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/*
* Copyright (C) 2010 Google, Inc. All Rights Reserved.
* Copyright (C) 2010-2017 Apple 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 "HTMLScriptRunner.h"
#include "Element.h"
#include "Event.h"
#include "EventNames.h"
#include "Frame.h"
#include "HTMLInputStream.h"
#include "HTMLNames.h"
#include "HTMLScriptRunnerHost.h"
#include "IgnoreDestructiveWriteCountIncrementer.h"
#include "InlineClassicScript.h"
#include "Microtasks.h"
#include "MutationObserver.h"
#include "NestingLevelIncrementer.h"
#include "ScriptElement.h"
#include "ScriptSourceCode.h"
namespace WebCore {
using namespace HTMLNames;
HTMLScriptRunner::HTMLScriptRunner(Document& document, HTMLScriptRunnerHost& host)
: m_document(&document)
, m_host(host)
, m_scriptNestingLevel(0)
, m_hasScriptsWaitingForStylesheets(false)
{
}
HTMLScriptRunner::~HTMLScriptRunner()
{
// FIXME: Should we be passed a "done loading/parsing" callback sooner than destruction?
if (m_parserBlockingScript) {
if (m_parserBlockingScript->watchingForLoad())
stopWatchingForLoad(*m_parserBlockingScript);
}
while (!m_scriptsToExecuteAfterParsing.isEmpty()) {
auto pendingScript = m_scriptsToExecuteAfterParsing.takeFirst();
if (pendingScript->watchingForLoad())
stopWatchingForLoad(pendingScript);
}
}
void HTMLScriptRunner::detach()
{
m_document = nullptr;
}
static URL documentURLForScriptExecution(Document* document)
{
if (!document || !document->frame())
return URL();
// Use the URL of the currently active document for this frame.
return document->frame()->document()->url();
}
inline Ref<Event> createScriptLoadEvent()
{
return Event::create(eventNames().loadEvent, false, false);
}
bool HTMLScriptRunner::isPendingScriptReady(const PendingScript& script)
{
if (!m_document)
return false;
m_hasScriptsWaitingForStylesheets = !m_document->haveStylesheetsLoaded();
if (m_hasScriptsWaitingForStylesheets)
return false;
if (script.needsLoading() && !script.isLoaded())
return false;
return true;
}
void HTMLScriptRunner::executePendingScriptAndDispatchEvent(PendingScript& pendingScript)
{
// Stop watching loads before executeScript to prevent recursion if the script reloads itself.
if (pendingScript.watchingForLoad())
stopWatchingForLoad(pendingScript);
if (!isExecutingScript())
MicrotaskQueue::mainThreadQueue().performMicrotaskCheckpoint();
{
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
pendingScript.element().executePendingScript(pendingScript);
}
ASSERT(!isExecutingScript());
}
void HTMLScriptRunner::watchForLoad(PendingScript& pendingScript)
{
ASSERT(!pendingScript.watchingForLoad());
m_host.watchForLoad(pendingScript);
}
void HTMLScriptRunner::stopWatchingForLoad(PendingScript& pendingScript)
{
ASSERT(pendingScript.watchingForLoad());
m_host.stopWatchingForLoad(pendingScript);
}
// This function should match 10.2.5.11 "An end tag whose tag name is 'script'"
// Script handling lives outside the tree builder to keep the each class simple.
void HTMLScriptRunner::execute(Ref<ScriptElement>&& element, const TextPosition& scriptStartPosition)
{
// FIXME: If scripting is disabled, always just return.
bool hadPreloadScanner = m_host.hasPreloadScanner();
// Try to execute the script given to us.
runScript(element.get(), scriptStartPosition);
if (hasParserBlockingScript()) {
if (isExecutingScript())
return; // Unwind to the outermost HTMLScriptRunner::execute before continuing parsing.
// If preload scanner got created, it is missing the source after the current insertion point. Append it and scan.
if (!hadPreloadScanner && m_host.hasPreloadScanner())
m_host.appendCurrentInputStreamToPreloadScannerAndScan();
executeParsingBlockingScripts();
}
}
bool HTMLScriptRunner::hasParserBlockingScript() const
{
return !!m_parserBlockingScript;
}
void HTMLScriptRunner::executeParsingBlockingScripts()
{
while (hasParserBlockingScript() && isPendingScriptReady(*m_parserBlockingScript)) {
ASSERT(m_document);
ASSERT(!isExecutingScript());
ASSERT(m_document->haveStylesheetsLoaded());
InsertionPointRecord insertionPointRecord(m_host.inputStream());
executePendingScriptAndDispatchEvent(m_parserBlockingScript.releaseNonNull().get());
}
}
void HTMLScriptRunner::executeScriptsWaitingForLoad(PendingScript& pendingScript)
{
ASSERT(!isExecutingScript());
ASSERT(hasParserBlockingScript());
ASSERT_UNUSED(pendingScript, m_parserBlockingScript.get() == &pendingScript);
ASSERT(m_parserBlockingScript->isLoaded());
executeParsingBlockingScripts();
}
void HTMLScriptRunner::executeScriptsWaitingForStylesheets()
{
ASSERT(m_document);
// Callers should check hasScriptsWaitingForStylesheets() before calling
// to prevent parser or script re-entry during </style> parsing.
ASSERT(hasScriptsWaitingForStylesheets());
ASSERT(!isExecutingScript());
ASSERT(m_document->haveStylesheetsLoaded());
executeParsingBlockingScripts();
}
bool HTMLScriptRunner::executeScriptsWaitingForParsing()
{
while (!m_scriptsToExecuteAfterParsing.isEmpty()) {
ASSERT(!isExecutingScript());
ASSERT(!hasParserBlockingScript());
ASSERT(m_scriptsToExecuteAfterParsing.first()->needsLoading());
if (!m_scriptsToExecuteAfterParsing.first()->isLoaded()) {
watchForLoad(m_scriptsToExecuteAfterParsing.first());
return false;
}
executePendingScriptAndDispatchEvent(m_scriptsToExecuteAfterParsing.takeFirst().get());
// FIXME: What is this m_document check for?
if (!m_document)
return false;
}
return true;
}
static Ref<PendingScript> requestPendingScript(ScriptElement& scriptElement)
{
ASSERT(scriptElement.willBeParserExecuted());
ASSERT(scriptElement.loadableScript());
return PendingScript::create(scriptElement, *scriptElement.loadableScript());
}
void HTMLScriptRunner::requestParsingBlockingScript(ScriptElement& scriptElement)
{
ASSERT(!m_parserBlockingScript);
m_parserBlockingScript = requestPendingScript(scriptElement);
ASSERT(m_parserBlockingScript->needsLoading());
// We only care about a load callback if LoadableScript is not already
// in the cache. Callers will attempt to run the m_parserBlockingScript
// if possible before returning control to the parser.
if (!m_parserBlockingScript->isLoaded())
watchForLoad(*m_parserBlockingScript);
}
void HTMLScriptRunner::requestDeferredScript(ScriptElement& scriptElement)
{
auto pendingScript = requestPendingScript(scriptElement);
ASSERT(pendingScript->needsLoading());
m_scriptsToExecuteAfterParsing.append(WTFMove(pendingScript));
}
// This method is meant to match the HTML5 definition of "running a script"
// http://www.whatwg.org/specs/web-apps/current-work/multipage/scripting-1.html#running-a-script
void HTMLScriptRunner::runScript(ScriptElement& scriptElement, const TextPosition& scriptStartPosition)
{
ASSERT(m_document);
ASSERT(!hasParserBlockingScript());
// FIXME: This may be too agressive as we always deliver mutations at
// every script element, even if it's not ready to execute yet. There's
// unfortunately no obvious way to tell if prepareScript is going to
// execute the script before calling it.
if (!isExecutingScript())
MicrotaskQueue::mainThreadQueue().performMicrotaskCheckpoint();
InsertionPointRecord insertionPointRecord(m_host.inputStream());
NestingLevelIncrementer nestingLevelIncrementer(m_scriptNestingLevel);
scriptElement.prepareScript(scriptStartPosition);
if (!scriptElement.willBeParserExecuted())
return;
if (scriptElement.willExecuteWhenDocumentFinishedParsing())
requestDeferredScript(scriptElement);
else if (scriptElement.readyToBeParserExecuted()) {
if (m_scriptNestingLevel == 1)
m_parserBlockingScript = PendingScript::create(scriptElement, scriptStartPosition);
else
scriptElement.executeClassicScript(ScriptSourceCode(scriptElement.element().textContent(), documentURLForScriptExecution(m_document), scriptStartPosition, JSC::SourceProviderSourceType::Program, InlineClassicScript::create(scriptElement)));
} else
requestParsingBlockingScript(scriptElement);
}
}