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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.
*/
#include "config.h"
#include "HTML5Tokenizer.h"
#include "Element.h"
#include "Frame.h"
#include "HTML5Lexer.h"
#include "HTML5ScriptRunner.h"
#include "HTML5TreeBuilder.h"
#include "HTMLDocument.h"
#include "Node.h"
#include "NotImplemented.h"
namespace WebCore {
HTML5Tokenizer::HTML5Tokenizer(HTMLDocument* document, bool reportErrors)
: Tokenizer()
, m_document(document)
, m_lexer(new HTML5Lexer)
, m_scriptRunner(new HTML5ScriptRunner(document, this))
, m_treeBuilder(new HTML5TreeBuilder(m_lexer.get(), document, reportErrors))
, m_wasWaitingOnScriptsDuringFinish(false)
{
begin();
}
HTML5Tokenizer::~HTML5Tokenizer()
{
}
void HTML5Tokenizer::begin()
{
}
void HTML5Tokenizer::pumpLexer()
{
ASSERT(!m_treeBuilder->isPaused());
while (m_lexer->nextToken(m_source, m_token)) {
m_treeBuilder->constructTreeFromToken(m_token);
m_token.clear();
if (!m_treeBuilder->isPaused())
continue;
// The parser will pause itself when waiting on a script to load or run.
// ScriptRunner executes scripts at the right times and handles reentrancy.
bool shouldContinueParsing = m_scriptRunner->execute(m_treeBuilder->takeScriptToProcess());
m_treeBuilder->setPaused(!shouldContinueParsing);
if (!shouldContinueParsing)
return;
}
}
void HTML5Tokenizer::write(const SegmentedString& source, bool)
{
// HTML5Tokenizer::executeScript is responsible for handling saving m_source before re-entry.
m_source.append(source);
if (!m_treeBuilder->isPaused())
pumpLexer();
}
void HTML5Tokenizer::end()
{
m_source.close();
if (!m_treeBuilder->isPaused())
pumpLexer();
m_treeBuilder->finished();
}
void HTML5Tokenizer::finish()
{
// finish() indicates we will not receive any more data. If we are waiting on
// an external script to load, we can't finish parsing quite yet.
if (isWaitingForScripts()) {
// FIXME: We might want to use real state enum instead of a bool here.
m_wasWaitingOnScriptsDuringFinish = true;
return;
}
// We can't call m_source.close() yet as we may have a <script> execution
// pending which will call document.write(). No more data off the network though.
end();
}
int HTML5Tokenizer::executingScript() const
{
return m_scriptRunner->inScriptExecution();
}
bool HTML5Tokenizer::isWaitingForScripts() const
{
return m_treeBuilder->isPaused();
}
void HTML5Tokenizer::resumeParsingAfterScriptExecution()
{
ASSERT(!m_scriptRunner->inScriptExecution());
ASSERT(!m_treeBuilder->isPaused());
pumpLexer();
ASSERT(m_treeBuilder->isPaused() || m_source.isEmpty());
if (m_source.isEmpty() && m_wasWaitingOnScriptsDuringFinish)
end(); // The document already finished parsing we were just waiting on scripts when finished() was called.
}
void HTML5Tokenizer::watchForLoad(CachedResource* cachedScript)
{
ASSERT(!cachedScript->isLoaded());
// addClient would call notifyFinished if the load were complete.
// Callers do not expect to be re-entered from this call, so they should
// not an already-loaded CachedResource.
cachedScript->addClient(this);
}
void HTML5Tokenizer::stopWatchingForLoad(CachedResource* cachedScript)
{
cachedScript->removeClient(this);
}
void HTML5Tokenizer::executeScript(const ScriptSourceCode& sourceCode)
{
ASSERT(m_scriptRunner->inScriptExecution());
if (!m_document->frame())
return;
SegmentedString oldInsertionPoint = m_source;
m_source = SegmentedString();
m_document->frame()->script()->executeScript(sourceCode);
// Append oldInsertionPoint onto the new (likely empty) m_source instead of
// oldInsertionPoint.prepent(m_source) as that would ASSERT if
// m_source.escaped() (it had characters pushed back onto it).
m_source.append(oldInsertionPoint);
}
void HTML5Tokenizer::notifyFinished(CachedResource* cachedResource)
{
ASSERT(!m_scriptRunner->inScriptExecution());
ASSERT(m_treeBuilder->isPaused());
bool shouldContinueParsing = m_scriptRunner->executeScriptsWaitingForLoad(cachedResource);
m_treeBuilder->setPaused(!shouldContinueParsing);
if (shouldContinueParsing)
resumeParsingAfterScriptExecution();
}
void HTML5Tokenizer::executeScriptsWaitingForStylesheets()
{
// Ignore calls unless we have a script blocking the parser waiting on a
// stylesheet load. Otherwise we are currently parsing and this
// is a re-entrant call from encountering a </ style> tag.
if (!m_scriptRunner->hasScriptsWaitingForStylesheets())
return;
ASSERT(!m_scriptRunner->inScriptExecution());
ASSERT(m_treeBuilder->isPaused());
bool shouldContinueParsing = m_scriptRunner->executeScriptsWaitingForStylesheets();
m_treeBuilder->setPaused(!shouldContinueParsing);
if (shouldContinueParsing)
resumeParsingAfterScriptExecution();
}
}
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