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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;
class Hashtable;
* 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.
TransliterationRuleSet ruleSet;
* Map variable name (String) to variable (UnicodeString). A variable name
* corresponds to zero or more characters, stored in a UnicodeString in
* this hash. One or more of these chars may also correspond to a
* UnicodeSet, in which case the character in the UnicodeString in this hash is
* a stand-in: it is an index for a secondary lookup in
* data.setVariables. The stand-in also represents the UnicodeSet in
* the stored rules.
Hashtable* variableNames;
* Map category variable (UChar) 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).
UnicodeSet** setVariables;
* The character that represents setVariables[0]. Characters
* setVariablesBase through setVariablesBase +
* setVariables.length - 1 represent UnicodeSet objects.
UChar setVariablesBase;
* The length of setVariables.
int32_t setVariablesLength;
* The character that represents segment 1. Characters segmentBase
* through segmentBase + 8 represent segments 1 through 9.
UChar segmentBase;
TransliterationRuleData(UErrorCode& status);
TransliterationRuleData(const TransliterationRuleData&);
const UnicodeSet* lookupSet(UChar standIn) const;
* Return the zero-based index of the segment represented by the given
* character, or -1 if none. Repeat: This is a zero-based return value,
* 0..8, even though these are notated "$1".."$9".
int32_t lookupSegmentReference(UChar c) const;
* Return the character used to stand for the given segment reference.
* The reference must be in the range 1..9.
UChar getSegmentStandin(int32_t ref) const {
return (UChar)(segmentBase + ref - 1);