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* Copyright © {1999}, International Business Machines Corporation and others. All Rights Reserved.
* Date Name Description
* 11/17/99 aliu Creation.
#ifndef RBT_DATA_H
#define RBT_DATA_H
#include "rbt_set.h"
class UnicodeString;
class UnicodeSet;
struct UHashtable;
* The rule data for a RuleBasedTransliterators. RBT objects hold
* a const pointer to a TRD object that they do not own. TRD objects
* are essentially the parsed rules in compact, usable form. The
* TRD objects themselves are held for the life of the process in
* a static cache owned by Transliterator.
* This class' API is a little asymmetric. There is a method to
* define a variable, but no way to define a set. This is because the
* sets are defined by the parser in a UVector, and the vector is
* copied into a fixed-size array here. Once this is done, no new
* sets may be defined. In practice, there is no need to do so, since
* generating the data and using it are discrete phases. When there
* is a need to access the set data during the parse phase, another
* data structure handles this. See the parsing code for more
* details.
class TransliterationRuleData {
* Rule table. May be empty.
* PUBLIC DATA MEMBER for internal use by RBT
TransliterationRuleSet ruleSet;
* Map variable name (UnicodeString) to variable (Character).
* A variable name may correspond to a single literal
* character, in which case the character is stored in this
* hash. It may also correspond to a UnicodeSet, in which
* case a character is again stored in this hash, but the
* character is a stand-in: it is a key for a secondary lookup
* in data.setVariables. The stand-in also represents the
* UnicodeSet in the stored rules.
* PUBLIC DATA MEMBER for internal use by RBT
UHashtable* variableNames;
* Map category variable (Character) to set (UnicodeSet).
* Variables that correspond to a set of characters are mapped
* from variable name to a stand-in character in data.variableNames.
* The stand-in then serves as a key in this hash to lookup the
* actual UnicodeSet object. In addition, the stand-in is
* stored in the rule text to represent the set of characters.
* setVariables[i] represents character (setVariablesBase + i).
* PUBLIC DATA MEMBER for internal use by RBT
UnicodeSet** setVariables;
* The character represented by setVariables[0].
UChar setVariablesBase;
* The length of setVariables.
int32_t setVariablesLength;
TransliterationRuleData(UErrorCode& status);
void defineVariable(const UnicodeString& name,
UChar value,
UErrorCode& status);
UChar lookupVariable(const UnicodeString& name,
UErrorCode& status) const;
const UnicodeSet* lookupSet(UChar standIn) const;
bool_t isVariableDefined(const UnicodeString& name) const;