// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* *************************************************************************** * Copyright (C) 1999-2016 International Business Machines Corporation * and others. All rights reserved. *************************************************************************** */ // // file: rbbi.cpp Contains the implementation of the rule based break iterator // runtime engine and the API implementation for // class RuleBasedBreakIterator // #include "utypeinfo.h" // for 'typeid' to work #include "unicode/utypes.h" #if !UCONFIG_NO_BREAK_ITERATION #include #include "unicode/rbbi.h" #include "unicode/schriter.h" #include "unicode/uchriter.h" #include "unicode/uclean.h" #include "unicode/udata.h" #include "brkeng.h" #include "ucln_cmn.h" #include "cmemory.h" #include "cstring.h" #include "localsvc.h" #include "rbbidata.h" #include "rbbi_cache.h" #include "rbbirb.h" #include "uassert.h" #include "umutex.h" #include "uvectr32.h" #ifdef RBBI_DEBUG static UBool gTrace = FALSE; #endif U_NAMESPACE_BEGIN // The state number of the starting state constexpr int32_t START_STATE = 1; // The state-transition value indicating "stop" constexpr int32_t STOP_STATE = 0; UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RuleBasedBreakIterator) //======================================================================= // constructors //======================================================================= /** * Constructs a RuleBasedBreakIterator that uses the already-created * tables object that is passed in as a parameter. */ RuleBasedBreakIterator::RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status) : fSCharIter(UnicodeString()) { init(status); fData = new RBBIDataWrapper(data, status); // status checked in constructor if (U_FAILURE(status)) {return;} if(fData == 0) { status = U_MEMORY_ALLOCATION_ERROR; return; } } // // Construct from precompiled binary rules (tables). This constructor is public API, // taking the rules as a (const uint8_t *) to match the type produced by getBinaryRules(). // RuleBasedBreakIterator::RuleBasedBreakIterator(const uint8_t *compiledRules, uint32_t ruleLength, UErrorCode &status) : fSCharIter(UnicodeString()) { init(status); if (U_FAILURE(status)) { return; } if (compiledRules == NULL || ruleLength < sizeof(RBBIDataHeader)) { status = U_ILLEGAL_ARGUMENT_ERROR; return; } const RBBIDataHeader *data = (const RBBIDataHeader *)compiledRules; if (data->fLength > ruleLength) { status = U_ILLEGAL_ARGUMENT_ERROR; return; } fData = new RBBIDataWrapper(data, RBBIDataWrapper::kDontAdopt, status); if (U_FAILURE(status)) {return;} if(fData == 0) { status = U_MEMORY_ALLOCATION_ERROR; return; } } //------------------------------------------------------------------------------- // // Constructor from a UDataMemory handle to precompiled break rules // stored in an ICU data file. // //------------------------------------------------------------------------------- RuleBasedBreakIterator::RuleBasedBreakIterator(UDataMemory* udm, UErrorCode &status) : fSCharIter(UnicodeString()) { init(status); fData = new RBBIDataWrapper(udm, status); // status checked in constructor if (U_FAILURE(status)) {return;} if(fData == 0) { status = U_MEMORY_ALLOCATION_ERROR; return; } } //------------------------------------------------------------------------------- // // Constructor from a set of rules supplied as a string. // //------------------------------------------------------------------------------- RuleBasedBreakIterator::RuleBasedBreakIterator( const UnicodeString &rules, UParseError &parseError, UErrorCode &status) : fSCharIter(UnicodeString()) { init(status); if (U_FAILURE(status)) {return;} RuleBasedBreakIterator *bi = (RuleBasedBreakIterator *) RBBIRuleBuilder::createRuleBasedBreakIterator(rules, &parseError, status); // Note: This is a bit awkward. The RBBI ruleBuilder has a factory method that // creates and returns a complete RBBI. From here, in a constructor, we // can't just return the object created by the builder factory, hence // the assignment of the factory created object to "this". if (U_SUCCESS(status)) { *this = *bi; delete bi; } } //------------------------------------------------------------------------------- // // Default Constructor. Create an empty shell that can be set up later. // Used when creating a RuleBasedBreakIterator from a set // of rules. //------------------------------------------------------------------------------- RuleBasedBreakIterator::RuleBasedBreakIterator() : fSCharIter(UnicodeString()) { UErrorCode status = U_ZERO_ERROR; init(status); } //------------------------------------------------------------------------------- // // Copy constructor. Will produce a break iterator with the same behavior, // and which iterates over the same text, as the one passed in. // //------------------------------------------------------------------------------- RuleBasedBreakIterator::RuleBasedBreakIterator(const RuleBasedBreakIterator& other) : BreakIterator(other), fSCharIter(UnicodeString()) { UErrorCode status = U_ZERO_ERROR; this->init(status); *this = other; } /** * Destructor */ RuleBasedBreakIterator::~RuleBasedBreakIterator() { if (fCharIter != &fSCharIter) { // fCharIter was adopted from the outside. delete fCharIter; } fCharIter = NULL; utext_close(&fText); if (fData != NULL) { fData->removeReference(); fData = NULL; } delete fBreakCache; fBreakCache = NULL; delete fDictionaryCache; fDictionaryCache = NULL; delete fLanguageBreakEngines; fLanguageBreakEngines = NULL; delete fUnhandledBreakEngine; fUnhandledBreakEngine = NULL; } /** * Assignment operator. Sets this iterator to have the same behavior, * and iterate over the same text, as the one passed in. */ RuleBasedBreakIterator& RuleBasedBreakIterator::operator=(const RuleBasedBreakIterator& that) { if (this == &that) { return *this; } BreakIterator::operator=(that); if (fLanguageBreakEngines != NULL) { delete fLanguageBreakEngines; fLanguageBreakEngines = NULL; // Just rebuild for now } // TODO: clone fLanguageBreakEngines from "that" UErrorCode status = U_ZERO_ERROR; utext_clone(&fText, &that.fText, FALSE, TRUE, &status); if (fCharIter != &fSCharIter) { delete fCharIter; } fCharIter = &fSCharIter; if (that.fCharIter != NULL && that.fCharIter != &that.fSCharIter) { // This is a little bit tricky - it will intially appear that // this->fCharIter is adopted, even if that->fCharIter was // not adopted. That's ok. fCharIter = that.fCharIter->clone(); } fSCharIter = that.fSCharIter; if (fCharIter == NULL) { fCharIter = &fSCharIter; } if (fData != NULL) { fData->removeReference(); fData = NULL; } if (that.fData != NULL) { fData = that.fData->addReference(); } fPosition = that.fPosition; fRuleStatusIndex = that.fRuleStatusIndex; fDone = that.fDone; // TODO: both the dictionary and the main cache need to be copied. // Current position could be within a dictionary range. Trying to continue // the iteration without the caches present would go to the rules, with // the assumption that the current position is on a rule boundary. fBreakCache->reset(fPosition, fRuleStatusIndex); fDictionaryCache->reset(); return *this; } //----------------------------------------------------------------------------- // // init() Shared initialization routine. Used by all the constructors. // Initializes all fields, leaving the object in a consistent state. // //----------------------------------------------------------------------------- void RuleBasedBreakIterator::init(UErrorCode &status) { fCharIter = NULL; fData = NULL; fPosition = 0; fRuleStatusIndex = 0; fDone = false; fDictionaryCharCount = 0; fLanguageBreakEngines = NULL; fUnhandledBreakEngine = NULL; fBreakCache = NULL; fDictionaryCache = NULL; // Note: IBM xlC is unable to assign or initialize member fText from UTEXT_INITIALIZER. // fText = UTEXT_INITIALIZER; static const UText initializedUText = UTEXT_INITIALIZER; uprv_memcpy(&fText, &initializedUText, sizeof(UText)); if (U_FAILURE(status)) { return; } utext_openUChars(&fText, NULL, 0, &status); fDictionaryCache = new DictionaryCache(this, status); fBreakCache = new BreakCache(this, status); if (U_SUCCESS(status) && (fDictionaryCache == NULL || fBreakCache == NULL)) { status = U_MEMORY_ALLOCATION_ERROR; } #ifdef RBBI_DEBUG static UBool debugInitDone = FALSE; if (debugInitDone == FALSE) { char *debugEnv = getenv("U_RBBIDEBUG"); if (debugEnv && uprv_strstr(debugEnv, "trace")) { gTrace = TRUE; } debugInitDone = TRUE; } #endif } //----------------------------------------------------------------------------- // // clone - Returns a newly-constructed RuleBasedBreakIterator with the same // behavior, and iterating over the same text, as this one. // Virtual function: does the right thing with subclasses. // //----------------------------------------------------------------------------- RuleBasedBreakIterator* RuleBasedBreakIterator::clone() const { return new RuleBasedBreakIterator(*this); } /** * Equality operator. Returns TRUE if both BreakIterators are of the * same class, have the same behavior, and iterate over the same text. */ UBool RuleBasedBreakIterator::operator==(const BreakIterator& that) const { if (typeid(*this) != typeid(that)) { return FALSE; } if (this == &that) { return TRUE; } // The base class BreakIterator carries no state that participates in equality, // and does not implement an equality function that would otherwise be // checked at this point. const RuleBasedBreakIterator& that2 = (const RuleBasedBreakIterator&) that; if (!utext_equals(&fText, &that2.fText)) { // The two break iterators are operating on different text, // or have a different iteration position. // Note that fText's position is always the same as the break iterator's position. return FALSE; } if (!(fPosition == that2.fPosition && fRuleStatusIndex == that2.fRuleStatusIndex && fDone == that2.fDone)) { return FALSE; } if (that2.fData == fData || (fData != NULL && that2.fData != NULL && *that2.fData == *fData)) { // The two break iterators are using the same rules. return TRUE; } return FALSE; } /** * Compute a hash code for this BreakIterator * @return A hash code */ int32_t RuleBasedBreakIterator::hashCode(void) const { int32_t hash = 0; if (fData != NULL) { hash = fData->hashCode(); } return hash; } void RuleBasedBreakIterator::setText(UText *ut, UErrorCode &status) { if (U_FAILURE(status)) { return; } fBreakCache->reset(); fDictionaryCache->reset(); utext_clone(&fText, ut, FALSE, TRUE, &status); // Set up a dummy CharacterIterator to be returned if anyone // calls getText(). With input from UText, there is no reasonable // way to return a characterIterator over the actual input text. // Return one over an empty string instead - this is the closest // we can come to signaling a failure. // (GetText() is obsolete, this failure is sort of OK) fSCharIter.setText(UnicodeString()); if (fCharIter != &fSCharIter) { // existing fCharIter was adopted from the outside. Delete it now. delete fCharIter; } fCharIter = &fSCharIter; this->first(); } UText *RuleBasedBreakIterator::getUText(UText *fillIn, UErrorCode &status) const { UText *result = utext_clone(fillIn, &fText, FALSE, TRUE, &status); return result; } //======================================================================= // BreakIterator overrides //======================================================================= /** * Return a CharacterIterator over the text being analyzed. */ CharacterIterator& RuleBasedBreakIterator::getText() const { return *fCharIter; } /** * Set the iterator to analyze a new piece of text. This function resets * the current iteration position to the beginning of the text. * @param newText An iterator over the text to analyze. */ void RuleBasedBreakIterator::adoptText(CharacterIterator* newText) { // If we are holding a CharacterIterator adopted from a // previous call to this function, delete it now. if (fCharIter != &fSCharIter) { delete fCharIter; } fCharIter = newText; UErrorCode status = U_ZERO_ERROR; fBreakCache->reset(); fDictionaryCache->reset(); if (newText==NULL || newText->startIndex() != 0) { // startIndex !=0 wants to be an error, but there's no way to report it. // Make the iterator text be an empty string. utext_openUChars(&fText, NULL, 0, &status); } else { utext_openCharacterIterator(&fText, newText, &status); } this->first(); } /** * Set the iterator to analyze a new piece of text. This function resets * the current iteration position to the beginning of the text. * @param newText An iterator over the text to analyze. */ void RuleBasedBreakIterator::setText(const UnicodeString& newText) { UErrorCode status = U_ZERO_ERROR; fBreakCache->reset(); fDictionaryCache->reset(); utext_openConstUnicodeString(&fText, &newText, &status); // Set up a character iterator on the string. // Needed in case someone calls getText(). // Can not, unfortunately, do this lazily on the (probably never) // call to getText(), because getText is const. fSCharIter.setText(newText); if (fCharIter != &fSCharIter) { // old fCharIter was adopted from the outside. Delete it. delete fCharIter; } fCharIter = &fSCharIter; this->first(); } /** * Provide a new UText for the input text. Must reference text with contents identical * to the original. * Intended for use with text data originating in Java (garbage collected) environments * where the data may be moved in memory at arbitrary times. */ RuleBasedBreakIterator &RuleBasedBreakIterator::refreshInputText(UText *input, UErrorCode &status) { if (U_FAILURE(status)) { return *this; } if (input == NULL) { status = U_ILLEGAL_ARGUMENT_ERROR; return *this; } int64_t pos = utext_getNativeIndex(&fText); // Shallow read-only clone of the new UText into the existing input UText utext_clone(&fText, input, FALSE, TRUE, &status); if (U_FAILURE(status)) { return *this; } utext_setNativeIndex(&fText, pos); if (utext_getNativeIndex(&fText) != pos) { // Sanity check. The new input utext is supposed to have the exact same // contents as the old. If we can't set to the same position, it doesn't. // The contents underlying the old utext might be invalid at this point, // so it's not safe to check directly. status = U_ILLEGAL_ARGUMENT_ERROR; } return *this; } /** * Sets the current iteration position to the beginning of the text, position zero. * @return The new iterator position, which is zero. */ int32_t RuleBasedBreakIterator::first(void) { UErrorCode status = U_ZERO_ERROR; if (!fBreakCache->seek(0)) { fBreakCache->populateNear(0, status); } fBreakCache->current(); U_ASSERT(fPosition == 0); return 0; } /** * Sets the current iteration position to the end of the text. * @return The text's past-the-end offset. */ int32_t RuleBasedBreakIterator::last(void) { int32_t endPos = (int32_t)utext_nativeLength(&fText); UBool endShouldBeBoundary = isBoundary(endPos); // Has side effect of setting iterator position. (void)endShouldBeBoundary; U_ASSERT(endShouldBeBoundary); U_ASSERT(fPosition == endPos); return endPos; } /** * Advances the iterator either forward or backward the specified number of steps. * Negative values move backward, and positive values move forward. This is * equivalent to repeatedly calling next() or previous(). * @param n The number of steps to move. The sign indicates the direction * (negative is backwards, and positive is forwards). * @return The character offset of the boundary position n boundaries away from * the current one. */ int32_t RuleBasedBreakIterator::next(int32_t n) { int32_t result = 0; if (n > 0) { for (; n > 0 && result != UBRK_DONE; --n) { result = next(); } } else if (n < 0) { for (; n < 0 && result != UBRK_DONE; ++n) { result = previous(); } } else { result = current(); } return result; } /** * Advances the iterator to the next boundary position. * @return The position of the first boundary after this one. */ int32_t RuleBasedBreakIterator::next(void) { fBreakCache->next(); return fDone ? UBRK_DONE : fPosition; } /** * Move the iterator backwards, to the boundary preceding the current one. * * Starts from the current position within fText. * Starting position need not be on a boundary. * * @return The position of the boundary position immediately preceding the starting position. */ int32_t RuleBasedBreakIterator::previous(void) { UErrorCode status = U_ZERO_ERROR; fBreakCache->previous(status); return fDone ? UBRK_DONE : fPosition; } /** * Sets the iterator to refer to the first boundary position following * the specified position. * @param startPos The position from which to begin searching for a break position. * @return The position of the first break after the current position. */ int32_t RuleBasedBreakIterator::following(int32_t startPos) { // if the supplied position is before the beginning, return the // text's starting offset if (startPos < 0) { return first(); } // Move requested offset to a code point start. It might be on a trail surrogate, // or on a trail byte if the input is UTF-8. Or it may be beyond the end of the text. utext_setNativeIndex(&fText, startPos); startPos = (int32_t)utext_getNativeIndex(&fText); UErrorCode status = U_ZERO_ERROR; fBreakCache->following(startPos, status); return fDone ? UBRK_DONE : fPosition; } /** * Sets the iterator to refer to the last boundary position before the * specified position. * @param offset The position to begin searching for a break from. * @return The position of the last boundary before the starting position. */ int32_t RuleBasedBreakIterator::preceding(int32_t offset) { if (offset > utext_nativeLength(&fText)) { return last(); } // Move requested offset to a code point start. It might be on a trail surrogate, // or on a trail byte if the input is UTF-8. utext_setNativeIndex(&fText, offset); int32_t adjustedOffset = static_cast(utext_getNativeIndex(&fText)); UErrorCode status = U_ZERO_ERROR; fBreakCache->preceding(adjustedOffset, status); return fDone ? UBRK_DONE : fPosition; } /** * Returns true if the specfied position is a boundary position. As a side * effect, leaves the iterator pointing to the first boundary position at * or after "offset". * * @param offset the offset to check. * @return True if "offset" is a boundary position. */ UBool RuleBasedBreakIterator::isBoundary(int32_t offset) { // out-of-range indexes are never boundary positions if (offset < 0) { first(); // For side effects on current position, tag values. return FALSE; } // Adjust offset to be on a code point boundary and not beyond the end of the text. // Note that isBoundary() is always false for offsets that are not on code point boundaries. // But we still need the side effect of leaving iteration at the following boundary. utext_setNativeIndex(&fText, offset); int32_t adjustedOffset = static_cast(utext_getNativeIndex(&fText)); bool result = false; UErrorCode status = U_ZERO_ERROR; if (fBreakCache->seek(adjustedOffset) || fBreakCache->populateNear(adjustedOffset, status)) { result = (fBreakCache->current() == offset); } if (result && adjustedOffset < offset && utext_char32At(&fText, offset) == U_SENTINEL) { // Original offset is beyond the end of the text. Return FALSE, it's not a boundary, // but the iteration position remains set to the end of the text, which is a boundary. return FALSE; } if (!result) { // Not on a boundary. isBoundary() must leave iterator on the following boundary. // Cache->seek(), above, left us on the preceding boundary, so advance one. next(); } return result; } /** * Returns the current iteration position. * @return The current iteration position. */ int32_t RuleBasedBreakIterator::current(void) const { return fPosition; } //======================================================================= // implementation //======================================================================= // // RBBIRunMode - the state machine runs an extra iteration at the beginning and end // of user text. A variable with this enum type keeps track of where we // are. The state machine only fetches user input while in the RUN mode. // enum RBBIRunMode { RBBI_START, // state machine processing is before first char of input RBBI_RUN, // state machine processing is in the user text RBBI_END // state machine processing is after end of user text. }; // Map from look-ahead break states (corresponds to rules) to boundary positions. // Allows multiple lookahead break rules to be in flight at the same time. // // This is a temporary approach for ICU 57. A better fix is to make the look-ahead numbers // in the state table be sequential, then we can just index an array. And the // table could also tell us in advance how big that array needs to be. // // Before ICU 57 there was just a single simple variable for a look-ahead match that // was in progress. Two rules at once did not work. static const int32_t kMaxLookaheads = 8; struct LookAheadResults { int32_t fUsedSlotLimit; int32_t fPositions[8]; int16_t fKeys[8]; LookAheadResults() : fUsedSlotLimit(0), fPositions(), fKeys() {} int32_t getPosition(int16_t key) { for (int32_t i=0; i= kMaxLookaheads) { UPRV_UNREACHABLE; } fKeys[i] = key; fPositions[i] = position; U_ASSERT(fUsedSlotLimit == i); fUsedSlotLimit = i + 1; } }; //----------------------------------------------------------------------------------- // // handleNext() // Run the state machine to find a boundary // //----------------------------------------------------------------------------------- int32_t RuleBasedBreakIterator::handleNext() { int32_t state; uint16_t category = 0; RBBIRunMode mode; RBBIStateTableRow *row; UChar32 c; LookAheadResults lookAheadMatches; int32_t result = 0; int32_t initialPosition = 0; const RBBIStateTable *statetable = fData->fForwardTable; const char *tableData = statetable->fTableData; uint32_t tableRowLen = statetable->fRowLen; #ifdef RBBI_DEBUG if (gTrace) { RBBIDebugPuts("Handle Next pos char state category"); } #endif // handleNext alway sets the break tag value. // Set the default for it. fRuleStatusIndex = 0; fDictionaryCharCount = 0; // if we're already at the end of the text, return DONE. initialPosition = fPosition; UTEXT_SETNATIVEINDEX(&fText, initialPosition); result = initialPosition; c = UTEXT_NEXT32(&fText); if (c==U_SENTINEL) { fDone = TRUE; return UBRK_DONE; } // Set the initial state for the state machine state = START_STATE; row = (RBBIStateTableRow *) //(statetable->fTableData + (statetable->fRowLen * state)); (tableData + tableRowLen * state); mode = RBBI_RUN; if (statetable->fFlags & RBBI_BOF_REQUIRED) { category = 2; mode = RBBI_START; } // loop until we reach the end of the text or transition to state 0 // for (;;) { if (c == U_SENTINEL) { // Reached end of input string. if (mode == RBBI_END) { // We have already run the loop one last time with the // character set to the psueudo {eof} value. Now it is time // to unconditionally bail out. break; } // Run the loop one last time with the fake end-of-input character category. mode = RBBI_END; category = 1; } // // Get the char category. An incoming category of 1 or 2 means that // we are preset for doing the beginning or end of input, and // that we shouldn't get a category from an actual text input character. // if (mode == RBBI_RUN) { // look up the current character's character category, which tells us // which column in the state table to look at. // Note: the 16 in UTRIE_GET16 refers to the size of the data being returned, // not the size of the character going in, which is a UChar32. // category = UTRIE2_GET16(fData->fTrie, c); // Check the dictionary bit in the character's category. // Counter is only used by dictionary based iteration. // Chars that need to be handled by a dictionary have a flag bit set // in their category values. // if ((category & 0x4000) != 0) { fDictionaryCharCount++; // And off the dictionary flag bit. category &= ~0x4000; } } #ifdef RBBI_DEBUG if (gTrace) { RBBIDebugPrintf(" %4" PRId64 " ", utext_getNativeIndex(&fText)); if (0x20<=c && c<0x7f) { RBBIDebugPrintf("\"%c\" ", c); } else { RBBIDebugPrintf("%5x ", c); } RBBIDebugPrintf("%3d %3d\n", state, category); } #endif // State Transition - move machine to its next state // // fNextState is a variable-length array. U_ASSERT(categoryfHeader->fCatCount); state = row->fNextState[category]; /*Not accessing beyond memory*/ row = (RBBIStateTableRow *) // (statetable->fTableData + (statetable->fRowLen * state)); (tableData + tableRowLen * state); if (row->fAccepting == -1) { // Match found, common case. if (mode != RBBI_START) { result = (int32_t)UTEXT_GETNATIVEINDEX(&fText); } fRuleStatusIndex = row->fTagIdx; // Remember the break status (tag) values. } int16_t completedRule = row->fAccepting; if (completedRule > 0) { // Lookahead match is completed. int32_t lookaheadResult = lookAheadMatches.getPosition(completedRule); if (lookaheadResult >= 0) { fRuleStatusIndex = row->fTagIdx; fPosition = lookaheadResult; return lookaheadResult; } } // If we are at the position of the '/' in a look-ahead (hard break) rule; // record the current position, to be returned later, if the full rule matches. // TODO: Move this check before the previous check of fAccepting. // This would enable hard-break rules with no following context. // But there are line break test failures when trying this. Investigate. // Issue ICU-20837 int16_t rule = row->fLookAhead; if (rule != 0) { int32_t pos = (int32_t)UTEXT_GETNATIVEINDEX(&fText); lookAheadMatches.setPosition(rule, pos); } if (state == STOP_STATE) { // This is the normal exit from the lookup state machine. // We have advanced through the string until it is certain that no // longer match is possible, no matter what characters follow. break; } // Advance to the next character. // If this is a beginning-of-input loop iteration, don't advance // the input position. The next iteration will be processing the // first real input character. if (mode == RBBI_RUN) { c = UTEXT_NEXT32(&fText); } else { if (mode == RBBI_START) { mode = RBBI_RUN; } } } // The state machine is done. Check whether it found a match... // If the iterator failed to advance in the match engine, force it ahead by one. // (This really indicates a defect in the break rules. They should always match // at least one character.) if (result == initialPosition) { utext_setNativeIndex(&fText, initialPosition); utext_next32(&fText); result = (int32_t)utext_getNativeIndex(&fText); fRuleStatusIndex = 0; } // Leave the iterator at our result position. fPosition = result; #ifdef RBBI_DEBUG if (gTrace) { RBBIDebugPrintf("result = %d\n\n", result); } #endif return result; } //----------------------------------------------------------------------------------- // // handleSafePrevious() // // Iterate backwards using the safe reverse rules. // The logic of this function is similar to handleNext(), but simpler // because the safe table does not require as many options. // //----------------------------------------------------------------------------------- int32_t RuleBasedBreakIterator::handleSafePrevious(int32_t fromPosition) { int32_t state; uint16_t category = 0; RBBIStateTableRow *row; UChar32 c; int32_t result = 0; const RBBIStateTable *stateTable = fData->fReverseTable; UTEXT_SETNATIVEINDEX(&fText, fromPosition); #ifdef RBBI_DEBUG if (gTrace) { RBBIDebugPuts("Handle Previous pos char state category"); } #endif // if we're already at the start of the text, return DONE. if (fData == NULL || UTEXT_GETNATIVEINDEX(&fText)==0) { return BreakIterator::DONE; } // Set the initial state for the state machine c = UTEXT_PREVIOUS32(&fText); state = START_STATE; row = (RBBIStateTableRow *) (stateTable->fTableData + (stateTable->fRowLen * state)); // loop until we reach the start of the text or transition to state 0 // for (; c != U_SENTINEL; c = UTEXT_PREVIOUS32(&fText)) { // look up the current character's character category, which tells us // which column in the state table to look at. // Note: the 16 in UTRIE_GET16 refers to the size of the data being returned, // not the size of the character going in, which is a UChar32. // // And off the dictionary flag bit. For reverse iteration it is not used. category = UTRIE2_GET16(fData->fTrie, c); category &= ~0x4000; #ifdef RBBI_DEBUG if (gTrace) { RBBIDebugPrintf(" %4d ", (int32_t)utext_getNativeIndex(&fText)); if (0x20<=c && c<0x7f) { RBBIDebugPrintf("\"%c\" ", c); } else { RBBIDebugPrintf("%5x ", c); } RBBIDebugPrintf("%3d %3d\n", state, category); } #endif // State Transition - move machine to its next state // // fNextState is a variable-length array. U_ASSERT(categoryfHeader->fCatCount); state = row->fNextState[category]; /*Not accessing beyond memory*/ row = (RBBIStateTableRow *) (stateTable->fTableData + (stateTable->fRowLen * state)); if (state == STOP_STATE) { // This is the normal exit from the lookup state machine. // Transistion to state zero means we have found a safe point. break; } } // The state machine is done. Check whether it found a match... result = (int32_t)UTEXT_GETNATIVEINDEX(&fText); #ifdef RBBI_DEBUG if (gTrace) { RBBIDebugPrintf("result = %d\n\n", result); } #endif return result; } //------------------------------------------------------------------------------- // // getRuleStatus() Return the break rule tag associated with the current // iterator position. If the iterator arrived at its current // position by iterating forwards, the value will have been // cached by the handleNext() function. // //------------------------------------------------------------------------------- int32_t RuleBasedBreakIterator::getRuleStatus() const { // fLastRuleStatusIndex indexes to the start of the appropriate status record // (the number of status values.) // This function returns the last (largest) of the array of status values. int32_t idx = fRuleStatusIndex + fData->fRuleStatusTable[fRuleStatusIndex]; int32_t tagVal = fData->fRuleStatusTable[idx]; return tagVal; } int32_t RuleBasedBreakIterator::getRuleStatusVec( int32_t *fillInVec, int32_t capacity, UErrorCode &status) { if (U_FAILURE(status)) { return 0; } int32_t numVals = fData->fRuleStatusTable[fRuleStatusIndex]; int32_t numValsToCopy = numVals; if (numVals > capacity) { status = U_BUFFER_OVERFLOW_ERROR; numValsToCopy = capacity; } int i; for (i=0; ifRuleStatusTable[fRuleStatusIndex + i + 1]; } return numVals; } //------------------------------------------------------------------------------- // // getBinaryRules Access to the compiled form of the rules, // for use by build system tools that save the data // for standard iterator types. // //------------------------------------------------------------------------------- const uint8_t *RuleBasedBreakIterator::getBinaryRules(uint32_t &length) { const uint8_t *retPtr = NULL; length = 0; if (fData != NULL) { retPtr = (const uint8_t *)fData->fHeader; length = fData->fHeader->fLength; } return retPtr; } RuleBasedBreakIterator *RuleBasedBreakIterator::createBufferClone( void * /*stackBuffer*/, int32_t &bufferSize, UErrorCode &status) { if (U_FAILURE(status)){ return NULL; } if (bufferSize == 0) { bufferSize = 1; // preflighting for deprecated functionality return NULL; } BreakIterator *clonedBI = clone(); if (clonedBI == NULL) { status = U_MEMORY_ALLOCATION_ERROR; } else { status = U_SAFECLONE_ALLOCATED_WARNING; } return (RuleBasedBreakIterator *)clonedBI; } U_NAMESPACE_END static icu::UStack *gLanguageBreakFactories = nullptr; static const icu::UnicodeString *gEmptyString = nullptr; static icu::UInitOnce gLanguageBreakFactoriesInitOnce = U_INITONCE_INITIALIZER; static icu::UInitOnce gRBBIInitOnce = U_INITONCE_INITIALIZER; /** * Release all static memory held by breakiterator. */ U_CDECL_BEGIN UBool U_CALLCONV rbbi_cleanup(void) { delete gLanguageBreakFactories; gLanguageBreakFactories = nullptr; delete gEmptyString; gEmptyString = nullptr; gLanguageBreakFactoriesInitOnce.reset(); gRBBIInitOnce.reset(); return TRUE; } U_CDECL_END U_CDECL_BEGIN static void U_CALLCONV _deleteFactory(void *obj) { delete (icu::LanguageBreakFactory *) obj; } U_CDECL_END U_NAMESPACE_BEGIN static void U_CALLCONV rbbiInit() { gEmptyString = new UnicodeString(); ucln_common_registerCleanup(UCLN_COMMON_RBBI, rbbi_cleanup); } static void U_CALLCONV initLanguageFactories() { UErrorCode status = U_ZERO_ERROR; U_ASSERT(gLanguageBreakFactories == NULL); gLanguageBreakFactories = new UStack(_deleteFactory, NULL, status); if (gLanguageBreakFactories != NULL && U_SUCCESS(status)) { ICULanguageBreakFactory *builtIn = new ICULanguageBreakFactory(status); gLanguageBreakFactories->push(builtIn, status); #ifdef U_LOCAL_SERVICE_HOOK LanguageBreakFactory *extra = (LanguageBreakFactory *)uprv_svc_hook("languageBreakFactory", &status); if (extra != NULL) { gLanguageBreakFactories->push(extra, status); } #endif } ucln_common_registerCleanup(UCLN_COMMON_RBBI, rbbi_cleanup); } static const LanguageBreakEngine* getLanguageBreakEngineFromFactory(UChar32 c) { umtx_initOnce(gLanguageBreakFactoriesInitOnce, &initLanguageFactories); if (gLanguageBreakFactories == NULL) { return NULL; } int32_t i = gLanguageBreakFactories->size(); const LanguageBreakEngine *lbe = NULL; while (--i >= 0) { LanguageBreakFactory *factory = (LanguageBreakFactory *)(gLanguageBreakFactories->elementAt(i)); lbe = factory->getEngineFor(c); if (lbe != NULL) { break; } } return lbe; } //------------------------------------------------------------------------------- // // getLanguageBreakEngine Find an appropriate LanguageBreakEngine for the // the character c. // //------------------------------------------------------------------------------- const LanguageBreakEngine * RuleBasedBreakIterator::getLanguageBreakEngine(UChar32 c) { const LanguageBreakEngine *lbe = NULL; UErrorCode status = U_ZERO_ERROR; if (fLanguageBreakEngines == NULL) { fLanguageBreakEngines = new UStack(status); if (fLanguageBreakEngines == NULL || U_FAILURE(status)) { delete fLanguageBreakEngines; fLanguageBreakEngines = 0; return NULL; } } int32_t i = fLanguageBreakEngines->size(); while (--i >= 0) { lbe = (const LanguageBreakEngine *)(fLanguageBreakEngines->elementAt(i)); if (lbe->handles(c)) { return lbe; } } // No existing dictionary took the character. See if a factory wants to // give us a new LanguageBreakEngine for this character. lbe = getLanguageBreakEngineFromFactory(c); // If we got one, use it and push it on our stack. if (lbe != NULL) { fLanguageBreakEngines->push((void *)lbe, status); // Even if we can't remember it, we can keep looking it up, so // return it even if the push fails. return lbe; } // No engine is forthcoming for this character. Add it to the // reject set. Create the reject break engine if needed. if (fUnhandledBreakEngine == NULL) { fUnhandledBreakEngine = new UnhandledEngine(status); if (U_SUCCESS(status) && fUnhandledBreakEngine == NULL) { status = U_MEMORY_ALLOCATION_ERROR; return nullptr; } // Put it last so that scripts for which we have an engine get tried // first. fLanguageBreakEngines->insertElementAt(fUnhandledBreakEngine, 0, status); // If we can't insert it, or creation failed, get rid of it if (U_FAILURE(status)) { delete fUnhandledBreakEngine; fUnhandledBreakEngine = 0; return NULL; } } // Tell the reject engine about the character; at its discretion, it may // add more than just the one character. fUnhandledBreakEngine->handleCharacter(c); return fUnhandledBreakEngine; } void RuleBasedBreakIterator::dumpCache() { fBreakCache->dumpCache(); } void RuleBasedBreakIterator::dumpTables() { fData->printData(); } /** * Returns the description used to create this iterator */ const UnicodeString& RuleBasedBreakIterator::getRules() const { if (fData != NULL) { return fData->getRuleSourceString(); } else { umtx_initOnce(gRBBIInitOnce, &rbbiInit); return *gEmptyString; } } U_NAMESPACE_END #endif /* #if !UCONFIG_NO_BREAK_ITERATION */