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152 lines
5 KiB
C++
152 lines
5 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999-2007, International Business Machines Corporation
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* 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 "unicode/utypes.h"
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#include "unicode/uclean.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/uobject.h"
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#include "rbt_set.h"
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#include "hash.h"
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U_NAMESPACE_BEGIN
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class UnicodeFunctor;
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class UnicodeMatcher;
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class UnicodeReplacer;
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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 : public UMemory {
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public:
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// PUBLIC DATA MEMBERS
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/**
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* Rule table. May be empty.
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*/
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TransliterationRuleSet ruleSet;
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/**
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* Map variable name (String) to variable (UnicodeString). A variable name
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* corresponds to zero or more characters, stored in a UnicodeString in
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* this hash. One or more of these chars may also correspond to a
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* UnicodeMatcher, in which case the character in the UnicodeString in this hash is
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* a stand-in: it is an index for a secondary lookup in
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* data.variables. The stand-in also represents the UnicodeMatcher in
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* the stored rules.
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*/
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Hashtable variableNames;
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/**
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* Map category variable (UChar) to set (UnicodeFunctor).
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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 UnicodeFunctor 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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* variables[i] represents character (variablesBase + i).
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*/
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UnicodeFunctor** variables;
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/**
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* Flag that indicates whether the variables are owned (if a single
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* call to Transliterator::createFromRules() produces a CompoundTransliterator
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* with more than one RuleBasedTransliterator as children, they all share
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* the same variables list, so only the first one is considered to own
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* the variables)
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*/
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UBool variablesAreOwned;
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/**
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* The character that represents variables[0]. Characters
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* variablesBase through variablesBase +
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* variablesLength - 1 represent UnicodeFunctor objects.
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*/
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UChar variablesBase;
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/**
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* The length of variables.
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*/
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int32_t variablesLength;
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public:
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/**
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* Constructor
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* @param status Output param set to success/failure code on exit.
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*/
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TransliterationRuleData(UErrorCode& status);
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/**
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* Copy Constructor
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*/
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TransliterationRuleData(const TransliterationRuleData&);
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/**
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* destructor
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*/
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~TransliterationRuleData();
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/**
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* Given a stand-in character, return the UnicodeFunctor that it
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* represents, or NULL if it doesn't represent anything.
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* @param standIn the given stand-in character.
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* @return the UnicodeFunctor that 'standIn' represents
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*/
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UnicodeFunctor* lookup(UChar32 standIn) const;
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/**
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* Given a stand-in character, return the UnicodeMatcher that it
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* represents, or NULL if it doesn't represent anything or if it
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* represents something that is not a matcher.
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* @param standIn the given stand-in character.
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* @return return the UnicodeMatcher that 'standIn' represents
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*/
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UnicodeMatcher* lookupMatcher(UChar32 standIn) const;
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/**
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* Given a stand-in character, return the UnicodeReplacer that it
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* represents, or NULL if it doesn't represent anything or if it
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* represents something that is not a replacer.
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* @param standIn the given stand-in character.
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* @return return the UnicodeReplacer that 'standIn' represents
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*/
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UnicodeReplacer* lookupReplacer(UChar32 standIn) const;
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private:
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TransliterationRuleData &operator=(const TransliterationRuleData &other); // forbid copying of this class
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_TRANSLITERATION */
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#endif
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