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gecko-dev/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 1.1 (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 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.
*
* Contributor(s):
*/
#ifndef nsTextTransformer_h___
#define nsTextTransformer_h___
#include "nsTextFragment.h"
#include "nsISupports.h"
#include "nsIPresContext.h"
class nsIContent;
class nsIFrame;
class nsILineBreaker;
class nsIWordBreaker;
// XXX I'm sure there are other special characters
#define CH_NBSP 160
#define CH_ENSP 8194 //<!ENTITY ensp CDATA "&#8194;" -- en space, U+2002 ISOpub -->
#define CH_EMSP 8195 //<!ENTITY emsp CDATA "&#8195;" -- em space, U+2003 ISOpub -->
#define CH_THINSP 8291 //<!ENTITY thinsp CDATA "&#8201;" -- thin space, U+2009 ISOpub -->
#define CH_ZWNJ 8204 //<!ENTITY zwnj CDATA "&#8204;" -- zero width non-joiner, U+200C NEW RFC 2070#define CH_SHY 173
#define CH_SHY 173
#define NS_TEXT_TRANSFORMER_AUTO_WORD_BUF_SIZE 128 // used to be 256
// Indicates whether the transformed text should be left as ascii
#define NS_TEXT_TRANSFORMER_LEAVE_AS_ASCII 1
// If at any point during GetNextWord or GetPrevWord we
// run across a multibyte (> 127) unicode character.
#define NS_TEXT_TRANSFORMER_HAS_MULTIBYTE 2
// The text in the transform buffer is ascii
#define NS_TEXT_TRANSFORMER_TRANSFORMED_TEXT_IS_ASCII 4
// A growable text buffer that tries to avoid using malloc by having a
// builtin buffer. Ideally used as an automatic variable.
class nsAutoTextBuffer {
public:
nsAutoTextBuffer();
~nsAutoTextBuffer();
nsresult GrowBy(PRInt32 aAtLeast, PRBool aCopyToHead = PR_TRUE);
nsresult GrowTo(PRInt32 aNewSize, PRBool aCopyToHead = PR_TRUE);
PRUnichar* GetBuffer() { return mBuffer; }
PRUnichar* GetBufferEnd() { return mBuffer + mBufferLen; }
PRInt32 GetBufferLength() const { return mBufferLen; }
PRUnichar* mBuffer;
PRInt32 mBufferLen;
PRUnichar mAutoBuffer[NS_TEXT_TRANSFORMER_AUTO_WORD_BUF_SIZE];
};
//----------------------------------------
/**
* This object manages the transformation of text:
*
* <UL>
* <LI>whitespace compression
* <LI>capitalization
* <LI>lowercasing
* <LI>uppercasing
* <LI>ascii to Unicode (if requested)
* <LI>discarded characters
* <LI>conversion of &nbsp that is not part of whitespace into a space
* <LI>tab and newline characters to space (normal text only)
* </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,
nsIPresContext* aPresContext);
~nsTextTransformer();
/**
* Initialize the text transform. Use GetNextWord() and GetPrevWord()
* to iterate the text
*
* The default is to transform all text to Unicode; however, you can
* specify that the text should be left as ascii if possible. Note that
* we don't step the text down from Unicode to ascii (even if it doesn't
* contain multibyte characters) so this only happens for text fragments
* that contain 1-byte text.
* XXX This is currently not implemented for GetPreviousWord()
* @see TransformedTextIsAscii()
*/
nsresult Init(nsIFrame* aFrame,
nsIContent* aContent,
PRInt32 aStartingOffset,
PRBool aLeaveAsAscii = PR_FALSE);
PRInt32 GetContentLength() const {
return mFrag ? mFrag->GetLength() : 0;
}
/**
* Iterates the next word in the text fragment.
*
* Returns a pointer to the word, the number of characters in the word, the
* content length of the word, whether it is whitespace, and whether the
* text was transformed (any of the transformations listed above). The content
* length can be greater than the word length if whitespace compression occured
* or if characters were discarded
*
* The default behavior is to reset the transform buffer to the beginning,
* but you can choose to not reste it and buffer across multiple words
*/
PRUnichar* GetNextWord(PRBool aInWord,
PRInt32* aWordLenResult,
PRInt32* aContentLenResult,
PRBool* aIsWhitespaceResult,
PRBool* aWasTransformed,
PRBool aResetTransformBuf = PR_TRUE,
PRBool aForLineBreak = PR_TRUE);
PRUnichar* GetPrevWord(PRBool aInWord,
PRInt32* aWordLenResult,
PRInt32* aContentLenResult,
PRBool* aIsWhitespaceResult,
PRBool aForLineBreak = PR_TRUE);
// Returns PR_TRUE if the LEAVE_AS_ASCII flag is set
PRBool LeaveAsAscii() const {
return (mFlags & NS_TEXT_TRANSFORMER_LEAVE_AS_ASCII) ? PR_TRUE : PR_FALSE;
}
// Returns PR_TRUE if any of the characters are multibyte (greater than 127)
PRBool HasMultibyte() const {
return (mFlags & NS_TEXT_TRANSFORMER_HAS_MULTIBYTE) ? PR_TRUE : PR_FALSE;
}
// Returns PR_TRUE if the text in the transform bufer is ascii (i.e., it
// doesn't contain any multibyte characters)
PRBool TransformedTextIsAscii() const {
return (mFlags & NS_TEXT_TRANSFORMER_TRANSFORMED_TEXT_IS_ASCII) ? PR_TRUE : PR_FALSE;
}
// Set or clears the LEAVE_AS_ASCII bit
void SetLeaveAsAscii(PRBool aValue) {
aValue ? mFlags |= NS_TEXT_TRANSFORMER_LEAVE_AS_ASCII :
mFlags &= (~NS_TEXT_TRANSFORMER_LEAVE_AS_ASCII);
}
// Set or clears the NS_TEXT_TRANSFORMER_HAS_MULTIBYTE bit
void SetHasMultibyte(PRBool aValue) {
aValue ? mFlags |= NS_TEXT_TRANSFORMER_HAS_MULTIBYTE :
mFlags &= (~NS_TEXT_TRANSFORMER_HAS_MULTIBYTE);
}
// Set or clears the NS_TEXT_TRANSFORMER_TRANSFORMED_TEXT_IS_ASCII bit
void SetTransformedTextIsAscii(PRBool aValue) {
aValue ? mFlags |= NS_TEXT_TRANSFORMER_TRANSFORMED_TEXT_IS_ASCII :
mFlags &= (~NS_TEXT_TRANSFORMER_TRANSFORMED_TEXT_IS_ASCII);
}
PRUnichar* GetWordBuffer() {
return mTransformBuf.GetBuffer();
}
PRInt32 GetWordBufferLength() const {
return mTransformBuf.GetBufferLength();
}
static nsresult Initialize();
static void Shutdown();
protected:
// Helper methods for GetNextWord (F == forwards)
PRInt32 ScanNormalWhiteSpace_F();
PRInt32 ScanNormalAsciiText_F(PRInt32* aWordLen,
PRBool* aWasTransformed);
PRInt32 ScanNormalAsciiText_F_ForWordBreak(PRInt32* aWordLen,
PRBool* aWasTransformed);
PRInt32 ScanNormalUnicodeText_F(PRBool aForLineBreak,
PRInt32* aWordLen,
PRBool* aWasTransformed);
PRInt32 ScanPreWrapWhiteSpace_F(PRInt32* aWordLen);
PRInt32 ScanPreAsciiData_F(PRInt32* aWordLen,
PRBool* aWasTransformed);
PRInt32 ScanPreData_F(PRInt32* aWordLen,
PRBool* aWasTransformed);
// Helper methods for GetPrevWord (B == backwards)
PRInt32 ScanNormalWhiteSpace_B();
PRInt32 ScanNormalAsciiText_B(PRInt32* aWordLen);
PRInt32 ScanNormalUnicodeText_B(PRBool aForLineBreak, PRInt32* aWordLen);
PRInt32 ScanPreWrapWhiteSpace_B(PRInt32* aWordLen);
PRInt32 ScanPreData_B(PRInt32* aWordLen);
// Converts the current text in the transform buffer from ascii to
// Unicode
void ConvertTransformedTextToUnicode();
void LanguageSpecificTransform(PRUnichar* aText, PRInt32 aLen,
PRBool* aWasTransformed);
// The text fragment that we are looking at
const nsTextFragment* mFrag;
// Our current offset into the text fragment
PRInt32 mOffset;
// The frame's white-space mode we are using to process text
enum {
eNormal,
ePreformatted,
ePreWrap
} mMode;
nsILineBreaker* mLineBreaker; // [WEAK]
nsIWordBreaker* mWordBreaker; // [WEAK]
nsLanguageSpecificTransformType mLanguageSpecificTransformType;
// Buffer used to hold the transformed words from GetNextWord or
// GetPrevWord
nsAutoTextBuffer mTransformBuf;
// Our current position within the buffer. Used when iterating the next
// word, because we may be requested to buffer across multiple words
PRInt32 mBufferPos;
// The frame's text-transform state
PRUint8 mTextTransform;
// Flag for controling mLeaveAsAscii, mHasMultibyte, mTransformedTextIsAscii
PRUint8 mFlags;
#ifdef DEBUG
static void SelfTest(nsILineBreaker* aLineBreaker,
nsIWordBreaker* aWordBreaker,
nsIPresContext* aPresContext);
nsresult Init2(const nsTextFragment* aFrag,
PRInt32 aStartingOffset,
PRUint8 aWhiteSpace,
PRUint8 aTextTransform);
#endif
};
#endif /* nsTextTransformer_h___ */
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