529 lines
20 KiB
C
529 lines
20 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 2016 and later: Unicode, Inc. and others.
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* License & terms of use: http://www.unicode.org/copyright.html
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*
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******************************************************************************
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* file name: ubiditransform.c
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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: 2016jul24
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* created by: Lina Kemmel
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*
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*/
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#include "cmemory.h"
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#include "unicode/ubidi.h"
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#include "unicode/ustring.h"
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#include "unicode/ushape.h"
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#include "unicode/utf16.h"
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#include "ustr_imp.h"
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#include "unicode/ubiditransform.h"
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/* Some convenience defines */
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#define LTR UBIDI_LTR
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#define RTL UBIDI_RTL
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#define LOGICAL UBIDI_LOGICAL
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#define VISUAL UBIDI_VISUAL
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#define SHAPE_LOGICAL U_SHAPE_TEXT_DIRECTION_LOGICAL
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#define SHAPE_VISUAL U_SHAPE_TEXT_DIRECTION_VISUAL_LTR
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#define CHECK_LEN(STR, LEN, ERROR) { \
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if (LEN == 0) return 0; \
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if (LEN < -1) { *(ERROR) = U_ILLEGAL_ARGUMENT_ERROR; return 0; } \
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if (LEN == -1) LEN = u_strlen(STR); \
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}
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#define MAX_ACTIONS 7
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/**
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* Typedef for a pointer to a function, which performs some operation (such as
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* reordering, setting "inverse" mode, character mirroring, etc.). Return value
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* indicates whether the text was changed in the course of this operation or
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* not.
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*/
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typedef UBool (*UBiDiAction)(UBiDiTransform *, UErrorCode *);
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/**
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* Structure that holds a predefined reordering scheme, including the following
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* information:
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* <ul>
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* <li>an input base direction,</li>
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* <li>an input order,</li>
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* <li>an output base direction,</li>
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* <li>an output order,</li>
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* <li>a digit shaping direction,</li>
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* <li>a letter shaping direction,</li>
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* <li>a base direction that should be applied when the reordering engine is
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* invoked (which can not always be derived from the caller-defined
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* options),</li>
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* <li>an array of pointers to functions that accomplish the bidi layout
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* transformation.</li>
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* </ul>
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*/
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typedef struct {
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UBiDiLevel inLevel; /* input level */
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UBiDiOrder inOrder; /* input order */
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UBiDiLevel outLevel; /* output level */
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UBiDiOrder outOrder; /* output order */
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uint32_t digitsDir; /* digit shaping direction */
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uint32_t lettersDir; /* letter shaping direction */
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UBiDiLevel baseLevel; /* paragraph level to be used with setPara */
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const UBiDiAction actions[MAX_ACTIONS]; /* array of pointers to functions carrying out the transformation */
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} ReorderingScheme;
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struct UBiDiTransform {
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UBiDi *pBidi; /* pointer to a UBiDi object */
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const ReorderingScheme *pActiveScheme; /* effective reordering scheme */
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UChar *src; /* input text */
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UChar *dest; /* output text */
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uint32_t srcLength; /* input text length - not really needed as we are zero-terminated and can u_strlen */
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uint32_t srcSize; /* input text capacity excluding the trailing zero */
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uint32_t destSize; /* output text capacity */
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uint32_t *pDestLength; /* number of UChars written to dest */
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uint32_t reorderingOptions; /* reordering options - currently only suppot DO_MIRRORING */
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uint32_t digits; /* digit option for ArabicShaping */
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uint32_t letters; /* letter option for ArabicShaping */
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};
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U_DRAFT UBiDiTransform* U_EXPORT2
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ubiditransform_open(UErrorCode *pErrorCode)
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{
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UBiDiTransform *pBiDiTransform = NULL;
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if (U_SUCCESS(*pErrorCode)) {
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pBiDiTransform = (UBiDiTransform*) uprv_calloc(1, sizeof(UBiDiTransform));
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if (pBiDiTransform == NULL) {
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*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
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}
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}
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return pBiDiTransform;
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}
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U_DRAFT void U_EXPORT2
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ubiditransform_close(UBiDiTransform *pBiDiTransform)
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{
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if (pBiDiTransform != NULL) {
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if (pBiDiTransform->pBidi != NULL) {
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ubidi_close(pBiDiTransform->pBidi);
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}
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if (pBiDiTransform->src != NULL) {
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uprv_free(pBiDiTransform->src);
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}
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uprv_free(pBiDiTransform);
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}
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}
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/**
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* Performs Bidi resolution of text.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_resolve(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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ubidi_setPara(pTransform->pBidi, pTransform->src, pTransform->srcLength,
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pTransform->pActiveScheme->baseLevel, NULL, pErrorCode);
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return FALSE;
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}
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/**
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* Performs basic reordering of text (Logical -> Visual LTR).
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_reorder(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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ubidi_writeReordered(pTransform->pBidi, pTransform->dest, pTransform->destSize,
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pTransform->reorderingOptions, pErrorCode);
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*pTransform->pDestLength = pTransform->srcLength;
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pTransform->reorderingOptions = UBIDI_REORDER_DEFAULT;
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return TRUE;
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}
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/**
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* Sets "inverse" mode on the <code>UBiDi</code> object.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_setInverse(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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ubidi_setInverse(pTransform->pBidi, TRUE);
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ubidi_setReorderingMode(pTransform->pBidi, UBIDI_REORDER_INVERSE_LIKE_DIRECT);
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return FALSE;
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}
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/**
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* Sets "runs only" reordering mode indicating a Logical LTR <-> Logical RTL
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* transformation.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_setRunsOnly(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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ubidi_setReorderingMode(pTransform->pBidi, UBIDI_REORDER_RUNS_ONLY);
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return FALSE;
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}
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/**
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* Performs string reverse.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_reverse(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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ubidi_writeReverse(pTransform->src, pTransform->srcLength,
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pTransform->dest, pTransform->destSize,
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UBIDI_REORDER_DEFAULT, pErrorCode);
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*pTransform->pDestLength = pTransform->srcLength;
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return TRUE;
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}
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/**
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* Applies a new value to the text that serves as input at the current
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* processing step. This value is identical to the original one when we begin
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* the processing, but usually changes as the transformation progresses.
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*
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* @param pTransform A pointer to the <code>UBiDiTransform</code> structure.
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* @param newSrc A pointer whose value is to be used as input text.
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* @param newLength A length of the new text in <code>UChar</code>s.
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* @param newSize A new source capacity in <code>UChar</code>s.
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* @param pErrorCode Pointer to the error code value.
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*/
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static void
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updateSrc(UBiDiTransform *pTransform, const UChar *newSrc, uint32_t newLength,
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uint32_t newSize, UErrorCode *pErrorCode)
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{
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if (newSize < newLength) {
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*pErrorCode = U_BUFFER_OVERFLOW_ERROR;
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return;
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}
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if (newSize > pTransform->srcSize) {
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newSize += 50; // allocate slightly more than needed right now
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if (pTransform->src != NULL) {
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uprv_free(pTransform->src);
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pTransform->src = NULL;
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}
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pTransform->src = (UChar *)uprv_malloc(newSize * sizeof(UChar));
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if (pTransform->src == NULL) {
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*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
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//pTransform->srcLength = pTransform->srcSize = 0;
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return;
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}
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pTransform->srcSize = newSize;
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}
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u_strncpy(pTransform->src, newSrc, newLength);
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pTransform->srcLength = u_terminateUChars(pTransform->src,
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pTransform->srcSize, newLength, pErrorCode);
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}
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/**
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* Calls a lower level shaping function.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param options Shaping options.
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* @param pErrorCode Pointer to the error code value.
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*/
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static void
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doShape(UBiDiTransform *pTransform, uint32_t options, UErrorCode *pErrorCode)
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{
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*pTransform->pDestLength = u_shapeArabic(pTransform->src,
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pTransform->srcLength, pTransform->dest, pTransform->destSize,
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options, pErrorCode);
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}
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/**
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* Performs digit and letter shaping.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_shapeArabic(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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if ((pTransform->letters | pTransform->digits) == 0) {
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return FALSE;
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}
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if (pTransform->pActiveScheme->lettersDir == pTransform->pActiveScheme->digitsDir) {
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doShape(pTransform, pTransform->letters | pTransform->digits | pTransform->pActiveScheme->lettersDir,
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pErrorCode);
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} else {
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doShape(pTransform, pTransform->digits | pTransform->pActiveScheme->digitsDir, pErrorCode);
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if (U_SUCCESS(*pErrorCode)) {
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updateSrc(pTransform, pTransform->dest, *pTransform->pDestLength,
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*pTransform->pDestLength, pErrorCode);
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doShape(pTransform, pTransform->letters | pTransform->pActiveScheme->lettersDir,
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pErrorCode);
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}
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}
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return TRUE;
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}
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/**
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* Performs character mirroring.
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*
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* @param pTransform Pointer to the <code>UBiDiTransform</code> structure.
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* @param pErrorCode Pointer to the error code value.
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*
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* @return Whether or not this function modifies the text. Besides the return
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* value, the caller should also check <code>U_SUCCESS(*pErrorCode)</code>.
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*/
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static UBool
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action_mirror(UBiDiTransform *pTransform, UErrorCode *pErrorCode)
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{
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UChar32 c;
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uint32_t i = 0, j = 0;
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if (0 == (pTransform->reorderingOptions & UBIDI_DO_MIRRORING)) {
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return FALSE;
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}
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if (pTransform->destSize < pTransform->srcLength) {
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*pErrorCode = U_BUFFER_OVERFLOW_ERROR;
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return FALSE;
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}
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do {
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UBool isOdd = ubidi_getLevelAt(pTransform->pBidi, i) & 1;
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U16_NEXT(pTransform->src, i, pTransform->srcLength, c);
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U16_APPEND_UNSAFE(pTransform->dest, j, isOdd ? u_charMirror(c) : c);
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} while (i < pTransform->srcLength);
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*pTransform->pDestLength = pTransform->srcLength;
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pTransform->reorderingOptions = UBIDI_REORDER_DEFAULT;
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return TRUE;
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}
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/**
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* All possible reordering schemes.
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*
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*/
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static const ReorderingScheme Schemes[] =
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{
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/* 0: Logical LTR => Visual LTR */
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{LTR, LOGICAL, LTR, VISUAL, SHAPE_LOGICAL, SHAPE_LOGICAL, LTR,
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{action_shapeArabic, action_resolve, action_reorder, NULL}},
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/* 1: Logical RTL => Visual LTR */
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{RTL, LOGICAL, LTR, VISUAL, SHAPE_LOGICAL, SHAPE_VISUAL, RTL,
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{action_resolve, action_reorder, action_shapeArabic, NULL}},
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/* 2: Logical LTR => Visual RTL */
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{LTR, LOGICAL, RTL, VISUAL, SHAPE_LOGICAL, SHAPE_LOGICAL, LTR,
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{action_shapeArabic, action_resolve, action_reorder, action_reverse, NULL}},
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/* 3: Logical RTL => Visual RTL */
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{RTL, LOGICAL, RTL, VISUAL, SHAPE_LOGICAL, SHAPE_VISUAL, RTL,
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{action_resolve, action_reorder, action_shapeArabic, action_reverse, NULL}},
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/* 4: Visual LTR => Logical RTL */
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{LTR, VISUAL, RTL, LOGICAL, SHAPE_LOGICAL, SHAPE_VISUAL, RTL,
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{action_shapeArabic, action_setInverse, action_resolve, action_reorder, NULL}},
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/* 5: Visual RTL => Logical RTL */
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{RTL, VISUAL, RTL, LOGICAL, SHAPE_LOGICAL, SHAPE_VISUAL, RTL,
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{action_reverse, action_shapeArabic, action_setInverse, action_resolve, action_reorder, NULL}},
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/* 6: Visual LTR => Logical LTR */
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{LTR, VISUAL, LTR, LOGICAL, SHAPE_LOGICAL, SHAPE_LOGICAL, LTR,
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{action_setInverse, action_resolve, action_reorder, action_shapeArabic, NULL}},
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/* 7: Visual RTL => Logical LTR */
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{RTL, VISUAL, LTR, LOGICAL, SHAPE_LOGICAL, SHAPE_LOGICAL, LTR,
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{action_reverse, action_setInverse, action_resolve, action_reorder, action_shapeArabic, NULL}},
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/* 8: Logical LTR => Logical RTL */
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{LTR, LOGICAL, RTL, LOGICAL, SHAPE_LOGICAL, SHAPE_LOGICAL, LTR,
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{action_shapeArabic, action_resolve, action_mirror, action_setRunsOnly, action_resolve, action_reorder, NULL}},
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/* 9: Logical RTL => Logical LTR */
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{RTL, LOGICAL, LTR, LOGICAL, SHAPE_LOGICAL, SHAPE_LOGICAL, RTL,
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{action_resolve, action_mirror, action_setRunsOnly, action_resolve, action_reorder, action_shapeArabic, NULL}},
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/* 10: Visual LTR => Visual RTL */
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{LTR, VISUAL, RTL, VISUAL, SHAPE_LOGICAL, SHAPE_VISUAL, LTR,
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{action_shapeArabic, action_setInverse, action_resolve, action_mirror, action_reverse, NULL}},
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/* 11: Visual RTL => Visual LTR */
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{RTL, VISUAL, LTR, VISUAL, SHAPE_LOGICAL, SHAPE_VISUAL, LTR,
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{action_reverse, action_shapeArabic, action_setInverse, action_resolve, action_mirror, NULL}},
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/* 12: Logical LTR => Logical LTR */
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{LTR, LOGICAL, LTR, LOGICAL, SHAPE_LOGICAL, SHAPE_LOGICAL, LTR,
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{action_resolve, action_mirror, action_shapeArabic, NULL}},
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/* 13: Logical RTL => Logical RTL */
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{RTL, LOGICAL, RTL, LOGICAL, SHAPE_VISUAL, SHAPE_LOGICAL, RTL,
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{action_resolve, action_mirror, action_shapeArabic, NULL}},
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/* 14: Visual LTR => Visual LTR */
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{LTR, VISUAL, LTR, VISUAL, SHAPE_LOGICAL, SHAPE_VISUAL, LTR,
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{action_resolve, action_mirror, action_shapeArabic, NULL}},
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/* 15: Visual RTL => Visual RTL */
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{RTL, VISUAL, RTL, VISUAL, SHAPE_LOGICAL, SHAPE_VISUAL, LTR,
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{action_reverse, action_resolve, action_mirror, action_shapeArabic, action_reverse, NULL}}
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};
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static const uint32_t nSchemes = sizeof(Schemes) / sizeof(*Schemes);
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/**
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* When the direction option is <code>UBIDI_DEFAULT_LTR</code> or
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* <code>UBIDI_DEFAULT_RTL</code>, resolve the base direction according to that
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* of the first strong bidi character.
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*/
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static void
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resolveBaseDirection(const UChar *text, uint32_t length,
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UBiDiLevel *pInLevel, UBiDiLevel *pOutLevel)
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{
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switch (*pInLevel) {
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case UBIDI_DEFAULT_LTR:
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case UBIDI_DEFAULT_RTL: {
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UBiDiLevel level = ubidi_getBaseDirection(text, length);
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*pInLevel = level != UBIDI_NEUTRAL ? level
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: *pInLevel == UBIDI_DEFAULT_RTL ? RTL : LTR;
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break;
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}
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default:
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*pInLevel &= 1;
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break;
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}
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switch (*pOutLevel) {
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case UBIDI_DEFAULT_LTR:
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case UBIDI_DEFAULT_RTL:
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*pOutLevel = *pInLevel;
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break;
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default:
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*pOutLevel &= 1;
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break;
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}
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}
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/**
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* Finds a valid <code>ReorderingScheme</code> matching the
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* caller-defined scheme.
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*
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* @return A valid <code>ReorderingScheme</code> object or NULL
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*/
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static const ReorderingScheme*
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findMatchingScheme(UBiDiLevel inLevel, UBiDiLevel outLevel,
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UBiDiOrder inOrder, UBiDiOrder outOrder)
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{
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uint32_t i;
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for (i = 0; i < nSchemes; i++) {
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const ReorderingScheme *pScheme = Schemes + i;
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if (inLevel == pScheme->inLevel && outLevel == pScheme->outLevel
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&& inOrder == pScheme->inOrder && outOrder == pScheme->outOrder) {
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return pScheme;
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}
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}
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return NULL;
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}
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U_DRAFT uint32_t U_EXPORT2
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ubiditransform_transform(UBiDiTransform *pBiDiTransform,
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const UChar *src, int32_t srcLength,
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UChar *dest, int32_t destSize,
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UBiDiLevel inParaLevel, UBiDiOrder inOrder,
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UBiDiLevel outParaLevel, UBiDiOrder outOrder,
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UBiDiMirroring doMirroring, uint32_t shapingOptions,
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UErrorCode *pErrorCode)
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{
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uint32_t destLength = 0;
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UBool textChanged = FALSE;
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const UBiDiTransform *pOrigTransform = pBiDiTransform;
|
|
const UBiDiAction *action = NULL;
|
|
|
|
if (U_FAILURE(*pErrorCode)) {
|
|
return 0;
|
|
}
|
|
if (src == NULL || dest == NULL) {
|
|
*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return 0;
|
|
}
|
|
CHECK_LEN(src, srcLength, pErrorCode);
|
|
CHECK_LEN(dest, destSize, pErrorCode);
|
|
|
|
if (pBiDiTransform == NULL) {
|
|
pBiDiTransform = ubiditransform_open(pErrorCode);
|
|
if (U_FAILURE(*pErrorCode)) {
|
|
return 0;
|
|
}
|
|
}
|
|
/* Current limitation: in multiple paragraphs will be resolved according
|
|
to the 1st paragraph */
|
|
resolveBaseDirection(src, srcLength, &inParaLevel, &outParaLevel);
|
|
|
|
pBiDiTransform->pActiveScheme = findMatchingScheme(inParaLevel, outParaLevel,
|
|
inOrder, outOrder);
|
|
if (pBiDiTransform->pActiveScheme == NULL) {
|
|
goto cleanup;
|
|
}
|
|
pBiDiTransform->reorderingOptions = doMirroring ? UBIDI_DO_MIRRORING
|
|
: UBIDI_REORDER_DEFAULT;
|
|
|
|
/* Ignore TEXT_DIRECTION_* flags, as we apply our own depending on the text
|
|
scheme at the time shaping is invoked. */
|
|
shapingOptions &= ~U_SHAPE_TEXT_DIRECTION_MASK;
|
|
pBiDiTransform->digits = shapingOptions & ~U_SHAPE_LETTERS_MASK;
|
|
pBiDiTransform->letters = shapingOptions & ~U_SHAPE_DIGITS_MASK;
|
|
|
|
updateSrc(pBiDiTransform, src, srcLength, destSize > srcLength ? destSize : srcLength, pErrorCode);
|
|
if (U_FAILURE(*pErrorCode)) {
|
|
goto cleanup;
|
|
}
|
|
if (pBiDiTransform->pBidi == NULL) {
|
|
pBiDiTransform->pBidi = ubidi_openSized(0, 0, pErrorCode);
|
|
if (U_FAILURE(*pErrorCode)) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
pBiDiTransform->dest = dest;
|
|
pBiDiTransform->destSize = destSize;
|
|
pBiDiTransform->pDestLength = &destLength;
|
|
|
|
/* Checking for U_SUCCESS() within the loop to bail out on first failure. */
|
|
for (action = pBiDiTransform->pActiveScheme->actions; *action && U_SUCCESS(*pErrorCode); action++) {
|
|
if ((*action)(pBiDiTransform, pErrorCode)) {
|
|
if (action + 1) {
|
|
updateSrc(pBiDiTransform, pBiDiTransform->dest, *pBiDiTransform->pDestLength,
|
|
*pBiDiTransform->pDestLength, pErrorCode);
|
|
}
|
|
textChanged = TRUE;
|
|
}
|
|
}
|
|
ubidi_setInverse(pBiDiTransform->pBidi, FALSE);
|
|
|
|
if (!textChanged && U_SUCCESS(*pErrorCode)) {
|
|
/* Text was not changed - just copy src to dest */
|
|
if (destSize < srcLength) {
|
|
*pErrorCode = U_BUFFER_OVERFLOW_ERROR;
|
|
} else {
|
|
u_strncpy(dest, src, srcLength);
|
|
destLength = srcLength;
|
|
}
|
|
}
|
|
cleanup:
|
|
if (pOrigTransform != pBiDiTransform) {
|
|
ubiditransform_close(pBiDiTransform);
|
|
} else {
|
|
pBiDiTransform->dest = NULL;
|
|
pBiDiTransform->pDestLength = NULL;
|
|
pBiDiTransform->srcLength = 0;
|
|
pBiDiTransform->destSize = 0;
|
|
}
|
|
return U_FAILURE(*pErrorCode) ? 0 : destLength;
|
|
}
|