1190 lines
40 KiB
C++
1190 lines
40 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=2 ts=2 et tw=78: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Blake Kaplan <mrbkap@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* @file nsHTMLTokenizer.cpp
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* This is an implementation of the nsITokenizer interface.
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* This file contains the implementation of a tokenizer to tokenize an HTML
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* document. It attempts to do so, making tradeoffs between compatibility with
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* older parsers and the SGML specification. Note that most of the real
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* "tokenization" takes place in nsHTMLTokens.cpp.
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*/
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#include "nsIAtom.h"
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#include "nsHTMLTokenizer.h"
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#include "nsScanner.h"
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#include "nsElementTable.h"
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#include "CParserContext.h"
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#include "nsReadableUtils.h"
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#include "nsUnicharUtils.h"
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/************************************************************************
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And now for the main class -- nsHTMLTokenizer...
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************************************************************************/
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/**
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* Satisfy the nsISupports interface.
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*/
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NS_IMPL_ISUPPORTS1(nsHTMLTokenizer, nsITokenizer)
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/**
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* Default constructor
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*
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* @param aParseMode The current mode the document is in (quirks, etc.)
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* @param aDocType The document type of the current document
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* @param aCommand What we are trying to do (view-source, parse a fragment, etc.)
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*/
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nsHTMLTokenizer::nsHTMLTokenizer(PRInt32 aParseMode,
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eParserDocType aDocType,
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eParserCommands aCommand,
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PRUint16 aFlags) :
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nsITokenizer(), mTokenDeque(0), mFlags(aFlags)
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{
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if (aParseMode==eDTDMode_full_standards ||
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aParseMode==eDTDMode_almost_standards) {
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mFlags |= NS_IPARSER_FLAG_STRICT_MODE;
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}
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else if (aParseMode==eDTDMode_quirks) {
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mFlags |= NS_IPARSER_FLAG_QUIRKS_MODE;
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}
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else if (aParseMode==eDTDMode_autodetect) {
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mFlags |= NS_IPARSER_FLAG_AUTO_DETECT_MODE;
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}
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else {
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mFlags |= NS_IPARSER_FLAG_UNKNOWN_MODE;
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}
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if (aDocType==ePlainText) {
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mFlags |= NS_IPARSER_FLAG_PLAIN_TEXT;
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}
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else if (aDocType==eXML) {
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mFlags |= NS_IPARSER_FLAG_XML;
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}
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else if (aDocType==eHTML_Quirks ||
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aDocType==eHTML3_Quirks ||
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aDocType==eHTML_Strict) {
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mFlags |= NS_IPARSER_FLAG_HTML;
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}
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mFlags |= (aCommand==eViewSource)? NS_IPARSER_FLAG_VIEW_SOURCE:NS_IPARSER_FLAG_VIEW_NORMAL;
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NS_ASSERTION(!(mFlags & NS_IPARSER_FLAG_XML) ||
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(mFlags & NS_IPARSER_FLAG_VIEW_SOURCE),
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"Why isn't this XML document going through our XML parser?");
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mTokenAllocator = nsnull;
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mTokenScanPos = 0;
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}
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/**
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* The destructor ensures that we don't leak any left over tokens.
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*/
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nsHTMLTokenizer::~nsHTMLTokenizer()
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{
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if(mTokenDeque.GetSize()){
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CTokenDeallocator theDeallocator(mTokenAllocator->GetArenaPool());
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mTokenDeque.ForEach(theDeallocator);
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}
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}
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/*******************************************************************
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Here begins the real working methods for the tokenizer.
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*******************************************************************/
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/**
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* Adds a token onto the end of the deque if aResult is a successful result.
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* Otherwise, this function frees aToken and sets it to nsnull.
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*
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* @param aToken The token that wants to be added.
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* @param aResult The error code that will be used to determine if we actually
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* want to push this token.
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* @param aDeque The deque we want to push aToken onto.
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* @param aTokenAllocator The allocator we use to free aToken in case aResult
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* is not a success code.
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*/
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/* static */
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void nsHTMLTokenizer::AddToken(CToken*& aToken,
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nsresult aResult,
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nsDeque* aDeque,
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nsTokenAllocator* aTokenAllocator)
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{
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if(aToken && aDeque) {
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if(NS_SUCCEEDED(aResult)) {
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aDeque->Push(aToken);
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}
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else {
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IF_FREE(aToken, aTokenAllocator);
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}
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}
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}
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/**
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* Retrieve a pointer to the global token recycler...
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*
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* @return Pointer to recycler (or null)
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*/
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nsTokenAllocator* nsHTMLTokenizer::GetTokenAllocator(void)
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{
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return mTokenAllocator;
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}
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/**
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* This method provides access to the topmost token in the tokenDeque.
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* The token is not really removed from the list.
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*
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* @return Pointer to token
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*/
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CToken* nsHTMLTokenizer::PeekToken()
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{
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return (CToken*)mTokenDeque.PeekFront();
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}
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/**
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* This method provides access to the topmost token in the tokenDeque.
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* The token is really removed from the list; if the list is empty we return 0.
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*
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* @return Pointer to token or NULL
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*/
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CToken* nsHTMLTokenizer::PopToken()
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{
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CToken* result=nsnull;
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result=(CToken*)mTokenDeque.PopFront();
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return result;
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}
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/**
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* Pushes a token onto the front of our deque such that the next call to
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* PopToken() or PeekToken() will return that token.
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*
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* @param theToken The next token to be processed
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* @return theToken
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*/
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CToken* nsHTMLTokenizer::PushTokenFront(CToken* theToken)
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{
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mTokenDeque.PushFront(theToken);
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return theToken;
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}
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/**
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* Pushes a token onto the deque.
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*
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* @param theToken the new token.
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* @return theToken
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*/
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CToken* nsHTMLTokenizer::PushToken(CToken* theToken)
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{
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mTokenDeque.Push(theToken);
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return theToken;
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}
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/**
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* Returns the size of the deque.
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*
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* @return The number of remaining tokens.
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*/
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PRInt32 nsHTMLTokenizer::GetCount(void)
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{
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return mTokenDeque.GetSize();
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}
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/**
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* Allows access to an arbitrary token in the deque. The accessed token is left
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* in the deque.
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*
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* @param anIndex The index of the target token. Token 0 would be the same as
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* the result of a call to PeekToken()
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* @return The requested token.
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*/
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CToken* nsHTMLTokenizer::GetTokenAt(PRInt32 anIndex)
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{
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return (CToken*)mTokenDeque.ObjectAt(anIndex);
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}
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/**
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* This method is part of the "sandwich" that occurs when we want to tokenize
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* a document. This prepares us to be able to tokenize properly.
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*
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* @param aIsFinalChunk Whether this is the last chunk of data that we will
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* get to see.
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* @param aTokenAllocator The token allocator to use for this document.
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* @return Our success in setting up.
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*/
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nsresult nsHTMLTokenizer::WillTokenize(PRBool aIsFinalChunk,
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nsTokenAllocator* aTokenAllocator)
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{
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mTokenAllocator=aTokenAllocator;
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mIsFinalChunk=aIsFinalChunk;
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// Cause ScanDocStructure to search from here for new tokens...
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mTokenScanPos=mTokenDeque.GetSize();
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return NS_OK;
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}
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/**
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* Pushes all of the tokens in aDeque onto the front of our deque so they
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* get processed before any other tokens.
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*
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* @param aDeque The deque with the tokens in it.
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*/
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void nsHTMLTokenizer::PrependTokens(nsDeque& aDeque)
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{
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PRInt32 aCount=aDeque.GetSize();
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PRInt32 anIndex=0;
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for(anIndex=0;anIndex<aCount;++anIndex){
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CToken* theToken=(CToken*)aDeque.Pop();
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PushTokenFront(theToken);
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}
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}
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/**
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* Copies the state flags from aTokenizer into this tokenizer. This is used
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* to pass information around between the main tokenizer and tokenizers
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* created for document.write() calls.
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*
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* @param aTokenizer The tokenizer with more information in it.
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* @return NS_OK
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*/
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nsresult nsHTMLTokenizer::CopyState(nsITokenizer* aTokenizer)
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{
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if (aTokenizer) {
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mFlags = ((nsHTMLTokenizer*)aTokenizer)->mFlags;
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}
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return NS_OK;
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}
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/**
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* This is a utilty method for ScanDocStructure, which finds a given
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* tag in the stack. The return value is meant to be used with
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* nsDeque::ObjectAt() on aTagStack.
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*
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* @param aTag -- the ID of the tag we're seeking
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* @param aTagStack -- the stack to be searched
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* @return index position of tag in stack if found, otherwise kNotFound
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*/
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static PRInt32 FindLastIndexOfTag(eHTMLTags aTag,nsDeque &aTagStack)
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{
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PRInt32 theCount=aTagStack.GetSize();
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while(0<theCount) {
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CHTMLToken *theToken=(CHTMLToken*)aTagStack.ObjectAt(--theCount);
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if(theToken) {
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eHTMLTags theTag=(eHTMLTags)theToken->GetTypeID();
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if(theTag==aTag) {
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return theCount;
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}
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}
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}
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return kNotFound;
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}
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/**
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* This method scans the sequence of tokens to determine whether or not the
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* tag structure of the document is well formed. In well formed cases, we can
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* skip doing residual style handling and allow inlines to contain block-level
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* elements.
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*
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* @param aFinalChunk Is unused.
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* @return Success (currently, this function cannot fail).
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*/
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nsresult nsHTMLTokenizer::ScanDocStructure(PRBool aFinalChunk)
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{
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nsresult result = NS_OK;
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if (!mTokenDeque.GetSize())
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return result;
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CHTMLToken* theToken = (CHTMLToken*)mTokenDeque.ObjectAt(mTokenScanPos);
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// Start by finding the first start tag that hasn't been reviewed.
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while(mTokenScanPos > 0) {
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if(theToken) {
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eHTMLTokenTypes theType = eHTMLTokenTypes(theToken->GetTokenType());
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if(eToken_start == theType) {
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if(eFormUnknown == theToken->GetContainerInfo()) {
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break;
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}
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}
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}
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theToken = (CHTMLToken*)mTokenDeque.ObjectAt(--mTokenScanPos);
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}
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// Now that we know where to start, let's walk through the
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// tokens to see which are well-formed. Stop when you run out
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// of fresh tokens.
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nsDeque theStack(0);
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nsDeque tempStack(0);
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PRInt32 theStackDepth = 0;
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// Don't bother if we get ridiculously deep.
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static const PRInt32 theMaxStackDepth = 200;
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while(theToken && theStackDepth < theMaxStackDepth) {
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eHTMLTokenTypes theType = eHTMLTokenTypes(theToken->GetTokenType());
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eHTMLTags theTag = (eHTMLTags)theToken->GetTypeID();
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if(nsHTMLElement::IsContainer(theTag)) { // Bug 54117
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PRBool theTagIsBlock = gHTMLElements[theTag].IsMemberOf(kBlockEntity);
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PRBool theTagIsInline = (theTagIsBlock) ?
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PR_FALSE :
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gHTMLElements[theTag].IsMemberOf(kInlineEntity);
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if(theTagIsBlock || theTagIsInline || eHTMLTag_table == theTag) {
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switch(theType) {
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case eToken_start:
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{
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if (gHTMLElements[theTag].ShouldVerifyHierarchy()) {
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PRInt32 earlyPos = FindLastIndexOfTag(theTag, theStack);
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if (earlyPos != kNotFound) {
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// Uh-oh, we've found a tag that is not allowed to nest at
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// all. Mark the previous one and all of its children as
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// malformed to increase our chances of doing RS handling
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// on all of them. We want to do this for cases such as:
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// <a><div><a></a></div></a>.
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// Note that we have to iterate through all of the chilren
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// of the original malformed tag to protect against:
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// <a><font><div><a></a></div></font></a>, so that the <font>
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// is allowed to contain the <div>.
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// XXX What about <a><span><a>, where the second <a> closes
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// the <span>?
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nsDequeIterator it(theStack, earlyPos), end(theStack.End());
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while (it < end) {
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CHTMLToken *theMalformedToken =
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NS_STATIC_CAST(CHTMLToken*, it++);
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theMalformedToken->SetContainerInfo(eMalformed);
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}
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}
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}
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theStack.Push(theToken);
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++theStackDepth;
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}
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break;
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case eToken_end:
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{
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CHTMLToken *theLastToken = NS_STATIC_CAST(CHTMLToken*, theStack.Peek());
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if(theLastToken) {
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if(theTag == theLastToken->GetTypeID()) {
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theStack.Pop(); // Yank it for real
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theStackDepth--;
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theLastToken->SetContainerInfo(eWellFormed);
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}
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else {
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// This token wasn't what we expected it to be! We need to
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// go searching for its real start tag on our stack. Each
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// tag in between the end tag and start tag must be malformed
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if(FindLastIndexOfTag(theTag, theStack) != kNotFound) {
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// Find theTarget in the stack, marking each (malformed!)
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// tag in our way.
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theStack.Pop(); // pop off theLastToken for real.
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do {
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theLastToken->SetContainerInfo(eMalformed);
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tempStack.Push(theLastToken);
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theLastToken = NS_STATIC_CAST(CHTMLToken*, theStack.Pop());
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} while(theLastToken && theTag != theLastToken->GetTypeID());
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// XXX The above test can confuse two different userdefined
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// tags.
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NS_ASSERTION(theLastToken,
|
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"FindLastIndexOfTag lied to us!"
|
|
" We couldn't find theTag on theStack");
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theLastToken->SetContainerInfo(eMalformed);
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|
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// Great, now push all of the other tokens back onto the
|
|
// stack to preserve the general structure of the document.
|
|
// Note that we don't push the target token back onto the
|
|
// the stack (since it was just closed).
|
|
while(tempStack.GetSize() != 0) {
|
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theStack.Push(tempStack.Pop());
|
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}
|
|
} // else ignore a bogus end tag.
|
|
}
|
|
} // if (theLastToken)
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}
|
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break;
|
|
default:
|
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break;
|
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}
|
|
}
|
|
}
|
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|
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theToken = (CHTMLToken*)mTokenDeque.ObjectAt(++mTokenScanPos);
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}
|
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|
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return result;
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}
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|
|
/**
|
|
* This method is called after we're done tokenizing a chunk of data.
|
|
*
|
|
* @param aFinalChunk Tells us if this was the last chunk of data.
|
|
* @return Error result.
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|
*/
|
|
nsresult nsHTMLTokenizer::DidTokenize(PRBool aFinalChunk)
|
|
{
|
|
return ScanDocStructure(aFinalChunk);
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|
}
|
|
|
|
/**
|
|
* This method is repeatedly called by the tokenizer.
|
|
* Each time, we determine the kind of token we're about to
|
|
* read, and then we call the appropriate method to handle
|
|
* that token type.
|
|
*
|
|
* @param aScanner The source of our input.
|
|
* @param aFlushTokens An OUT parameter to tell the caller whether it should
|
|
* process our queued tokens up to now (e.g., when we
|
|
* reach a <script>).
|
|
* @return Success or error
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeToken(nsScanner& aScanner,PRBool& aFlushTokens)
|
|
{
|
|
PRUnichar theChar;
|
|
CToken* theToken=0;
|
|
|
|
nsresult result=aScanner.Peek(theChar);
|
|
|
|
switch(result) {
|
|
case kEOF:
|
|
// Tell our caller that'we finished.
|
|
return result;
|
|
|
|
case NS_OK:
|
|
default:
|
|
|
|
if(!(mFlags & NS_IPARSER_FLAG_PLAIN_TEXT)) {
|
|
if(kLessThan==theChar) {
|
|
return ConsumeTag(theChar,theToken,aScanner,aFlushTokens);
|
|
}
|
|
else if(kAmpersand==theChar){
|
|
return ConsumeEntity(theChar,theToken,aScanner);
|
|
}
|
|
}
|
|
|
|
if((kCR==theChar) || (kLF==theChar)) {
|
|
return ConsumeNewline(theChar,theToken,aScanner);
|
|
}
|
|
else {
|
|
if(!nsCRT::IsAsciiSpace(theChar)) {
|
|
if(theChar!=nsnull) {
|
|
result=ConsumeText(theToken,aScanner);
|
|
}
|
|
else {
|
|
aScanner.GetChar(theChar); // skip the embedded null char. Fix bug 64098.
|
|
}
|
|
break;
|
|
}
|
|
result=ConsumeWhitespace(theChar,theToken,aScanner);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* This method is called just after a "<" has been consumed
|
|
* and we know we're at the start of some kind of tagged
|
|
* element. We don't know yet if it's a tag or a comment.
|
|
*
|
|
* @param aChar is the last char read
|
|
* @param aToken is the out arg holding our new token (the function allocates
|
|
* the return token using mTokenAllocator).
|
|
* @param aScanner represents our input source
|
|
* @param aFlushTokens is an OUT parameter use to tell consumers to flush
|
|
* the current tokens after processing the current one.
|
|
* @return error code.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeTag(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner,
|
|
PRBool& aFlushTokens)
|
|
{
|
|
PRUnichar theNextChar, oldChar;
|
|
nsresult result=aScanner.Peek(aChar,1);
|
|
|
|
if(NS_OK==result) {
|
|
|
|
switch(aChar) {
|
|
case kForwardSlash:
|
|
result=aScanner.Peek(theNextChar, 2);
|
|
|
|
if(NS_OK==result) {
|
|
// Get the original "<" (we've already seen it with a Peek)
|
|
aScanner.GetChar(oldChar);
|
|
|
|
// XML allows non ASCII tag names, consume this as an end tag. This
|
|
// is needed to make XML view source work
|
|
PRBool isXML=(mFlags & NS_IPARSER_FLAG_XML);
|
|
if(nsCRT::IsAsciiAlpha(theNextChar)||(kGreaterThan==theNextChar)||
|
|
(isXML && (! nsCRT::IsAscii(theNextChar)))) {
|
|
result=ConsumeEndTag(aChar,aToken,aScanner);
|
|
}
|
|
else result=ConsumeComment(aChar,aToken,aScanner);
|
|
}
|
|
|
|
break;
|
|
|
|
case kExclamation:
|
|
result=aScanner.Peek(theNextChar, 2);
|
|
|
|
if(NS_OK==result) {
|
|
// Get the original "<" (we've already seen it with a Peek)
|
|
aScanner.GetChar(oldChar);
|
|
|
|
if((kMinus==theNextChar) || (kGreaterThan==theNextChar)) {
|
|
result=ConsumeComment(aChar,aToken,aScanner);
|
|
}
|
|
else
|
|
result=ConsumeSpecialMarkup(aChar,aToken,aScanner);
|
|
}
|
|
break;
|
|
|
|
case kQuestionMark: // It must be an XML processing instruction...
|
|
// Get the original "<" (we've already seen it with a Peek)
|
|
aScanner.GetChar(oldChar);
|
|
result=ConsumeProcessingInstruction(aChar,aToken,aScanner);
|
|
break;
|
|
|
|
default:
|
|
// XML allows non ASCII tag names, consume this as a start tag.
|
|
PRBool isXML=(mFlags & NS_IPARSER_FLAG_XML);
|
|
if(nsCRT::IsAsciiAlpha(aChar) ||
|
|
(isXML && (! nsCRT::IsAscii(aChar)))) {
|
|
// Get the original "<" (we've already seen it with a Peek)
|
|
aScanner.GetChar(oldChar);
|
|
result=ConsumeStartTag(aChar,aToken,aScanner,aFlushTokens);
|
|
}
|
|
else {
|
|
// We are not dealing with a tag. So, don't consume the original
|
|
// char and leave the decision to ConsumeText().
|
|
result=ConsumeText(aToken,aScanner);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Last ditch attempt to make sure we don't lose data.
|
|
if (kEOF == result && !aScanner.IsIncremental()) {
|
|
// Whoops, we don't want to lose any data! Consume the rest as text.
|
|
// This normally happens for either a trailing < or </
|
|
result = ConsumeText(aToken,aScanner);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is called just after we've consumed a start or end
|
|
* tag, and we now have to consume its attributes.
|
|
*
|
|
* @param aChar is the last char read
|
|
* @param aToken is the start or end tag that "owns" these attributes.
|
|
* @param aScanner represents our input source
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeAttributes(PRUnichar aChar,
|
|
CToken* aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
PRBool done=PR_FALSE;
|
|
nsresult result=NS_OK;
|
|
PRInt16 theAttrCount=0;
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
|
|
while((!done) && (result==NS_OK)) {
|
|
CAttributeToken* theToken =
|
|
NS_STATIC_CAST(CAttributeToken*,
|
|
theAllocator->CreateTokenOfType(eToken_attribute,
|
|
eHTMLTag_unknown));
|
|
if(theToken){
|
|
// Tell the new token to finish consuming text...
|
|
result=theToken->Consume(aChar,aScanner,mFlags);
|
|
|
|
// Much as I hate to do this, here's some special case code.
|
|
// This handles the case of empty-tags in XML. Our last
|
|
// attribute token will come through with a text value of ""
|
|
// and a textkey of "/". We should destroy it.
|
|
if(NS_SUCCEEDED(result)) {
|
|
PRBool isUsableAttr = PR_TRUE;
|
|
const nsSubstring& key=theToken->GetKey();
|
|
const nsAString& text=theToken->GetValue();
|
|
|
|
if(!key.IsEmpty() && kForwardSlash==key.First() && text.IsEmpty()) {
|
|
if(!(mFlags & NS_IPARSER_FLAG_VIEW_SOURCE)) {
|
|
// We only care about these in view-source.
|
|
isUsableAttr = PR_FALSE;
|
|
}
|
|
}
|
|
if(isUsableAttr) {
|
|
++theAttrCount;
|
|
AddToken((CToken*&)theToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
else {
|
|
IF_FREE(theToken, mTokenAllocator);
|
|
}
|
|
}
|
|
else {
|
|
IF_FREE(theToken, mTokenAllocator);
|
|
// Bad attributes are not a reason to set empty.
|
|
if(NS_ERROR_HTMLPARSER_BADATTRIBUTE==result) {
|
|
result=NS_OK;
|
|
} else {
|
|
aToken->SetEmpty(PR_TRUE);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if(NS_SUCCEEDED(result)){
|
|
PRInt32 newline = 0;
|
|
result = aScanner.SkipWhitespace(newline);
|
|
NS_ASSERTION(newline == 0, "CAttribute::Consume() failed to collect all the newlines!");
|
|
}
|
|
#endif
|
|
if (NS_SUCCEEDED(result)) {
|
|
result = aScanner.Peek(aChar);
|
|
if (NS_SUCCEEDED(result)) {
|
|
if (aChar == kGreaterThan) { // You just ate the '>'
|
|
aScanner.GetChar(aChar); // Skip the '>'
|
|
done = PR_TRUE;
|
|
}
|
|
else if(aChar == kLessThan) {
|
|
aToken->SetInError(PR_TRUE);
|
|
done = PR_TRUE;
|
|
}
|
|
}
|
|
}
|
|
} // End while
|
|
|
|
if (NS_FAILED(result)) {
|
|
aToken->SetInError(PR_TRUE);
|
|
|
|
if (!aScanner.IsIncremental()) {
|
|
result = NS_OK;
|
|
}
|
|
}
|
|
|
|
aToken->SetAttributeCount(theAttrCount);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method consumes a start tag and all of its attributes.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token. (allocated
|
|
* by the function using mTokenAllocator
|
|
* @param aScanner Our source of data
|
|
* @param aFlushTokens is an OUT parameter use to tell consumers to flush
|
|
* the current tokens after processing the current one.
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeStartTag(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner,
|
|
PRBool& aFlushTokens)
|
|
{
|
|
// Remember this for later in case you have to unwind...
|
|
PRInt32 theDequeSize=mTokenDeque.GetSize();
|
|
nsresult result=NS_OK;
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
aToken=theAllocator->CreateTokenOfType(eToken_start,eHTMLTag_unknown);
|
|
|
|
if(aToken) {
|
|
// Tell the new token to finish consuming text...
|
|
result= aToken->Consume(aChar,aScanner,mFlags);
|
|
|
|
if(NS_SUCCEEDED(result)) {
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
|
|
eHTMLTags theTag=(eHTMLTags)aToken->GetTypeID();
|
|
|
|
// Good. Now, let's see if the next char is ">".
|
|
// If so, we have a complete tag, otherwise, we have attributes.
|
|
result = aScanner.Peek(aChar);
|
|
if (NS_FAILED(result)) {
|
|
aToken->SetInError(PR_TRUE);
|
|
|
|
// Don't return early here so we can create a text and end token for
|
|
// the special <iframe>, <script> and similar tags down below.
|
|
result = NS_OK;
|
|
}
|
|
else {
|
|
if(kGreaterThan != aChar) { // Look for a '>'
|
|
result = ConsumeAttributes(aChar, aToken, aScanner);
|
|
}
|
|
else {
|
|
aScanner.GetChar(aChar);
|
|
}
|
|
}
|
|
|
|
/* Now that that's over with, we have one more problem to solve.
|
|
In the case that we just read a <SCRIPT> or <STYLE> tags, we should go and
|
|
consume all the content itself.
|
|
But XML doesn't treat these tags differently, so we shouldn't if the
|
|
document is XML.
|
|
*/
|
|
if(NS_SUCCEEDED(result) && !(mFlags & NS_IPARSER_FLAG_XML)) {
|
|
PRBool isCDATA = gHTMLElements[theTag].CanContainType(kCDATA);
|
|
PRBool isPCDATA = eHTMLTag_textarea == theTag ||
|
|
eHTMLTag_title == theTag;
|
|
|
|
// XXX This is an evil hack, we should be able to handle these properly
|
|
// in the DTD.
|
|
if ((eHTMLTag_iframe == theTag && (mFlags & NS_IPARSER_FLAG_FRAMES_ENABLED)) ||
|
|
(eHTMLTag_noframes == theTag && (mFlags & NS_IPARSER_FLAG_FRAMES_ENABLED)) ||
|
|
(eHTMLTag_noscript == theTag && (mFlags & NS_IPARSER_FLAG_SCRIPT_ENABLED)) ||
|
|
(eHTMLTag_noembed == theTag)) {
|
|
isCDATA = PR_TRUE;
|
|
}
|
|
|
|
// Plaintext contains CDATA, but it's special, so we handle it
|
|
// differently than the other CDATA elements
|
|
if (eHTMLTag_plaintext == theTag) {
|
|
isCDATA = PR_FALSE;
|
|
|
|
// Note: We check in ConsumeToken() for this flag, and if we see it
|
|
// we only construct text tokens (which is what we want).
|
|
mFlags |= NS_IPARSER_FLAG_PLAIN_TEXT;
|
|
}
|
|
|
|
|
|
if (isCDATA || isPCDATA) {
|
|
PRBool done = PR_FALSE;
|
|
nsDependentString endTagName(nsHTMLTags::GetStringValue(theTag));
|
|
|
|
CToken* text =
|
|
theAllocator->CreateTokenOfType(eToken_text,eHTMLTag_text);
|
|
CTextToken* textToken = NS_STATIC_CAST(CTextToken*,text);
|
|
|
|
if (isCDATA) {
|
|
// The only tags that consume conservatively are <script> and
|
|
// <style>, the rest all consume until the end of the document.
|
|
result = textToken->ConsumeCharacterData(theTag==eHTMLTag_script ||
|
|
theTag==eHTMLTag_style,
|
|
theTag!=eHTMLTag_script,
|
|
aScanner,
|
|
endTagName,
|
|
mFlags,
|
|
done);
|
|
|
|
// Only flush tokens for <script>, to give ourselves more of a
|
|
// chance of allowing inlines to contain blocks.
|
|
aFlushTokens = done && theTag == eHTMLTag_script;
|
|
}
|
|
else if (isPCDATA) {
|
|
// Title is consumed conservatively in order to not regress
|
|
// bug 42945
|
|
result = textToken->ConsumeParsedCharacterData(
|
|
theTag==eHTMLTag_textarea,
|
|
theTag==eHTMLTag_title,
|
|
aScanner,
|
|
endTagName,
|
|
mFlags,
|
|
done);
|
|
|
|
// Note: we *don't* set aFlushTokens here.
|
|
}
|
|
|
|
// We want to do this unless result is kEOF, in which case we will
|
|
// simply unwind our stack and wait for more data anyway.
|
|
if (kEOF != result) {
|
|
AddToken(text,NS_OK,&mTokenDeque,theAllocator);
|
|
CToken* endToken = nsnull;
|
|
|
|
if (NS_SUCCEEDED(result) && done) {
|
|
PRUnichar theChar;
|
|
// Get the <
|
|
result = aScanner.GetChar(theChar);
|
|
NS_ASSERTION(NS_SUCCEEDED(result) && theChar == kLessThan,
|
|
"CTextToken::Consume*Data is broken!");
|
|
#ifdef DEBUG
|
|
// Ensure we have a /
|
|
PRUnichar tempChar; // Don't change non-debug vars in debug-only code
|
|
result = aScanner.Peek(tempChar);
|
|
NS_ASSERTION(NS_SUCCEEDED(result) && tempChar == kForwardSlash,
|
|
"CTextToken::Consume*Data is broken!");
|
|
#endif
|
|
result = ConsumeEndTag(PRUnichar('/'),endToken,aScanner);
|
|
} else if (result == kFakeEndTag &&
|
|
!(mFlags & NS_IPARSER_FLAG_VIEW_SOURCE)) {
|
|
result = NS_OK;
|
|
endToken=theAllocator->CreateTokenOfType(eToken_end,theTag,endTagName);
|
|
AddToken(endToken,result,&mTokenDeque,theAllocator);
|
|
} else if (result == kFakeEndTag) {
|
|
// If we are here, we are both faking having seen the end tag
|
|
// and are in view-source.
|
|
result = NS_OK;
|
|
}
|
|
}
|
|
else {
|
|
IF_FREE(text, mTokenAllocator);
|
|
}
|
|
}
|
|
}
|
|
|
|
// This code is confusing, so pay attention.
|
|
// If you're here, it's because we were in the midst of consuming a start
|
|
// tag but ran out of data (not in the stream, but in this *part* of the
|
|
// stream. For simplicity, we have to unwind our input. Therefore, we pop
|
|
// and discard any new tokens we've cued this round. Later we can get
|
|
// smarter about this.
|
|
if(NS_FAILED(result)) {
|
|
while(mTokenDeque.GetSize()>theDequeSize) {
|
|
CToken* theToken=(CToken*)mTokenDeque.Pop();
|
|
IF_FREE(theToken, mTokenAllocator);
|
|
}
|
|
}
|
|
}
|
|
else IF_FREE(aToken, mTokenAllocator);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method consumes an end tag and any "attributes" that may come after it.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeEndTag(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
// Get the "/" (we've already seen it with a Peek)
|
|
aScanner.GetChar(aChar);
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
aToken=theAllocator->CreateTokenOfType(eToken_end,eHTMLTag_unknown);
|
|
// Remember this for later in case you have to unwind...
|
|
PRInt32 theDequeSize=mTokenDeque.GetSize();
|
|
nsresult result=NS_OK;
|
|
|
|
if(aToken) {
|
|
// Tell the new token to finish consuming text...
|
|
result= aToken->Consume(aChar,aScanner,mFlags);
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
if (NS_FAILED(result)) {
|
|
// Note that this early-return here is safe because we have not yet
|
|
// added any of our tokens to the queue (AddToken only adds the token if
|
|
// result is a success), so we don't need to fall through.
|
|
return result;
|
|
}
|
|
|
|
result = aScanner.Peek(aChar);
|
|
if (NS_FAILED(result)) {
|
|
aToken->SetInError(PR_TRUE);
|
|
|
|
// Note: We know here that the scanner is not incremental since if
|
|
// this peek fails, then we've already masked over a kEOF coming from
|
|
// the Consume() call above.
|
|
return NS_OK;
|
|
}
|
|
|
|
if(kGreaterThan != aChar) {
|
|
result = ConsumeAttributes(aChar, aToken, aScanner);
|
|
}
|
|
else {
|
|
aScanner.GetChar(aChar);
|
|
}
|
|
|
|
// Do the same thing as we do in ConsumeStartTag. Basically, if we've run
|
|
// out of room in this *section* of the document, pop all of the tokens
|
|
// we've consumed this round and wait for more data.
|
|
if(NS_FAILED(result)) {
|
|
while(mTokenDeque.GetSize()>theDequeSize) {
|
|
CToken* theToken=(CToken*)mTokenDeque.Pop();
|
|
IF_FREE(theToken, mTokenAllocator);
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is called just after a "&" has been consumed
|
|
* and we know we're at the start of an entity.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeEntity(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
PRUnichar theChar;
|
|
nsresult result=aScanner.Peek(theChar, 1);
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
if (NS_SUCCEEDED(result)) {
|
|
if (nsCRT::IsAsciiAlpha(theChar) || theChar==kHashsign) {
|
|
aToken = theAllocator->CreateTokenOfType(eToken_entity,eHTMLTag_entity);
|
|
result=aToken->Consume(theChar,aScanner,mFlags);
|
|
|
|
if (result == NS_HTMLTOKENS_NOT_AN_ENTITY) {
|
|
IF_FREE(aToken, mTokenAllocator);
|
|
}
|
|
else {
|
|
if (!aScanner.IsIncremental() && result == kEOF) {
|
|
result=NS_OK; // Use as much of the entity as you can get.
|
|
}
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
return result;
|
|
}
|
|
}
|
|
// Oops, we're actually looking at plain text...
|
|
result = ConsumeText(aToken,aScanner);
|
|
}
|
|
else if (result == kEOF && !aScanner.IsIncremental()) {
|
|
// If the last character in the file is an &, consume it as text.
|
|
result = ConsumeText(aToken, aScanner);
|
|
if (aToken) {
|
|
aToken->SetInError(PR_TRUE);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* This method is called just after whitespace has been
|
|
* consumed and we know we're at the start a whitespace run.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeWhitespace(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
// Get the whitespace character
|
|
aScanner.GetChar(aChar);
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
aToken = theAllocator->CreateTokenOfType(eToken_whitespace,eHTMLTag_whitespace);
|
|
nsresult result=NS_OK;
|
|
if(aToken) {
|
|
result=aToken->Consume(aChar,aScanner,mFlags);
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is called just after a "<!" has been consumed
|
|
* and we know we're at the start of a comment.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeComment(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
// Get the "!"
|
|
aScanner.GetChar(aChar);
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
aToken = theAllocator->CreateTokenOfType(eToken_comment,eHTMLTag_comment);
|
|
nsresult result=NS_OK;
|
|
if(aToken) {
|
|
result=aToken->Consume(aChar,aScanner,mFlags);
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
|
|
if (kNotAComment == result) {
|
|
// AddToken has IF_FREE()'d our token, so...
|
|
result = ConsumeText(aToken, aScanner);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is called just after a known text char has
|
|
* been consumed and we should read a text run. Note: we actually ignore the
|
|
* first character of the text run so that we can consume invalid markup
|
|
* as text.
|
|
*
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeText(CToken*& aToken,nsScanner& aScanner)
|
|
{
|
|
nsresult result=NS_OK;
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
CTextToken* theToken = (CTextToken*)theAllocator->CreateTokenOfType(eToken_text,eHTMLTag_text);
|
|
if(theToken) {
|
|
PRUnichar ch=0;
|
|
result=theToken->Consume(ch,aScanner,mFlags);
|
|
if(NS_FAILED(result)) {
|
|
if(0==theToken->GetTextLength()){
|
|
IF_FREE(aToken, mTokenAllocator);
|
|
aToken = nsnull;
|
|
}
|
|
else result=NS_OK;
|
|
}
|
|
aToken = theToken;
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is called just after a "<!" has been consumed.
|
|
* NOTE: Here we might consume DOCTYPE and "special" markups.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeSpecialMarkup(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
// Get the "!"
|
|
aScanner.GetChar(aChar);
|
|
|
|
nsresult result=NS_OK;
|
|
nsAutoString theBufCopy;
|
|
aScanner.Peek(theBufCopy, 20);
|
|
ToUpperCase(theBufCopy);
|
|
PRInt32 theIndex=theBufCopy.Find("DOCTYPE");
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
|
|
if(theIndex==kNotFound) {
|
|
if('['==theBufCopy.CharAt(0)) {
|
|
aToken = theAllocator->CreateTokenOfType(eToken_cdatasection,eHTMLTag_comment);
|
|
} else if (StringBeginsWith(theBufCopy, NS_LITERAL_STRING("ELEMENT")) ||
|
|
StringBeginsWith(theBufCopy, NS_LITERAL_STRING("ATTLIST")) ||
|
|
StringBeginsWith(theBufCopy, NS_LITERAL_STRING("ENTITY")) ||
|
|
StringBeginsWith(theBufCopy, NS_LITERAL_STRING("NOTATION"))) {
|
|
aToken = theAllocator->CreateTokenOfType(eToken_markupDecl,eHTMLTag_markupDecl);
|
|
} else {
|
|
aToken = theAllocator->CreateTokenOfType(eToken_comment,eHTMLTag_comment);
|
|
}
|
|
}
|
|
else
|
|
aToken = theAllocator->CreateTokenOfType(eToken_doctypeDecl,eHTMLTag_doctypeDecl);
|
|
|
|
if(aToken) {
|
|
result=aToken->Consume(aChar,aScanner,mFlags);
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
|
|
if (result == kNotAComment) {
|
|
result = ConsumeText(aToken, aScanner);
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is called just after a newline has been consumed.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeNewline(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
// Get the newline character
|
|
aScanner.GetChar(aChar);
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
aToken=theAllocator->CreateTokenOfType(eToken_newline,eHTMLTag_newline);
|
|
nsresult result=NS_OK;
|
|
if(aToken) {
|
|
result=aToken->Consume(aChar,aScanner,mFlags);
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* This method is called just after a <? has been consumed.
|
|
*
|
|
* @param aChar The last character read from the scanner.
|
|
* @param aToken The OUT parameter that holds our resulting token.
|
|
* @param aScanner Our source of data
|
|
* @return Error result.
|
|
*/
|
|
nsresult nsHTMLTokenizer::ConsumeProcessingInstruction(PRUnichar aChar,
|
|
CToken*& aToken,
|
|
nsScanner& aScanner)
|
|
{
|
|
// Get the "?"
|
|
aScanner.GetChar(aChar);
|
|
|
|
nsTokenAllocator* theAllocator=this->GetTokenAllocator();
|
|
aToken=theAllocator->CreateTokenOfType(eToken_instruction,eHTMLTag_unknown);
|
|
nsresult result=NS_OK;
|
|
if(aToken) {
|
|
result=aToken->Consume(aChar,aScanner,mFlags);
|
|
AddToken(aToken,result,&mTokenDeque,theAllocator);
|
|
}
|
|
return result;
|
|
}
|