pjs/layout/generic/nsTextTransformer.h

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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 1.0 (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 Communicator client 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.
*/
#ifndef nsTextTransformer_h___
#define nsTextTransformer_h___
#include "nsTextFragment.h"
#include "nsISupports.h"
class nsIContent;
class nsIFrame;
class nsTextRun;
class nsILineBreaker;
class nsIWordBreaker;
#define NS_TEXT_TRANSFORMER_AUTO_WORD_BUF_SIZE 100
/**
* This object manages the transformation of text:
*
* <UL>
* <LI>whitespace compression
* <LI>capitalization
* <LI>lowercasing
* <LI>uppercasing
* </UL>
*
* Note that no transformations are applied that would impact word
* breaking (like mapping &nbsp; into space, for example). In
* addition, this logic will not strip leading or trailing whitespace
* (across the entire run of text; leading whitespace can be skipped
* for a frames text because of whitespace compression).
*/
class nsTextTransformer {
public:
// Note: The text transformer does not hold a reference to the line
// breaker and work breaker objects
nsTextTransformer(nsILineBreaker* aLineBreaker,
nsIWordBreaker *aWordBreaker);
~nsTextTransformer();
/**
* Initialize the text transform. This is when the transformation
* occurs. Subsequent calls to GetTransformedTextFor will just
* return the result of the single transformation.
*/
nsresult Init(nsIFrame* aFrame,
nsIContent* aContent,
PRInt32 aStartingOffset);
PRInt32 GetContentLength() const {
return mContentLength;
}
PRUnichar* GetNextWord(PRBool aInWord,
PRInt32& aWordLenResult,
PRInt32& aContentLenResult,
PRBool& aIsWhitespaceResult,
PRBool aForLineBreak = PR_TRUE);
PRUnichar* GetPrevWord(PRBool aInWord,
PRInt32& aWordLenResult,
PRInt32& aContentLenResult,
PRBool& aIsWhitespaceResult,
PRBool aForLineBreak = PR_TRUE);
PRBool HasMultibyte() const {
return mHasMultibyte;
}
PRUnichar* GetWordBuffer() {
return mBuffer;
}
PRInt32 GetWordBufferLength() const {
return mBufferLength;
}
protected:
PRBool GrowBuffer(PRBool aForNextWord = PR_TRUE);
PRUnichar* mBuffer;
PRInt32 mBufferLength;
PRBool mHasMultibyte;
PRInt32 mContentLength;
PRInt32 mStartingOffset;
PRInt32 mOffset;
const nsTextFragment* mFrags;
PRInt32 mNumFrags;
const nsTextFragment* mCurrentFrag;
PRInt32 mCurrentFragOffset;
PRUint8 mTextTransform;
PRUint8 mPreformatted;
nsILineBreaker* mLineBreaker; // does NOT hold reference
nsIWordBreaker* mWordBreaker; // does NOT hold reference
PRUnichar mAutoWordBuffer[NS_TEXT_TRANSFORMER_AUTO_WORD_BUF_SIZE];
};
#endif /* nsTextTransformer_h___ */