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