/*
* 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 "core/dom/PendingScript.h"
#include "wtf/Deque.h"
#include "wtf/PassRefPtr.h"
#include "wtf/text/TextPosition.h"
namespace WebCore {
class Resource;
class ScriptResource;
class Document;
class Element;
class LocalFrame;
class HTMLScriptRunnerHost;
class ScriptSourceCode;
class HTMLScriptRunner {
WTF_MAKE_NONCOPYABLE(HTMLScriptRunner); WTF_MAKE_FAST_ALLOCATED;
public:
static PassOwnPtr<HTMLScriptRunner> create(Document* document, HTMLScriptRunnerHost* host)
{
return adoptPtr(new HTMLScriptRunner(document, host));
}
~HTMLScriptRunner();
void detach();
// Processes the passed in script and any pending scripts if possible.
void execute(PassRefPtr<Element> scriptToProcess, const TextPosition& scriptStartPosition);
void executeScriptsWaitingForLoad(Resource*);
bool hasScriptsWaitingForResources() const { return m_hasScriptsWaitingForResources; }
void executeScriptsWaitingForResources();
bool executeScriptsWaitingForParsing();
bool hasParserBlockingScript() const;
bool isExecutingScript() const { return !!m_scriptNestingLevel; }
private:
HTMLScriptRunner(Document*, HTMLScriptRunnerHost*);
LocalFrame* frame() const;
enum PendingScriptType {
PendingScriptBlockingParser,
PendingScriptDeferred
};
void executeParsingBlockingScript();
void executePendingScriptAndDispatchEvent(PendingScript&, PendingScriptType);
void executeParsingBlockingScripts();
void requestParsingBlockingScript(Element*);
void requestDeferredScript(Element*);
bool requestPendingScript(PendingScript&, Element*) const;
void runScript(Element*, const TextPosition& scriptStartPosition);
// Helpers for dealing with HTMLScriptRunnerHost
void watchForLoad(PendingScript&);
void stopWatchingForLoad(PendingScript&);
bool isPendingScriptReady(const PendingScript&);
ScriptSourceCode sourceFromPendingScript(const PendingScript&, bool& errorOccurred) const;
Document* m_document;
HTMLScriptRunnerHost* m_host;
PendingScript m_parserBlockingScript;
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
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 executeScriptsWaitingForResources.
bool m_hasScriptsWaitingForResources;
};
}
#endif