U_CAPI UBiDiLevel U_EXPORT2
ubidi_getLevelAt(const UBiDi *pBiDi, int32_t charIndex) {
/* return paraLevel if in the trailing WS run, otherwise the real level */
if(!IS_VALID_PARA_OR_LINE(pBiDi) || charIndex<0 || pBiDi->length<=charIndex) {
return 0;
} else if(pBiDi->direction!=UBIDI_MIXED || charIndex>=pBiDi->trailingWSStart) {
return GET_PARALEVEL(pBiDi, charIndex);
} else {
return pBiDi->levels[charIndex];
}
}
U_CAPI void U_EXPORT2
ubidi_getLogicalRun(const UBiDi * pBiDi, int32_t logicalPosition,
int32_t * pLogicalLimit, UBiDiLevel * pLevel)
{
UErrorCode errorCode;
int32_t runCount, visualStart, logicalLimit, logicalFirst, i;
Run iRun;
errorCode = U_ZERO_ERROR;
RETURN_VOID_IF_BAD_RANGE(logicalPosition, 0, pBiDi->length, errorCode);
/* ubidi_countRuns will check VALID_PARA_OR_LINE */
runCount = ubidi_countRuns((UBiDi *)pBiDi, &errorCode);
if (U_FAILURE(errorCode))
{
return;
}
/* this is done based on runs rather than on levels since levels have
a special interpretation when UBIDI_REORDER_RUNS_ONLY
*/
visualStart = logicalLimit = 0;
iRun = pBiDi->runs[0];
for (i = 0; i < runCount; i++)
{
iRun = pBiDi->runs[i];
logicalFirst = GET_INDEX(iRun.logicalStart);
logicalLimit = logicalFirst + iRun.visualLimit - visualStart;
if ((logicalPosition >= logicalFirst) &&
(logicalPosition < logicalLimit))
{
break;
}
visualStart = iRun.visualLimit;
}
if (pLogicalLimit)
{
*pLogicalLimit = logicalLimit;
}
if (pLevel)
{
if (pBiDi->reorderingMode == UBIDI_REORDER_RUNS_ONLY)
{
*pLevel = (UBiDiLevel)GET_ODD_BIT(iRun.logicalStart);
}
else if (pBiDi->direction != UBIDI_MIXED || logicalPosition >= pBiDi->trailingWSStart)
{
*pLevel = GET_PARALEVEL(pBiDi, logicalPosition);
}
else
{
*pLevel = pBiDi->levels[logicalPosition];
}
}
}
U_CAPI void U_EXPORT2
ubidi_setLine(const UBiDi *pParaBiDi,
int32_t start, int32_t limit,
UBiDi *pLineBiDi,
UErrorCode *pErrorCode) {
int32_t length;
/* check the argument values */
RETURN_VOID_IF_NULL_OR_FAILING_ERRCODE(pErrorCode);
RETURN_VOID_IF_NOT_VALID_PARA(pParaBiDi, *pErrorCode);
RETURN_VOID_IF_BAD_RANGE(start, 0, limit, *pErrorCode);
RETURN_VOID_IF_BAD_RANGE(limit, 0, pParaBiDi->length+1, *pErrorCode);
if(pLineBiDi==NULL) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return;
}
if(ubidi_getParagraph(pParaBiDi, start, NULL, NULL, NULL, pErrorCode) !=
ubidi_getParagraph(pParaBiDi, limit-1, NULL, NULL, NULL, pErrorCode)) {
/* the line crosses a paragraph boundary */
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return;
}
/* set the values in pLineBiDi from its pParaBiDi parent */
pLineBiDi->pParaBiDi=NULL; /* mark unfinished setLine */
pLineBiDi->text=pParaBiDi->text+start;
length=pLineBiDi->length=limit-start;
pLineBiDi->resultLength=pLineBiDi->originalLength=length;
pLineBiDi->paraLevel=GET_PARALEVEL(pParaBiDi, start);
pLineBiDi->paraCount=pParaBiDi->paraCount;
pLineBiDi->runs=NULL;
pLineBiDi->flags=0;
pLineBiDi->reorderingMode=pParaBiDi->reorderingMode;
pLineBiDi->reorderingOptions=pParaBiDi->reorderingOptions;
pLineBiDi->controlCount=0;
if(pParaBiDi->controlCount>0) {
int32_t j;
for(j=start; j<limit; j++) {
if(IS_BIDI_CONTROL_CHAR(pParaBiDi->text[j])) {
pLineBiDi->controlCount++;
}
}
pLineBiDi->resultLength-=pLineBiDi->controlCount;
}
pLineBiDi->dirProps=pParaBiDi->dirProps+start;
pLineBiDi->levels=pParaBiDi->levels+start;
pLineBiDi->runCount=-1;
if(pParaBiDi->direction!=UBIDI_MIXED) {
/* the parent is already trivial */
pLineBiDi->direction=pParaBiDi->direction;
/*
* The parent's levels are all either
* implicitly or explicitly ==paraLevel;
* do the same here.
*/
if(pParaBiDi->trailingWSStart<=start) {
pLineBiDi->trailingWSStart=0;
} else if(pParaBiDi->trailingWSStart<limit) {
pLineBiDi->trailingWSStart=pParaBiDi->trailingWSStart-start;
} else {
pLineBiDi->trailingWSStart=length;
}
} else {
const UBiDiLevel *levels=pLineBiDi->levels;
int32_t i, trailingWSStart;
UBiDiLevel level;
setTrailingWSStart(pLineBiDi);
trailingWSStart=pLineBiDi->trailingWSStart;
/* recalculate pLineBiDi->direction */
if(trailingWSStart==0) {
/* all levels are at paraLevel */
pLineBiDi->direction=(UBiDiDirection)(pLineBiDi->paraLevel&1);
} else {
/* get the level of the first character */
level=(UBiDiLevel)(levels[0]&1);
/* if there is anything of a different level, then the line is mixed */
if(trailingWSStart<length && (pLineBiDi->paraLevel&1)!=level) {
/* the trailing WS is at paraLevel, which differs from levels[0] */
pLineBiDi->direction=UBIDI_MIXED;
} else {
/* see if levels[1..trailingWSStart-1] have the same direction as levels[0] and paraLevel */
i=1;
for(;;) {
if(i==trailingWSStart) {
/* the direction values match those in level */
pLineBiDi->direction=(UBiDiDirection)level;
break;
} else if((levels[i]&1)!=level) {
pLineBiDi->direction=UBIDI_MIXED;
break;
}
++i;
}
}
}
switch(pLineBiDi->direction) {
case UBIDI_LTR:
/* make sure paraLevel is even */
pLineBiDi->paraLevel=(UBiDiLevel)((pLineBiDi->paraLevel+1)&~1);
/* all levels are implicitly at paraLevel (important for ubidi_getLevels()) */
pLineBiDi->trailingWSStart=0;
break;
case UBIDI_RTL:
/* make sure paraLevel is odd */
pLineBiDi->paraLevel|=1;
/* all levels are implicitly at paraLevel (important for ubidi_getLevels()) */
pLineBiDi->trailingWSStart=0;
break;
default:
break;
}
}
pLineBiDi->pParaBiDi=pParaBiDi; /* mark successful setLine */
return;
}