1940 lines
68 KiB
C++
1940 lines
68 KiB
C++
/*
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***************************************************************************
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* Copyright (C) 1999-2011 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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//
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// file: rbbi.c Contains the implementation of the rule based break iterator
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// runtime engine and the API implementation for
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// class RuleBasedBreakIterator
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//
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#include <typeinfo> // for 'typeid' to work
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_BREAK_ITERATION
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#include "unicode/rbbi.h"
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#include "unicode/schriter.h"
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#include "unicode/uchriter.h"
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#include "unicode/udata.h"
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#include "unicode/uclean.h"
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#include "rbbidata.h"
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#include "rbbirb.h"
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#include "cmemory.h"
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#include "cstring.h"
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#include "umutex.h"
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#include "ucln_cmn.h"
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#include "brkeng.h"
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#include "uassert.h"
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#include "uvector.h"
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// if U_LOCAL_SERVICE_HOOK is defined, then localsvc.cpp is expected to be included.
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#if U_LOCAL_SERVICE_HOOK
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#include "localsvc.h"
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#endif
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#ifdef RBBI_DEBUG
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static UBool fTrace = FALSE;
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#endif
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U_NAMESPACE_BEGIN
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// The state number of the starting state
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#define START_STATE 1
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// The state-transition value indicating "stop"
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#define STOP_STATE 0
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RuleBasedBreakIterator)
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//=======================================================================
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// constructors
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//=======================================================================
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/**
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* Constructs a RuleBasedBreakIterator that uses the already-created
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* tables object that is passed in as a parameter.
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*/
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RuleBasedBreakIterator::RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status)
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{
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init();
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fData = new RBBIDataWrapper(data, status); // status checked in constructor
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if (U_FAILURE(status)) {return;}
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if(fData == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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/**
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* Same as above but does not adopt memory
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*/
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RuleBasedBreakIterator::RuleBasedBreakIterator(const RBBIDataHeader* data, enum EDontAdopt, UErrorCode &status)
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{
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init();
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fData = new RBBIDataWrapper(data, RBBIDataWrapper::kDontAdopt, status); // status checked in constructor
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if (U_FAILURE(status)) {return;}
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if(fData == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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//
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// Construct from precompiled binary rules (tables). This constructor is public API,
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// taking the rules as a (const uint8_t *) to match the type produced by getBinaryRules().
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//
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RuleBasedBreakIterator::RuleBasedBreakIterator(const uint8_t *compiledRules,
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uint32_t ruleLength,
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UErrorCode &status) {
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init();
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if (U_FAILURE(status)) {
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return;
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}
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if (compiledRules == NULL || ruleLength < sizeof(RBBIDataHeader)) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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const RBBIDataHeader *data = (const RBBIDataHeader *)compiledRules;
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if (data->fLength > ruleLength) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return;
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}
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fData = new RBBIDataWrapper(data, RBBIDataWrapper::kDontAdopt, status);
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if (U_FAILURE(status)) {return;}
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if(fData == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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//-------------------------------------------------------------------------------
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//
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// Constructor from a UDataMemory handle to precompiled break rules
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// stored in an ICU data file.
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//
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//-------------------------------------------------------------------------------
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RuleBasedBreakIterator::RuleBasedBreakIterator(UDataMemory* udm, UErrorCode &status)
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{
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init();
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fData = new RBBIDataWrapper(udm, status); // status checked in constructor
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if (U_FAILURE(status)) {return;}
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if(fData == 0) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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//-------------------------------------------------------------------------------
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//
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// Constructor from a set of rules supplied as a string.
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//
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//-------------------------------------------------------------------------------
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RuleBasedBreakIterator::RuleBasedBreakIterator( const UnicodeString &rules,
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UParseError &parseError,
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UErrorCode &status)
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{
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init();
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if (U_FAILURE(status)) {return;}
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RuleBasedBreakIterator *bi = (RuleBasedBreakIterator *)
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RBBIRuleBuilder::createRuleBasedBreakIterator(rules, &parseError, status);
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// Note: This is a bit awkward. The RBBI ruleBuilder has a factory method that
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// creates and returns a complete RBBI. From here, in a constructor, we
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// can't just return the object created by the builder factory, hence
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// the assignment of the factory created object to "this".
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if (U_SUCCESS(status)) {
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*this = *bi;
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delete bi;
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}
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}
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//-------------------------------------------------------------------------------
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//
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// Default Constructor. Create an empty shell that can be set up later.
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// Used when creating a RuleBasedBreakIterator from a set
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// of rules.
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//-------------------------------------------------------------------------------
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RuleBasedBreakIterator::RuleBasedBreakIterator() {
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init();
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}
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//-------------------------------------------------------------------------------
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//
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// Copy constructor. Will produce a break iterator with the same behavior,
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// and which iterates over the same text, as the one passed in.
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//
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//-------------------------------------------------------------------------------
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RuleBasedBreakIterator::RuleBasedBreakIterator(const RuleBasedBreakIterator& other)
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: BreakIterator(other)
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{
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this->init();
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*this = other;
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}
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/**
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* Destructor
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*/
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RuleBasedBreakIterator::~RuleBasedBreakIterator() {
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if (fCharIter!=fSCharIter && fCharIter!=fDCharIter) {
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// fCharIter was adopted from the outside.
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delete fCharIter;
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}
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fCharIter = NULL;
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delete fSCharIter;
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fCharIter = NULL;
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delete fDCharIter;
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fDCharIter = NULL;
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utext_close(fText);
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if (fData != NULL) {
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fData->removeReference();
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fData = NULL;
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}
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if (fCachedBreakPositions) {
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uprv_free(fCachedBreakPositions);
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fCachedBreakPositions = NULL;
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}
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if (fLanguageBreakEngines) {
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delete fLanguageBreakEngines;
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fLanguageBreakEngines = NULL;
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}
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if (fUnhandledBreakEngine) {
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delete fUnhandledBreakEngine;
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fUnhandledBreakEngine = NULL;
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}
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}
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/**
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* Assignment operator. Sets this iterator to have the same behavior,
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* and iterate over the same text, as the one passed in.
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*/
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RuleBasedBreakIterator&
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RuleBasedBreakIterator::operator=(const RuleBasedBreakIterator& that) {
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if (this == &that) {
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return *this;
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}
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reset(); // Delete break cache information
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fBreakType = that.fBreakType;
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if (fLanguageBreakEngines != NULL) {
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delete fLanguageBreakEngines;
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fLanguageBreakEngines = NULL; // Just rebuild for now
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}
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// TODO: clone fLanguageBreakEngines from "that"
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UErrorCode status = U_ZERO_ERROR;
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fText = utext_clone(fText, that.fText, FALSE, TRUE, &status);
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if (fCharIter!=fSCharIter && fCharIter!=fDCharIter) {
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delete fCharIter;
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}
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fCharIter = NULL;
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if (that.fCharIter != NULL ) {
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// This is a little bit tricky - it will intially appear that
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// this->fCharIter is adopted, even if that->fCharIter was
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// not adopted. That's ok.
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fCharIter = that.fCharIter->clone();
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}
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if (fData != NULL) {
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fData->removeReference();
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fData = NULL;
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}
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if (that.fData != NULL) {
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fData = that.fData->addReference();
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}
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return *this;
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}
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//-----------------------------------------------------------------------------
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//
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// init() Shared initialization routine. Used by all the constructors.
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// Initializes all fields, leaving the object in a consistent state.
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//
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//-----------------------------------------------------------------------------
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void RuleBasedBreakIterator::init() {
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UErrorCode status = U_ZERO_ERROR;
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fBufferClone = FALSE;
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fText = utext_openUChars(NULL, NULL, 0, &status);
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fCharIter = NULL;
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fSCharIter = NULL;
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fDCharIter = NULL;
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fData = NULL;
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fLastRuleStatusIndex = 0;
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fLastStatusIndexValid = TRUE;
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fDictionaryCharCount = 0;
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fBreakType = UBRK_WORD; // Defaulting BreakType to word gives reasonable
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// dictionary behavior for Break Iterators that are
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// built from rules. Even better would be the ability to
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// declare the type in the rules.
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fCachedBreakPositions = NULL;
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fLanguageBreakEngines = NULL;
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fUnhandledBreakEngine = NULL;
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fNumCachedBreakPositions = 0;
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fPositionInCache = 0;
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#ifdef RBBI_DEBUG
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static UBool debugInitDone = FALSE;
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if (debugInitDone == FALSE) {
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char *debugEnv = getenv("U_RBBIDEBUG");
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if (debugEnv && uprv_strstr(debugEnv, "trace")) {
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fTrace = TRUE;
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}
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debugInitDone = TRUE;
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}
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#endif
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}
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//-----------------------------------------------------------------------------
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//
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// clone - Returns a newly-constructed RuleBasedBreakIterator with the same
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// behavior, and iterating over the same text, as this one.
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// Virtual function: does the right thing with subclasses.
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//
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//-----------------------------------------------------------------------------
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BreakIterator*
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RuleBasedBreakIterator::clone(void) const {
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return new RuleBasedBreakIterator(*this);
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}
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/**
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* Equality operator. Returns TRUE if both BreakIterators are of the
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* same class, have the same behavior, and iterate over the same text.
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*/
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UBool
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RuleBasedBreakIterator::operator==(const BreakIterator& that) const {
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if (typeid(*this) != typeid(that)) {
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return FALSE;
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}
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const RuleBasedBreakIterator& that2 = (const RuleBasedBreakIterator&) that;
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if (!utext_equals(fText, that2.fText)) {
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// The two break iterators are operating on different text,
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// or have a different interation position.
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return FALSE;
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};
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// TODO: need a check for when in a dictionary region at different offsets.
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if (that2.fData == fData ||
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(fData != NULL && that2.fData != NULL && *that2.fData == *fData)) {
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// The two break iterators are using the same rules.
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Compute a hash code for this BreakIterator
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* @return A hash code
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*/
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int32_t
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RuleBasedBreakIterator::hashCode(void) const {
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int32_t hash = 0;
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if (fData != NULL) {
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hash = fData->hashCode();
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}
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return hash;
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}
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void RuleBasedBreakIterator::setText(UText *ut, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return;
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}
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reset();
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fText = utext_clone(fText, ut, FALSE, TRUE, &status);
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// Set up a dummy CharacterIterator to be returned if anyone
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// calls getText(). With input from UText, there is no reasonable
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// way to return a characterIterator over the actual input text.
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// Return one over an empty string instead - this is the closest
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// we can come to signaling a failure.
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// (GetText() is obsolete, this failure is sort of OK)
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if (fDCharIter == NULL) {
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static const UChar c = 0;
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fDCharIter = new UCharCharacterIterator(&c, 0);
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if (fDCharIter == NULL) {
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status = U_MEMORY_ALLOCATION_ERROR;
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return;
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}
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}
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if (fCharIter!=fSCharIter && fCharIter!=fDCharIter) {
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// existing fCharIter was adopted from the outside. Delete it now.
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delete fCharIter;
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}
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fCharIter = fDCharIter;
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this->first();
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}
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UText *RuleBasedBreakIterator::getUText(UText *fillIn, UErrorCode &status) const {
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UText *result = utext_clone(fillIn, fText, FALSE, TRUE, &status);
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return result;
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}
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/**
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* Returns the description used to create this iterator
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*/
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const UnicodeString&
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RuleBasedBreakIterator::getRules() const {
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if (fData != NULL) {
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return fData->getRuleSourceString();
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} else {
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static const UnicodeString *s;
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if (s == NULL) {
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// TODO: something more elegant here.
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// perhaps API should return the string by value.
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// Note: thread unsafe init & leak are semi-ok, better than
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// what was before. Sould be cleaned up, though.
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s = new UnicodeString;
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}
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return *s;
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}
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}
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//=======================================================================
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// BreakIterator overrides
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//=======================================================================
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/**
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* Return a CharacterIterator over the text being analyzed.
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*/
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CharacterIterator&
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RuleBasedBreakIterator::getText() const {
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return *fCharIter;
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}
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/**
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* Set the iterator to analyze a new piece of text. This function resets
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* the current iteration position to the beginning of the text.
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* @param newText An iterator over the text to analyze.
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*/
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void
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RuleBasedBreakIterator::adoptText(CharacterIterator* newText) {
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// If we are holding a CharacterIterator adopted from a
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// previous call to this function, delete it now.
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if (fCharIter!=fSCharIter && fCharIter!=fDCharIter) {
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delete fCharIter;
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}
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fCharIter = newText;
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UErrorCode status = U_ZERO_ERROR;
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reset();
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if (newText==NULL || newText->startIndex() != 0) {
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// startIndex !=0 wants to be an error, but there's no way to report it.
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// Make the iterator text be an empty string.
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fText = utext_openUChars(fText, NULL, 0, &status);
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} else {
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fText = utext_openCharacterIterator(fText, newText, &status);
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}
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this->first();
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}
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/**
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* Set the iterator to analyze a new piece of text. This function resets
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* the current iteration position to the beginning of the text.
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* @param newText An iterator over the text to analyze.
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*/
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void
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RuleBasedBreakIterator::setText(const UnicodeString& newText) {
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UErrorCode status = U_ZERO_ERROR;
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reset();
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fText = utext_openConstUnicodeString(fText, &newText, &status);
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// Set up a character iterator on the string.
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// Needed in case someone calls getText().
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// Can not, unfortunately, do this lazily on the (probably never)
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// call to getText(), because getText is const.
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if (fSCharIter == NULL) {
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fSCharIter = new StringCharacterIterator(newText);
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} else {
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fSCharIter->setText(newText);
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}
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if (fCharIter!=fSCharIter && fCharIter!=fDCharIter) {
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// old fCharIter was adopted from the outside. Delete it.
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delete fCharIter;
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}
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fCharIter = fSCharIter;
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this->first();
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}
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/**
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* Provide a new UText for the input text. Must reference text with contents identical
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* to the original.
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* Intended for use with text data originating in Java (garbage collected) environments
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* where the data may be moved in memory at arbitrary times.
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*/
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RuleBasedBreakIterator &RuleBasedBreakIterator::refreshInputText(UText *input, UErrorCode &status) {
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if (U_FAILURE(status)) {
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return *this;
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}
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if (input == NULL) {
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status = U_ILLEGAL_ARGUMENT_ERROR;
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return *this;
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}
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int64_t pos = utext_getNativeIndex(fText);
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// Shallow read-only clone of the new UText into the existing input UText
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fText = utext_clone(fText, input, FALSE, TRUE, &status);
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if (U_FAILURE(status)) {
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return *this;
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}
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utext_setNativeIndex(fText, pos);
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if (utext_getNativeIndex(fText) != pos) {
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// Sanity check. The new input utext is supposed to have the exact same
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// contents as the old. If we can't set to the same position, it doesn't.
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// The contents underlying the old utext might be invalid at this point,
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// so it's not safe to check directly.
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status = U_ILLEGAL_ARGUMENT_ERROR;
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}
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return *this;
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}
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/**
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* Sets the current iteration position to the beginning of the text.
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* @return The offset of the beginning of the text.
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*/
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int32_t RuleBasedBreakIterator::first(void) {
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reset();
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fLastRuleStatusIndex = 0;
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fLastStatusIndexValid = TRUE;
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//if (fText == NULL)
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// return BreakIterator::DONE;
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utext_setNativeIndex(fText, 0);
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return 0;
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}
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/**
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* Sets the current iteration position to the end of the text.
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* @return The text's past-the-end offset.
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*/
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int32_t RuleBasedBreakIterator::last(void) {
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reset();
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if (fText == NULL) {
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fLastRuleStatusIndex = 0;
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fLastStatusIndexValid = TRUE;
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return BreakIterator::DONE;
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}
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fLastStatusIndexValid = FALSE;
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int32_t pos = (int32_t)utext_nativeLength(fText);
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utext_setNativeIndex(fText, pos);
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return pos;
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}
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/**
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* Advances the iterator either forward or backward the specified number of steps.
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* Negative values move backward, and positive values move forward. This is
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* equivalent to repeatedly calling next() or previous().
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|
* @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 = current();
|
|
while (n > 0) {
|
|
result = next();
|
|
--n;
|
|
}
|
|
while (n < 0) {
|
|
result = previous();
|
|
++n;
|
|
}
|
|
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) {
|
|
// if we have cached break positions and we're still in the range
|
|
// covered by them, just move one step forward in the cache
|
|
if (fCachedBreakPositions != NULL) {
|
|
if (fPositionInCache < fNumCachedBreakPositions - 1) {
|
|
++fPositionInCache;
|
|
int32_t pos = fCachedBreakPositions[fPositionInCache];
|
|
utext_setNativeIndex(fText, pos);
|
|
return pos;
|
|
}
|
|
else {
|
|
reset();
|
|
}
|
|
}
|
|
|
|
int32_t startPos = current();
|
|
int32_t result = handleNext(fData->fForwardTable);
|
|
if (fDictionaryCharCount > 0) {
|
|
result = checkDictionary(startPos, result, FALSE);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Advances the iterator backwards, to the last boundary preceding this one.
|
|
* @return The position of the last boundary position preceding this one.
|
|
*/
|
|
int32_t RuleBasedBreakIterator::previous(void) {
|
|
int32_t result;
|
|
int32_t startPos;
|
|
|
|
// if we have cached break positions and we're still in the range
|
|
// covered by them, just move one step backward in the cache
|
|
if (fCachedBreakPositions != NULL) {
|
|
if (fPositionInCache > 0) {
|
|
--fPositionInCache;
|
|
// If we're at the beginning of the cache, need to reevaluate the
|
|
// rule status
|
|
if (fPositionInCache <= 0) {
|
|
fLastStatusIndexValid = FALSE;
|
|
}
|
|
int32_t pos = fCachedBreakPositions[fPositionInCache];
|
|
utext_setNativeIndex(fText, pos);
|
|
return pos;
|
|
}
|
|
else {
|
|
reset();
|
|
}
|
|
}
|
|
|
|
// if we're already sitting at the beginning of the text, return DONE
|
|
if (fText == NULL || (startPos = current()) == 0) {
|
|
fLastRuleStatusIndex = 0;
|
|
fLastStatusIndexValid = TRUE;
|
|
return BreakIterator::DONE;
|
|
}
|
|
|
|
if (fData->fSafeRevTable != NULL || fData->fSafeFwdTable != NULL) {
|
|
result = handlePrevious(fData->fReverseTable);
|
|
if (fDictionaryCharCount > 0) {
|
|
result = checkDictionary(result, startPos, TRUE);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
// old rule syntax
|
|
// set things up. handlePrevious() will back us up to some valid
|
|
// break position before the current position (we back our internal
|
|
// iterator up one step to prevent handlePrevious() from returning
|
|
// the current position), but not necessarily the last one before
|
|
|
|
// where we started
|
|
|
|
int32_t start = current();
|
|
|
|
(void)UTEXT_PREVIOUS32(fText);
|
|
int32_t lastResult = handlePrevious(fData->fReverseTable);
|
|
if (lastResult == UBRK_DONE) {
|
|
lastResult = 0;
|
|
utext_setNativeIndex(fText, 0);
|
|
}
|
|
result = lastResult;
|
|
int32_t lastTag = 0;
|
|
UBool breakTagValid = FALSE;
|
|
|
|
// iterate forward from the known break position until we pass our
|
|
// starting point. The last break position before the starting
|
|
// point is our return value
|
|
|
|
for (;;) {
|
|
result = next();
|
|
if (result == BreakIterator::DONE || result >= start) {
|
|
break;
|
|
}
|
|
lastResult = result;
|
|
lastTag = fLastRuleStatusIndex;
|
|
breakTagValid = TRUE;
|
|
}
|
|
|
|
// fLastBreakTag wants to have the value for section of text preceding
|
|
// the result position that we are to return (in lastResult.) If
|
|
// the backwards rules overshot and the above loop had to do two or more
|
|
// next()s to move up to the desired return position, we will have a valid
|
|
// tag value. But, if handlePrevious() took us to exactly the correct result positon,
|
|
// we wont have a tag value for that position, which is only set by handleNext().
|
|
|
|
// set the current iteration position to be the last break position
|
|
// before where we started, and then return that value
|
|
utext_setNativeIndex(fText, lastResult);
|
|
fLastRuleStatusIndex = lastTag; // for use by getRuleStatus()
|
|
fLastStatusIndexValid = breakTagValid;
|
|
|
|
// No need to check the dictionary; it will have been handled by
|
|
// next()
|
|
|
|
return lastResult;
|
|
}
|
|
|
|
/**
|
|
* Sets the iterator to refer to the first boundary position following
|
|
* the specified position.
|
|
* @offset 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 offset) {
|
|
// if we have cached break positions and offset is in the range
|
|
// covered by them, use them
|
|
// TODO: could use binary search
|
|
// TODO: what if offset is outside range, but break is not?
|
|
if (fCachedBreakPositions != NULL) {
|
|
if (offset >= fCachedBreakPositions[0]
|
|
&& offset < fCachedBreakPositions[fNumCachedBreakPositions - 1]) {
|
|
fPositionInCache = 0;
|
|
// We are guaranteed not to leave the array due to range test above
|
|
while (offset >= fCachedBreakPositions[fPositionInCache]) {
|
|
++fPositionInCache;
|
|
}
|
|
int32_t pos = fCachedBreakPositions[fPositionInCache];
|
|
utext_setNativeIndex(fText, pos);
|
|
return pos;
|
|
}
|
|
else {
|
|
reset();
|
|
}
|
|
}
|
|
|
|
// if the offset passed in is already past the end of the text,
|
|
// just return DONE; if it's before the beginning, return the
|
|
// text's starting offset
|
|
fLastRuleStatusIndex = 0;
|
|
fLastStatusIndexValid = TRUE;
|
|
if (fText == NULL || offset >= utext_nativeLength(fText)) {
|
|
last();
|
|
return next();
|
|
}
|
|
else if (offset < 0) {
|
|
return first();
|
|
}
|
|
|
|
// otherwise, set our internal iteration position (temporarily)
|
|
// to the position passed in. If this is the _beginning_ position,
|
|
// then we can just use next() to get our return value
|
|
|
|
int32_t result = 0;
|
|
|
|
if (fData->fSafeRevTable != NULL) {
|
|
// new rule syntax
|
|
utext_setNativeIndex(fText, offset);
|
|
// move forward one codepoint to prepare for moving back to a
|
|
// safe point.
|
|
// this handles offset being between a supplementary character
|
|
(void)UTEXT_NEXT32(fText);
|
|
// handlePrevious will move most of the time to < 1 boundary away
|
|
handlePrevious(fData->fSafeRevTable);
|
|
int32_t result = next();
|
|
while (result <= offset) {
|
|
result = next();
|
|
}
|
|
return result;
|
|
}
|
|
if (fData->fSafeFwdTable != NULL) {
|
|
// backup plan if forward safe table is not available
|
|
utext_setNativeIndex(fText, offset);
|
|
(void)UTEXT_PREVIOUS32(fText);
|
|
// handle next will give result >= offset
|
|
handleNext(fData->fSafeFwdTable);
|
|
// previous will give result 0 or 1 boundary away from offset,
|
|
// most of the time
|
|
// we have to
|
|
int32_t oldresult = previous();
|
|
while (oldresult > offset) {
|
|
int32_t result = previous();
|
|
if (result <= offset) {
|
|
return oldresult;
|
|
}
|
|
oldresult = result;
|
|
}
|
|
int32_t result = next();
|
|
if (result <= offset) {
|
|
return next();
|
|
}
|
|
return result;
|
|
}
|
|
// otherwise, we have to sync up first. Use handlePrevious() to back
|
|
// up to a known break position before the specified position (if
|
|
// we can determine that the specified position is a break position,
|
|
// we don't back up at all). This may or may not be the last break
|
|
// position at or before our starting position. Advance forward
|
|
// from here until we've passed the starting position. The position
|
|
// we stop on will be the first break position after the specified one.
|
|
// old rule syntax
|
|
|
|
utext_setNativeIndex(fText, offset);
|
|
if (offset==0 ||
|
|
(offset==1 && utext_getNativeIndex(fText)==0)) {
|
|
return next();
|
|
}
|
|
result = previous();
|
|
|
|
while (result != BreakIterator::DONE && result <= offset) {
|
|
result = next();
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Sets the iterator to refer to the last boundary position before the
|
|
* specified position.
|
|
* @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 we have cached break positions and offset is in the range
|
|
// covered by them, use them
|
|
if (fCachedBreakPositions != NULL) {
|
|
// TODO: binary search?
|
|
// TODO: What if offset is outside range, but break is not?
|
|
if (offset > fCachedBreakPositions[0]
|
|
&& offset <= fCachedBreakPositions[fNumCachedBreakPositions - 1]) {
|
|
fPositionInCache = 0;
|
|
while (fPositionInCache < fNumCachedBreakPositions
|
|
&& offset > fCachedBreakPositions[fPositionInCache])
|
|
++fPositionInCache;
|
|
--fPositionInCache;
|
|
// If we're at the beginning of the cache, need to reevaluate the
|
|
// rule status
|
|
if (fPositionInCache <= 0) {
|
|
fLastStatusIndexValid = FALSE;
|
|
}
|
|
utext_setNativeIndex(fText, fCachedBreakPositions[fPositionInCache]);
|
|
return fCachedBreakPositions[fPositionInCache];
|
|
}
|
|
else {
|
|
reset();
|
|
}
|
|
}
|
|
|
|
// if the offset passed in is already past the end of the text,
|
|
// just return DONE; if it's before the beginning, return the
|
|
// text's starting offset
|
|
if (fText == NULL || offset > utext_nativeLength(fText)) {
|
|
// return BreakIterator::DONE;
|
|
return last();
|
|
}
|
|
else if (offset < 0) {
|
|
return first();
|
|
}
|
|
|
|
// if we start by updating the current iteration position to the
|
|
// position specified by the caller, we can just use previous()
|
|
// to carry out this operation
|
|
|
|
if (fData->fSafeFwdTable != NULL) {
|
|
// new rule syntax
|
|
utext_setNativeIndex(fText, offset);
|
|
int32_t newOffset = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
if (newOffset != offset) {
|
|
// Will come here if specified offset was not a code point boundary AND
|
|
// the underlying implmentation is using UText, which snaps any non-code-point-boundary
|
|
// indices to the containing code point.
|
|
// For breakitereator::preceding only, these non-code-point indices need to be moved
|
|
// up to refer to the following codepoint.
|
|
(void)UTEXT_NEXT32(fText);
|
|
offset = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
}
|
|
|
|
// TODO: (synwee) would it be better to just check for being in the middle of a surrogate pair,
|
|
// rather than adjusting the position unconditionally?
|
|
// (Change would interact with safe rules.)
|
|
// TODO: change RBBI behavior for off-boundary indices to match that of UText?
|
|
// affects only preceding(), seems cleaner, but is slightly different.
|
|
(void)UTEXT_PREVIOUS32(fText);
|
|
handleNext(fData->fSafeFwdTable);
|
|
int32_t result = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
while (result >= offset) {
|
|
result = previous();
|
|
}
|
|
return result;
|
|
}
|
|
if (fData->fSafeRevTable != NULL) {
|
|
// backup plan if forward safe table is not available
|
|
// TODO: check whether this path can be discarded
|
|
// It's probably OK to say that rules must supply both safe tables
|
|
// if they use safe tables at all. We have certainly never described
|
|
// to anyone how to work with just one safe table.
|
|
utext_setNativeIndex(fText, offset);
|
|
(void)UTEXT_NEXT32(fText);
|
|
|
|
// handle previous will give result <= offset
|
|
handlePrevious(fData->fSafeRevTable);
|
|
|
|
// next will give result 0 or 1 boundary away from offset,
|
|
// most of the time
|
|
// we have to
|
|
int32_t oldresult = next();
|
|
while (oldresult < offset) {
|
|
int32_t result = next();
|
|
if (result >= offset) {
|
|
return oldresult;
|
|
}
|
|
oldresult = result;
|
|
}
|
|
int32_t result = previous();
|
|
if (result >= offset) {
|
|
return previous();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
// old rule syntax
|
|
utext_setNativeIndex(fText, offset);
|
|
return previous();
|
|
}
|
|
|
|
/**
|
|
* 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) {
|
|
// the beginning index of the iterator is always a boundary position by definition
|
|
if (offset == 0) {
|
|
first(); // For side effects on current position, tag values.
|
|
return TRUE;
|
|
}
|
|
|
|
if (offset == (int32_t)utext_nativeLength(fText)) {
|
|
last(); // For side effects on current position, tag values.
|
|
return TRUE;
|
|
}
|
|
|
|
// out-of-range indexes are never boundary positions
|
|
if (offset < 0) {
|
|
first(); // For side effects on current position, tag values.
|
|
return FALSE;
|
|
}
|
|
|
|
if (offset > utext_nativeLength(fText)) {
|
|
last(); // For side effects on current position, tag values.
|
|
return FALSE;
|
|
}
|
|
|
|
// otherwise, we can use following() on the position before the specified
|
|
// one and return true if the position we get back is the one the user
|
|
// specified
|
|
utext_previous32From(fText, offset);
|
|
int32_t backOne = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
UBool result = following(backOne) == offset;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Returns the current iteration position.
|
|
* @return The current iteration position.
|
|
*/
|
|
int32_t RuleBasedBreakIterator::current(void) const {
|
|
int32_t pos = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
return pos;
|
|
}
|
|
|
|
//=======================================================================
|
|
// 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.
|
|
};
|
|
|
|
|
|
//-----------------------------------------------------------------------------------
|
|
//
|
|
// handleNext(stateTable)
|
|
// This method is the actual implementation of the rbbi next() method.
|
|
// This method initializes the state machine to state 1
|
|
// and advances through the text character by character until we reach the end
|
|
// of the text or the state machine transitions to state 0. We update our return
|
|
// value every time the state machine passes through an accepting state.
|
|
//
|
|
//-----------------------------------------------------------------------------------
|
|
int32_t RuleBasedBreakIterator::handleNext(const RBBIStateTable *statetable) {
|
|
int32_t state;
|
|
int16_t category = 0;
|
|
RBBIRunMode mode;
|
|
|
|
RBBIStateTableRow *row;
|
|
UChar32 c;
|
|
int32_t lookaheadStatus = 0;
|
|
int32_t lookaheadTagIdx = 0;
|
|
int32_t result = 0;
|
|
int32_t initialPosition = 0;
|
|
int32_t lookaheadResult = 0;
|
|
UBool lookAheadHardBreak = (statetable->fFlags & RBBI_LOOKAHEAD_HARD_BREAK) != 0;
|
|
const char *tableData = statetable->fTableData;
|
|
uint32_t tableRowLen = statetable->fRowLen;
|
|
|
|
#ifdef RBBI_DEBUG
|
|
if (fTrace) {
|
|
RBBIDebugPuts("Handle Next pos char state category");
|
|
}
|
|
#endif
|
|
|
|
// No matter what, handleNext alway correctly sets the break tag value.
|
|
fLastStatusIndexValid = TRUE;
|
|
fLastRuleStatusIndex = 0;
|
|
|
|
// if we're already at the end of the text, return DONE.
|
|
initialPosition = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
result = initialPosition;
|
|
c = UTEXT_NEXT32(fText);
|
|
if (fData == NULL || c==U_SENTINEL) {
|
|
return BreakIterator::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.
|
|
if (lookaheadResult > result) {
|
|
// We ran off the end of the string with a pending look-ahead match.
|
|
// Treat this as if the look-ahead condition had been met, and return
|
|
// the match at the / position from the look-ahead rule.
|
|
result = lookaheadResult;
|
|
fLastRuleStatusIndex = lookaheadTagIdx;
|
|
lookaheadStatus = 0;
|
|
}
|
|
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.
|
|
//
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
|
|
// Check the dictionary bit in the character's category.
|
|
// Counter is only used by dictionary based iterators (subclasses).
|
|
// 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 (fTrace) {
|
|
RBBIDebugPrintf(" %4ld ", 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
|
|
//
|
|
|
|
// Note: fNextState is defined as uint16_t[2], but we are casting
|
|
// a generated RBBI table to RBBIStateTableRow and some tables
|
|
// actually have more than 2 categories.
|
|
U_ASSERT(category<fData->fHeader->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);
|
|
}
|
|
fLastRuleStatusIndex = row->fTagIdx; // Remember the break status (tag) values.
|
|
}
|
|
|
|
if (row->fLookAhead != 0) {
|
|
if (lookaheadStatus != 0
|
|
&& row->fAccepting == lookaheadStatus) {
|
|
// Lookahead match is completed.
|
|
result = lookaheadResult;
|
|
fLastRuleStatusIndex = lookaheadTagIdx;
|
|
lookaheadStatus = 0;
|
|
// TODO: make a standalone hard break in a rule work.
|
|
if (lookAheadHardBreak) {
|
|
UTEXT_SETNATIVEINDEX(fText, result);
|
|
return result;
|
|
}
|
|
// Look-ahead completed, but other rules may match further. Continue on
|
|
// TODO: junk this feature? I don't think it's used anywhwere.
|
|
goto continueOn;
|
|
}
|
|
|
|
int32_t r = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
lookaheadResult = r;
|
|
lookaheadStatus = row->fLookAhead;
|
|
lookaheadTagIdx = row->fTagIdx;
|
|
goto continueOn;
|
|
}
|
|
|
|
|
|
if (row->fAccepting != 0) {
|
|
// Because this is an accepting state, any in-progress look-ahead match
|
|
// is no longer relavant. Clear out the pending lookahead status.
|
|
lookaheadStatus = 0; // clear out any pending look-ahead match.
|
|
}
|
|
|
|
continueOn:
|
|
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);
|
|
}
|
|
|
|
// Leave the iterator at our result position.
|
|
UTEXT_SETNATIVEINDEX(fText, result);
|
|
#ifdef RBBI_DEBUG
|
|
if (fTrace) {
|
|
RBBIDebugPrintf("result = %d\n\n", result);
|
|
}
|
|
#endif
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
//-----------------------------------------------------------------------------------
|
|
//
|
|
// handlePrevious()
|
|
//
|
|
// Iterate backwards, according to the logic of the reverse rules.
|
|
// This version handles the exact style backwards rules.
|
|
//
|
|
// The logic of this function is very similar to handleNext(), above.
|
|
//
|
|
//-----------------------------------------------------------------------------------
|
|
int32_t RuleBasedBreakIterator::handlePrevious(const RBBIStateTable *statetable) {
|
|
int32_t state;
|
|
int16_t category = 0;
|
|
RBBIRunMode mode;
|
|
RBBIStateTableRow *row;
|
|
UChar32 c;
|
|
int32_t lookaheadStatus = 0;
|
|
int32_t result = 0;
|
|
int32_t initialPosition = 0;
|
|
int32_t lookaheadResult = 0;
|
|
UBool lookAheadHardBreak = (statetable->fFlags & RBBI_LOOKAHEAD_HARD_BREAK) != 0;
|
|
|
|
#ifdef RBBI_DEBUG
|
|
if (fTrace) {
|
|
RBBIDebugPuts("Handle Previous pos char state category");
|
|
}
|
|
#endif
|
|
|
|
// handlePrevious() never gets the rule status.
|
|
// Flag the status as invalid; if the user ever asks for status, we will need
|
|
// to back up, then re-find the break position using handleNext(), which does
|
|
// get the status value.
|
|
fLastStatusIndexValid = FALSE;
|
|
fLastRuleStatusIndex = 0;
|
|
|
|
// if we're already at the start of the text, return DONE.
|
|
if (fText == NULL || fData == NULL || UTEXT_GETNATIVEINDEX(fText)==0) {
|
|
return BreakIterator::DONE;
|
|
}
|
|
|
|
// Set up the starting char.
|
|
initialPosition = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
result = initialPosition;
|
|
c = UTEXT_PREVIOUS32(fText);
|
|
|
|
// Set the initial state for the state machine
|
|
state = START_STATE;
|
|
row = (RBBIStateTableRow *)
|
|
(statetable->fTableData + (statetable->fRowLen * state));
|
|
category = 3;
|
|
mode = RBBI_RUN;
|
|
if (statetable->fFlags & RBBI_BOF_REQUIRED) {
|
|
category = 2;
|
|
mode = RBBI_START;
|
|
}
|
|
|
|
|
|
// loop until we reach the start 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.
|
|
if (lookaheadResult < result) {
|
|
// We ran off the end of the string with a pending look-ahead match.
|
|
// Treat this as if the look-ahead condition had been met, and return
|
|
// the match at the / position from the look-ahead rule.
|
|
result = lookaheadResult;
|
|
lookaheadStatus = 0;
|
|
} else if (result == initialPosition) {
|
|
// Ran off start, no match found.
|
|
// move one index one (towards the start, since we are doing a previous())
|
|
UTEXT_SETNATIVEINDEX(fText, initialPosition);
|
|
(void)UTEXT_PREVIOUS32(fText); // TODO: shouldn't be necessary. We're already at beginning. Check.
|
|
}
|
|
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.
|
|
//
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
|
|
// Check the dictionary bit in the character's category.
|
|
// Counter is only used by dictionary based iterators (subclasses).
|
|
// 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 (fTrace) {
|
|
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
|
|
//
|
|
|
|
// Note: fNextState is defined as uint16_t[2], but we are casting
|
|
// a generated RBBI table to RBBIStateTableRow and some tables
|
|
// actually have more than 2 categories.
|
|
U_ASSERT(category<fData->fHeader->fCatCount);
|
|
state = row->fNextState[category]; /*Not accessing beyond memory*/
|
|
row = (RBBIStateTableRow *)
|
|
(statetable->fTableData + (statetable->fRowLen * state));
|
|
|
|
if (row->fAccepting == -1) {
|
|
// Match found, common case.
|
|
result = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
}
|
|
|
|
if (row->fLookAhead != 0) {
|
|
if (lookaheadStatus != 0
|
|
&& row->fAccepting == lookaheadStatus) {
|
|
// Lookahead match is completed.
|
|
result = lookaheadResult;
|
|
lookaheadStatus = 0;
|
|
// TODO: make a standalone hard break in a rule work.
|
|
if (lookAheadHardBreak) {
|
|
UTEXT_SETNATIVEINDEX(fText, result);
|
|
return result;
|
|
}
|
|
// Look-ahead completed, but other rules may match further. Continue on
|
|
// TODO: junk this feature? I don't think it's used anywhwere.
|
|
goto continueOn;
|
|
}
|
|
|
|
int32_t r = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
lookaheadResult = r;
|
|
lookaheadStatus = row->fLookAhead;
|
|
goto continueOn;
|
|
}
|
|
|
|
|
|
if (row->fAccepting != 0) {
|
|
// Because this is an accepting state, any in-progress look-ahead match
|
|
// is no longer relavant. Clear out the pending lookahead status.
|
|
lookaheadStatus = 0;
|
|
}
|
|
|
|
continueOn:
|
|
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;
|
|
}
|
|
|
|
// Move (backwards) to the next character to process.
|
|
// 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_PREVIOUS32(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_PREVIOUS32(fText);
|
|
result = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
}
|
|
|
|
// Leave the iterator at our result position.
|
|
UTEXT_SETNATIVEINDEX(fText, result);
|
|
#ifdef RBBI_DEBUG
|
|
if (fTrace) {
|
|
RBBIDebugPrintf("result = %d\n\n", result);
|
|
}
|
|
#endif
|
|
return result;
|
|
}
|
|
|
|
|
|
void
|
|
RuleBasedBreakIterator::reset()
|
|
{
|
|
if (fCachedBreakPositions) {
|
|
uprv_free(fCachedBreakPositions);
|
|
}
|
|
fCachedBreakPositions = NULL;
|
|
fNumCachedBreakPositions = 0;
|
|
fDictionaryCharCount = 0;
|
|
fPositionInCache = 0;
|
|
}
|
|
|
|
|
|
|
|
//-------------------------------------------------------------------------------
|
|
//
|
|
// 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.
|
|
//
|
|
// If no cached status value is available, the status is
|
|
// found by doing a previous() followed by a next(), which
|
|
// leaves the iterator where it started, and computes the
|
|
// status while doing the next().
|
|
//
|
|
//-------------------------------------------------------------------------------
|
|
void RuleBasedBreakIterator::makeRuleStatusValid() {
|
|
if (fLastStatusIndexValid == FALSE) {
|
|
// No cached status is available.
|
|
if (fText == NULL || current() == 0) {
|
|
// At start of text, or there is no text. Status is always zero.
|
|
fLastRuleStatusIndex = 0;
|
|
fLastStatusIndexValid = TRUE;
|
|
} else {
|
|
// Not at start of text. Find status the tedious way.
|
|
int32_t pa = current();
|
|
previous();
|
|
if (fNumCachedBreakPositions > 0) {
|
|
reset(); // Blow off the dictionary cache
|
|
}
|
|
int32_t pb = next();
|
|
if (pa != pb) {
|
|
// note: the if (pa != pb) test is here only to eliminate warnings for
|
|
// unused local variables on gcc. Logically, it isn't needed.
|
|
U_ASSERT(pa == pb);
|
|
}
|
|
}
|
|
}
|
|
U_ASSERT(fLastRuleStatusIndex >= 0 && fLastRuleStatusIndex < fData->fStatusMaxIdx);
|
|
}
|
|
|
|
|
|
int32_t RuleBasedBreakIterator::getRuleStatus() const {
|
|
RuleBasedBreakIterator *nonConstThis = (RuleBasedBreakIterator *)this;
|
|
nonConstThis->makeRuleStatusValid();
|
|
|
|
// 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 = fLastRuleStatusIndex + fData->fRuleStatusTable[fLastRuleStatusIndex];
|
|
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;
|
|
}
|
|
|
|
RuleBasedBreakIterator *nonConstThis = (RuleBasedBreakIterator *)this;
|
|
nonConstThis->makeRuleStatusValid();
|
|
int32_t numVals = fData->fRuleStatusTable[fLastRuleStatusIndex];
|
|
int32_t numValsToCopy = numVals;
|
|
if (numVals > capacity) {
|
|
status = U_BUFFER_OVERFLOW_ERROR;
|
|
numValsToCopy = capacity;
|
|
}
|
|
int i;
|
|
for (i=0; i<numValsToCopy; i++) {
|
|
fillInVec[i] = fData->fRuleStatusTable[fLastRuleStatusIndex + 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;
|
|
}
|
|
|
|
|
|
|
|
|
|
//-------------------------------------------------------------------------------
|
|
//
|
|
// BufferClone TODO: In my (Andy) opinion, this function should be deprecated.
|
|
// Saving one heap allocation isn't worth the trouble.
|
|
// Cloning shouldn't be done in tight loops, and
|
|
// making the clone copy involves other heap operations anyway.
|
|
// And the application code for correctly dealing with buffer
|
|
// size problems and the eventual object destruction is ugly.
|
|
//
|
|
//-------------------------------------------------------------------------------
|
|
BreakIterator * RuleBasedBreakIterator::createBufferClone(void *stackBuffer,
|
|
int32_t &bufferSize,
|
|
UErrorCode &status)
|
|
{
|
|
if (U_FAILURE(status)){
|
|
return NULL;
|
|
}
|
|
|
|
//
|
|
// If user buffer size is zero this is a preflight operation to
|
|
// obtain the needed buffer size, allowing for worst case misalignment.
|
|
//
|
|
if (bufferSize == 0) {
|
|
bufferSize = sizeof(RuleBasedBreakIterator) + U_ALIGNMENT_OFFSET_UP(0);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
//
|
|
// Check the alignment and size of the user supplied buffer.
|
|
// Allocate heap memory if the user supplied memory is insufficient.
|
|
//
|
|
char *buf = (char *)stackBuffer;
|
|
uint32_t s = bufferSize;
|
|
|
|
if (stackBuffer == NULL) {
|
|
s = 0; // Ignore size, force allocation if user didn't give us a buffer.
|
|
}
|
|
if (U_ALIGNMENT_OFFSET(stackBuffer) != 0) {
|
|
uint32_t offsetUp = (uint32_t)U_ALIGNMENT_OFFSET_UP(buf);
|
|
s -= offsetUp;
|
|
buf += offsetUp;
|
|
}
|
|
if (s < sizeof(RuleBasedBreakIterator)) {
|
|
// Not enough room in the caller-supplied buffer.
|
|
// Do a plain-vanilla heap based clone and return that, along with
|
|
// a warning that the clone was allocated.
|
|
RuleBasedBreakIterator *clonedBI = new RuleBasedBreakIterator(*this);
|
|
if (clonedBI == 0) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
} else {
|
|
status = U_SAFECLONE_ALLOCATED_WARNING;
|
|
}
|
|
return clonedBI;
|
|
}
|
|
|
|
//
|
|
// Clone the source BI into the caller-supplied buffer.
|
|
//
|
|
RuleBasedBreakIterator *clone = new(buf) RuleBasedBreakIterator(*this);
|
|
clone->fBufferClone = TRUE; // Flag to prevent deleting storage on close (From C code)
|
|
|
|
return clone;
|
|
}
|
|
|
|
|
|
//-------------------------------------------------------------------------------
|
|
//
|
|
// isDictionaryChar Return true if the category lookup for this char
|
|
// indicates that it is in the set of dictionary lookup
|
|
// chars.
|
|
//
|
|
// This function is intended for use by dictionary based
|
|
// break iterators.
|
|
//
|
|
//-------------------------------------------------------------------------------
|
|
/*UBool RuleBasedBreakIterator::isDictionaryChar(UChar32 c) {
|
|
if (fData == NULL) {
|
|
return FALSE;
|
|
}
|
|
uint16_t category;
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
return (category & 0x4000) != 0;
|
|
}*/
|
|
|
|
|
|
//-------------------------------------------------------------------------------
|
|
//
|
|
// checkDictionary This function handles all processing of characters in
|
|
// the "dictionary" set. It will determine the appropriate
|
|
// course of action, and possibly set up a cache in the
|
|
// process.
|
|
//
|
|
//-------------------------------------------------------------------------------
|
|
int32_t RuleBasedBreakIterator::checkDictionary(int32_t startPos,
|
|
int32_t endPos,
|
|
UBool reverse) {
|
|
// Reset the old break cache first.
|
|
uint32_t dictionaryCount = fDictionaryCharCount;
|
|
reset();
|
|
|
|
if (dictionaryCount <= 1 || (endPos - startPos) <= 1) {
|
|
return (reverse ? startPos : endPos);
|
|
}
|
|
|
|
// Bug 5532. The dictionary code will crash if the input text is UTF-8
|
|
// because native indexes are different from UTF-16 indexes.
|
|
// Temporary hack: skip dictionary lookup for UTF-8 encoded text.
|
|
// It wont give the right breaks, but it's better than a crash.
|
|
//
|
|
// Check the type of the UText by checking its pFuncs field, which
|
|
// is UText's function dispatch table. It will be the same for all
|
|
// UTF-8 UTexts and different for any other UText type.
|
|
//
|
|
// We have no other type of UText available with non-UTF-16 native indexing.
|
|
// This whole check will go away once the dictionary code is fixed.
|
|
static const void *utext_utf8Funcs;
|
|
if (utext_utf8Funcs == NULL) {
|
|
// Cache the UTF-8 UText function pointer value.
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
UText tempUText = UTEXT_INITIALIZER;
|
|
utext_openUTF8(&tempUText, NULL, 0, &status);
|
|
utext_utf8Funcs = tempUText.pFuncs;
|
|
utext_close(&tempUText);
|
|
}
|
|
if (fText->pFuncs == utext_utf8Funcs) {
|
|
return (reverse ? startPos : endPos);
|
|
}
|
|
|
|
// Starting from the starting point, scan towards the proposed result,
|
|
// looking for the first dictionary character (which may be the one
|
|
// we're on, if we're starting in the middle of a range).
|
|
utext_setNativeIndex(fText, reverse ? endPos : startPos);
|
|
if (reverse) {
|
|
UTEXT_PREVIOUS32(fText);
|
|
}
|
|
|
|
int32_t rangeStart = startPos;
|
|
int32_t rangeEnd = endPos;
|
|
|
|
uint16_t category;
|
|
int32_t current;
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
UStack breaks(status);
|
|
int32_t foundBreakCount = 0;
|
|
UChar32 c = utext_current32(fText);
|
|
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
|
|
// Is the character we're starting on a dictionary character? If so, we
|
|
// need to back up to include the entire run; otherwise the results of
|
|
// the break algorithm will differ depending on where we start. Since
|
|
// the result is cached and there is typically a non-dictionary break
|
|
// within a small number of words, there should be little performance impact.
|
|
if (category & 0x4000) {
|
|
if (reverse) {
|
|
do {
|
|
utext_next32(fText); // TODO: recast to work directly with postincrement.
|
|
c = utext_current32(fText);
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
} while (c != U_SENTINEL && (category & 0x4000));
|
|
// Back up to the last dictionary character
|
|
rangeEnd = (int32_t)UTEXT_GETNATIVEINDEX(fText);
|
|
if (c == U_SENTINEL) {
|
|
// c = fText->last32();
|
|
// TODO: why was this if needed?
|
|
c = UTEXT_PREVIOUS32(fText);
|
|
}
|
|
else {
|
|
c = UTEXT_PREVIOUS32(fText);
|
|
}
|
|
}
|
|
else {
|
|
do {
|
|
c = UTEXT_PREVIOUS32(fText);
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
}
|
|
while (c != U_SENTINEL && (category & 0x4000));
|
|
// Back up to the last dictionary character
|
|
if (c == U_SENTINEL) {
|
|
// c = fText->first32();
|
|
c = utext_current32(fText);
|
|
}
|
|
else {
|
|
utext_next32(fText);
|
|
c = utext_current32(fText);
|
|
}
|
|
rangeStart = (int32_t)UTEXT_GETNATIVEINDEX(fText);;
|
|
}
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
}
|
|
|
|
// Loop through the text, looking for ranges of dictionary characters.
|
|
// For each span, find the appropriate break engine, and ask it to find
|
|
// any breaks within the span.
|
|
// Note: we always do this in the forward direction, so that the break
|
|
// cache is built in the right order.
|
|
if (reverse) {
|
|
utext_setNativeIndex(fText, rangeStart);
|
|
c = utext_current32(fText);
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
}
|
|
while(U_SUCCESS(status)) {
|
|
while((current = (int32_t)UTEXT_GETNATIVEINDEX(fText)) < rangeEnd && (category & 0x4000) == 0) {
|
|
utext_next32(fText); // TODO: tweak for post-increment operation
|
|
c = utext_current32(fText);
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
}
|
|
if (current >= rangeEnd) {
|
|
break;
|
|
}
|
|
|
|
// We now have a dictionary character. Get the appropriate language object
|
|
// to deal with it.
|
|
const LanguageBreakEngine *lbe = getLanguageBreakEngine(c);
|
|
|
|
// Ask the language object if there are any breaks. It will leave the text
|
|
// pointer on the other side of its range, ready to search for the next one.
|
|
if (lbe != NULL) {
|
|
foundBreakCount += lbe->findBreaks(fText, rangeStart, rangeEnd, FALSE, fBreakType, breaks);
|
|
}
|
|
|
|
// Reload the loop variables for the next go-round
|
|
c = utext_current32(fText);
|
|
UTRIE_GET16(&fData->fTrie, c, category);
|
|
}
|
|
|
|
// If we found breaks, build a new break cache. The first and last entries must
|
|
// be the original starting and ending position.
|
|
if (foundBreakCount > 0) {
|
|
int32_t totalBreaks = foundBreakCount;
|
|
if (startPos < breaks.elementAti(0)) {
|
|
totalBreaks += 1;
|
|
}
|
|
if (endPos > breaks.peeki()) {
|
|
totalBreaks += 1;
|
|
}
|
|
fCachedBreakPositions = (int32_t *)uprv_malloc(totalBreaks * sizeof(int32_t));
|
|
if (fCachedBreakPositions != NULL) {
|
|
int32_t out = 0;
|
|
fNumCachedBreakPositions = totalBreaks;
|
|
if (startPos < breaks.elementAti(0)) {
|
|
fCachedBreakPositions[out++] = startPos;
|
|
}
|
|
for (int32_t i = 0; i < foundBreakCount; ++i) {
|
|
fCachedBreakPositions[out++] = breaks.elementAti(i);
|
|
}
|
|
if (endPos > fCachedBreakPositions[out-1]) {
|
|
fCachedBreakPositions[out] = endPos;
|
|
}
|
|
// If there are breaks, then by definition, we are replacing the original
|
|
// proposed break by one of the breaks we found. Use following() and
|
|
// preceding() to do the work. They should never recurse in this case.
|
|
if (reverse) {
|
|
return preceding(endPos - 1);
|
|
}
|
|
else {
|
|
return following(startPos);
|
|
}
|
|
}
|
|
// If the allocation failed, just fall through to the "no breaks found" case.
|
|
}
|
|
|
|
// If we get here, there were no language-based breaks. Set the text pointer
|
|
// to the original proposed break.
|
|
utext_setNativeIndex(fText, reverse ? startPos : endPos);
|
|
return (reverse ? startPos : endPos);
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
// defined in ucln_cmn.h
|
|
|
|
static icu::UStack *gLanguageBreakFactories = NULL;
|
|
|
|
/**
|
|
* Release all static memory held by breakiterator.
|
|
*/
|
|
U_CDECL_BEGIN
|
|
static UBool U_CALLCONV breakiterator_cleanup_dict(void) {
|
|
if (gLanguageBreakFactories) {
|
|
delete gLanguageBreakFactories;
|
|
gLanguageBreakFactories = NULL;
|
|
}
|
|
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 const LanguageBreakEngine*
|
|
getLanguageBreakEngineFromFactory(UChar32 c, int32_t breakType)
|
|
{
|
|
UBool needsInit;
|
|
UErrorCode status = U_ZERO_ERROR;
|
|
UMTX_CHECK(NULL, (UBool)(gLanguageBreakFactories == NULL), needsInit);
|
|
|
|
if (needsInit) {
|
|
UStack *factories = new UStack(_deleteFactory, NULL, status);
|
|
if (factories != NULL && U_SUCCESS(status)) {
|
|
ICULanguageBreakFactory *builtIn = new ICULanguageBreakFactory(status);
|
|
factories->push(builtIn, status);
|
|
#ifdef U_LOCAL_SERVICE_HOOK
|
|
LanguageBreakFactory *extra = (LanguageBreakFactory *)uprv_svc_hook("languageBreakFactory", &status);
|
|
if (extra != NULL) {
|
|
factories->push(extra, status);
|
|
}
|
|
#endif
|
|
}
|
|
umtx_lock(NULL);
|
|
if (gLanguageBreakFactories == NULL) {
|
|
gLanguageBreakFactories = factories;
|
|
factories = NULL;
|
|
ucln_common_registerCleanup(UCLN_COMMON_BREAKITERATOR_DICT, breakiterator_cleanup_dict);
|
|
}
|
|
umtx_unlock(NULL);
|
|
delete factories;
|
|
}
|
|
|
|
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, breakType);
|
|
if (lbe != NULL) {
|
|
break;
|
|
}
|
|
}
|
|
return lbe;
|
|
}
|
|
|
|
|
|
//-------------------------------------------------------------------------------
|
|
//
|
|
// getLanguageBreakEngine Find an appropriate LanguageBreakEngine for the
|
|
// the characer 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, fBreakType)) {
|
|
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, fBreakType);
|
|
|
|
// 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;
|
|
}
|
|
// 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, fBreakType);
|
|
|
|
return fUnhandledBreakEngine;
|
|
}
|
|
|
|
|
|
|
|
/*int32_t RuleBasedBreakIterator::getBreakType() const {
|
|
return fBreakType;
|
|
}*/
|
|
|
|
void RuleBasedBreakIterator::setBreakType(int32_t type) {
|
|
fBreakType = type;
|
|
reset();
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
|