170 lines
5.1 KiB
C++
170 lines
5.1 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 07/03/01 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/nortrans.h"
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/**
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* System registration hook.
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*/
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void NormalizationTransliterator::registerIDs() {
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UErrorCode status = U_ZERO_ERROR;
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Transliterator::_registerFactory(UnicodeString("NFC", ""), _createNFC, status);
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Transliterator::_registerFactory(UnicodeString("NFKC", ""), _createNFKC, status);
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Transliterator::_registerFactory(UnicodeString("NFD", ""), _createNFD, status);
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Transliterator::_registerFactory(UnicodeString("NFKD", ""), _createNFKD, status);
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}
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/**
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* Factory methods
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*/
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Transliterator* NormalizationTransliterator::_createNFC() {
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return new NormalizationTransliterator(UnicodeString("NFC", ""),
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Normalizer::COMPOSE, 0);
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}
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Transliterator* NormalizationTransliterator::_createNFKC() {
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return new NormalizationTransliterator(UnicodeString("NFKC", ""),
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Normalizer::COMPOSE_COMPAT, 0);
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}
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Transliterator* NormalizationTransliterator::_createNFD() {
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return new NormalizationTransliterator(UnicodeString("NFD", ""),
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Normalizer::DECOMP, 0);
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}
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Transliterator* NormalizationTransliterator::_createNFKD() {
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return new NormalizationTransliterator(UnicodeString("NFKD", ""),
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Normalizer::DECOMP_COMPAT, 0);
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}
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/**
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* Factory method.
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*/
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NormalizationTransliterator*
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NormalizationTransliterator::createInstance(Normalizer::EMode m,
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int32_t opt) {
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UnicodeString id("NF", "");
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if ((m & Normalizer::COMPAT_BIT) != 0) {
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id.append((UChar)0x004B /*K*/);
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}
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id.append((UChar) (((m & Normalizer::COMPOSE_BIT) != 0) ? 0x0043 : 0x0044));
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return new NormalizationTransliterator(id, m, opt);
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}
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/**
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* Constructs a transliterator.
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*/
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NormalizationTransliterator::NormalizationTransliterator(
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const UnicodeString& id,
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Normalizer::EMode m, int32_t opt) :
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Transliterator(id, 0) {
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mode = m;
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options = opt;
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}
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/**
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* Destructor.
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*/
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NormalizationTransliterator::~NormalizationTransliterator() {
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}
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/**
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* Copy constructor.
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*/
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NormalizationTransliterator::NormalizationTransliterator(const NormalizationTransliterator& o) :
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Transliterator(o) {
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mode = o.mode;
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options = o.options;
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}
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/**
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* Assignment operator.
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*/
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NormalizationTransliterator& NormalizationTransliterator::operator=(const NormalizationTransliterator& o) {
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Transliterator::operator=(o);
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mode = o.mode;
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options = o.options;
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return *this;
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}
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/**
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* Transliterator API.
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*/
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Transliterator* NormalizationTransliterator::clone(void) const {
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return new NormalizationTransliterator(*this);
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}
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// TODO
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// TODO
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// TODO
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// Get rid of this function and use the official Replaceable
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// extractBetween() method, when possible
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// TODO
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// TODO
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// TODO
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static void _Replaceable_extractBetween(const Replaceable& text,
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int32_t start,
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int32_t limit,
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UChar* buffer) {
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while (start < limit) {
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*buffer++ = text.charAt(start++);
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}
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}
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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*/
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void NormalizationTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
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UBool isIncremental) const {
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int32_t start = offsets.start;
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int32_t limit = offsets.limit;
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// For the non-incremental case normalize right up to
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// offsets.limit. In the incremental case, find the last base
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// character b, and pass everything from the start up to the
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// character before b to normalizer.
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if (isIncremental) {
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--limit;
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while (limit > start &&
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u_getCombiningClass(text.charAt(limit)) != 0) {
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--limit;
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}
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}
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if (limit > start) {
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UChar staticChars[256];
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UChar* chars = staticChars;
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if ((limit - start) > 255) {
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// Allocate extra buffer space if needed
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chars = new UChar[limit-start+1];
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if (chars == NULL) {
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return;
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}
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}
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_Replaceable_extractBetween(text, start, limit, chars);
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UnicodeString input(FALSE, chars, limit-start); // readonly alias
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UnicodeString output;
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UErrorCode status = U_ZERO_ERROR;
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Normalizer::normalize(input, mode, options, output, status);
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if (chars != staticChars) {
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delete[] chars;
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}
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text.handleReplaceBetween(start, limit, output);
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int32_t delta = output.length() - input.length();
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offsets.contextLimit += delta;
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offsets.limit += delta;
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offsets.start = limit;
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}
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}
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