531 lines
16 KiB
C++
531 lines
16 KiB
C++
/*
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*************************************************************************
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* COPYRIGHT:
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* Copyright (c) 1996-2001, 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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/*
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* Modification history
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*
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* Date Name Description
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* 02/02/01 synwee Added converters from EMode to UNormalizationMode,
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* getUNormalizationMode and getNormalizerEMode,
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* useful in tbcoll and unorm.
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* Added quickcheck method and incorporated it into
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* normalize()
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* 06/20/01+ Markus Scherer
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* total rewrite, implement all normalization in unorm.cpp
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* and turn Normalizer into a wrapper;
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* fix the very broken iteration API
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*/
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#include "unicode/normlzr.h"
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#include "unicode/utypes.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 "unormimp.h"
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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,
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EMode mode) :
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fMode(mode), fOptions(0),
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text(new StringCharacterIterator(str)), nextIndex(-1),
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buffer(), bufferPos(0)
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{
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checkData();
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}
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Normalizer::Normalizer(const UnicodeString& str,
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EMode mode,
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int32_t options) :
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fMode(mode), fOptions(options),
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text(new StringCharacterIterator(str)), nextIndex(-1),
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buffer(), bufferPos(0)
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{
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checkData();
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}
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Normalizer::Normalizer(const UChar *str, int32_t length, EMode mode) :
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fMode(mode), fOptions(0),
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text(new UCharCharacterIterator(str, length)), nextIndex(-1),
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buffer(), bufferPos(0)
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{
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checkData();
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}
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Normalizer::Normalizer(const CharacterIterator& iter,
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EMode mode) :
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fMode(mode), fOptions(0),
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text(iter.clone()), nextIndex(-1),
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buffer(), bufferPos(0)
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{
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checkData();
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}
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Normalizer::Normalizer(const CharacterIterator& iter,
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EMode mode,
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int32_t options) :
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fMode(mode), fOptions(options),
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text(iter.clone()), nextIndex(-1),
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buffer(), bufferPos(0)
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{
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checkData();
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}
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Normalizer::Normalizer(const Normalizer ©) :
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fMode(copy.fMode), fOptions(copy.fOptions),
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text(copy.text->clone()), nextIndex(copy.nextIndex),
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buffer(copy.buffer), bufferPos(copy.bufferPos)
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{
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checkData();
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}
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static const UChar _NUL=0;
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void
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Normalizer::checkData() {
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UErrorCode errorCode=U_ZERO_ERROR;
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if(!unorm_haveData(&errorCode)) {
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delete text;
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text=new UCharCharacterIterator(&_NUL, 0);
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}
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}
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Normalizer::~Normalizer()
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{
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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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if(this!=0) {
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return new Normalizer(*this);
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} else {
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return 0;
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}
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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() + fMode + fOptions + buffer.hashCode() + bufferPos + 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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fMode==that.fMode &&
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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
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Normalizer::normalize(const UnicodeString& source,
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EMode mode,
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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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} else {
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/* make sure that we do not operate on the same buffer in source and result */
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result.cloneArrayIfNeeded(-1, source.length()+20, FALSE);
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result.fLength=unorm_internalNormalize(result.fArray, result.fCapacity,
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source.fArray, source.fLength,
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getUNormalizationMode(mode, status), (options&IGNORE_HANGUL)!=0,
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UnicodeString::growBuffer, &result,
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&status);
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if(U_FAILURE(status)) {
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result.setToBogus();
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}
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}
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}
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UNormalizationCheckResult
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Normalizer::quickCheck(const UnicodeString& source,
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Normalizer::EMode mode,
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UErrorCode &status) {
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if(U_FAILURE(status)) {
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return UNORM_MAYBE;
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}
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return unorm_quickCheck(source.fArray, source.length(),
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getUNormalizationMode(mode, status), &status);
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}
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void
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Normalizer::compose(const UnicodeString& source,
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UBool compat,
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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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} else {
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/* make sure that we do not operate on the same buffer in source and result */
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result.cloneArrayIfNeeded(-1, source.length()+20, FALSE);
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result.fLength=unorm_compose(result.fArray, result.fCapacity,
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source.fArray, source.fLength,
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compat, (options&IGNORE_HANGUL)!=0,
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UnicodeString::growBuffer, &result,
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&status);
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if(U_FAILURE(status)) {
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result.setToBogus();
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}
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}
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}
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void
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Normalizer::decompose(const UnicodeString& source,
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UBool compat,
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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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} else {
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/* make sure that we do not operate on the same buffer in source and result */
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result.cloneArrayIfNeeded(-1, source.length()+20, FALSE);
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result.fLength=unorm_decompose(result.fArray, result.fCapacity,
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source.fArray, source.fLength,
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compat, (options&IGNORE_HANGUL)!=0,
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UnicodeString::growBuffer, &result,
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&status);
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if(U_FAILURE(status)) {
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result.setToBogus();
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}
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}
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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()) {
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return buffer.char32At(bufferPos);
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} else {
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/*
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* Normalize from the current index,
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* return the first character from there, and
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* reset the character iterator to the original index.
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* Set nextIndex to where the iterator stopped so
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* that next() can later continue from there.
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*/
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UTextOffset currentIndex=text->getIndex();
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UChar32 c;
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if(nextNormalize()) {
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c=buffer.char32At(bufferPos);
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nextIndex=text->getIndex();
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} else {
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c=DONE;
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}
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text->setIndex(currentIndex);
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return c;
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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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UChar32 c;
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if(bufferPos<buffer.length()) {
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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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/*
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* If the buffer (which is now exhausted) was normalized
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* during current() or setIndex() then the character iterator
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* must be set to behind what was normalized then
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* in order to continue with the following text.
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* That "position behind what was normalized" is nextIndex.
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*/
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if(nextIndex>=0) {
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text->setIndex(nextIndex);
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}
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if(text->hasNext() && nextNormalize()) {
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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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/**
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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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UChar32 c;
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if(bufferPos>0 || text->hasPrevious() && previousNormalize()) {
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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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text->setToStart();
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clearBuffer();
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}
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void
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Normalizer::setIndexOnly(UTextOffset index) {
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text->setIndex(index);
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clearBuffer();
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}
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/**
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* Set the iteration position in the input text that is being normalized
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* and return the first normalized character at that position.
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* <p>
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* <b>Note:</b> This method sets the position in the <em>input</em> text,
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* while {@link #next} and {@link #previous} iterate through characters
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* in the normalized <em>output</em>. This means that there is not
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* necessarily a one-to-one correspondence between characters returned
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* by <tt>next</tt> and <tt>previous</tt> and the indices passed to and
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* returned from <tt>setIndex</tt> and {@link #getIndex}.
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* <p>
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* @param index the desired index in the input text.
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*
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* @return the first normalized character that is the result of iterating
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* forward starting at the given index.
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*
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* @throws IllegalArgumentException if the given index is less than
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* {@link #getBeginIndex} or greater than {@link #getEndIndex}.
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*/
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UChar32 Normalizer::setIndex(UTextOffset index) {
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setIndexOnly(index);
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return current();
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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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text->setToStart();
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clearBuffer();
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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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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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UTextOffset Normalizer::getIndex() const {
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return text->getIndex();
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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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UTextOffset 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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UTextOffset 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(EMode newMode)
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{
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fMode = newMode;
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}
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Normalizer::EMode
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Normalizer::getMode() const
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{
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return fMode;
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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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}
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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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nextIndex=-1;
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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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UErrorCode errorCode=U_ZERO_ERROR;
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clearBuffer();
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buffer.fLength=unorm_nextNormalize(buffer.fArray, buffer.fCapacity, *text,
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getUNormalizationMode(fMode, errorCode),
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(fOptions&IGNORE_HANGUL)!=0,
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UnicodeString::growBuffer, &buffer,
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&errorCode);
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return U_SUCCESS(errorCode) && buffer.length()>0;
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}
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UBool
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Normalizer::previousNormalize() {
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UErrorCode errorCode=U_ZERO_ERROR;
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clearBuffer();
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buffer.fLength=unorm_previousNormalize(buffer.fArray, buffer.fCapacity, *text,
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getUNormalizationMode(fMode, errorCode),
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(fOptions&IGNORE_HANGUL)!=0,
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UnicodeString::growBuffer, &buffer,
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&errorCode);
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bufferPos=buffer.length();
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return U_SUCCESS(errorCode) && buffer.length()>0;
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}
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