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240 lines
8.1 KiB
C++
240 lines
8.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 Communicator client 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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*
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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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#ifndef nsIHTMLContentSink_h___
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#define nsIHTMLContentSink_h___
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/**
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* This file declares the concrete HTMLContentSink class.
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* This class is used during the parsing process as the
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* primary interface between the parser and the content
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* model.
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*
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* After the tokenizer completes, the parser iterates over
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* the known token list. As the parser identifies valid
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* elements, it calls the contentsink interface to notify
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* the content model that a new node or child node is being
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* created and added to the content model.
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*
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* The HTMLContentSink interface assumes 4 underlying
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* containers: HTML, HEAD, BODY and FRAMESET. Before
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* accessing any these, the parser will call the appropriate
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* OpennsIHTMLContentSink method: OpenHTML,OpenHead,OpenBody,OpenFrameSet;
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* likewise, the ClosensIHTMLContentSink version will be called when the
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* parser is done with a given section.
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*
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* IMPORTANT: The parser may Open each container more than
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* once! This is due to the irregular nature of HTML files.
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* For example, it is possible to encounter plain text at
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* the start of an HTML document (that precedes the HTML tag).
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* Such text is treated as if it were part of the body.
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* In such cases, the parser will Open the body, pass the text-
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* node in and then Close the body. The body will likely be
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* re-Opened later when the actual <BODY> tag has been seen.
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*
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* Containers within the body are Opened and Closed
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* using the OpenContainer(...) and CloseContainer(...) calls.
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* It is assumed that the document or contentSink is
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* maintaining its state to manage where new content should
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* be added to the underlying document.
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*
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* NOTE: OpenHTML() and OpenBody() may get called multiple times
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* in the same document. That's fine, and it doesn't mean
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* that we have multiple bodies or HTML's.
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*
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* NOTE: I haven't figured out how sub-documents (non-frames)
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* are going to be handled. Stay tuned.
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*/
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#include "nsIParserNode.h"
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#include "nsIContentSink.h"
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#include "nsHTMLTags.h"
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// d19e6730-5e2f-4131-89db-8a918515097d
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#define NS_IHTML_CONTENT_SINK_IID \
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{ 0xd19e6730, 0x5e2f, 0x4131, \
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{ 0x89, 0xdb, 0x8a, 0x91, 0x85, 0x15, 0x09, 0x7d } }
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#define MAX_REFLOW_DEPTH 200
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class nsIHTMLContentSink : public nsIContentSink
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IHTML_CONTENT_SINK_IID)
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/**
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* This method is used to open the HEAD container. It is useful if a tag
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* is forcing us to open the head (probably again), like if we find a <meta>
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* tag in the body.
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*/
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NS_IMETHOD OpenHead() = 0;
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/**
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* This gets called when handling illegal contents, especially
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* in dealing with tables. This method creates a new context.
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*
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* @update 04/04/99 harishd
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* @param aPosition - The position from where the new context begins.
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*/
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NS_IMETHOD BeginContext(PRInt32 aPosition) = 0;
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/**
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* This method terminates any new context that got created by
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* BeginContext and switches back to the main context.
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*
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* @update 04/04/99 harishd
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* @param aPosition - Validates the end of a context.
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*/
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NS_IMETHOD EndContext(PRInt32 aPosition) = 0;
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/**
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* @update 01/09/2003 harishd
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* @param aTag - Check if this tag is enabled or not.
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*/
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NS_IMETHOD IsEnabled(PRInt32 aTag, PRBool* aReturn) = 0;
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/**
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* This method is called when parser has
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* completed processing a chunk of tokens. The processing of the
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* tokens may be interrupted by returning NS_ERROR_HTMLPARSER_INTERRUPTED from
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* DidProcessAToken.
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*/
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NS_IMETHOD DidProcessTokens() = 0;
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/**
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* This method is called when parser is about to
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* process a single token
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*/
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NS_IMETHOD WillProcessAToken(void) = 0;
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/**
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* This method is called when parser has completed
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* the processing for a single token.
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* @return NS_OK if processing should not be interrupted
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* NS_ERROR_HTMLPARSER_INTERRUPTED if the parsing should be interrupted
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*/
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NS_IMETHOD DidProcessAToken(void) = 0;
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/**
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* This method is used to open a generic container in the sink.
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*
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* @update 4/1/98 gess
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* @param nsIParserNode reference to parser node interface
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*/
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NS_IMETHOD OpenContainer(const nsIParserNode& aNode) = 0;
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/**
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* This method gets called by the parser when a close
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* container tag has been consumed and needs to be closed.
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*
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* @param aTag - The tag to be closed.
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*/
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NS_IMETHOD CloseContainer(const nsHTMLTag aTag) = 0;
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/**
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* This method is used when we're closing a tag that was malformed
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* in some way. This way, the content sink can do special processing
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* (e.g., not execute a malformed script tag).
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*
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* @param aTag The tag to be closed.
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*/
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NS_IMETHOD CloseMalformedContainer(const nsHTMLTag aTag)
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{
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return CloseContainer(aTag);
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}
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/**
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* This gets called by the parser when you want to add
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* a leaf node to the current container in the content
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* model.
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*
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* @update 4/1/98 gess
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* @param nsIParserNode reference to parser node interface
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*/
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NS_IMETHOD AddLeaf(const nsIParserNode& aNode) = 0;
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/**
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* This gets called by the parser when you want to add
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* a leaf node to the current container in the content
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* model.
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*
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* @update 4/1/98 gess
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* @param nsIParserNode reference to parser node interface
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*/
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NS_IMETHOD AddComment(const nsIParserNode& aNode) = 0;
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/**
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* This gets called by the parser when you want to add
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* a leaf node to the current container in the content
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* model.
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*
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* @update 4/1/98 gess
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* @param nsIParserNode reference to parser node interface
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*/
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NS_IMETHOD AddProcessingInstruction(const nsIParserNode& aNode) = 0;
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/**
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* This method is called by the parser when it encounters
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* a document type declaration.
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*
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* XXX Should the parser also parse the internal subset?
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*
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* @param nsIParserNode reference to parser node interface
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*/
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NS_IMETHOD AddDocTypeDecl(const nsIParserNode& aNode) = 0;
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/**
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* This gets called by the parser to notify observers of
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* the tag
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*
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* @param aErrorResult the error code
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*/
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NS_IMETHOD NotifyTagObservers(nsIParserNode* aNode) = 0;
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/**
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* Call this method to determnine if a FORM is on the sink's stack
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*
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* @return PR_TRUE if found else PR_FALSE
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*/
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NS_IMETHOD_(PRBool) IsFormOnStack() = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIHTMLContentSink, NS_IHTML_CONTENT_SINK_IID)
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#endif /* nsIHTMLContentSink_h___ */
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