Beispiel #1
0
U_CAPI const UBiDiLevel * U_EXPORT2
ubidi_getLevels(UBiDi * pBiDi, UErrorCode * pErrorCode)
{
	int32_t start, length;

	RETURN_IF_NULL_OR_FAILING_ERRCODE(pErrorCode, NULL);
	RETURN_IF_NOT_VALID_PARA_OR_LINE(pBiDi, *pErrorCode, NULL);
	if ((length = pBiDi->length) <= 0)
	{
		*pErrorCode = U_ILLEGAL_ARGUMENT_ERROR;
		return NULL;
	}
	if ((start = pBiDi->trailingWSStart) == length)
	{
		/* the current levels array reflects the WS run */
		return pBiDi->levels;
	}

	/*
	 * After the previous if(), we know that the levels array
	 * has an implicit trailing WS run and therefore does not fully
	 * reflect itself all the levels.
	 * This must be a UBiDi object for a line, and
	 * we need to create a new levels array.
	 */
	if (getLevelsMemory(pBiDi, length))
	{
		UBiDiLevel * levels = pBiDi->levelsMemory;

		if (start > 0 && levels != pBiDi->levels)
		{
			uprv_memcpy(levels, pBiDi->levels, start);
		}
		/* pBiDi->paraLevel is ok even if contextual multiple paragraphs,
		   since pBidi is a line object                                     */
		uprv_memset(levels + start, pBiDi->paraLevel, length - start);

		/* this new levels array is set for the line and reflects the WS run */
		pBiDi->trailingWSStart = length;
		return pBiDi->levels = levels;
	}
	else
	{
		/* out of memory */
		*pErrorCode = U_MEMORY_ALLOCATION_ERROR;
		return NULL;
	}
}
Beispiel #2
0
U_CAPI const UBiDiLevel * U_EXPORT2
ubidi_getLevels(UBiDi *pBiDi, UErrorCode *pErrorCode) {
    int32_t start, length;

    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
        return NULL;
    } else if(pBiDi==NULL || (length=pBiDi->length)<=0) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return NULL;
    }

    if((start=pBiDi->trailingWSStart)==length) {
        /* the current levels array reflects the WS run */
        return pBiDi->levels;
    }

    /*
     * After the previous if(), we know that the levels array
     * has an implicit trailing WS run and therefore does not fully
     * reflect itself all the levels.
     * This must be a UBiDi object for a line, and
     * we need to create a new levels array.
     */

    if(getLevelsMemory(pBiDi, length)) {
        UBiDiLevel *levels=pBiDi->levelsMemory;

        if(start>0 && levels!=pBiDi->levels) {
            icu_memcpy(levels, pBiDi->levels, start);
        }
        icu_memset(levels+start, pBiDi->paraLevel, length-start);

        /* this new levels array is set for the line and reflects the WS run */
        pBiDi->trailingWSStart=length;
        return pBiDi->levels=levels;
    } else {
        /* out of memory */
        *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
        return NULL;
    }
}
Beispiel #3
0
U_CAPI void U_EXPORT2
ubidi_setPara(UBiDi *pBiDi, const UChar *text, int32_t length,
              UBiDiLevel paraLevel, UBiDiLevel *embeddingLevels,
              UErrorCode *pErrorCode) {
    UBiDiDirection direction;

    /* check the argument values */
    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) {
        return;
    } else if(pBiDi==NULL || text==NULL ||
              ((UBIDI_MAX_EXPLICIT_LEVEL<paraLevel) && !IS_DEFAULT_LEVEL(paraLevel)) ||
              length<-1
    ) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return;
    }

    if(length==-1) {
        // length=u_strlen(text);
                const UChar *p = text - 1;
                while(*++p);
                length = p - text;
    }

    /* initialize the UBiDi structure */
    pBiDi->text=text;
    pBiDi->length=length;
    pBiDi->paraLevel=paraLevel;
    pBiDi->direction=UBIDI_LTR;
    pBiDi->trailingWSStart=length;  /* the levels[] will reflect the WS run */

    pBiDi->dirProps=NULL;
    pBiDi->levels=NULL;
    pBiDi->runs=NULL;

    if(length==0) {
        /*
         * For an empty paragraph, create a UBiDi object with the paraLevel and
         * the flags and the direction set but without allocating zero-length arrays.
         * There is nothing more to do.
         */
        if(IS_DEFAULT_LEVEL(paraLevel)) {
            pBiDi->paraLevel&=1;
        }
        if(paraLevel&1) {
            pBiDi->flags=DIRPROP_FLAG(R);
            pBiDi->direction=UBIDI_RTL;
        } else {
            pBiDi->flags=DIRPROP_FLAG(L);
            pBiDi->direction=UBIDI_LTR;
        }

        pBiDi->runCount=0;
        return;
    }

    pBiDi->runCount=-1;

    /*
     * Get the directional properties,
     * the flags bit-set, and
     * determine the partagraph level if necessary.
     */
    if(getDirPropsMemory(pBiDi, length)) {
        pBiDi->dirProps=pBiDi->dirPropsMemory;
        getDirProps(pBiDi, text);
    } else {
        *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
        return;
    }

    if (getLevelsMemory(pBiDi, length)) {
        pBiDi->levels=pBiDi->levelsMemory;
        /* are explicit levels specified? */
        if(embeddingLevels==NULL) {
            /* no: determine explicit levels according to the (Xn) rules */
            direction=resolveExplicitLevels(pBiDi);
        } else {
            /* set BN for all explicit codes, check that all levels are paraLevel..UBIDI_MAX_EXPLICIT_LEVEL */
            icu_memcpy(pBiDi->levels, embeddingLevels, length);
            direction=checkExplicitLevels(pBiDi, pErrorCode);
            if(U_FAILURE(*pErrorCode)) {
                 return;
            }
        }
    } else {
        *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
        return;
    }

    /*
     * The steps after (X9) in the UBiDi algorithm are performed only if
     * the paragraph text has mixed directionality!
     */
    pBiDi->direction=direction;
    switch(direction) {
    case UBIDI_LTR:
        /* make sure paraLevel is even */
        pBiDi->paraLevel=(UBiDiLevel)((pBiDi->paraLevel+1)&~1);

        /* all levels are implicitly at paraLevel (important for ubidi_getLevels()) */
        pBiDi->trailingWSStart=0;
        break;
    case UBIDI_RTL:
        /* make sure paraLevel is odd */
        pBiDi->paraLevel|=1;

        /* all levels are implicitly at paraLevel (important for ubidi_getLevels()) */
        pBiDi->trailingWSStart=0;
        break;
    default:
        /*
         * If there are no external levels specified and there
         * are no significant explicit level codes in the text,
         * then we can treat the entire paragraph as one run.
         * Otherwise, we need to perform the following rules on runs of
         * the text with the same embedding levels. (X10)
         * "Significant" explicit level codes are ones that actually
         * affect non-BN characters.
         * Examples for "insignificant" ones are empty embeddings
         * LRE-PDF, LRE-RLE-PDF-PDF, etc.
         */
        if(embeddingLevels==NULL && !(pBiDi->flags&DIRPROP_FLAG_MULTI_RUNS)) {
            resolveImplicitLevels(pBiDi, 0, length,
                                    GET_LR_FROM_LEVEL(pBiDi->paraLevel),
                                    GET_LR_FROM_LEVEL(pBiDi->paraLevel));
        } else {
            /* sor, eor: start and end types of same-level-run */
            UBiDiLevel *levels=pBiDi->levels;
            int32_t start, limit=0;
            UBiDiLevel level, nextLevel;
            DirProp sor, eor;

            /* determine the first sor and set eor to it because of the loop body (sor=eor there) */
            level=pBiDi->paraLevel;
            nextLevel=levels[0];
            if(level<nextLevel) {
                eor=GET_LR_FROM_LEVEL(nextLevel);
            } else {
                eor=GET_LR_FROM_LEVEL(level);
            }

            do {
                /* determine start and limit of the run (end points just behind the run) */

                /* the values for this run's start are the same as for the previous run's end */
                sor=eor;
                start=limit;
                level=nextLevel;

                /* search for the limit of this run */
                while(++limit<length && levels[limit]==level) {}

                /* get the correct level of the next run */
                if(limit<length) {
                    nextLevel=levels[limit];
                } else {
                    nextLevel=pBiDi->paraLevel;
                }

                /* determine eor from max(level, nextLevel); sor is last run's eor */
                if((level&~UBIDI_LEVEL_OVERRIDE)<(nextLevel&~UBIDI_LEVEL_OVERRIDE)) {
                    eor=GET_LR_FROM_LEVEL(nextLevel);
                } else {
                    eor=GET_LR_FROM_LEVEL(level);
                }

                /* if the run consists of overridden directional types, then there
                   are no implicit types to be resolved */
                if(!(level&UBIDI_LEVEL_OVERRIDE)) {
                    resolveImplicitLevels(pBiDi, start, limit, sor, eor);
                } else {
                    /* remove the UBIDI_LEVEL_OVERRIDE flags */
                    do {
                        levels[start++]&=~UBIDI_LEVEL_OVERRIDE;
                    } while(start<limit);
                }
            } while(limit<length);
        }

        /* reset the embedding levels for some non-graphic characters (L1), (X9) */
        adjustWSLevels(pBiDi);

        /* for "inverse BiDi", ubidi_getRuns() modifies the levels of numeric runs following RTL runs */
        if(pBiDi->isInverse) {
            if(!ubidi_getRuns(pBiDi)) {
                *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
                return;
            }
        }
        break;
    }
}