70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2000, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 02/04/00 aliu Creation.
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**********************************************************************
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*/
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#ifndef SYMTABLE_H
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#define SYMTABLE_H
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U_NAMESPACE_BEGIN
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class ParsePosition;
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class UnicodeSet;
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class UnicodeString;
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/**
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* An interface that maps strings to objects. This interface defines
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* both lookup protocol and parsing. This allows different components
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* to share a symbol table and to handle name parsing uniformly. It
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* is expected that client parse code look for the SYMBOL_REF
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* character and, when seen, attempt to parse the characters after it
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* using parseReference().
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*
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* <p>Currently, RuleBasedTransliterator and UnicodeSet use this
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* interface to share variable definitions.
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*/
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class SymbolTable {
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public:
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/**
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* The character preceding a symbol reference name.
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*/
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enum { SYMBOL_REF = 0x0024 /*$*/ };
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/**
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* Lookup the characters associated with this string and return it.
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* Return <tt>NULL</tt> if no such name exists. The resultant
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* string may have length zero.
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*/
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virtual const UnicodeString* lookup(const UnicodeString& s) const = 0;
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/**
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* Lookup the UnicodeSet associated with the given character, and
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* return it. Return <tt>null</tt> if not found.
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*/
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virtual const UnicodeSet* lookupSet(UChar32 ch) const = 0;
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/**
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* Parse a symbol reference name from the given string, starting
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* at the given position. If no valid symbol reference name is
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* found, return an empty string.
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* @param text the text to parse for the name
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* @param pos on entry, the index of the first character to parse.
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* This is the character following the SYMBOL_REF character. On
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* exit, the index after the last parsed character.
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* @param limit the index after the last character to be parsed.
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* @return the parsed name or an empty string.
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*/
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virtual UnicodeString parseReference(const UnicodeString& text,
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ParsePosition& pos, int32_t limit) const = 0;
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};
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U_NAMESPACE_END
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#endif
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