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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
* Copyright (c) 1996-2014, International Business Machines
* Corporation and others. All Rights Reserved.
******************************************************************************
* File unorm.cpp
*
* Created by: Vladimir Weinstein 12052000
*
* Modification history :
*
* Date Name Description
* 02/01/01 synwee Added normalization quickcheck enum and method.
* 02/12/01 synwee Commented out quickcheck util api has been approved
* Added private method for doing FCD checks
* 02/23/01 synwee Modified quickcheck and checkFCE to run through
* string for codepoints < 0x300 for the normalization
* mode NFC.
* 05/25/01+ Markus Scherer total rewrite, implement all normalization here
* instead of just wrappers around normlzr.cpp,
* load unorm.dat, support Unicode 3.1 with
* supplementary code points, etc.
* 2009-nov..2010-jan Markus Scherer total rewrite, new Normalizer2 API & code
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_NORMALIZATION
#include "unicode/udata.h"
#include "unicode/ustring.h"
#include "unicode/uiter.h"
#include "unicode/unorm.h"
#include "unicode/unorm2.h"
#include "normalizer2impl.h"
#include "unormimp.h"
#include "uprops.h"
#include "ustr_imp.h"
U_NAMESPACE_USE
/* quick check functions ---------------------------------------------------- */
U_CAPI UNormalizationCheckResult U_EXPORT2
unorm_quickCheck(const char16_t *src,
int32_t srcLength,
UNormalizationMode mode,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
return unorm2_quickCheck((const UNormalizer2 *)n2, src, srcLength, pErrorCode);
}
U_CAPI UNormalizationCheckResult U_EXPORT2
unorm_quickCheckWithOptions(const char16_t *src, int32_t srcLength,
UNormalizationMode mode, int32_t options,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
if(options&UNORM_UNICODE_3_2) {
FilteredNormalizer2 fn2(*n2, *uniset_getUnicode32Instance(*pErrorCode));
return unorm2_quickCheck(
reinterpret_cast<const UNormalizer2 *>(static_cast<Normalizer2 *>(&fn2)),
src, srcLength, pErrorCode);
} else {
return unorm2_quickCheck((const UNormalizer2 *)n2, src, srcLength, pErrorCode);
}
}
U_CAPI UBool U_EXPORT2
unorm_isNormalized(const char16_t *src, int32_t srcLength,
UNormalizationMode mode,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
return unorm2_isNormalized((const UNormalizer2 *)n2, src, srcLength, pErrorCode);
}
U_CAPI UBool U_EXPORT2
unorm_isNormalizedWithOptions(const char16_t *src, int32_t srcLength,
UNormalizationMode mode, int32_t options,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
if(options&UNORM_UNICODE_3_2) {
FilteredNormalizer2 fn2(*n2, *uniset_getUnicode32Instance(*pErrorCode));
return unorm2_isNormalized(
reinterpret_cast<const UNormalizer2 *>(static_cast<Normalizer2 *>(&fn2)),
src, srcLength, pErrorCode);
} else {
return unorm2_isNormalized((const UNormalizer2 *)n2, src, srcLength, pErrorCode);
}
}
/* normalize() API ---------------------------------------------------------- */
/** Public API for normalizing. */
U_CAPI int32_t U_EXPORT2
unorm_normalize(const char16_t *src, int32_t srcLength,
UNormalizationMode mode, int32_t options,
char16_t *dest, int32_t destCapacity,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
if(options&UNORM_UNICODE_3_2) {
FilteredNormalizer2 fn2(*n2, *uniset_getUnicode32Instance(*pErrorCode));
return unorm2_normalize(
reinterpret_cast<const UNormalizer2 *>(static_cast<Normalizer2 *>(&fn2)),
src, srcLength, dest, destCapacity, pErrorCode);
} else {
return unorm2_normalize((const UNormalizer2 *)n2,
src, srcLength, dest, destCapacity, pErrorCode);
}
}
/* iteration functions ------------------------------------------------------ */
static int32_t
_iterate(UCharIterator *src, UBool forward,
char16_t *dest, int32_t destCapacity,
const Normalizer2 *n2,
UBool doNormalize, UBool *pNeededToNormalize,
UErrorCode *pErrorCode) {
if(U_FAILURE(*pErrorCode)) {
return 0;
}
if(destCapacity<0 || (dest==nullptr && destCapacity>0) || src==nullptr) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
if(pNeededToNormalize!=nullptr) {
*pNeededToNormalize=false;
}
if(!(forward ? src->hasNext(src) : src->hasPrevious(src))) {
return u_terminateUChars(dest, destCapacity, 0, pErrorCode);
}
UnicodeString buffer;
UChar32 c;
if(forward) {
/* get one character and ignore its properties */
buffer.append(uiter_next32(src));
/* get all following characters until we see a boundary */
while((c=uiter_next32(src))>=0) {
if(n2->hasBoundaryBefore(c)) {
/* back out the latest movement to stop at the boundary */
src->move(src, -U16_LENGTH(c), UITER_CURRENT);
break;
} else {
buffer.append(c);
}
}
} else {
while((c=uiter_previous32(src))>=0) {
/* always write this character to the front of the buffer */
buffer.insert(0, c);
/* stop if this just-copied character is a boundary */
if(n2->hasBoundaryBefore(c)) {
break;
}
}
}
UnicodeString destString(dest, 0, destCapacity);
if(buffer.length()>0 && doNormalize) {
n2->normalize(buffer, destString, *pErrorCode).extract(dest, destCapacity, *pErrorCode);
if(pNeededToNormalize!=nullptr && U_SUCCESS(*pErrorCode)) {
*pNeededToNormalize= destString!=buffer;
}
return destString.length();
} else {
/* just copy the source characters */
return buffer.extract(dest, destCapacity, *pErrorCode);
}
}
static int32_t
unorm_iterate(UCharIterator *src, UBool forward,
char16_t *dest, int32_t destCapacity,
UNormalizationMode mode, int32_t options,
UBool doNormalize, UBool *pNeededToNormalize,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
if(options&UNORM_UNICODE_3_2) {
const UnicodeSet *uni32 = uniset_getUnicode32Instance(*pErrorCode);
if(U_FAILURE(*pErrorCode)) {
return 0;
}
FilteredNormalizer2 fn2(*n2, *uni32);
return _iterate(src, forward, dest, destCapacity,
&fn2, doNormalize, pNeededToNormalize, pErrorCode);
}
return _iterate(src, forward, dest, destCapacity,
n2, doNormalize, pNeededToNormalize, pErrorCode);
}
U_CAPI int32_t U_EXPORT2
unorm_previous(UCharIterator *src,
char16_t *dest, int32_t destCapacity,
UNormalizationMode mode, int32_t options,
UBool doNormalize, UBool *pNeededToNormalize,
UErrorCode *pErrorCode) {
return unorm_iterate(src, false,
dest, destCapacity,
mode, options,
doNormalize, pNeededToNormalize,
pErrorCode);
}
U_CAPI int32_t U_EXPORT2
unorm_next(UCharIterator *src,
char16_t *dest, int32_t destCapacity,
UNormalizationMode mode, int32_t options,
UBool doNormalize, UBool *pNeededToNormalize,
UErrorCode *pErrorCode) {
return unorm_iterate(src, true,
dest, destCapacity,
mode, options,
doNormalize, pNeededToNormalize,
pErrorCode);
}
/* Concatenation of normalized strings -------------------------------------- */
static int32_t
_concatenate(const char16_t *left, int32_t leftLength,
const char16_t *right, int32_t rightLength,
char16_t *dest, int32_t destCapacity,
const Normalizer2 *n2,
UErrorCode *pErrorCode) {
if(U_FAILURE(*pErrorCode)) {
return 0;
}
if(destCapacity<0 || (dest==nullptr && destCapacity>0) ||
left==nullptr || leftLength<-1 || right==nullptr || rightLength<-1) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* check for overlapping right and destination */
if( dest!=nullptr &&
((right>=dest && right<(dest+destCapacity)) ||
(rightLength>0 && dest>=right && dest<(right+rightLength)))
) {
*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
/* allow left==dest */
UnicodeString destString;
if(left==dest) {
destString.setTo(dest, leftLength, destCapacity);
} else {
destString.setTo(dest, 0, destCapacity);
destString.append(left, leftLength);
}
return n2->append(destString, UnicodeString(rightLength<0, right, rightLength), *pErrorCode).
extract(dest, destCapacity, *pErrorCode);
}
U_CAPI int32_t U_EXPORT2
unorm_concatenate(const char16_t *left, int32_t leftLength,
const char16_t *right, int32_t rightLength,
char16_t *dest, int32_t destCapacity,
UNormalizationMode mode, int32_t options,
UErrorCode *pErrorCode) {
const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, *pErrorCode);
if(options&UNORM_UNICODE_3_2) {
const UnicodeSet *uni32 = uniset_getUnicode32Instance(*pErrorCode);
if(U_FAILURE(*pErrorCode)) {
return 0;
}
FilteredNormalizer2 fn2(*n2, *uni32);
return _concatenate(left, leftLength, right, rightLength,
dest, destCapacity, &fn2, pErrorCode);
}
return _concatenate(left, leftLength, right, rightLength,
dest, destCapacity, n2, pErrorCode);
}
#endif /* #if !UCONFIG_NO_NORMALIZATION */
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