151 lines
4.4 KiB
C++
151 lines
4.4 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999 IBM Corp. All rights reserved.
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**********************************************************************
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* Date Name Description
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* 11/11/99 rgillam Complete port from Java.
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**********************************************************************
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*/
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#include "ucmp8.h"
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#include "cmemory.h"
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#include "rbbi_tbl.h"
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U_NAMESPACE_BEGIN
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//=======================================================================
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// constructor
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//=======================================================================
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RuleBasedBreakIteratorTables::RuleBasedBreakIteratorTables(UDataMemory* memory)
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: refCount(0),
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ownTables(FALSE)
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{
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if(memory != 0) {
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fMemory = memory;
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const void* image = udata_getMemory(memory);
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if(image != 0) {
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const int32_t* im = (const int32_t*)(image);
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const int8_t* base = (const int8_t*)(image);
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// the memory image begins with an index that gives the offsets into the
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// image for each of the fields in the BreakIteratorTables object--
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// use those to initialize the tables object (it will end up pointing
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// into the memory image for everything)
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numCategories = (int32_t)im[0];
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description = UnicodeString(TRUE, (UChar*)((int32_t)im[1] + base), -1);
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charCategoryTable = ucmp8_openAlias((uint16_t*)((int32_t)im[2] + base),
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(int8_t*)((int32_t)im[3] + base), 0);
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stateTable = (int16_t*)((int32_t)im[4] + base);
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backwardsStateTable = (int16_t*)((int32_t)im[5] + base);
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endStates = (int8_t*)((int32_t)im[6] + base);
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lookaheadStates = (int8_t*)((int32_t)im[7] + base);
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} else {
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udata_close(fMemory);
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}
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} else {
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fMemory = 0;
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}
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}
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RuleBasedBreakIteratorTables::RuleBasedBreakIteratorTables()
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: refCount(0),
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ownTables(TRUE),
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fMemory(0)
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{
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// everything else is null-initialized. This constructor depends on
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// a RuleBasedBreakIteratorBuilder filling in all the members
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}
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//=======================================================================
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// boilerplate
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//=======================================================================
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/**
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* Destructor
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*/
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RuleBasedBreakIteratorTables::~RuleBasedBreakIteratorTables() {
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if (ownTables) {
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delete [] stateTable;
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delete [] backwardsStateTable;
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delete [] endStates;
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delete [] lookaheadStates;
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ucmp8_close(charCategoryTable);
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}
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else {
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uprv_free(charCategoryTable);
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if(fMemory != 0) {
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udata_close(fMemory);
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}
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}
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}
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/**
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* Equality operator. Returns TRUE if both tables objects 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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RuleBasedBreakIteratorTables::operator==(const RuleBasedBreakIteratorTables& that) const {
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return this->description == that.description;
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}
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/**
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* Compute a hash code for these tables
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* @return A hash code
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*/
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int32_t
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RuleBasedBreakIteratorTables::hashCode() const {
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return description.hashCode();
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}
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//=======================================================================
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// implementation
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//=======================================================================
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/**
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* Looks up a character's category (i.e., its category for breaking purposes,
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* not its Unicode category)
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* The ignored parameter is used by derived implementations.
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*/
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int32_t
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RuleBasedBreakIteratorTables::lookupCategory(UChar c, BreakIterator* /*ignored*/) const {
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return ucmp8_get(charCategoryTable, c);
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}
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/**
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* Given a current state and a character category, looks up the
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* next state to transition to in the state table.
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*/
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int32_t
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RuleBasedBreakIteratorTables::lookupState(int32_t state, int32_t category) const {
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return stateTable[state * numCategories + category];
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}
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/**
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* Given a current state and a character category, looks up the
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* next state to transition to in the backwards state table.
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*/
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int32_t
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RuleBasedBreakIteratorTables::lookupBackwardState(int32_t state, int32_t category) const {
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return backwardsStateTable[state * numCategories + category];
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}
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/**
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* Returns true if the specified state is an accepting state.
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*/
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UBool
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RuleBasedBreakIteratorTables::isEndState(int32_t state) const {
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return endStates[state];
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}
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/**
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* Returns true if the specified state is a lookahead state.
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*/
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UBool
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RuleBasedBreakIteratorTables::isLookaheadState(int32_t state) const {
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return lookaheadStates[state];
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}
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U_NAMESPACE_END
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