ef444a9b4f
dann@godzilla.ics.uci.edu, r=heikki, sr=jst git-svn-id: svn://10.0.0.236/trunk@126401 18797224-902f-48f8-a5cc-f745e15eee43
209 lines
7.2 KiB
C++
209 lines
7.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/**
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* MODULE NOTES:
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* @update gess 7/15/98
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*
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* NavDTD is an implementation of the nsIDTD interface.
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* In particular, this class captures the behaviors of the original
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* Navigator parser productions.
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*
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* This DTD, like any other in NGLayout, provides a few basic services:
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* - First, the DTD collaborates with the Parser class to convert plain
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* text into a sequence of HTMLTokens.
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* - Second, the DTD describes containment rules for known elements.
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* - Third the DTD controls and coordinates the interaction between the
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* parsing system and content sink. (The content sink is the interface
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* that serves as a proxy for content model).
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* - Fourth the DTD maintains an internal style-stack to handle residual (leaky)
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* style tags.
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*
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* You're most likely working in this class file because
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* you want to add or change a behavior inherent in this DTD. The remainder
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* of this section will describe what you need to do to affect the kind of
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* change you want in this DTD.
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*
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* RESIDUAL-STYLE HANDLNG:
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* There are a number of ways to represent style in an HTML document.
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* 1) explicit style tags (<B>, <I> etc)
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* 2) implicit styles (like those implicit in <Hn>)
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* 3) CSS based styles
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*
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* Residual style handling results from explicit style tags that are
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* not closed. Consider this example: <p>text <b>bold </p>
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* When the <p> tag closes, the <b> tag is NOT automatically closed.
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* Unclosed style tags are handled by the process we call residual-style
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* tag handling.
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*
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* There are two aspects to residual style tag handling. The first is the
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* construction and managing of a stack of residual style tags. The
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* second is the automatic emission of residual style tags onto leaf content
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* in subsequent portions of the document.This step is necessary to propagate
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* the expected style behavior to subsequent portions of the document.
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*
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* Construction and managing the residual style stack is an inline process that
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* occurs during the model building phase of the parse process. During the model-
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* building phase of the parse process, a content stack is maintained which tracks
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* the open container hierarchy. If a style tag(s) fails to be closed when a normal
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* container is closed, that style tag is placed onto the residual style stack. If
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* that style tag is subsequently closed (in most contexts), it is popped off the
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* residual style stack -- and are of no further concern.
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*
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* Residual style tag emission occurs when the style stack is not empty, and leaf
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* content occurs. In our earlier example, the <b> tag "leaked" out of the <p>
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* container. Just before the next leaf is emitted (in this or another container) the
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* style tags that are on the stack are emitted in succession. These same residual
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* style tags get closed automatically when the leaf's container closes, or if a
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* child container is opened.
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*
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*
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*/
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#ifndef NS_OTHERDTD__
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#define NS_OTHERDTD__
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#include "nsIDTD.h"
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#include "nsISupports.h"
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#include "nsIParser.h"
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#include "nsHTMLTokens.h"
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#include "nsVoidArray.h"
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#include "nsDeque.h"
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#include "nsParserCIID.h"
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#define NS_IOTHERHTML_DTD_IID \
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{0x8a5e89c0, 0xd16d, 0x11d1, \
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{0x80, 0x22, 0x00, 0x60, 0x8, 0x14, 0x98, 0x89}}
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class nsIHTMLContentSink;
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class nsIParserNode;
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class nsParser;
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class nsDTDContext;
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class nsEntryStack;
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class nsITokenizer;
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class nsIParserNode;
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class nsTokenAllocator;
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class nsNodeAllocator;
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/***************************************************************
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Now the main event: COtherDTD.
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This not so simple class performs all the duties of token
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construction and model building. It works in conjunction with
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an nsParser.
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***************************************************************/
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#if defined(XP_PC)
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#pragma warning( disable : 4275 )
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#endif
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class COtherDTD : public nsIDTD
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{
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#if defined(XP_PC)
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#pragma warning( default : 4275 )
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#endif
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIDTD
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/**
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* Common constructor for navdtd. You probably want to call
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* NS_NewNavHTMLDTD().
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*
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* @update gess 7/9/98
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*/
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COtherDTD();
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/**
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* Virtual destructor -- you know what to do
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* @update gess 7/9/98
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*/
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virtual ~COtherDTD();
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/**
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* The following set of methods are used to partially construct
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* the content model (via the sink) according to the type of token.
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* @update gess5/11/98
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* @param aToken is the token (of a given type) to be handled
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* @return error code representing construction state; usually 0.
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*/
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nsresult HandleStartToken(CToken* aToken);
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nsresult HandleEndToken(CToken* aToken);
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nsresult HandleEntityToken(CToken* aToken);
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//*************************************************
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//these cover methods mimic the sink, and are used
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//by the parser to manage its context-stack.
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//*************************************************
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protected:
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nsresult CollectAttributes(nsIParserNode& aNode,eHTMLTags aTag,PRInt32 aCount);
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nsresult WillHandleStartTag(CToken* aToken,eHTMLTags aChildTag,nsIParserNode& aNode);
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nsresult DidHandleStartTag(nsIParserNode& aNode,eHTMLTags aChildTag);
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nsIParserNode* CreateNode(CToken* aToken=nsnull,PRInt32 aLineNumber=1,nsTokenAllocator* aTokenAllocator=0);
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nsIHTMLContentSink* mSink;
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nsDTDContext* mBodyContext;
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PRInt32 mHasOpenHead;
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PRPackedBool mHasOpenForm;
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PRPackedBool mHasOpenMap;
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PRPackedBool mHasOpenBody;
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PRPackedBool mHadFrameset;
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PRPackedBool mHadBody;
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PRPackedBool mHasOpenScript;
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PRPackedBool mEnableStrict;
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nsString mFilename;
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PRInt32 mLineNumber;
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nsParser* mParser;
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nsITokenizer* mTokenizer; // weak
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nsTokenAllocator* mTokenAllocator;
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nsNodeAllocator* mNodeAllocator;
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eHTMLTags mSkipTarget;
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nsresult mDTDState;
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nsDTDMode mDTDMode;
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eParserCommands mParserCommand; //tells us to viewcontent/viewsource/viewerrors...
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PRUint32 mComputedCRC32;
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PRUint32 mExpectedCRC32;
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nsString mScratch; //used for various purposes; non-persistent
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eParserDocType mDocType;
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};
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extern nsresult NS_NewOtherHTMLDTD(nsIDTD** aInstancePtrResult);
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class CTransitionalDTD : public COtherDTD
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{
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public:
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CTransitionalDTD();
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virtual ~CTransitionalDTD();
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};
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#endif //NS_OTHERDTD__
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