pjs/parser/htmlparser/public/nsToken.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
/**
* MODULE NOTES:
* @update gess 4/1/98
*
* This class is defines the basic notion of a token
* within our system. All other tokens are derived from
* this one. It offers a few basic interfaces, but the
* most important is consume(). The consume() method gets
* called during the tokenization process when an instance
* of that particular token type gets detected in the
* input stream.
*
* CToken objects that are allocated from the heap _must_ be allocated
* using the nsTokenAllocator: the nsTokenAllocator object uses an
* arena to manage the tokens.
*
* The nsTokenAllocator object's arena implementation requires
* object size at destruction time to properly recycle the object;
* therefore, CToken::operator delete() is not public. Instead,
* heap-allocated tokens should be destroyed using the static
* Destroy() method, which accepts a token and the arena from which
* the token was allocated.
*
* Leaf classes (that are actually instantiated from the heap) must
* implement the SizeOf() method, which Destroy() uses to determine
* the size of the token in order to properly recycle it.
*/
#ifndef CTOKEN__
#define CTOKEN__
#include "prtypes.h"
#include "nsString.h"
#include "nsError.h"
#include "nsFileSpec.h"
#include "nsFixedSizeAllocator.h"
#define NS_HTMLTOKENS_NOT_AN_ENTITY \
NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_HTMLPARSER,2000)
class nsScanner;
class nsTokenAllocator;
enum eContainerInfo {
eWellFormed,
eMalformed,
eFormUnknown
};
/**
* Implement the SizeOf() method; leaf classes derived from CToken
* must declare this.
*/
#define CTOKEN_IMPL_SIZEOF \
protected: \
virtual size_t SizeOf() const { return sizeof(*this); } \
public:
/**
* Token objects represent sequences of characters as they
* are consumed from the input stream (URL). While they're
* pretty general in nature, we use subclasses (found in
* nsHTMLTokens.h) to define <start>, </end>, <text>,
* <comment>, <&entity>, <newline>, and <whitespace> tokens.
*
* @update gess 3/25/98
*/
class CToken {
public:
enum eTokenOrigin {eSource,eResidualStyle};
protected:
// nsTokenAllocator should be the only class that tries to
// allocate tokens from the heap.
friend class nsTokenAllocator;
/**
*
* @update harishd 08/01/00
* @param aSize -
* @param aArena - Allocate memory from this pool.
*/
static void * operator new (size_t aSize,nsFixedSizeAllocator& anArena)
{
return anArena.Alloc(aSize);
}
/**
* Hide operator delete; clients should use Destroy() instead.
*/
static void operator delete (void*,size_t) {}
public:
/**
* destructor
* @update gess5/11/98
*/
virtual ~CToken();
/**
* Destroy a token.
*/
static void Destroy(CToken* aToken,nsFixedSizeAllocator& aArenaPool)
{
size_t sz = aToken->SizeOf();
aToken->~CToken();
aArenaPool.Free(aToken, sz);
}
/**
* Make a note on number of times you have been referenced
* @update harishd 08/02/00
*/
void AddRef() { mUseCount++; }
/**
* Free yourself if no one is holding you.
* @update harishd 08/02/00
*/
void Release(nsFixedSizeAllocator& aArenaPool) {
if(--mUseCount==0)
Destroy(this, aArenaPool);
}
/**
* Default constructor
* @update gess7/21/98
*/
CToken(PRInt32 aTag=0);
/**
* Retrieve string value of the token
* @update gess5/11/98
* @return reference to string containing string value
*/
virtual const nsAReadableString& GetStringValue(void) = 0;
/**
* Get string of full contents, suitable for debug dump.
* It should look exactly like the input source.
* @update gess5/11/98
* @return reference to string containing string value
*/
virtual void GetSource(nsString& anOutputString);
/** @update harishd 03/23/00
* @return reference to string containing string value
*/
virtual void AppendSource(nsString& anOutputString);
/**
* Sets the ordinal value of this token (not currently used)
* @update gess5/11/98
* @param value is the new ord value for this token
*/
virtual void SetTypeID(PRInt32 aValue);
/**
* Getter which retrieves the current ordinal value for this token
* @update gess5/11/98
* @return current ordinal value
*/
virtual PRInt32 GetTypeID(void);
/**
* Sets the # of attributes found for this token.
* @update gess5/11/98
* @param value is the attr count
*/
virtual void SetAttributeCount(PRInt16 aValue);
/**
* Getter which retrieves the current attribute count for this token
* @update gess5/11/98
* @return current attribute count
*/
virtual PRInt16 GetAttributeCount(void);
/**
* Causes token to consume data from given scanner.
* Note that behavior varies wildly between CToken subclasses.
* @update gess5/11/98
* @param aChar -- most recent char consumed
* @param aScanner -- input source where token should get data
* @return error code (0 means ok)
*/
virtual nsresult Consume(PRUnichar aChar,nsScanner& aScanner,PRInt32 aMode);
#ifdef DEBUG
/**
* Causes token to dump itself in debug form to given output stream
* @update gess5/11/98
* @param out is the output stream where token should write itself
*/
virtual void DebugDumpToken(nsOutputStream& out);
/**
* Causes token to dump itself in source form to given output stream
* @update gess5/11/98
* @param out is the output stream where token should write itself
*/
virtual void DebugDumpSource(nsOutputStream& out);
#endif
/**
* Getter which retrieves type of token
* @update gess5/11/98
* @return int containing token type
*/
virtual PRInt32 GetTokenType(void);
/**
* Getter which retrieves the class name for this token
* This method is only used for debug purposes.
* @update gess5/11/98
* @return const char* containing class name
*/
virtual const char* GetClassName(void);
/**
* For tokens who care, this can tell us whether the token is
* well formed or not.
*
* @update gess 8/30/00
* @return PR_FALSE; subclasses MUST override if they care.
*/
virtual PRBool IsWellFormed(void) const {return PR_FALSE;}
/**
* perform self test.
* @update gess5/11/98
*/
virtual void SelfTest(void);
static int GetTokenCount();
eTokenOrigin mOrigin;
PRInt32 mNewlineCount;
protected:
/**
* Returns the size of the token object.
*/
virtual size_t SizeOf() const = 0;
PRInt32 mTypeID;
PRInt16 mAttrCount;
PRInt32 mUseCount;
};
#endif