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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
************************************************************************************
* Copyright (C) 2006-2016, International Business Machines Corporation
* and others. All Rights Reserved.
************************************************************************************
*/
#include <_foundation_unicode/utypes.h>
#if !UCONFIG_NO_BREAK_ITERATION
#include <_foundation_unicode/uchar.h>
#include <_foundation_unicode/uniset.h>
#include <_foundation_unicode/chariter.h>
#include <_foundation_unicode/ures.h>
#include <_foundation_unicode/udata.h>
#include <_foundation_unicode/putil.h>
#include <_foundation_unicode/ustring.h>
#include <_foundation_unicode/uscript.h>
#include <_foundation_unicode/ucharstrie.h>
#include <_foundation_unicode/bytestrie.h>
#include <_foundation_unicode/rbbi.h>
#include "brkeng.h"
#include "cmemory.h"
#include "dictbe.h"
#include "lstmbe.h"
#include "charstr.h"
#include "dictionarydata.h"
#include "mutex.h"
#include "uvector.h"
#include "umutex.h"
#include "uresimp.h"
#include "ubrkimpl.h"
U_NAMESPACE_BEGIN
/*
******************************************************************
*/
LanguageBreakEngine::LanguageBreakEngine() {
}
LanguageBreakEngine::~LanguageBreakEngine() {
}
/*
******************************************************************
*/
LanguageBreakFactory::LanguageBreakFactory() {
}
LanguageBreakFactory::~LanguageBreakFactory() {
}
/*
******************************************************************
*/
UnhandledEngine::UnhandledEngine(UErrorCode &status) : fHandled(nullptr) {
(void)status;
}
UnhandledEngine::~UnhandledEngine() {
delete fHandled;
fHandled = nullptr;
}
UBool
UnhandledEngine::handles(UChar32 c, const char* locale) const {
(void)locale; // Unused
return fHandled && fHandled->contains(c);
}
int32_t
UnhandledEngine::findBreaks( UText *text,
int32_t startPos,
int32_t endPos,
UVector32 &/*foundBreaks*/,
UBool /* isPhraseBreaking */,
UErrorCode &status) const {
if (U_FAILURE(status)) return 0;
utext_setNativeIndex(text, startPos);
UChar32 c = utext_current32(text);
while((int32_t)utext_getNativeIndex(text) < endPos && fHandled->contains(c)) {
utext_next32(text); // TODO: recast loop to work with post-increment operations.
c = utext_current32(text);
}
return 0;
}
void
UnhandledEngine::handleCharacter(UChar32 c) {
if (fHandled == nullptr) {
fHandled = new UnicodeSet();
if (fHandled == nullptr) {
return;
}
}
if (!fHandled->contains(c)) {
UErrorCode status = U_ZERO_ERROR;
// Apply the entire script of the character.
int32_t script = u_getIntPropertyValue(c, UCHAR_SCRIPT);
fHandled->applyIntPropertyValue(UCHAR_SCRIPT, script, status);
}
}
/*
******************************************************************
*/
ICULanguageBreakFactory::ICULanguageBreakFactory(UErrorCode &/*status*/) {
fEngines = 0;
}
ICULanguageBreakFactory::~ICULanguageBreakFactory() {
if (fEngines != 0) {
delete fEngines;
}
}
void ICULanguageBreakFactory::ensureEngines(UErrorCode& status) {
static UMutex gBreakEngineMutex;
Mutex m(&gBreakEngineMutex);
if (fEngines == nullptr) {
LocalPointer<UStack> engines(new UStack(uprv_deleteUObject, nullptr, status), status);
if (U_SUCCESS(status)) {
fEngines = engines.orphan();
}
}
}
const LanguageBreakEngine *
ICULanguageBreakFactory::getEngineFor(UChar32 c, const char* locale) {
const LanguageBreakEngine *lbe = nullptr;
UErrorCode status = U_ZERO_ERROR;
ensureEngines(status);
if (U_FAILURE(status) ) {
// Note: no way to return error code to caller.
return nullptr;
}
static UMutex gBreakEngineMutex;
Mutex m(&gBreakEngineMutex);
int32_t i = fEngines->size();
while (--i >= 0) {
lbe = (const LanguageBreakEngine *)(fEngines->elementAt(i));
if (lbe != nullptr && lbe->handles(c, locale)) {
return lbe;
}
}
// We didn't find an engine. Create one.
lbe = loadEngineFor(c, locale);
if (lbe != nullptr) {
fEngines->push((void *)lbe, status);
}
return U_SUCCESS(status) ? lbe : nullptr;
}
const LanguageBreakEngine *
ICULanguageBreakFactory::loadEngineFor(UChar32 c, const char*) {
UErrorCode status = U_ZERO_ERROR;
UScriptCode code = uscript_getScript(c, &status);
if (U_SUCCESS(status)) {
const LanguageBreakEngine *engine = nullptr;
// Try to use LSTM first
const LSTMData *data = CreateLSTMDataForScript(code, status);
if (U_SUCCESS(status)) {
if (data != nullptr) {
engine = CreateLSTMBreakEngine(code, data, status);
if (U_SUCCESS(status) && engine != nullptr) {
return engine;
}
if (engine != nullptr) {
delete engine;
engine = nullptr;
} else {
DeleteLSTMData(data);
}
}
}
status = U_ZERO_ERROR; // fallback to dictionary based
DictionaryMatcher *m = loadDictionaryMatcherFor(code);
if (m != nullptr) {
switch(code) {
case USCRIPT_THAI:
engine = new ThaiBreakEngine(m, status);
break;
case USCRIPT_LAO:
engine = new LaoBreakEngine(m, status);
break;
case USCRIPT_MYANMAR:
engine = new BurmeseBreakEngine(m, status);
break;
case USCRIPT_KHMER:
engine = new KhmerBreakEngine(m, status);
break;
#if !UCONFIG_NO_NORMALIZATION
// CJK not available w/o normalization
case USCRIPT_HANGUL:
engine = new CjkBreakEngine(m, kKorean, status);
break;
// use same BreakEngine and dictionary for both Chinese and Japanese
case USCRIPT_HIRAGANA:
case USCRIPT_KATAKANA:
case USCRIPT_HAN:
engine = new CjkBreakEngine(m, kChineseJapanese, status);
break;
#if 0
// TODO: Have to get some characters with script=common handled
// by CjkBreakEngine (e.g. U+309B). Simply subjecting
// them to CjkBreakEngine does not work. The engine has to
// special-case them.
case USCRIPT_COMMON:
{
UBlockCode block = ublock_getCode(code);
if (block == UBLOCK_HIRAGANA || block == UBLOCK_KATAKANA)
engine = new CjkBreakEngine(dict, kChineseJapanese, status);
break;
}
#endif
#endif
default:
break;
}
if (engine == nullptr) {
delete m;
}
else if (U_FAILURE(status)) {
delete engine;
engine = nullptr;
}
return engine;
}
}
return nullptr;
}
DictionaryMatcher *
ICULanguageBreakFactory::loadDictionaryMatcherFor(UScriptCode script) {
UErrorCode status = U_ZERO_ERROR;
// open root from brkitr tree.
UResourceBundle *b = ures_open(U_ICUDATA_BRKITR, "", &status);
b = ures_getByKeyWithFallback(b, "dictionaries", b, &status);
int32_t dictnlength = 0;
const char16_t *dictfname =
ures_getStringByKeyWithFallback(b, uscript_getShortName(script), &dictnlength, &status);
if (U_FAILURE(status)) {
ures_close(b);
return nullptr;
}
CharString dictnbuf;
CharString ext;
const char16_t *extStart = u_memrchr(dictfname, 0x002e, dictnlength); // last dot
if (extStart != nullptr) {
int32_t len = (int32_t)(extStart - dictfname);
ext.appendInvariantChars(UnicodeString(false, extStart + 1, dictnlength - len - 1), status);
dictnlength = len;
}
dictnbuf.appendInvariantChars(UnicodeString(false, dictfname, dictnlength), status);
ures_close(b);
UDataMemory *file = udata_open(U_ICUDATA_BRKITR, ext.data(), dictnbuf.data(), &status);
if (U_SUCCESS(status)) {
// build trie
const uint8_t *data = (const uint8_t *)udata_getMemory(file);
const int32_t *indexes = (const int32_t *)data;
const int32_t offset = indexes[DictionaryData::IX_STRING_TRIE_OFFSET];
const int32_t trieType = indexes[DictionaryData::IX_TRIE_TYPE] & DictionaryData::TRIE_TYPE_MASK;
DictionaryMatcher *m = nullptr;
if (trieType == DictionaryData::TRIE_TYPE_BYTES) {
const int32_t transform = indexes[DictionaryData::IX_TRANSFORM];
const char *characters = (const char *)(data + offset);
m = new BytesDictionaryMatcher(characters, transform, file);
}
else if (trieType == DictionaryData::TRIE_TYPE_UCHARS) {
const char16_t *characters = (const char16_t *)(data + offset);
m = new UCharsDictionaryMatcher(characters, file);
}
if (m == nullptr) {
// no matcher exists to take ownership - either we are an invalid
// type or memory allocation failed
udata_close(file);
}
return m;
} else if (dictfname != nullptr) {
// we don't have a dictionary matcher.
// returning nullptr here will cause us to fail to find a dictionary break engine, as expected
status = U_ZERO_ERROR;
return nullptr;
}
return nullptr;
}
void ICULanguageBreakFactory::addExternalEngine(
ExternalBreakEngine* external, UErrorCode& status) {
LocalPointer<ExternalBreakEngine> engine(external, status);
ensureEngines(status);
LocalPointer<BreakEngineWrapper> wrapper(
new BreakEngineWrapper(engine.orphan(), status), status);
static UMutex gBreakEngineMutex;
Mutex m(&gBreakEngineMutex);
fEngines->push(wrapper.getAlias(), status);
wrapper.orphan();
}
BreakEngineWrapper::BreakEngineWrapper(
ExternalBreakEngine* engine, UErrorCode &status) : delegate(engine, status) {
}
BreakEngineWrapper::~BreakEngineWrapper() {
}
UBool BreakEngineWrapper::handles(UChar32 c, const char* locale) const {
return delegate->isFor(c, locale);
}
int32_t BreakEngineWrapper::findBreaks(
UText *text,
int32_t startPos,
int32_t endPos,
UVector32 &foundBreaks,
UBool /* isPhraseBreaking */,
UErrorCode &status) const {
if (U_FAILURE(status)) return 0;
int32_t result = 0;
// Find the span of characters included in the set.
// The span to break begins at the current position in the text, and
// extends towards the start or end of the text, depending on 'reverse'.
utext_setNativeIndex(text, startPos);
int32_t start = (int32_t)utext_getNativeIndex(text);
int32_t current;
int32_t rangeStart;
int32_t rangeEnd;
UChar32 c = utext_current32(text);
while((current = (int32_t)utext_getNativeIndex(text)) < endPos && delegate->handles(c)) {
utext_next32(text); // TODO: recast loop for postincrement
c = utext_current32(text);
}
rangeStart = start;
rangeEnd = current;
int32_t beforeSize = foundBreaks.size();
int32_t additionalCapacity = rangeEnd - rangeStart + 1;
// enlarge to contains (rangeEnd-rangeStart+1) more items
foundBreaks.ensureCapacity(beforeSize+additionalCapacity, status);
if (U_FAILURE(status)) return 0;
foundBreaks.setSize(beforeSize + beforeSize+additionalCapacity);
result = delegate->fillBreaks(text, rangeStart, rangeEnd, foundBreaks.getBuffer()+beforeSize,
additionalCapacity, status);
if (U_FAILURE(status)) return 0;
foundBreaks.setSize(beforeSize + result);
utext_setNativeIndex(text, current);
return result;
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
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