291 lines
8.4 KiB
C++
291 lines
8.4 KiB
C++
/**
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************************************************************************************
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* Copyright (C) 2006-2007, International Business Machines Corporation and others. *
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* 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 "brkeng.h"
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#include "dictbe.h"
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#include "triedict.h"
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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 "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*/) {
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for (int32_t i = 0; i < (int32_t)(sizeof(fHandled)/sizeof(fHandled[0])); ++i) {
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fHandled[i] = 0;
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}
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}
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UnhandledEngine::~UnhandledEngine() {
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for (int32_t i = 0; i < (int32_t)(sizeof(fHandled)/sizeof(fHandled[0])); ++i) {
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if (fHandled[i] != 0) {
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delete fHandled[i];
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}
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}
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}
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UBool
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UnhandledEngine::handles(UChar32 c, int32_t breakType) const {
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return (breakType >= 0 && breakType < (int32_t)(sizeof(fHandled)/sizeof(fHandled[0]))
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&& fHandled[breakType] != 0 && fHandled[breakType]->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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UBool reverse,
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int32_t breakType,
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UStack &/*foundBreaks*/ ) const {
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if (breakType >= 0 && breakType < (int32_t)(sizeof(fHandled)/sizeof(fHandled[0]))) {
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UChar32 c = utext_current32(text);
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if (reverse) {
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while((int32_t)utext_getNativeIndex(text) > startPos && fHandled[breakType]->contains(c)) {
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c = utext_previous32(text);
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}
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}
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else {
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while((int32_t)utext_getNativeIndex(text) < endPos && fHandled[breakType]->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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}
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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, int32_t breakType) {
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if (breakType >= 0 && breakType < (int32_t)(sizeof(fHandled)/sizeof(fHandled[0]))) {
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if (fHandled[breakType] == 0) {
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fHandled[breakType] = new UnicodeSet();
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if (fHandled[breakType] == 0) {
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return;
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}
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}
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if (!fHandled[breakType]->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[breakType]->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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*/
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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 U_NAMESPACE_QUALIFIER 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, int32_t breakType) {
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UBool needsInit;
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int32_t i;
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const LanguageBreakEngine *lbe = NULL;
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UErrorCode status = U_ZERO_ERROR;
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// TODO: The global mutex should not be used.
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// The global mutex should only be used for short periods.
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// A ICULanguageBreakFactory specific mutex should be used.
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umtx_lock(NULL);
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needsInit = (UBool)(fEngines == NULL);
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if (!needsInit) {
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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, breakType)) {
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break;
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}
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lbe = NULL;
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}
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}
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umtx_unlock(NULL);
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if (lbe != NULL) {
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return lbe;
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}
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if (needsInit) {
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UStack *engines = new UStack(_deleteEngine, NULL, status);
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if (U_SUCCESS(status) && engines == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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else if (U_FAILURE(status)) {
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delete engines;
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engines = NULL;
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}
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else {
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umtx_lock(NULL);
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if (fEngines == NULL) {
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fEngines = engines;
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engines = NULL;
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}
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umtx_unlock(NULL);
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delete engines;
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}
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}
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if (fEngines == NULL) {
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return NULL;
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}
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// We didn't find an engine the first time through, or there was no
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// stack. Create an engine.
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const LanguageBreakEngine *newlbe = loadEngineFor(c, breakType);
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// Now get the lock, and see if someone else has created it in the
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// meantime
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umtx_lock(NULL);
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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, breakType)) {
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break;
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}
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lbe = NULL;
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}
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if (lbe == NULL && newlbe != NULL) {
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fEngines->push((void *)newlbe, status);
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lbe = newlbe;
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newlbe = NULL;
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}
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umtx_unlock(NULL);
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delete newlbe;
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return lbe;
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}
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const LanguageBreakEngine *
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ICULanguageBreakFactory::loadEngineFor(UChar32 c, int32_t breakType) {
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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 CompactTrieDictionary *dict = loadDictionaryFor(code, breakType);
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if (dict != NULL) {
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const LanguageBreakEngine *engine = NULL;
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switch(code) {
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case USCRIPT_THAI:
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engine = new ThaiBreakEngine(dict, status);
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break;
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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 dict;
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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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const CompactTrieDictionary *
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ICULanguageBreakFactory::loadDictionaryFor(UScriptCode script, int32_t /*breakType*/) {
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UErrorCode status = U_ZERO_ERROR;
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// Open root from brkitr tree.
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char dictnbuff[256];
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char ext[4]={'\0'};
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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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b = ures_getByKeyWithFallback(b, uscript_getShortName(script), b, &status);
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int32_t dictnlength = 0;
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const UChar *dictfname = ures_getString(b, &dictnlength, &status);
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if (U_SUCCESS(status) && (size_t)dictnlength >= sizeof(dictnbuff)) {
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dictnlength = 0;
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status = U_BUFFER_OVERFLOW_ERROR;
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}
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if (U_SUCCESS(status) && dictfname) {
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UChar* extStart=u_strchr(dictfname, 0x002e);
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int len = 0;
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if(extStart!=NULL){
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len = extStart-dictfname;
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u_UCharsToChars(extStart+1, ext, sizeof(ext)); // nul terminates the buff
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u_UCharsToChars(dictfname, dictnbuff, len);
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}
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dictnbuff[len]=0; // nul terminate
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}
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ures_close(b);
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UDataMemory *file = udata_open(U_ICUDATA_BRKITR, ext, dictnbuff, &status);
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if (U_SUCCESS(status)) {
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const CompactTrieDictionary *dict = new CompactTrieDictionary(
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file, status);
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if (U_SUCCESS(status) && dict == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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}
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if (U_FAILURE(status)) {
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delete dict;
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dict = NULL;
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}
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return dict;
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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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