105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2000, 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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* 01/17/2000 aliu Ported from Java.
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**********************************************************************
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*/
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#include "unicode/hangjamo.h"
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#include "unicode/rep.h"
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#include "unicode/unifilt.h"
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#include "unicode/unicode.h"
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// These constants are from the Unicode book's algorithm.
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#define SBase (0xAC00)
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#define LBase (0x1100)
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#define VBase (0x1161)
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#define TBase (0x11A7)
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#define LCount (19)
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#define VCount (21)
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#define TCount (28)
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#define NCount (VCount * TCount) // 588
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#define SCount (LCount * NCount) // 11172
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/**
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* ID for this transliterator.
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*/
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const char* HangulJamoTransliterator::_ID = "Hangul-Jamo";
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/**
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* Constructs a transliterator.
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*/
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HangulJamoTransliterator::HangulJamoTransliterator(UnicodeFilter* adoptedFilter) :
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Transliterator(_ID, adoptedFilter) {
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}
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/**
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* Copy constructor.
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*/
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HangulJamoTransliterator::HangulJamoTransliterator(const HangulJamoTransliterator& o) :
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Transliterator(o) {
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}
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/**
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* Assignment operator.
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*/
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HangulJamoTransliterator& HangulJamoTransliterator::operator=(
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const HangulJamoTransliterator& o) {
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Transliterator::operator=(o);
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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* HangulJamoTransliterator::clone(void) const {
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return new HangulJamoTransliterator(*this);
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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 HangulJamoTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
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UBool isIncremental) const {
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int32_t cursor = offsets.start;
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int32_t limit = offsets.limit;
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UnicodeString replacement;
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while (cursor < limit) {
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UChar c = text.charAt(cursor);
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if (decomposeHangul(c, replacement)) {
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text.handleReplaceBetween(cursor, cursor+1, replacement);
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int32_t len = replacement.length();
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cursor += len; // skip over replacement
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limit += len - 1; // fix up limit
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offsets.contextLimit += len - 1; // fix up limit
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} else {
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++cursor;
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}
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}
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offsets.contextLimit += limit - offsets.limit;
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offsets.limit = limit;
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offsets.start = cursor;
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}
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UBool HangulJamoTransliterator::decomposeHangul(UChar s, UnicodeString& result) {
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int32_t SIndex = s - SBase;
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if (0 > SIndex || SIndex >= SCount) {
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return FALSE;
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}
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int32_t L = LBase + SIndex / NCount;
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int32_t V = VBase + (SIndex % NCount) / TCount;
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int32_t T = TBase + SIndex % TCount;
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result.truncate(0);
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result.append((UChar)L);
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result.append((UChar)V);
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if (T != TBase) {
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result.append((UChar)T);
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}
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return TRUE;
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}
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