304 lines
9.4 KiB
C++
304 lines
9.4 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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************************************************************************************
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* Copyright (C) 2006-2016, International Business Machines Corporation
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* and 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_BREAK_ITERATION
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#include "unicode/uchar.h"
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#include "unicode/uniset.h"
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#include "unicode/chariter.h"
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#include "unicode/ures.h"
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#include "unicode/udata.h"
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#include "unicode/putil.h"
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#include "unicode/ustring.h"
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#include "unicode/uscript.h"
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#include "unicode/ucharstrie.h"
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#include "unicode/bytestrie.h"
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#include "brkeng.h"
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#include "cmemory.h"
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#include "dictbe.h"
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#include "lstmbe.h"
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#include "charstr.h"
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#include "dictionarydata.h"
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#include "mutex.h"
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#include "uvector.h"
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#include "umutex.h"
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#include "uresimp.h"
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#include "ubrkimpl.h"
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U_NAMESPACE_BEGIN
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/*
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******************************************************************
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*/
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LanguageBreakEngine::LanguageBreakEngine() {
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}
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LanguageBreakEngine::~LanguageBreakEngine() {
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}
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/*
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******************************************************************
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*/
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LanguageBreakFactory::LanguageBreakFactory() {
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}
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LanguageBreakFactory::~LanguageBreakFactory() {
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}
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/*
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******************************************************************
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*/
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UnhandledEngine::UnhandledEngine(UErrorCode &status) : fHandled(nullptr) {
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(void)status;
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}
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UnhandledEngine::~UnhandledEngine() {
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delete fHandled;
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fHandled = nullptr;
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}
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UBool
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UnhandledEngine::handles(UChar32 c) const {
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return fHandled && fHandled->contains(c);
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}
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int32_t
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UnhandledEngine::findBreaks( UText *text,
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int32_t /* startPos */,
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int32_t endPos,
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UVector32 &/*foundBreaks*/,
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UBool /* isPhraseBreaking */,
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UErrorCode &status) const {
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if (U_FAILURE(status)) return 0;
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UChar32 c = utext_current32(text);
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while((int32_t)utext_getNativeIndex(text) < endPos && fHandled->contains(c)) {
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utext_next32(text); // TODO: recast loop to work with post-increment operations.
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c = utext_current32(text);
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}
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return 0;
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}
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void
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UnhandledEngine::handleCharacter(UChar32 c) {
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if (fHandled == nullptr) {
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fHandled = new UnicodeSet();
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if (fHandled == nullptr) {
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return;
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}
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}
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if (!fHandled->contains(c)) {
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UErrorCode status = U_ZERO_ERROR;
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// Apply the entire script of the character.
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int32_t script = u_getIntPropertyValue(c, UCHAR_SCRIPT);
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fHandled->applyIntPropertyValue(UCHAR_SCRIPT, script, status);
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}
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}
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/*
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******************************************************************
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*/
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ICULanguageBreakFactory::ICULanguageBreakFactory(UErrorCode &/*status*/) {
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fEngines = 0;
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}
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ICULanguageBreakFactory::~ICULanguageBreakFactory() {
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if (fEngines != 0) {
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delete fEngines;
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}
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}
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U_NAMESPACE_END
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U_CDECL_BEGIN
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static void U_CALLCONV _deleteEngine(void *obj) {
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delete (const icu::LanguageBreakEngine *) obj;
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}
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U_CDECL_END
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U_NAMESPACE_BEGIN
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const LanguageBreakEngine *
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ICULanguageBreakFactory::getEngineFor(UChar32 c) {
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const LanguageBreakEngine *lbe = NULL;
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UErrorCode status = U_ZERO_ERROR;
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static UMutex gBreakEngineMutex;
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Mutex m(&gBreakEngineMutex);
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if (fEngines == nullptr) {
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LocalPointer<UStack> engines(new UStack(_deleteEngine, nullptr, status), status);
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if (U_FAILURE(status) ) {
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// Note: no way to return error code to caller.
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return nullptr;
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}
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fEngines = engines.orphan();
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} else {
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int32_t i = fEngines->size();
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while (--i >= 0) {
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lbe = (const LanguageBreakEngine *)(fEngines->elementAt(i));
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if (lbe != NULL && lbe->handles(c)) {
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return lbe;
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}
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}
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}
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// We didn't find an engine. Create one.
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lbe = loadEngineFor(c);
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if (lbe != nullptr) {
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fEngines->push((void *)lbe, status);
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}
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return U_SUCCESS(status) ? lbe : nullptr;
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}
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const LanguageBreakEngine *
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ICULanguageBreakFactory::loadEngineFor(UChar32 c) {
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UErrorCode status = U_ZERO_ERROR;
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UScriptCode code = uscript_getScript(c, &status);
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if (U_SUCCESS(status)) {
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const LanguageBreakEngine *engine = nullptr;
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// Try to use LSTM first
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const LSTMData *data = CreateLSTMDataForScript(code, status);
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if (U_SUCCESS(status)) {
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if (data != nullptr) {
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engine = CreateLSTMBreakEngine(code, data, status);
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if (U_SUCCESS(status) && engine != nullptr) {
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return engine;
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}
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if (engine != nullptr) {
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delete engine;
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engine = nullptr;
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} else {
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DeleteLSTMData(data);
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}
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}
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}
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status = U_ZERO_ERROR; // fallback to dictionary based
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DictionaryMatcher *m = loadDictionaryMatcherFor(code);
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if (m != NULL) {
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switch(code) {
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case USCRIPT_THAI:
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engine = new ThaiBreakEngine(m, status);
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break;
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case USCRIPT_LAO:
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engine = new LaoBreakEngine(m, status);
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break;
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case USCRIPT_MYANMAR:
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engine = new BurmeseBreakEngine(m, status);
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break;
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case USCRIPT_KHMER:
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engine = new KhmerBreakEngine(m, status);
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break;
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#if !UCONFIG_NO_NORMALIZATION
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// CJK not available w/o normalization
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case USCRIPT_HANGUL:
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engine = new CjkBreakEngine(m, kKorean, status);
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break;
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// use same BreakEngine and dictionary for both Chinese and Japanese
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case USCRIPT_HIRAGANA:
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case USCRIPT_KATAKANA:
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case USCRIPT_HAN:
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engine = new CjkBreakEngine(m, kChineseJapanese, status);
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break;
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#if 0
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// TODO: Have to get some characters with script=common handled
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// by CjkBreakEngine (e.g. U+309B). Simply subjecting
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// them to CjkBreakEngine does not work. The engine has to
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// special-case them.
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case USCRIPT_COMMON:
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{
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UBlockCode block = ublock_getCode(code);
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if (block == UBLOCK_HIRAGANA || block == UBLOCK_KATAKANA)
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engine = new CjkBreakEngine(dict, kChineseJapanese, status);
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break;
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}
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#endif
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#endif
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default:
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break;
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}
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if (engine == NULL) {
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delete m;
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}
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else if (U_FAILURE(status)) {
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delete engine;
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engine = NULL;
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}
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return engine;
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}
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}
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return NULL;
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}
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DictionaryMatcher *
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ICULanguageBreakFactory::loadDictionaryMatcherFor(UScriptCode script) {
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UErrorCode status = U_ZERO_ERROR;
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// open root from brkitr tree.
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UResourceBundle *b = ures_open(U_ICUDATA_BRKITR, "", &status);
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b = ures_getByKeyWithFallback(b, "dictionaries", b, &status);
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int32_t dictnlength = 0;
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const UChar *dictfname =
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ures_getStringByKeyWithFallback(b, uscript_getShortName(script), &dictnlength, &status);
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if (U_FAILURE(status)) {
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ures_close(b);
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return NULL;
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}
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CharString dictnbuf;
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CharString ext;
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const UChar *extStart = u_memrchr(dictfname, 0x002e, dictnlength); // last dot
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if (extStart != NULL) {
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int32_t len = (int32_t)(extStart - dictfname);
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ext.appendInvariantChars(UnicodeString(false, extStart + 1, dictnlength - len - 1), status);
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dictnlength = len;
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}
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dictnbuf.appendInvariantChars(UnicodeString(false, dictfname, dictnlength), status);
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ures_close(b);
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UDataMemory *file = udata_open(U_ICUDATA_BRKITR, ext.data(), dictnbuf.data(), &status);
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if (U_SUCCESS(status)) {
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// build trie
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const uint8_t *data = (const uint8_t *)udata_getMemory(file);
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const int32_t *indexes = (const int32_t *)data;
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const int32_t offset = indexes[DictionaryData::IX_STRING_TRIE_OFFSET];
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const int32_t trieType = indexes[DictionaryData::IX_TRIE_TYPE] & DictionaryData::TRIE_TYPE_MASK;
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DictionaryMatcher *m = NULL;
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if (trieType == DictionaryData::TRIE_TYPE_BYTES) {
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const int32_t transform = indexes[DictionaryData::IX_TRANSFORM];
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const char *characters = (const char *)(data + offset);
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m = new BytesDictionaryMatcher(characters, transform, file);
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}
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else if (trieType == DictionaryData::TRIE_TYPE_UCHARS) {
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const UChar *characters = (const UChar *)(data + offset);
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m = new UCharsDictionaryMatcher(characters, file);
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}
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if (m == NULL) {
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// no matcher exists to take ownership - either we are an invalid
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// type or memory allocation failed
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udata_close(file);
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}
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return m;
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} else if (dictfname != NULL) {
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// we don't have a dictionary matcher.
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// returning NULL here will cause us to fail to find a dictionary break engine, as expected
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status = U_ZERO_ERROR;
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return NULL;
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}
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return NULL;
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
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