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pjs/htmlparser/src/nsHTMLTokenizer.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
/**
* MODULE NOTES:
* @update gess 4/1/98
*
*/
#include "nsHTMLTokenizer.h"
#include "nsParser.h"
#include "nsScanner.h"
#include "nsElementTable.h"
#include "nsHTMLEntities.h"
/************************************************************************
And now for the main class -- nsHTMLTokenizer...
************************************************************************/
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kITokenizerIID, NS_ITOKENIZER_IID);
static NS_DEFINE_IID(kClassIID, NS_HTMLTOKENIZER_IID);
/**
* This method gets called as part of our COM-like interfaces.
* Its purpose is to create an interface to parser object
* of some type.
*
* @update gess 4/8/98
* @param nsIID id of object to discover
* @param aInstancePtr ptr to newly discovered interface
* @return NS_xxx result code
*/
nsresult nsHTMLTokenizer::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if(aIID.Equals(kISupportsIID)) { //do IUnknown...
*aInstancePtr = (nsIDTD*)(this);
}
else if(aIID.Equals(kITokenizerIID)) { //do IParser base class...
*aInstancePtr = (nsIDTD*)(this);
}
else if(aIID.Equals(kClassIID)) { //do this class...
*aInstancePtr = (nsHTMLTokenizer*)(this);
}
else {
*aInstancePtr=0;
return NS_NOINTERFACE;
}
NS_ADDREF_THIS();
return NS_OK;
}
static CTokenRecycler* gTokenRecycler=0;
void
nsHTMLTokenizer::FreeTokenRecycler(void) {
if(gTokenRecycler) {
delete gTokenRecycler;
gTokenRecycler=0;
}
}
/**
* This method is defined in nsIParser. It is used to
* cause the COM-like construction of an nsParser.
*
* @update gess 4/8/98
* @param nsIParser** ptr to newly instantiated parser
* @return NS_xxx error result
*/
NS_HTMLPARS nsresult NS_NewHTMLTokenizer(nsIDTD** aInstancePtrResult) {
nsHTMLTokenizer* it = new nsHTMLTokenizer();
if (it == 0) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kClassIID, (void **) aInstancePtrResult);
}
NS_IMPL_ADDREF(nsHTMLTokenizer)
NS_IMPL_RELEASE(nsHTMLTokenizer)
/**
* Default constructor
*
* @update gess 4/9/98
* @param
* @return
*/
nsHTMLTokenizer::nsHTMLTokenizer(PRInt32 aParseMode,PRBool aPlainText) :
nsITokenizer(), mTokenDeque(0), mParseMode(aParseMode)
{
NS_INIT_REFCNT();
mDoXMLEmptyTags=PR_FALSE;
mPlainText=aPlainText;
}
/**
* Destructor
*
* @update gess 4/9/98
* @param
* @return
*/
nsHTMLTokenizer::~nsHTMLTokenizer(){
if(mTokenDeque.GetSize()){
CTokenDeallocator theDeallocator;
mTokenDeque.ForEach(theDeallocator);
}
}
/*******************************************************************
Here begins the real working methods for the tokenizer.
*******************************************************************/
void nsHTMLTokenizer::AddToken(CToken*& aToken,nsresult aResult,nsDeque& aDeque,CTokenRecycler* aRecycler) {
if(aToken) {
if(NS_SUCCEEDED(aResult)) {
aDeque.Push(aToken);
}
else {
if(aRecycler) {
aRecycler->RecycleToken(aToken);
}
else delete aToken;
aToken=0;
}
}
}
/**
* Retrieve a ptr to the global token recycler...
* @update gess8/4/98
* @return ptr to recycler (or null)
*/
nsITokenRecycler* nsHTMLTokenizer::GetTokenRecycler(void) {
//let's move to this once we eliminate the leaking of tokens...
if(!gTokenRecycler)
gTokenRecycler=new CTokenRecycler();
return gTokenRecycler;
}
/**
* This method provides access to the topmost token in the tokenDeque.
* The token is not really removed from the list.
* @update gess8/2/98
* @return ptr to token
*/
CToken* nsHTMLTokenizer::PeekToken() {
return (CToken*)mTokenDeque.PeekFront();
}
/**
* This method provides access to the topmost token in the tokenDeque.
* The token is really removed from the list; if the list is empty we return 0.
* @update gess8/2/98
* @return ptr to token or NULL
*/
CToken* nsHTMLTokenizer::PopToken() {
CToken* result=nsnull;
result=(CToken*)mTokenDeque.PopFront();
if(result) result->mUseCount=0;
return result;
}
/**
*
* @update gess8/2/98
* @param
* @return
*/
CToken* nsHTMLTokenizer::PushTokenFront(CToken* theToken) {
mTokenDeque.PushFront(theToken);
theToken->mUseCount=1;
return theToken;
}
/**
*
* @update gess8/2/98
* @param
* @return
*/
CToken* nsHTMLTokenizer::PushToken(CToken* theToken) {
mTokenDeque.Push(theToken);
theToken->mUseCount=1;
return theToken;
}
/**
*
* @update gess12/29/98
* @param
* @return
*/
PRInt32 nsHTMLTokenizer::GetCount(void) {
return mTokenDeque.GetSize();
}
/**
*
* @update gess12/29/98
* @param
* @return
*/
CToken* nsHTMLTokenizer::GetTokenAt(PRInt32 anIndex){
return (CToken*)mTokenDeque.ObjectAt(anIndex);
}
nsresult nsHTMLTokenizer::WillTokenize(PRBool aIsFinalChunk)
{
return NS_OK;
}
/**
*
* @update gess12/29/98
* @param
* @return
*/
void nsHTMLTokenizer::PrependTokens(nsDeque& aDeque){
PRInt32 aCount=aDeque.GetSize();
//last but not least, let's check the misplaced content list.
//if we find it, then we have to push it all into the body before continuing...
PRInt32 anIndex=0;
for(anIndex=0;anIndex<aCount;anIndex++){
CToken* theToken=(CToken*)aDeque.Pop();
PushTokenFront(theToken);
}
}
nsresult nsHTMLTokenizer::DidTokenize(PRBool aIsFinalChunk)
{
return NS_OK;
}
/**
* This method repeatedly called by the tokenizer.
* Each time, we determine the kind of token were about to
* read, and then we call the appropriate method to handle
* that token type.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param anErrorCode: arg that will hold error condition
* @return new token or null
*/
nsresult nsHTMLTokenizer::ConsumeToken(nsScanner& aScanner) {
PRUnichar theChar;
CToken* theToken=0;
nsresult result=aScanner.GetChar(theChar);
switch(result) {
case kEOF:
//We convert from eof to complete here, because we never really tried to get data.
//All we did was try to see if data was available, which it wasn't.
//It's important to return process complete, so that controlling logic can know that
//everything went well, but we're done with token processing.
return result;
case NS_OK:
default:
if(!mPlainText) {
if(kLessThan==theChar) {
return ConsumeTag(theChar,theToken,aScanner);
}
else if(kAmpersand==theChar){
return ConsumeEntity(theChar,theToken,aScanner);
}
}
if((kCR==theChar) || (kLF==theChar)) {
return ConsumeNewline(theChar,theToken,aScanner);
}
else {
if(!nsString::IsSpace(theChar)) {
nsAutoString temp(theChar);
result=ConsumeText(temp,theToken,aScanner);
break;
}
result=ConsumeWhitespace(theChar,theToken,aScanner);
}
break;
} //switch
return NS_OK;
}
/**
* 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.
*
* @update gess 5/12/98
* @param aChar is the last char read
* @param aScanner is represents our input source
* @param aToken is the out arg holding our new token
* @return error code.
*/
nsresult nsHTMLTokenizer::ConsumeTag(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner) {
nsresult result=aScanner.GetChar(aChar);
if(NS_OK==result) {
switch(aChar) {
case kForwardSlash:
PRUnichar ch;
result=aScanner.Peek(ch);
if(NS_OK==result) {
if(nsString::IsAlpha(ch)||(kGreaterThan==ch)) {
result=ConsumeEndTag(aChar,aToken,aScanner);
}
else result=ConsumeComment(aChar,aToken,aScanner);
}//if
break;
case kExclamation:
PRUnichar theNextChar;
result=aScanner.Peek(theNextChar);
if(NS_OK==result) {
if(theNextChar==kMinus)
result=ConsumeComment(aChar,aToken,aScanner);
else
result=ConsumeSpecialMarkup(aChar,aToken,aScanner);
}
break;
case kQuestionMark: //it must be an XML processing instruction...
result=ConsumeProcessingInstruction(aChar,aToken,aScanner);
break;
default:
if(nsString::IsAlpha(aChar))
result=ConsumeStartTag(aChar,aToken,aScanner);
else if(kEOF!=aChar) {
// We are not dealing with a tag. So, put back the char
// and leave the decision to ConsumeText().
aScanner.PutBack(aChar);
nsAutoString temp("<");
result=ConsumeText(temp,aToken,aScanner);
}
} //switch
} //if
return result;
}
/**
* This method is called just after we've consumed a start
* tag, and we now have to consume its attributes.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @return
*/
nsresult nsHTMLTokenizer::ConsumeAttributes(PRUnichar aChar,CStartToken* aToken,nsScanner& aScanner) {
PRBool done=PR_FALSE;
nsresult result=NS_OK;
PRInt16 theAttrCount=0;
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
while((!done) && (result==NS_OK)) {
CToken* theToken= (CAttributeToken*)theRecycler->CreateTokenOfType(eToken_attribute,eHTMLTag_unknown);
if(theToken){
result=theToken->Consume(aChar,aScanner,mParseMode); //tell new token to finish consuming text...
//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, and tell the
//start token it was empty.
if(NS_SUCCEEDED(result)) {
nsString& key=((CAttributeToken*)theToken)->GetKey();
nsString& text=theToken->GetStringValueXXX();
if((mDoXMLEmptyTags) && (kForwardSlash==key.CharAt(0)) && (0==text.Length())){
//tada! our special case! Treat it like an empty start tag...
aToken->SetEmpty(PR_TRUE);
theRecycler->RecycleToken(theToken);
}
else {
theAttrCount++;
AddToken(theToken,result,mTokenDeque,theRecycler);
}
}
else { //if(NS_ERROR_HTMLPARSER_BADATTRIBUTE==result){
aToken->SetEmpty(PR_TRUE);
theRecycler->RecycleToken(theToken);
if(NS_ERROR_HTMLPARSER_BADATTRIBUTE==result)
result=NS_OK;
}
}//if
if(NS_SUCCEEDED(result)){
result=aScanner.SkipWhitespace();
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) {
eHTMLTags theEndTag = (eHTMLTags)aToken->GetTypeID();
if(result==NS_OK&&(gHTMLElements[theEndTag].mSkipTarget)){
CToken* theEndToken=theRecycler->CreateTokenOfType(eToken_end,theEndTag);
AddToken(theEndToken,NS_OK,mTokenDeque,theRecycler);
}
done=PR_TRUE;
}
}//if
}
}//if
}//while
aToken->SetAttributeCount(theAttrCount);
return result;
}
/**
* In the case that we just read the given tag, we should go and
* consume all the input until we find a matching end tag.
* @update gess12/28/98
* @param
* @return
*/
nsresult nsHTMLTokenizer::ConsumeScriptContent(nsScanner& aScanner,CToken*& aToken) {
nsresult result=NS_OK;
return result;
}
/**
*
* @update gess12/28/98
* @param
* @return
*/
nsresult nsHTMLTokenizer::ConsumeStartTag(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner) {
PRInt32 theDequeSize=mTokenDeque.GetSize(); //remember this for later in case you have to unwind...
nsresult result=NS_OK;
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken=theRecycler->CreateTokenOfType(eToken_start,eHTMLTag_unknown);
if(aToken) {
result= aToken->Consume(aChar,aScanner,mParseMode); //tell new token to finish consuming text...
if(NS_SUCCEEDED(result)) {
AddToken(aToken,result,mTokenDeque,theRecycler);
eHTMLTags theTag=(eHTMLTags)aToken->GetTypeID();
if(((CStartToken*)aToken)->IsAttributed()) {
result=ConsumeAttributes(aChar,(CStartToken*)aToken,aScanner);
}
/* 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.
*/
if(NS_SUCCEEDED(result)) {
RecordTrailingContent((CStartToken*)aToken,aScanner);
if((eHTMLTag_style==theTag) || (eHTMLTag_script==theTag)) {
nsAutoString endTag(nsHTMLTags::GetStringValue(theTag));
endTag.Insert("</",0,2);
CToken* textToken=theRecycler->CreateTokenOfType(eToken_text,theTag);
result=((CTextToken*)textToken)->ConsumeUntil(0,PR_TRUE,aScanner,endTag,mParseMode); //tell new token to finish consuming text...
//endTag.Append(">");
CToken* endToken=theRecycler->CreateTokenOfType(eToken_end,theTag,endTag);
AddToken(textToken,result,mTokenDeque,theRecycler);
AddToken(endToken,result,mTokenDeque,theRecycler);
}
}
//EEEEECCCCKKKK!!!
//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_SUCCEEDED(result)) {
while(mTokenDeque.GetSize()>theDequeSize) {
theRecycler->RecycleToken((CToken*)mTokenDeque.Pop());
}
}
} //if
else theRecycler->RecycleToken(aToken);
} //if
return result;
}
/**
*
* @update gess12/28/98
* @param
* @return
*/
nsresult nsHTMLTokenizer::ConsumeEndTag(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner) {
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken=theRecycler->CreateTokenOfType(eToken_end,eHTMLTag_unknown);
nsresult result=NS_OK;
if(aToken) {
result= aToken->Consume(aChar,aScanner,mParseMode); //tell new token to finish consuming text...
AddToken(aToken,result,mTokenDeque,theRecycler);
} //if
return result;
}
/**
* This method is called just after a "&" has been consumed
* and we know we're at the start of an entity.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param anErrorCode: arg that will hold error condition
* @return new token or null
*/
nsresult nsHTMLTokenizer::ConsumeEntity(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner) {
PRUnichar theChar;
nsresult result=aScanner.GetChar(theChar);
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
if(NS_OK==result) {
if(nsString::IsAlpha(theChar)) { //handle common enity references &xxx; or &#000.
aToken = theRecycler->CreateTokenOfType(eToken_entity,eHTMLTag_entity);
result = aToken->Consume(theChar,aScanner,mParseMode); //tell new token to finish consuming text...
}
else if(kHashsign==theChar) {
aToken = theRecycler->CreateTokenOfType(eToken_entity,eHTMLTag_entity);
result=aToken->Consume(theChar,aScanner,mParseMode);
}
else {
//oops, we're actually looking at plain text...
nsAutoString temp("&");
aScanner.PutBack(theChar);
return ConsumeText(temp,aToken,aScanner);
}//if
if(aToken){
nsString& theStr=aToken->GetStringValueXXX();
if((kHashsign!=theChar) && (-1==nsHTMLEntities::EntityToUnicode(theStr))){
//if you're here we have a bogus entity.
//convert it into a text token.
nsAutoString temp("&");
temp.Append(theStr);
CToken* theToken=theRecycler->CreateTokenOfType(eToken_text,eHTMLTag_text,temp);
theRecycler->RecycleToken(aToken);
aToken=theToken;
}
AddToken(aToken,result,mTokenDeque,theRecycler);
}
}//if
return result;
}
/**
* This method is called just after whitespace has been
* consumed and we know we're at the start a whitespace run.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param anErrorCode: arg that will hold error condition
* @return new token or null
*/
nsresult nsHTMLTokenizer::ConsumeWhitespace(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner) {
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken = theRecycler->CreateTokenOfType(eToken_whitespace,eHTMLTag_whitespace);
nsresult result=NS_OK;
if(aToken) {
result=aToken->Consume(aChar,aScanner,mParseMode);
AddToken(aToken,result,mTokenDeque,theRecycler);
}
return result;
}
/**
* This method is called just after a "<!" has been consumed
* and we know we're at the start of a comment.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param anErrorCode: arg that will hold error condition
* @return new token or null
*/
nsresult nsHTMLTokenizer::ConsumeComment(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner){
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken = theRecycler->CreateTokenOfType(eToken_comment,eHTMLTag_comment);
nsresult result=NS_OK;
if(aToken) {
result=aToken->Consume(aChar,aScanner,mParseMode);
AddToken(aToken,result,mTokenDeque,theRecycler);
}
return result;
}
/**
* This method is called just after a known text char has
* been consumed and we should read a text run.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param anErrorCode: arg that will hold error condition
* @return new token or null
*/
nsresult nsHTMLTokenizer::ConsumeText(const nsString& aString,CToken*& aToken,nsScanner& aScanner){
nsresult result=NS_OK;
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken=theRecycler->CreateTokenOfType(eToken_text,eHTMLTag_text,aString);
if(aToken) {
PRUnichar ch=0;
result=aToken->Consume(ch,aScanner,mParseMode);
if(!NS_SUCCEEDED(result)) {
nsString& temp=aToken->GetStringValueXXX();
if(0==temp.Length()){
theRecycler->RecycleToken(aToken);
aToken = nsnull;
}
else result=NS_OK;
}
AddToken(aToken,result,mTokenDeque,theRecycler);
}
return result;
}
/**
* This method is called just after a "<!" has been consumed.
* NOTE: Here we might consume DOCTYPE and "special" markups.
*
*
* @update harishd 09/02/99
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param anErrorCode: arg that will hold error condition
* @return new token or null
*/
nsresult nsHTMLTokenizer::ConsumeSpecialMarkup(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner){
nsresult result=NS_OK;
nsAutoString theBufCopy;
nsString& theBuffer=aScanner.GetBuffer();
theBuffer.Mid(theBufCopy,aScanner.GetOffset(),20);
theBufCopy.ToUpperCase();
PRInt32 theIndex=theBufCopy.Find("DOCTYPE");
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
if(theIndex==kNotFound)
aToken = theRecycler->CreateTokenOfType(eToken_comment,eHTMLTag_comment);
else
aToken = theRecycler->CreateTokenOfType(eToken_doctypeDecl,eHTMLTag_markupDecl);
if(aToken) {
result=aToken->Consume(aChar,aScanner,mParseMode);
AddToken(aToken,result,mTokenDeque,theRecycler);
}
return result;
}
/**
* This method is called just after a newline has been consumed.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param aToken is the newly created newline token that is parsing
* @return error code
*/
nsresult nsHTMLTokenizer::ConsumeNewline(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner){
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken=theRecycler->CreateTokenOfType(eToken_newline,eHTMLTag_newline);
nsresult result=NS_OK;
if(aToken) {
result=aToken->Consume(aChar,aScanner,mParseMode);
AddToken(aToken,result,mTokenDeque,theRecycler);
}
return result;
}
/**
* This method is called just after a ? has been consumed.
*
* @update gess 3/25/98
* @param aChar: last char read
* @param aScanner: see nsScanner.h
* @param aToken is the newly created newline token that is parsing
* @return error code
*/
nsresult nsHTMLTokenizer::ConsumeProcessingInstruction(PRUnichar aChar,CToken*& aToken,nsScanner& aScanner){
CTokenRecycler* theRecycler=(CTokenRecycler*)GetTokenRecycler();
aToken=theRecycler->CreateTokenOfType(eToken_instruction,eHTMLTag_unknown);
nsresult result=NS_OK;
if(aToken) {
result=aToken->Consume(aChar,aScanner,mParseMode);
AddToken(aToken,result,mTokenDeque,theRecycler);
}
return result;
}
/**
* This method keeps a copy of contents within the start token.
* The stored content could later be used in displaying TEXTAREA,
* and also in view source.
*
* @update harishd 11/09/99
* @param aStartToken: The token whose trailing contents are to be recorded
* @param aScanner: see nsScanner.h
*
*/
void nsHTMLTokenizer::RecordTrailingContent(CStartToken* aStartToken, nsScanner& aScanner) {
if(aStartToken) {
PRInt32 theOrigin =aStartToken->mOrigin;
PRInt32 theCurrOffset =aScanner.GetOffset();
PRInt32 theLength =(theCurrOffset>theOrigin)? theCurrOffset-theOrigin:-1;
if(theLength>0) {
nsString& theRawXXX =aStartToken->mTrailingContent;
const PRUnichar* theBuff =(aScanner.GetBuffer()).GetUnicode();
theRawXXX.Append(&theBuff[theOrigin],theLength);
}
}
}
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