クメール語の ICU ブレーク イテレータに、より良い機能を追加しようとしています (タイ語と同じように辞書を使用します)。
常にブレークイテレータをブレークさせたいキャラクターがありますが、それを機能させるためにコードに「ルール」を追加する方法がわかりません。
必ずブレイクしたいキャラはU+17CB
U+17CB 文字はすでに fEndWordSet = fKhmerWordSet に含まれています。しかし、問題は、fEndWordSet では単語の末尾に過ぎないことです。単なる可能性としてではなく、常にキャラクターの後に壊れるように変更する必要があります。
私はあまり経験がありません。
クメール語の現在のブレーク イテレータは次のとおりです (dictbe.cpp に含まれています。ソース全体はここで表示できます)。
// How many words in a row are "good enough"?
#define KHMER_LOOKAHEAD 3
// Will not combine a non-word with a preceding dictionary word longer than this
#define KHMER_ROOT_COMBINE_THRESHOLD 3
// Will not combine a non-word that shares at least this much prefix with a
// dictionary word, with a preceding word
#define KHMER_PREFIX_COMBINE_THRESHOLD 3
// Minimum word size
#define KHMER_MIN_WORD 2
// Minimum number of characters for two words
#define KHMER_MIN_WORD_SPAN (KHMER_MIN_WORD * 2)
KhmerBreakEngine::KhmerBreakEngine(const TrieWordDictionary *adoptDictionary, UErrorCode &status)
: DictionaryBreakEngine((1<<UBRK_WORD) | (1<<UBRK_LINE)),
fDictionary(adoptDictionary)
{
fKhmerWordSet.applyPattern(UNICODE_STRING_SIMPLE("[[:Khmr:]&[:LineBreak=SA:]]"), status);
if (U_SUCCESS(status)) {
setCharacters(fKhmerWordSet);
}
fMarkSet.applyPattern(UNICODE_STRING_SIMPLE("[[:Khmr:]&[:LineBreak=SA:]&[:M:]]"), status);
fMarkSet.add(0x0020);
fEndWordSet = fKhmerWordSet;
fBeginWordSet.add(0x1780, 0x17B3);
//fBeginWordSet.add(0x17A3, 0x17A4); // deprecated vowels
//fEndWordSet.remove(0x17A5, 0x17A9); // Khmer independent vowels that can't end a word
//fEndWordSet.remove(0x17B2); // Khmer independent vowel that can't end a word
fEndWordSet.remove(0x17D2); // KHMER SIGN COENG that combines some following characters
//fEndWordSet.remove(0x17B6, 0x17C5); // Remove dependent vowels
// fEndWordSet.remove(0x0E31); // MAI HAN-AKAT
// fEndWordSet.remove(0x0E40, 0x0E44); // SARA E through SARA AI MAIMALAI
// fBeginWordSet.add(0x0E01, 0x0E2E); // KO KAI through HO NOKHUK
// fBeginWordSet.add(0x0E40, 0x0E44); // SARA E through SARA AI MAIMALAI
// fSuffixSet.add(THAI_PAIYANNOI);
// fSuffixSet.add(THAI_MAIYAMOK);
// Compact for caching.
fMarkSet.compact();
fEndWordSet.compact();
fBeginWordSet.compact();
// fSuffixSet.compact();
}
KhmerBreakEngine::~KhmerBreakEngine() {
delete fDictionary;
}
int32_t
KhmerBreakEngine::divideUpDictionaryRange( UText *text,
int32_t rangeStart,
int32_t rangeEnd,
UStack &foundBreaks ) const {
if ((rangeEnd - rangeStart) < KHMER_MIN_WORD_SPAN) {
return 0; // Not enough characters for two words
}
uint32_t wordsFound = 0;
int32_t wordLength;
int32_t current;
UErrorCode status = U_ZERO_ERROR;
PossibleWord words[KHMER_LOOKAHEAD];
UChar32 uc;
utext_setNativeIndex(text, rangeStart);
while (U_SUCCESS(status) && (current = (int32_t)utext_getNativeIndex(text)) < rangeEnd) {
wordLength = 0;
// Look for candidate words at the current position
int candidates = words[wordsFound%KHMER_LOOKAHEAD].candidates(text, fDictionary, rangeEnd);
// If we found exactly one, use that
if (candidates == 1) {
wordLength = words[wordsFound%KHMER_LOOKAHEAD].acceptMarked(text);
wordsFound += 1;
}
// If there was more than one, see which one can take us forward the most words
else if (candidates > 1) {
// If we're already at the end of the range, we're done
if ((int32_t)utext_getNativeIndex(text) >= rangeEnd) {
goto foundBest;
}
do {
int wordsMatched = 1;
if (words[(wordsFound+1)%KHMER_LOOKAHEAD].candidates(text, fDictionary, rangeEnd) > 0) {
if (wordsMatched < 2) {
// Followed by another dictionary word; mark first word as a good candidate
words[wordsFound%KHMER_LOOKAHEAD].markCurrent();
wordsMatched = 2;
}
// If we're already at the end of the range, we're done
if ((int32_t)utext_getNativeIndex(text) >= rangeEnd) {
goto foundBest;
}
// See if any of the possible second words is followed by a third word
do {
// If we find a third word, stop right away
if (words[(wordsFound+2)%KHMER_LOOKAHEAD].candidates(text, fDictionary, rangeEnd)) {
words[wordsFound%KHMER_LOOKAHEAD].markCurrent();
goto foundBest;
}
}
while (words[(wordsFound+1)%KHMER_LOOKAHEAD].backUp(text));
}
}
while (words[wordsFound%KHMER_LOOKAHEAD].backUp(text));
foundBest:
wordLength = words[wordsFound%KHMER_LOOKAHEAD].acceptMarked(text);
wordsFound += 1;
}
// We come here after having either found a word or not. We look ahead to the
// next word. If it's not a dictionary word, we will combine it with the word we
// just found (if there is one), but only if the preceding word does not exceed
// the threshold.
// The text iterator should now be positioned at the end of the word we found.
if ((int32_t)utext_getNativeIndex(text) < rangeEnd && wordLength < KHMER_ROOT_COMBINE_THRESHOLD) {
// if it is a dictionary word, do nothing. If it isn't, then if there is
// no preceding word, or the non-word shares less than the minimum threshold
// of characters with a dictionary word, then scan to resynchronize
if (words[wordsFound%KHMER_LOOKAHEAD].candidates(text, fDictionary, rangeEnd) <= 0
&& (wordLength == 0
|| words[wordsFound%KHMER_LOOKAHEAD].longestPrefix() < KHMER_PREFIX_COMBINE_THRESHOLD)) {
// Look for a plausible word boundary
//TODO: This section will need a rework for UText.
int32_t remaining = rangeEnd - (current+wordLength);
UChar32 pc = utext_current32(text);
int32_t chars = 0;
for (;;) {
utext_next32(text);
uc = utext_current32(text);
// TODO: Here we're counting on the fact that the SA languages are all
// in the BMP. This should get fixed with the UText rework.
chars += 1;
if (--remaining <= 0) {
break;
}
if (fEndWordSet.contains(pc) && fBeginWordSet.contains(uc)) {
// Maybe. See if it's in the dictionary.
int candidates = words[(wordsFound+1)%KHMER_LOOKAHEAD].candidates(text, fDictionary, rangeEnd);
utext_setNativeIndex(text, current+wordLength+chars);
if (candidates > 0) {
break;
}
}
pc = uc;
}
// Bump the word count if there wasn't already one
if (wordLength <= 0) {
wordsFound += 1;
}
// Update the length with the passed-over characters
wordLength += chars;
}
else {
// Back up to where we were for next iteration
utext_setNativeIndex(text, current+wordLength);
}
}
// Never stop before a combining mark.
int32_t currPos;
while ((currPos = (int32_t)utext_getNativeIndex(text)) < rangeEnd && fMarkSet.contains(utext_current32(text))) {
utext_next32(text);
wordLength += (int32_t)utext_getNativeIndex(text) - currPos;
}
// Did we find a word on this iteration? If so, push it on the break stack
if (wordLength > 0) {
foundBreaks.push((current+wordLength), status);
}
}
// Don't return a break for the end of the dictionary range if there is one there.
if (foundBreaks.peeki() >= rangeEnd) {
(void) foundBreaks.popi();
wordsFound -= 1;
}
return wordsFound;
}