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ICU-1682 provide direct access to decomposition of a code point - unorm_getDecomposition

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X-SVN-Rev: 8154
This commit is contained in:
Markus Scherer 2002-03-20 18:24:02 +00:00
parent 1109f198e6
commit b7682efdab
2 changed files with 94 additions and 0 deletions
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86
icu4c/source/common/unorm.cpp
View file

@ -1010,6 +1010,92 @@ unorm_quickCheck(const UChar *src,
/* make NFD & NFKD ---------------------------------------------------------- */
U_CAPI int32_t U_EXPORT2
unorm_getDecomposition(UChar32 c, UBool compat,
UChar *dest, int32_t destCapacity) {
UErrorCode errorCode=U_ZERO_ERROR;
if( (uint32_t)c<=0x10ffff &&
_haveData(errorCode) &&
((dest!=NULL && destCapacity>0) || destCapacity==0)
) {
uint32_t norm32, qcMask;
UChar32 minNoMaybe;
int32_t length;
/* initialize */
if(!compat) {
minNoMaybe=(UChar32)indexes[_NORM_INDEX_MIN_NFD_NO_MAYBE];
qcMask=_NORM_QC_NFD;
} else {
minNoMaybe=(UChar32)indexes[_NORM_INDEX_MIN_NFKD_NO_MAYBE];
qcMask=_NORM_QC_NFKD;
}
if(c<minNoMaybe) {
/* trivial case */
if(destCapacity>0) {
dest[0]=(UChar)c;
}
return -1;
}
/* data lookup */
UTRIE_GET32(&normTrie, c, norm32);
if((norm32&qcMask)==0) {
/* simple case: no decomposition */
if(c<=0xffff) {
if(destCapacity>0) {
dest[0]=(UChar)c;
}
return -1;
} else {
if(destCapacity>=2) {
dest[0]=UTF16_LEAD(c);
dest[1]=UTF16_TRAIL(c);
}
return -2;
}
} else if(isNorm32HangulOrJamo(norm32)) {
/* Hangul syllable: decompose algorithmically */
UChar c2;
c-=HANGUL_BASE;
c2=(UChar)(c%JAMO_T_COUNT);
c/=JAMO_T_COUNT;
if(c2>0) {
if(destCapacity>=3) {
dest[2]=(UChar)(JAMO_T_BASE+c2);
}
length=3;
} else {
length=2;
}
if(destCapacity>=2) {
dest[1]=(UChar)(JAMO_V_BASE+c%JAMO_V_COUNT);
dest[0]=(UChar)(JAMO_L_BASE+c/JAMO_V_COUNT);
}
return length;
} else {
/* c decomposes, get everything from the variable-length extra data */
const UChar *p, *limit;
uint8_t cc, trailCC;
p=_decompose(norm32, qcMask, length, cc, trailCC);
if(length<=destCapacity) {
limit=p+length;
do {
*dest++=*p++;
} while(p<limit);
}
return length;
}
} else {
return 0;
}
}
static int32_t
_decompose(UChar *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,

8
icu4c/source/common/unormimp.h
View file

@ -255,6 +255,14 @@ U_NAMESPACE_END
#endif
/**
* internal API, used by the canonical iterator
* @internal
*/
U_CAPI int32_t U_EXPORT2
unorm_getDecomposition(UChar32 c, UBool compat,
UChar *dest, int32_t destCapacity);
/**
* internal API, used by uprops.cpp
* @internal