123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
/*
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* Copyright (C) {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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U_NAMESPACE_BEGIN
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class UnicodeString;
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class UnicodeMatcher;
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class Hashtable;
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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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// 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 (UnicodeMatcher).
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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 UnicodeMatcher 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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UnicodeMatcher** variables;
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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 UnicodeMatcher 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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/**
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* The character that represents segment 1. Characters segmentBase
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* through segmentBase - segmentCount + 1 represent segments 1
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* through segmentCount. Segments work down while variables work up.
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*/
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UChar segmentBase;
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int32_t segmentCount;
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public:
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TransliterationRuleData(UErrorCode& status);
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TransliterationRuleData(const TransliterationRuleData&);
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~TransliterationRuleData();
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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.
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*/
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const UnicodeMatcher* lookup(UChar32 standIn) const;
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/**
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* Return the zero-based index of the segment represented by the given
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* character, or -1 if none. Repeat: This is a zero-based return value,
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* 0..n-1, even though these are notated "$1".."$n", where n is segmentCount.
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*/
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int32_t lookupSegmentReference(UChar32 c) const;
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/**
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* Return the character used to stand for the given segment reference.
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* The reference must be in the range 1..segmentCount.
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*/
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UChar getSegmentStandin(int32_t ref) const {
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return (UChar)(segmentBase - ref + 1);
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}
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};
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U_NAMESPACE_END
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#endif
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