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pjs/parser/html/nsHtml5Parser.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=2 et tw=79: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
* Henri Sivonen <hsivonen@iki.fi>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsCompatibility.h"
#include "nsScriptLoader.h"
#include "nsNetUtil.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsICharsetAlias.h"
#include "nsIWebShellServices.h"
#include "nsIDocShell.h"
#include "nsEncoderDecoderUtils.h"
#include "nsContentUtils.h"
#include "nsICharsetDetector.h"
#include "nsIScriptElement.h"
#include "nsIMarkupDocumentViewer.h"
#include "nsIDocShellTreeItem.h"
#include "nsIContentViewer.h"
#include "nsIScriptGlobalObjectOwner.h"
#include "nsIScriptSecurityManager.h"
#include "nsHtml5DocumentMode.h"
#include "nsHtml5Tokenizer.h"
#include "nsHtml5UTF16Buffer.h"
#include "nsHtml5TreeBuilder.h"
#include "nsHtml5Parser.h"
#include "nsHtml5AtomTable.h"
NS_INTERFACE_TABLE_HEAD(nsHtml5Parser)
NS_INTERFACE_TABLE2(nsHtml5Parser, nsIParser, nsISupportsWeakReference)
NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsHtml5Parser)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsHtml5Parser)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsHtml5Parser)
NS_IMPL_CYCLE_COLLECTION_CLASS(nsHtml5Parser)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsHtml5Parser)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR_AMBIGUOUS(mExecutor,
nsIContentSink)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR_AMBIGUOUS(mStreamParser,
nsIStreamListener)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsHtml5Parser)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mExecutor)
tmp->DropStreamParser();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
nsHtml5Parser::nsHtml5Parser()
: mFirstBuffer(new nsHtml5UTF16Buffer(0))
, mLastBuffer(mFirstBuffer)
, mExecutor(new nsHtml5TreeOpExecutor())
, mTreeBuilder(new nsHtml5TreeBuilder(mExecutor, nsnull))
, mTokenizer(new nsHtml5Tokenizer(mTreeBuilder))
, mRootContextLineNumber(1)
{
mAtomTable.Init(); // we aren't checking for OOM anyway...
mTokenizer->setInterner(&mAtomTable);
// There's a zeroing operator new for everything else
}
nsHtml5Parser::~nsHtml5Parser()
{
mTokenizer->end();
}
NS_IMETHODIMP_(void)
nsHtml5Parser::SetContentSink(nsIContentSink* aSink)
{
NS_ASSERTION(aSink == static_cast<nsIContentSink*> (mExecutor),
"Attempt to set a foreign sink.");
}
NS_IMETHODIMP_(nsIContentSink*)
nsHtml5Parser::GetContentSink()
{
return static_cast<nsIContentSink*> (mExecutor);
}
NS_IMETHODIMP_(void)
nsHtml5Parser::GetCommand(nsCString& aCommand)
{
aCommand.Assign("view");
}
NS_IMETHODIMP_(void)
nsHtml5Parser::SetCommand(const char* aCommand)
{
NS_ASSERTION(!strcmp(aCommand, "view"), "Parser command was not view");
}
NS_IMETHODIMP_(void)
nsHtml5Parser::SetCommand(eParserCommands aParserCommand)
{
NS_ASSERTION(aParserCommand == eViewNormal,
"Parser command was not eViewNormal.");
}
NS_IMETHODIMP_(void)
nsHtml5Parser::SetDocumentCharset(const nsACString& aCharset,
PRInt32 aCharsetSource)
{
NS_PRECONDITION(!mExecutor->HasStarted(),
"Document charset set too late.");
NS_PRECONDITION(mStreamParser, "Setting charset on a script-only parser.");
mStreamParser->SetDocumentCharset(aCharset, aCharsetSource);
mExecutor->SetDocumentCharsetAndSource((nsACString&)aCharset,
aCharsetSource);
}
NS_IMETHODIMP_(void)
nsHtml5Parser::SetParserFilter(nsIParserFilter* aFilter)
{
NS_ERROR("Attempt to set a parser filter on HTML5 parser.");
}
NS_IMETHODIMP
nsHtml5Parser::GetChannel(nsIChannel** aChannel)
{
if (mStreamParser) {
return mStreamParser->GetChannel(aChannel);
} else {
return NS_ERROR_NOT_AVAILABLE;
}
}
NS_IMETHODIMP
nsHtml5Parser::GetDTD(nsIDTD** aDTD)
{
*aDTD = nsnull;
return NS_OK;
}
NS_IMETHODIMP
nsHtml5Parser::GetStreamListener(nsIStreamListener** aListener)
{
NS_IF_ADDREF(*aListener = mStreamParser);
return NS_OK;
}
NS_IMETHODIMP
nsHtml5Parser::ContinueInterruptedParsing()
{
NS_NOTREACHED("Don't call. For interface compat only.");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP_(void)
nsHtml5Parser::BlockParser()
{
mBlocked = PR_TRUE;
}
NS_IMETHODIMP_(void)
nsHtml5Parser::UnblockParser()
{
mBlocked = PR_FALSE;
}
NS_IMETHODIMP_(PRBool)
nsHtml5Parser::IsParserEnabled()
{
return !mBlocked;
}
NS_IMETHODIMP_(PRBool)
nsHtml5Parser::IsComplete()
{
return mExecutor->IsComplete();
}
NS_IMETHODIMP
nsHtml5Parser::Parse(nsIURI* aURL, // legacy parameter; ignored
nsIRequestObserver* aObserver,
void* aKey,
nsDTDMode aMode) // legacy; ignored
{
/*
* Do NOT cause WillBuildModel to be called synchronously from here!
* The document won't be ready for it until OnStartRequest!
*/
NS_PRECONDITION(!mExecutor->HasStarted(),
"Tried to start parse without initializing the parser.");
NS_PRECONDITION(mStreamParser,
"Can't call this Parse() variant on script-created parser");
mStreamParser->SetObserver(aObserver);
mExecutor->SetStreamParser(mStreamParser);
mExecutor->SetParser(this);
mRootContextKey = aKey;
return NS_OK;
}
NS_IMETHODIMP
nsHtml5Parser::Parse(const nsAString& aSourceBuffer,
void* aKey,
const nsACString& aContentType, // ignored
PRBool aLastCall,
nsDTDMode aMode) // ignored
{
NS_PRECONDITION(!mExecutor->IsFragmentMode(),
"Document.write called in fragment mode!");
// Maintain a reference to ourselves so we don't go away
// till we're completely done. The old parser grips itself in this method.
nsCOMPtr<nsIParser> kungFuDeathGrip(this);
// Gripping the other objects just in case, since the other old grip
// required grips to these, too.
nsRefPtr<nsHtml5StreamParser> streamKungFuDeathGrip(mStreamParser);
nsRefPtr<nsHtml5TreeOpExecutor> treeOpKungFuDeathGrip(mExecutor);
if (!mExecutor->HasStarted()) {
NS_ASSERTION(!mStreamParser,
"Had stream parser but document.write started life cycle.");
// This is the first document.write() on a document.open()ed document
mExecutor->SetParser(this);
mTreeBuilder->setScriptingEnabled(mExecutor->IsScriptEnabled());
mTokenizer->start();
mExecutor->Start();
/*
* If you move the following line, be very careful not to cause
* WillBuildModel to be called before the document has had its
* script global object set.
*/
mExecutor->WillBuildModel(eDTDMode_unknown);
}
// Return early if the parser has processed EOF
if (mExecutor->IsComplete()) {
return NS_OK;
}
if (aLastCall && aSourceBuffer.IsEmpty() && aKey == GetRootContextKey()) {
// document.close()
NS_ASSERTION(!mStreamParser,
"Had stream parser but got document.close().");
mDocumentClosed = PR_TRUE;
if (!mBlocked) {
ParseUntilBlocked();
}
return NS_OK;
}
NS_ASSERTION(IsInsertionPointDefined(),
"Doc.write reached parser with undefined insertion point.");
NS_ASSERTION(!(mStreamParser && !aKey),
"Got a null key in a non-script-created parser");
if (aSourceBuffer.IsEmpty()) {
return NS_OK;
}
nsRefPtr<nsHtml5UTF16Buffer> buffer =
new nsHtml5UTF16Buffer(aSourceBuffer.Length());
memcpy(buffer->getBuffer(),
aSourceBuffer.BeginReading(),
aSourceBuffer.Length() * sizeof(PRUnichar));
buffer->setEnd(aSourceBuffer.Length());
// The buffer is inserted to the stream here in case it won't be parsed
// to completion.
// The script is identified by aKey. If there's nothing in the buffer
// chain for that key, we'll insert at the head of the queue.
// When the script leaves something in the queue, a zero-length
// key-holder "buffer" is inserted in the queue. If the same script
// leaves something in the chain again, it will be inserted immediately
// before the old key holder belonging to the same script.
nsHtml5UTF16Buffer* prevSearchBuf = nsnull;
nsHtml5UTF16Buffer* searchBuf = mFirstBuffer;
// after document.open, the first level of document.write has null key
if (aKey) {
while (searchBuf != mLastBuffer) {
if (searchBuf->key == aKey) {
// found a key holder
// now insert the new buffer between the previous buffer
// and the key holder.
buffer->next = searchBuf;
if (prevSearchBuf) {
prevSearchBuf->next = buffer;
} else {
mFirstBuffer = buffer;
}
break;
}
prevSearchBuf = searchBuf;
searchBuf = searchBuf->next;
}
if (searchBuf == mLastBuffer) {
// key was not found
nsHtml5UTF16Buffer* keyHolder = new nsHtml5UTF16Buffer(aKey);
keyHolder->next = mFirstBuffer;
buffer->next = keyHolder;
mFirstBuffer = buffer;
}
} else {
// we have a first level document.write after document.open()
// insert immediately before mLastBuffer
while (searchBuf != mLastBuffer) {
prevSearchBuf = searchBuf;
searchBuf = searchBuf->next;
}
buffer->next = mLastBuffer;
if (prevSearchBuf) {
prevSearchBuf->next = buffer;
} else {
mFirstBuffer = buffer;
}
}
while (!mBlocked && buffer->hasMore()) {
buffer->adjust(mLastWasCR);
mLastWasCR = PR_FALSE;
if (buffer->hasMore()) {
PRInt32 lineNumberSave;
PRBool inRootContext = (!mStreamParser && (aKey == mRootContextKey));
if (inRootContext) {
mTokenizer->setLineNumber(mRootContextLineNumber);
} else {
// we aren't the root context, so save the line number on the
// *stack* so that we can restore it.
lineNumberSave = mTokenizer->getLineNumber();
}
mLastWasCR = mTokenizer->tokenizeBuffer(buffer);
if (inRootContext) {
mRootContextLineNumber = mTokenizer->getLineNumber();
} else {
mTokenizer->setLineNumber(lineNumberSave);
}
if (mTreeBuilder->HasScript()) {
mTreeBuilder->Flush(); // Move ops to the executor
mExecutor->FlushDocumentWrite(); // run the ops
}
// Ignore suspension requests
}
}
if (!mBlocked) { // buffer was tokenized to completion
NS_ASSERTION(!buffer->hasMore(), "Buffer wasn't tokenized to completion?");
// Scripting semantics require a forced tree builder flush here
mTreeBuilder->Flush(); // Move ops to the executor
mExecutor->FlushDocumentWrite(); // run the ops
}
return NS_OK;
}
/**
* This magic value is passed to the previous method on document.close()
*/
NS_IMETHODIMP_(void *)
nsHtml5Parser::GetRootContextKey()
{
return mRootContextKey;
}
NS_IMETHODIMP
nsHtml5Parser::Terminate()
{
// We should only call DidBuildModel once, so don't do anything if this is
// the second time that Terminate has been called.
if (mExecutor->IsComplete()) {
return NS_OK;
}
// XXX - [ until we figure out a way to break parser-sink circularity ]
// Hack - Hold a reference until we are completely done...
nsCOMPtr<nsIParser> kungFuDeathGrip(this);
nsRefPtr<nsHtml5StreamParser> streamKungFuDeathGrip(mStreamParser);
nsRefPtr<nsHtml5TreeOpExecutor> treeOpKungFuDeathGrip(mExecutor);
if (mStreamParser) {
mStreamParser->Terminate();
}
return mExecutor->DidBuildModel(PR_TRUE);
}
NS_IMETHODIMP
nsHtml5Parser::ParseFragment(const nsAString& aSourceBuffer,
void* aKey,
nsTArray<nsString>& aTagStack,
PRBool aXMLMode,
const nsACString& aContentType,
nsDTDMode aMode)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsHtml5Parser::ParseFragment(const nsAString& aSourceBuffer,
nsIContent* aTargetNode,
nsIAtom* aContextLocalName,
PRInt32 aContextNamespace,
PRBool aQuirks)
{
nsIDocument* doc = aTargetNode->GetOwnerDoc();
NS_ENSURE_TRUE(doc, NS_ERROR_NOT_AVAILABLE);
nsIURI* uri = doc->GetDocumentURI();
NS_ENSURE_TRUE(uri, NS_ERROR_NOT_AVAILABLE);
Initialize(doc, uri, nsnull, nsnull);
mExecutor->SetParser(this);
mExecutor->SetNodeInfoManager(doc->NodeInfoManager());
nsIContent* target = aTargetNode;
mTreeBuilder->setFragmentContext(aContextLocalName,
aContextNamespace,
&target,
aQuirks);
mExecutor->EnableFragmentMode();
NS_PRECONDITION(!mExecutor->HasStarted(),
"Tried to start parse without initializing the parser.");
mTreeBuilder->setScriptingEnabled(mExecutor->IsScriptEnabled());
mTokenizer->start();
mExecutor->Start(); // Don't call WillBuildModel in fragment case
if (!aSourceBuffer.IsEmpty()) {
PRBool lastWasCR = PR_FALSE;
nsHtml5UTF16Buffer buffer(aSourceBuffer.Length());
memcpy(buffer.getBuffer(),
aSourceBuffer.BeginReading(),
aSourceBuffer.Length() * sizeof(PRUnichar));
buffer.setEnd(aSourceBuffer.Length());
while (buffer.hasMore()) {
buffer.adjust(lastWasCR);
lastWasCR = PR_FALSE;
if (buffer.hasMore()) {
lastWasCR = mTokenizer->tokenizeBuffer(&buffer);
}
}
}
mTokenizer->eof();
mTreeBuilder->StreamEnded();
mTreeBuilder->Flush();
mExecutor->FlushDocumentWrite();
mTokenizer->end();
mExecutor->DropParserAndPerfHint();
mExecutor->DropHeldElements();
mAtomTable.Clear();
return NS_OK;
}
NS_IMETHODIMP
nsHtml5Parser::BuildModel()
{
NS_NOTREACHED("Don't call this!");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsHtml5Parser::CancelParsingEvents()
{
NS_NOTREACHED("Don't call this!");
return NS_ERROR_NOT_IMPLEMENTED;
}
void
nsHtml5Parser::Reset()
{
mExecutor->Reset();
mLastWasCR = PR_FALSE;
UnblockParser();
mDocumentClosed = PR_FALSE;
mStreamParser = nsnull;
mRootContextLineNumber = 1;
mParserInsertedScriptsBeingEvaluated = 0;
mRootContextKey = nsnull;
mAtomTable.Clear(); // should be already cleared in the fragment case anyway
// Portable parser objects
mFirstBuffer->next = nsnull;
mFirstBuffer->setStart(0);
mFirstBuffer->setEnd(0);
mLastBuffer = mFirstBuffer;
}
PRBool
nsHtml5Parser::CanInterrupt()
{
// nsContentSink needs this to let nsContentSink::DidProcessATokenImpl
// interrupt.
return PR_TRUE;
}
PRBool
nsHtml5Parser::IsInsertionPointDefined()
{
return !mExecutor->IsFlushing() &&
(!mStreamParser || mParserInsertedScriptsBeingEvaluated);
}
void
nsHtml5Parser::BeginEvaluatingParserInsertedScript()
{
++mParserInsertedScriptsBeingEvaluated;
}
void
nsHtml5Parser::EndEvaluatingParserInsertedScript()
{
--mParserInsertedScriptsBeingEvaluated;
}
void
nsHtml5Parser::MarkAsNotScriptCreated()
{
NS_PRECONDITION(!mStreamParser, "Must not call this twice.");
mStreamParser = new nsHtml5StreamParser(mExecutor, this);
}
PRBool
nsHtml5Parser::IsScriptCreated()
{
return !mStreamParser;
}
/* End nsIParser */
// not from interface
void
nsHtml5Parser::ParseUntilBlocked()
{
NS_PRECONDITION(!mExecutor->IsFragmentMode(),
"ParseUntilBlocked called in fragment mode.");
if (mBlocked) {
return;
}
if (mExecutor->IsComplete()) {
return;
}
NS_ASSERTION(mExecutor->HasStarted(), "Bad life cycle.");
for (;;) {
if (!mFirstBuffer->hasMore()) {
if (mFirstBuffer == mLastBuffer) {
if (mExecutor->IsComplete()) {
// something like cache manisfests stopped the parse in mid-flight
return;
}
if (mDocumentClosed) {
NS_ASSERTION(!mStreamParser,
"This should only happen with script-created parser.");
mTokenizer->eof();
mTreeBuilder->StreamEnded();
mTreeBuilder->Flush();
mExecutor->FlushDocumentWrite();
mTokenizer->end();
return;
}
// never release the last buffer.
NS_ASSERTION(!mLastBuffer->getStart() && !mLastBuffer->getEnd(),
"Sentinel buffer had its indeces changed.");
if (mStreamParser && mReturnToStreamParserPermitted
&& !mExecutor->IsScriptExecuting()) {
mTreeBuilder->Flush();
mReturnToStreamParserPermitted = PR_FALSE;
mStreamParser->ContinueAfterScripts(mTokenizer,
mTreeBuilder,
mLastWasCR);
}
return; // no more data for now but expecting more
}
mFirstBuffer = mFirstBuffer->next;
continue;
}
if (mBlocked || mExecutor->IsComplete()) {
return;
}
// now we have a non-empty buffer
mFirstBuffer->adjust(mLastWasCR);
mLastWasCR = PR_FALSE;
if (mFirstBuffer->hasMore()) {
PRBool inRootContext = (!mStreamParser &&
(mFirstBuffer->key == mRootContextKey));
if (inRootContext) {
mTokenizer->setLineNumber(mRootContextLineNumber);
}
mLastWasCR = mTokenizer->tokenizeBuffer(mFirstBuffer);
if (inRootContext) {
mRootContextLineNumber = mTokenizer->getLineNumber();
}
if (mTreeBuilder->HasScript()) {
mTreeBuilder->Flush();
mExecutor->FlushDocumentWrite();
}
if (mBlocked) {
return;
}
}
continue;
}
}
nsresult
nsHtml5Parser::Initialize(nsIDocument* aDoc,
nsIURI* aURI,
nsISupports* aContainer,
nsIChannel* aChannel)
{
return mExecutor->Init(aDoc, aURI, aContainer, aChannel);
}
void
nsHtml5Parser::StartTokenizer(PRBool aScriptingEnabled) {
mTreeBuilder->setScriptingEnabled(aScriptingEnabled);
mTokenizer->start();
}
void
nsHtml5Parser::InitializeDocWriteParserState(nsAHtml5TreeBuilderState* aState,
PRInt32 aLine)
{
mTokenizer->resetToDataState();
mTokenizer->setLineNumber(aLine);
mTreeBuilder->loadState(aState, &mAtomTable);
mLastWasCR = PR_FALSE;
mReturnToStreamParserPermitted = PR_TRUE;
}
void
nsHtml5Parser::ContinueAfterFailedCharsetSwitch()
{
NS_PRECONDITION(mStreamParser,
"Tried to continue after failed charset switch without a stream parser");
mStreamParser->ContinueAfterFailedCharsetSwitch();
}
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