> releaseElementAndClear();
bool watchingForLoad() const { return m_watchingForLoad; }
void setWatchingForLoad(bool b) { m_watchingForLoad = b; }
CachedScript* cachedScript() const;
void setCachedScript(CachedScript*);
virtual void notifyFinished(CachedResource*)
{
}
RefPtr<Element> element;
int startingLineNumber; // Only used for inline script tags.
// HTML5 has an isReady parameter, however isReady ends up equivalent to
// m_document->haveStylesheetsLoaded() && cachedScript->isLoaded()
private:
bool m_watchingForLoad;
CachedResourceHandle<CachedScript> m_cachedScript;
};
Frame* frame() const;
bool haveParsingBlockingScript() const;
bool executeParsingBlockingScripts();
void executePendingScript();
void requestScript(Element*);
void runScript(Element*, int startingLineNumber);
// Helpers for dealing with HTMLScriptRunnerHost
void watchForLoad(PendingScript&);
void stopWatchingForLoad(PendingScript&);
void executeScript(Element*, const ScriptSourceCode&);
bool isPendingScriptReady(const PendingScript&);
ScriptSourceCode sourceFromPendingScript(const PendingScript&, bool& errorOccurred);
Document* m_document;
HTMLScriptRunnerHost* m_host;
PendingScript m_parsingBlockingScript;
unsigned m_scriptNestingLevel;
// We only want stylesheet loads to trigger script execution if script
// execution is currently stopped due to stylesheet loads, otherwise we'd
// cause nested script execution when parsing <style> tags since </style>
// tags can cause Document to call executeScriptsWaitingForStylesheets.
bool m_hasScriptsWaitingForStylesheets;
};
}
#endif
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