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File Name : symtable.h

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
*   Copyright (c) 2000-2005, International Business Machines
*   Corporation and others.  All Rights Reserved.
**********************************************************************
*   Date        Name        Description
*   02/04/00    aliu        Creation.
**********************************************************************
*/
#ifndef SYMTABLE_H
#define SYMTABLE_H

#include "unicode/utypes.h"
#include "unicode/uobject.h"

/**
 * \file 
 * \brief C++ API: An interface that defines both lookup protocol and parsing of
 * symbolic names.
 */
 
U_NAMESPACE_BEGIN

class ParsePosition;
class UnicodeFunctor;
class UnicodeSet;
class UnicodeString;

/**
 * An interface that defines both lookup protocol and parsing of
 * symbolic names.
 *
 * <p>A symbol table maintains two kinds of mappings.  The first is
 * between symbolic names and their values.  For example, if the
 * variable with the name "start" is set to the value "alpha"
 * (perhaps, though not necessarily, through an expression such as
 * "$start=alpha"), then the call lookup("start") will return the
 * char[] array ['a', 'l', 'p', 'h', 'a'].
 *
 * <p>The second kind of mapping is between character values and
 * UnicodeMatcher objects.  This is used by RuleBasedTransliterator,
 * which uses characters in the private use area to represent objects
 * such as UnicodeSets.  If U+E015 is mapped to the UnicodeSet [a-z],
 * then lookupMatcher(0xE015) will return the UnicodeSet [a-z].
 *
 * <p>Finally, a symbol table defines parsing behavior for symbolic
 * names.  All symbolic names start with the SYMBOL_REF character.
 * When a parser encounters this character, it calls parseReference()
 * with the position immediately following the SYMBOL_REF.  The symbol
 * table parses the name, if there is one, and returns it.
 *
 * @stable ICU 2.8
 */
class U_COMMON_API SymbolTable /* not : public UObject because this is an interface/mixin class */ {
public:

/**
     * The character preceding a symbol reference name.
     * @stable ICU 2.8
     */
    enum { SYMBOL_REF = 0x0024 /*$*/ };

/**
     * Destructor.
     * @stable ICU 2.8
     */
    virtual ~SymbolTable();

/**
     * Lookup the characters associated with this string and return it.
     * Return <tt>NULL</tt> if no such name exists.  The resultant
     * string may have length zero.
     * @param s the symbolic name to lookup
     * @return a string containing the name's value, or <tt>NULL</tt> if
     * there is no mapping for s.
     * @stable ICU 2.8
     */
    virtual const UnicodeString* lookup(const UnicodeString& s) const = 0;

/**
     * Lookup the UnicodeMatcher associated with the given character, and
     * return it.  Return <tt>NULL</tt> if not found.
     * @param ch a 32-bit code point from 0 to 0x10FFFF inclusive.
     * @return the UnicodeMatcher object represented by the given
     * character, or NULL if there is no mapping for ch.
     * @stable ICU 2.8
     */
    virtual const UnicodeFunctor* lookupMatcher(UChar32 ch) const = 0;

/**
     * Parse a symbol reference name from the given string, starting
     * at the given position.  If no valid symbol reference name is
     * found, return the empty string and leave pos unchanged.  That is, if the
     * character at pos cannot start a name, or if pos is at or after
     * text.length(), then return an empty string.  This indicates an
     * isolated SYMBOL_REF character.
     * @param text the text to parse for the name
     * @param pos on entry, the index of the first character to parse.
     * This is the character following the SYMBOL_REF character.  On
     * exit, the index after the last parsed character.  If the parse
     * failed, pos is unchanged on exit.
     * @param limit the index after the last character to be parsed.
     * @return the parsed name, or an empty string if there is no
     * valid symbolic name at the given position.
     * @stable ICU 2.8
     */
    virtual UnicodeString parseReference(const UnicodeString& text,
                                         ParsePosition& pos, int32_t limit) const = 0;
};
U_NAMESPACE_END

#endif

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-03 10:40:17
..	dir	-	root/root	0755	2024-03-03 10:40:17
alphaindex.h	text/x-c++	26.42 KB	root/root	0644	2019-11-07 06:58:02
appendable.h	text/x-c++	8.43 KB	root/root	0644	2019-11-07 06:58:02
basictz.h	text/x-c++	8.84 KB	root/root	0644	2019-11-07 06:58:02
brkiter.h	text/x-c++	27.64 KB	root/root	0644	2019-11-07 06:58:02
bytestream.h	text/x-c++	9.54 KB	root/root	0644	2019-11-07 06:58:02
bytestrie.h	text/x-c++	19.26 KB	root/root	0644	2019-11-07 06:58:02
bytestriebuilder.h	text/x-c++	7.02 KB	root/root	0644	2019-11-07 06:58:02
calendar.h	text/x-c++	105.06 KB	root/root	0644	2019-11-07 06:58:02
caniter.h	text/x-c++	7.37 KB	root/root	0644	2019-11-07 06:58:02
casemap.h	text/x-c++	25.26 KB	root/root	0644	2019-11-07 06:58:02
char16ptr.h	text/x-c++	7.16 KB	root/root	0644	2019-11-07 06:58:02
chariter.h	text/x-c++	24 KB	root/root	0644	2019-11-07 06:58:02
choicfmt.h	text/x-c++	23.85 KB	root/root	0644	2019-11-07 06:58:02
coleitr.h	text/x-c++	13.7 KB	root/root	0644	2019-11-07 06:58:02
coll.h	text/x-c++	55.59 KB	root/root	0644	2019-11-07 06:58:02
compactdecimalformat.h	text/x-c++	6.81 KB	root/root	0644	2019-11-07 06:58:02
curramt.h	text/x-c++	3.69 KB	root/root	0644	2019-11-07 06:58:02
currpinf.h	text/x-c++	7.24 KB	root/root	0644	2019-11-07 06:58:02
currunit.h	text/x-c++	3.99 KB	root/root	0644	2019-11-07 06:58:02
datefmt.h	text/x-c++	40.37 KB	root/root	0644	2019-11-07 06:58:02
dbbi.h	text/x-c	1.11 KB	root/root	0644	2019-11-07 06:58:02
dcfmtsym.h	text/x-c++	20.1 KB	root/root	0644	2019-11-07 06:58:02
decimfmt.h	text/x-c++	87.82 KB	root/root	0644	2019-11-07 06:58:02
docmain.h	text/x-tex	6.96 KB	root/root	0644	2019-11-07 06:58:02
dtfmtsym.h	text/x-c++	37.64 KB	root/root	0644	2019-11-07 06:58:02
dtintrv.h	text/x-c++	3.78 KB	root/root	0644	2019-11-07 06:58:02
dtitvfmt.h	text/x-c++	46.56 KB	root/root	0644	2019-11-07 06:58:02
dtitvinf.h	text/x-c++	18.46 KB	root/root	0644	2019-11-07 06:58:02
dtptngen.h	text/x-c++	25.08 KB	root/root	0644	2019-11-07 06:58:02
dtrule.h	text/x-c++	8.62 KB	root/root	0644	2019-11-07 06:58:02
edits.h	text/x-c++	20.67 KB	root/root	0644	2019-11-07 06:58:02
enumset.h	text/x-c++	2.08 KB	root/root	0644	2019-11-07 06:58:02
errorcode.h	text/x-c++	4.78 KB	root/root	0644	2019-11-07 06:58:02
fieldpos.h	text/x-c++	8.63 KB	root/root	0644	2019-11-07 06:58:02
filteredbrk.h	text/x-c++	5.24 KB	root/root	0644	2019-11-07 06:58:02
fmtable.h	text/x-c++	24.36 KB	root/root	0644	2019-11-07 06:58:02
format.h	text/x-c++	12.44 KB	root/root	0644	2019-11-07 06:58:02
formattedvalue.h	text/x-c++	9.73 KB	root/root	0644	2019-11-07 06:58:02
fpositer.h	text/x-c++	2.98 KB	root/root	0644	2019-11-07 06:58:02
gender.h	text/x-c++	3.27 KB	root/root	0644	2019-11-07 06:58:02

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