381 lines
9.5 KiB
C++
381 lines
9.5 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: ubidi.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 1999sep15
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* created by: Markus W. Scherer
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*/
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#ifndef BIDI_H
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#define BIDI_H
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#include "unicode/utypes.h"
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#include "unicode/ubidi.h"
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#ifndef XP_CPLUSPLUS
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# error This is a C++ header file.
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#endif
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/**
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* BiDi is a C++ wrapper class for UBiDi.
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* You need one BiDi object in place of one UBiDi object.
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* For details on the API and implementation of the
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* Unicode BiDi algorithm, see ubidi.h.
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*
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* @see UBiDi
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* @stable
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*/
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class U_COMMON_API BiDi {
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public:
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/** @memo Default constructor, calls ubidi_open().
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* @stable
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*/
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BiDi();
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/** @memo Constructor, calls ubidi_open().
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* @stable
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*/
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BiDi(UErrorCode &rErrorCode);
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/** @memo Preallocating constructor, calls ubidi_openSized().
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* @stable
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*/
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BiDi(UTextOffset maxLength, UTextOffset maxRunCount, UErrorCode &rErrorCode);
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/** @memo Destructor, calls ubidi_close().
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* @stable
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*/
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~BiDi();
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/**
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* Modify the operation of the BiDi algorithm such that it
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* approximates an "inverse BiDi" algorithm. This function
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* must be called before <code>setPara()</code>.
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*
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* @param isInverse specifies "forward" or "inverse" BiDi operation
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*
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* @see setPara
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* @see writeReordered
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* @draft
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*/
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void
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setInverse(UBool isInverse);
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/**
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* Is this BiDi object set to perform the inverse BiDi algorithm?
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*
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* @see setInverse
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* @draft
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*/
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UBool
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isInverse();
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/** @memo Set this object for one paragraph's text.
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* @stable
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*/
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BiDi &
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setPara(const UChar *text, UTextOffset length,
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UBiDiLevel paraLevel, UBiDiLevel *embeddingLevels,
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UErrorCode &rErrorCode);
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/** @memo Set this object for one line of the paragraph object's text.
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* @stable
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*/
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BiDi &
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setLine(const BiDi &rParaBiDi,
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UTextOffset start, UTextOffset limit,
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UErrorCode &rErrorCode);
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/** @memo Get the directionality of the text.
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* @stable
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*/
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UBiDiDirection
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getDirection() const;
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/** @memo Get the pointer to the text.
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* @draft
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*/
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const UChar *
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getText() const;
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/** @memo Get the length of the text.
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* @stable
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*/
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UTextOffset
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getLength() const;
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/** @memo Get the paragraph level of the text.
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* @stable
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*/
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UBiDiLevel
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getParaLevel() const;
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/** @memo Get the level for one character.
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* @stable
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*/
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UBiDiLevel
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getLevelAt(UTextOffset charIndex) const;
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/** @memo Get an array of levels for each character.
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* @stable
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*/
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const UBiDiLevel *
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getLevels(UErrorCode &rErrorCode);
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/** @memo Get a logical run.
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* @stable
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*/
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void
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getLogicalRun(UTextOffset logicalStart,
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UTextOffset &rLogicalLimit, UBiDiLevel &rLevel) const;
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/** @memo Get the number of runs.
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* @stable
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*/
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UTextOffset
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countRuns(UErrorCode &rErrorCode);
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/**
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* @memo Get one run's logical start, length, and directionality,
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* which can be 0 for LTR or 1 for RTL.
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* @stable
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*/
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UBiDiDirection
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getVisualRun(UTextOffset runIndex, UTextOffset &rLogicalStart, UTextOffset &rLength);
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/** @memo Get the visual position from a logical text position.
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* @stable
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*/
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UTextOffset
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getVisualIndex(UTextOffset logicalIndex, UErrorCode &rErrorCode);
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/** @memo Get the logical text position from a visual position.
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* @stable
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*/
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UTextOffset
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getLogicalIndex(UTextOffset visualIndex, UErrorCode &rErrorCode);
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/**
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* @memo Get a logical-to-visual index map (array) for the characters in the UBiDi
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* (paragraph or line) object.
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* @stable
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*/
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void
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getLogicalMap(UTextOffset *indexMap, UErrorCode &rErrorCode);
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/**
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* @memo Get a visual-to-logical index map (array) for the characters in the UBiDi
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* (paragraph or line) object.
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* @stable
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*/
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void
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getVisualMap(UTextOffset *indexMap, UErrorCode &rErrorCode);
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/** @memo Same as ubidi_reorderLogical().
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* @stable
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*/
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static void
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reorderLogical(const UBiDiLevel *levels, UTextOffset length, UTextOffset *indexMap);
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/** @memo Same as ubidi_reorderVisual().
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* @stable
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*/
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static void
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reorderVisual(const UBiDiLevel *levels, UTextOffset length, UTextOffset *indexMap);
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/** @memo Same as ubidi_invertMap().
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* @stable
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*/
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static void
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invertMap(const UTextOffset *srcMap, UTextOffset *destMap, UTextOffset length);
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/**
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* Use the <code>BiDi</code> object containing the reordering
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* information for one paragraph or line of text as set by
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* <code>setPara()</code> or <code>setLine()</code> and
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* write a reordered string to the destination buffer.
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*
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* @see ubidi_writeReordered
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* @draft
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*/
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UTextOffset
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writeReordered(UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode &rErrorCode);
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/**
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* Reverse a Right-To-Left run of Unicode text.
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*
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* @see ubidi_writeReverse
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* @draft
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*/
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static UTextOffset
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writeReverse(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode &rErrorCode);
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protected:
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UBiDi *pBiDi;
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};
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/* Inline implementations. -------------------------------------------------- */
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inline BiDi::BiDi() {
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pBiDi=ubidi_open();
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}
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inline BiDi::BiDi(UErrorCode &rErrorCode) {
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if(U_SUCCESS(rErrorCode)) {
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pBiDi=ubidi_open();
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if(pBiDi==0) {
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rErrorCode=U_MEMORY_ALLOCATION_ERROR;
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}
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} else {
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pBiDi=0;
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}
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}
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inline BiDi::BiDi(UTextOffset maxLength, UTextOffset maxRunCount, UErrorCode &rErrorCode) {
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pBiDi=ubidi_openSized(maxLength, maxRunCount, &rErrorCode);
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}
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inline BiDi::~BiDi() {
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ubidi_close(pBiDi);
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pBiDi=0;
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}
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inline void
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BiDi::setInverse(UBool isInverse) {
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ubidi_setInverse(pBiDi, isInverse);
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}
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inline UBool
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BiDi::isInverse() {
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return ubidi_isInverse(pBiDi);
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}
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inline BiDi &
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BiDi::setPara(const UChar *text, UTextOffset length,
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UBiDiLevel paraLevel, UBiDiLevel *embeddingLevels,
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UErrorCode &rErrorCode) {
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ubidi_setPara(pBiDi, text, length, paraLevel, embeddingLevels, &rErrorCode);
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return *this;
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}
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inline BiDi &
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BiDi::setLine(const BiDi &rParaBiDi,
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UTextOffset start, UTextOffset limit,
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UErrorCode &rErrorCode) {
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ubidi_setLine(rParaBiDi.pBiDi, start, limit, pBiDi, &rErrorCode);
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return *this;
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}
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inline UBiDiDirection
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BiDi::getDirection() const {
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return ubidi_getDirection(pBiDi);
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}
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inline const UChar *
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BiDi::getText() const {
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return ubidi_getText(pBiDi);
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}
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inline UTextOffset
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BiDi::getLength() const {
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return ubidi_getLength(pBiDi);
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}
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inline UBiDiLevel
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BiDi::getParaLevel() const {
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return ubidi_getParaLevel(pBiDi);
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}
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inline UBiDiLevel
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BiDi::getLevelAt(UTextOffset charIndex) const {
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return ubidi_getLevelAt(pBiDi, charIndex);
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}
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inline const UBiDiLevel *
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BiDi::getLevels(UErrorCode &rErrorCode) {
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return ubidi_getLevels(pBiDi, &rErrorCode);
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}
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inline void
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BiDi::getLogicalRun(UTextOffset logicalStart,
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UTextOffset &rLogicalLimit, UBiDiLevel &rLevel) const {
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ubidi_getLogicalRun(pBiDi, logicalStart, &rLogicalLimit, &rLevel);
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}
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inline UTextOffset
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BiDi::countRuns(UErrorCode &rErrorCode) {
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return ubidi_countRuns(pBiDi, &rErrorCode);
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}
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inline UBiDiDirection
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BiDi::getVisualRun(UTextOffset runIndex, UTextOffset &rLogicalStart, UTextOffset &rLength) {
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return ubidi_getVisualRun(pBiDi, runIndex, &rLogicalStart, &rLength);
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}
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inline UTextOffset
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BiDi::getVisualIndex(UTextOffset logicalIndex, UErrorCode &rErrorCode) {
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return ubidi_getVisualIndex(pBiDi, logicalIndex, &rErrorCode);
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}
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inline UTextOffset
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BiDi::getLogicalIndex(UTextOffset visualIndex, UErrorCode &rErrorCode) {
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return ubidi_getLogicalIndex(pBiDi, visualIndex, &rErrorCode);
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}
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inline void
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BiDi::getLogicalMap(UTextOffset *indexMap, UErrorCode &rErrorCode) {
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ubidi_getLogicalMap(pBiDi, indexMap, &rErrorCode);
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}
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inline void
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BiDi::getVisualMap(UTextOffset *indexMap, UErrorCode &rErrorCode) {
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ubidi_getVisualMap(pBiDi, indexMap, &rErrorCode);
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}
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inline void
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BiDi::reorderLogical(const UBiDiLevel *levels, UTextOffset length, UTextOffset *indexMap) {
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ubidi_reorderLogical(levels, length, indexMap);
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}
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inline void
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BiDi::reorderVisual(const UBiDiLevel *levels, UTextOffset length, UTextOffset *indexMap) {
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ubidi_reorderVisual(levels, length, indexMap);
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}
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inline void
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BiDi::invertMap(const UTextOffset *srcMap, UTextOffset *destMap, UTextOffset length) {
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ubidi_invertMap(srcMap, destMap, length);
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}
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inline UTextOffset
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BiDi::writeReordered(UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode &rErrorCode) {
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return ubidi_writeReordered(pBiDi, dest, destSize, options, &rErrorCode);
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}
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inline UTextOffset
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BiDi::writeReverse(const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destSize,
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uint16_t options,
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UErrorCode &rErrorCode) {
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return ubidi_writeReverse(src, srcLength, dest, destSize, options, &rErrorCode);
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}
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#endif
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