523 lines
14 KiB
C++
523 lines
14 KiB
C++
/*
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*************************************************************************
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* COPYRIGHT:
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* Copyright (c) 1996-2010, International Business Machines Corporation and
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* others. All Rights Reserved.
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*************************************************************************
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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/uniset.h"
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#include "unicode/unistr.h"
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#include "unicode/chariter.h"
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#include "unicode/schriter.h"
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#include "unicode/uchriter.h"
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#include "unicode/normlzr.h"
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#include "cmemory.h"
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#include "normalizer2impl.h"
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#include "uprops.h" // for uniset_getUnicode32Instance()
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(Normalizer)
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//-------------------------------------------------------------------------
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// Constructors and other boilerplate
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//-------------------------------------------------------------------------
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Normalizer::Normalizer(const UnicodeString& str, UNormalizationMode mode) :
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UObject(), fFilteredNorm2(NULL), fNorm2(NULL), fUMode(mode), fOptions(0),
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text(new StringCharacterIterator(str)),
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currentIndex(0), nextIndex(0),
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buffer(), bufferPos(0)
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{
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init();
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}
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Normalizer::Normalizer(const UChar *str, int32_t length, UNormalizationMode mode) :
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UObject(), fFilteredNorm2(NULL), fNorm2(NULL), fUMode(mode), fOptions(0),
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text(new UCharCharacterIterator(str, length)),
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currentIndex(0), nextIndex(0),
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buffer(), bufferPos(0)
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{
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init();
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}
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Normalizer::Normalizer(const CharacterIterator& iter, UNormalizationMode mode) :
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UObject(), fFilteredNorm2(NULL), fNorm2(NULL), fUMode(mode), fOptions(0),
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text(iter.clone()),
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currentIndex(0), nextIndex(0),
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buffer(), bufferPos(0)
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{
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init();
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}
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Normalizer::Normalizer(const Normalizer ©) :
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UObject(copy), fFilteredNorm2(NULL), fNorm2(NULL), fUMode(copy.fUMode), fOptions(copy.fOptions),
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text(copy.text->clone()),
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currentIndex(copy.currentIndex), nextIndex(copy.nextIndex),
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buffer(copy.buffer), bufferPos(copy.bufferPos)
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{
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init();
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}
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static const UChar _NUL=0;
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void
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Normalizer::init() {
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UErrorCode errorCode=U_ZERO_ERROR;
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fNorm2=Normalizer2Factory::getInstance(fUMode, errorCode);
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if(fOptions&UNORM_UNICODE_3_2) {
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delete fFilteredNorm2;
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fNorm2=fFilteredNorm2=
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new FilteredNormalizer2(*fNorm2, *uniset_getUnicode32Instance(errorCode));
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}
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if(U_FAILURE(errorCode)) {
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errorCode=U_ZERO_ERROR;
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fNorm2=Normalizer2Factory::getNoopInstance(errorCode);
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}
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}
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Normalizer::~Normalizer()
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{
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delete fFilteredNorm2;
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delete text;
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}
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Normalizer*
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Normalizer::clone() const
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{
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return new Normalizer(*this);
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}
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/**
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* Generates a hash code for this iterator.
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*/
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int32_t Normalizer::hashCode() const
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{
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return text->hashCode() + fUMode + fOptions + buffer.hashCode() + bufferPos + currentIndex + nextIndex;
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}
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UBool Normalizer::operator==(const Normalizer& that) const
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{
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return
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this==&that ||
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(fUMode==that.fUMode &&
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fOptions==that.fOptions &&
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*text==*that.text &&
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buffer==that.buffer &&
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bufferPos==that.bufferPos &&
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nextIndex==that.nextIndex);
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}
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//-------------------------------------------------------------------------
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// Static utility methods
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//-------------------------------------------------------------------------
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void U_EXPORT2
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Normalizer::normalize(const UnicodeString& source,
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UNormalizationMode mode, int32_t options,
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UnicodeString& result,
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UErrorCode &status) {
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if(source.isBogus() || U_FAILURE(status)) {
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result.setToBogus();
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if(U_SUCCESS(status)) {
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status=U_ILLEGAL_ARGUMENT_ERROR;
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}
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} else {
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UnicodeString localDest;
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UnicodeString *dest;
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if(&source!=&result) {
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dest=&result;
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} else {
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// the source and result strings are the same object, use a temporary one
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dest=&localDest;
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}
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const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, status);
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if(U_SUCCESS(status)) {
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if(options&UNORM_UNICODE_3_2) {
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FilteredNormalizer2(*n2, *uniset_getUnicode32Instance(status)).
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normalize(source, *dest, status);
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} else {
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n2->normalize(source, *dest, status);
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}
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}
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if(dest==&localDest && U_SUCCESS(status)) {
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result=*dest;
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}
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}
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}
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void U_EXPORT2
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Normalizer::compose(const UnicodeString& source,
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UBool compat, int32_t options,
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UnicodeString& result,
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UErrorCode &status) {
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normalize(source, compat ? UNORM_NFKC : UNORM_NFC, options, result, status);
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}
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void U_EXPORT2
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Normalizer::decompose(const UnicodeString& source,
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UBool compat, int32_t options,
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UnicodeString& result,
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UErrorCode &status) {
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normalize(source, compat ? UNORM_NFKD : UNORM_NFD, options, result, status);
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}
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UNormalizationCheckResult
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Normalizer::quickCheck(const UnicodeString& source,
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UNormalizationMode mode, int32_t options,
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UErrorCode &status) {
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const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, status);
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if(U_SUCCESS(status)) {
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if(options&UNORM_UNICODE_3_2) {
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return FilteredNormalizer2(*n2, *uniset_getUnicode32Instance(status)).
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quickCheck(source, status);
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} else {
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return n2->quickCheck(source, status);
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}
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} else {
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return UNORM_MAYBE;
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}
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}
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UBool
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Normalizer::isNormalized(const UnicodeString& source,
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UNormalizationMode mode, int32_t options,
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UErrorCode &status) {
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const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, status);
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if(U_SUCCESS(status)) {
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if(options&UNORM_UNICODE_3_2) {
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return FilteredNormalizer2(*n2, *uniset_getUnicode32Instance(status)).
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isNormalized(source, status);
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} else {
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return n2->isNormalized(source, status);
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}
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} else {
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return FALSE;
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}
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}
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UnicodeString & U_EXPORT2
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Normalizer::concatenate(UnicodeString &left, UnicodeString &right,
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UnicodeString &result,
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UNormalizationMode mode, int32_t options,
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UErrorCode &errorCode) {
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if(left.isBogus() || right.isBogus() || U_FAILURE(errorCode)) {
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result.setToBogus();
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if(U_SUCCESS(errorCode)) {
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errorCode=U_ILLEGAL_ARGUMENT_ERROR;
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}
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} else {
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UnicodeString localDest;
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UnicodeString *dest;
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if(&right!=&result) {
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dest=&result;
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} else {
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// the right and result strings are the same object, use a temporary one
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dest=&localDest;
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}
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*dest=left;
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const Normalizer2 *n2=Normalizer2Factory::getInstance(mode, errorCode);
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if(U_SUCCESS(errorCode)) {
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if(options&UNORM_UNICODE_3_2) {
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FilteredNormalizer2(*n2, *uniset_getUnicode32Instance(errorCode)).
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append(*dest, right, errorCode);
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} else {
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n2->append(*dest, right, errorCode);
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}
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}
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if(dest==&localDest && U_SUCCESS(errorCode)) {
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result=*dest;
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}
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}
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return result;
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}
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//-------------------------------------------------------------------------
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// Iteration API
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//-------------------------------------------------------------------------
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/**
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* Return the current character in the normalized text.
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*/
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UChar32 Normalizer::current() {
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if(bufferPos<buffer.length() || nextNormalize()) {
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return buffer.char32At(bufferPos);
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} else {
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return DONE;
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}
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}
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/**
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* Return the next character in the normalized text and advance
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* the iteration position by one. If the end
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* of the text has already been reached, {@link #DONE} is returned.
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*/
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UChar32 Normalizer::next() {
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if(bufferPos<buffer.length() || nextNormalize()) {
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UChar32 c=buffer.char32At(bufferPos);
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bufferPos+=UTF_CHAR_LENGTH(c);
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return c;
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} else {
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return DONE;
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}
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}
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/**
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* Return the previous character in the normalized text and decrement
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* the iteration position by one. If the beginning
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* of the text has already been reached, {@link #DONE} is returned.
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*/
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UChar32 Normalizer::previous() {
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if(bufferPos>0 || previousNormalize()) {
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UChar32 c=buffer.char32At(bufferPos-1);
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bufferPos-=UTF_CHAR_LENGTH(c);
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return c;
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} else {
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return DONE;
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}
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}
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void Normalizer::reset() {
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currentIndex=nextIndex=text->setToStart();
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clearBuffer();
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}
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void
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Normalizer::setIndexOnly(int32_t index) {
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text->setIndex(index); // pins index
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currentIndex=nextIndex=text->getIndex();
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clearBuffer();
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}
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/**
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* Return the first character in the normalized text. This resets
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* the <tt>Normalizer's</tt> position to the beginning of the text.
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*/
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UChar32 Normalizer::first() {
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reset();
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return next();
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}
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/**
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* Return the last character in the normalized text. This resets
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* the <tt>Normalizer's</tt> position to be just before the
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* the input text corresponding to that normalized character.
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*/
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UChar32 Normalizer::last() {
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currentIndex=nextIndex=text->setToEnd();
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clearBuffer();
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return previous();
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}
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/**
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* Retrieve the current iteration position in the input text that is
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* being normalized. This method is useful in applications such as
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* searching, where you need to be able to determine the position in
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* the input text that corresponds to a given normalized output character.
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* <p>
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* <b>Note:</b> This method sets the position in the <em>input</em>, while
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* {@link #next} and {@link #previous} iterate through characters in the
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* <em>output</em>. This means that there is not necessarily a one-to-one
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* correspondence between characters returned by <tt>next</tt> and
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* <tt>previous</tt> and the indices passed to and returned from
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* <tt>setIndex</tt> and {@link #getIndex}.
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*
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*/
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int32_t Normalizer::getIndex() const {
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if(bufferPos<buffer.length()) {
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return currentIndex;
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} else {
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return nextIndex;
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}
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}
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/**
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* Retrieve the index of the start of the input text. This is the begin index
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* of the <tt>CharacterIterator</tt> or the start (i.e. 0) of the <tt>String</tt>
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* over which this <tt>Normalizer</tt> is iterating
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*/
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int32_t Normalizer::startIndex() const {
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return text->startIndex();
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}
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/**
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* Retrieve the index of the end of the input text. This is the end index
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* of the <tt>CharacterIterator</tt> or the length of the <tt>String</tt>
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* over which this <tt>Normalizer</tt> is iterating
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*/
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int32_t Normalizer::endIndex() const {
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return text->endIndex();
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}
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//-------------------------------------------------------------------------
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// Property access methods
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//-------------------------------------------------------------------------
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void
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Normalizer::setMode(UNormalizationMode newMode)
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{
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fUMode = newMode;
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init();
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}
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UNormalizationMode
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Normalizer::getUMode() const
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{
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return fUMode;
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}
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void
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Normalizer::setOption(int32_t option,
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UBool value)
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{
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if (value) {
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fOptions |= option;
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} else {
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fOptions &= (~option);
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}
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init();
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}
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UBool
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Normalizer::getOption(int32_t option) const
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{
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return (fOptions & option) != 0;
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}
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/**
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* Set the input text over which this <tt>Normalizer</tt> will iterate.
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* The iteration position is set to the beginning of the input text.
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*/
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void
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Normalizer::setText(const UnicodeString& newText,
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UErrorCode &status)
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{
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if (U_FAILURE(status)) {
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return;
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}
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CharacterIterator *newIter = new StringCharacterIterator(newText);
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if (newIter == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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delete text;
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text = newIter;
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reset();
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}
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/**
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* Set the input text over which this <tt>Normalizer</tt> will iterate.
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* The iteration position is set to the beginning of the string.
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*/
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void
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Normalizer::setText(const CharacterIterator& newText,
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UErrorCode &status)
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{
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if (U_FAILURE(status)) {
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return;
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}
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CharacterIterator *newIter = newText.clone();
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if (newIter == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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delete text;
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text = newIter;
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reset();
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}
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void
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Normalizer::setText(const UChar* newText,
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int32_t length,
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UErrorCode &status)
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{
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if (U_FAILURE(status)) {
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return;
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}
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CharacterIterator *newIter = new UCharCharacterIterator(newText, length);
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if (newIter == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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delete text;
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text = newIter;
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reset();
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}
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/**
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* Copies the text under iteration into the UnicodeString referred to by "result".
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* @param result Receives a copy of the text under iteration.
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*/
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void
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Normalizer::getText(UnicodeString& result)
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{
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text->getText(result);
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}
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//-------------------------------------------------------------------------
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// Private utility methods
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//-------------------------------------------------------------------------
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void Normalizer::clearBuffer() {
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buffer.remove();
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bufferPos=0;
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}
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UBool
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Normalizer::nextNormalize() {
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clearBuffer();
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currentIndex=nextIndex;
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text->setIndex(nextIndex);
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if(!text->hasNext()) {
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return FALSE;
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}
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// Skip at least one character so we make progress.
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UnicodeString segment(text->next32PostInc());
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while(text->hasNext()) {
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UChar32 c;
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if(fNorm2->hasBoundaryBefore(c=text->next32PostInc())) {
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text->move32(-1, CharacterIterator::kCurrent);
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break;
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}
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segment.append(c);
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}
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nextIndex=text->getIndex();
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UErrorCode errorCode=U_ZERO_ERROR;
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fNorm2->normalize(segment, buffer, errorCode);
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return U_SUCCESS(errorCode) && !buffer.isEmpty();
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}
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UBool
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Normalizer::previousNormalize() {
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clearBuffer();
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nextIndex=currentIndex;
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text->setIndex(currentIndex);
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if(!text->hasPrevious()) {
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return FALSE;
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}
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UnicodeString segment;
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while(text->hasPrevious()) {
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UChar32 c=text->previous32();
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segment.insert(0, c);
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if(fNorm2->hasBoundaryBefore(c)) {
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break;
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}
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}
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currentIndex=text->getIndex();
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UErrorCode errorCode=U_ZERO_ERROR;
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fNorm2->normalize(segment, buffer, errorCode);
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bufferPos=buffer.length();
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return U_SUCCESS(errorCode) && !buffer.isEmpty();
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_NORMALIZATION */
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