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