129 lines
4.1 KiB
C++
129 lines
4.1 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001-2002, 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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* 11/20/2001 aliu Creation.
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**********************************************************************
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*/
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#ifndef UNESCTRN_H
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#define UNESCTRN_H
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#include "unicode/translit.h"
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U_NAMESPACE_BEGIN
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/**
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* A transliterator that converts Unicode escape forms to the
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* characters they represent. Escape forms have a prefix, a suffix, a
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* radix, and minimum and maximum digit counts.
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*
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* <p>This class is package private. It registers several standard
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* variants with the system which are then accessed via their IDs.
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*
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* @author Alan Liu
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*/
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class U_I18N_API UnescapeTransliterator : public Transliterator {
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private:
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/**
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* The encoded pattern specification. The pattern consists of
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* zero or more forms. Each form consists of a prefix, suffix,
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* radix, minimum digit count, and maximum digit count. These
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* values are stored as a five character header. That is, their
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* numeric values are cast to 16-bit characters and stored in the
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* string. Following these five characters, the prefix
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* characters, then suffix characters are stored. Each form thus
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* takes n+5 characters, where n is the total length of the prefix
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* and suffix. The end is marked by a header of length one
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* consisting of the character END.
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*/
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UChar* spec; // owned; may not be NULL
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public:
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/**
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* Registers standard variants with the system. Called by
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* Transliterator during initialization.
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*/
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static void registerIDs();
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/**
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* Constructor. Takes the encoded spec array (does not adopt it).
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* @param ID the string identifier for this transliterator
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* @param spec the encoded spec array
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*/
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UnescapeTransliterator(const UnicodeString& ID,
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const UChar *spec);
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/**
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* Copy constructor.
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*/
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UnescapeTransliterator(const UnescapeTransliterator&);
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/**
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* Destructor.
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*/
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virtual ~UnescapeTransliterator();
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/**
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* Transliterator API.
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*/
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virtual Transliterator* clone() const;
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*
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* @draft ICU 2.2
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*/
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virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*
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* @draft ICU 2.2
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*/
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static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
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protected:
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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* @param text the buffer holding transliterated and
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* untransliterated text
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* @param offset the start and limit of the text, the position
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* of the cursor, and the start and limit of transliteration.
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* @param incremental if true, assume more text may be coming after
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* pos.contextLimit. Otherwise, assume the text is complete.
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*/
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void handleTransliterate(Replaceable& text, UTransPosition& offset,
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UBool isIncremental) const;
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private:
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/**
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* Factory methods
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*/
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static Transliterator* _createUnicode(const UnicodeString& ID, Token context);
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static Transliterator* _createJava(const UnicodeString& ID, Token context);
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static Transliterator* _createC(const UnicodeString& ID, Token context);
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static Transliterator* _createXML(const UnicodeString& ID, Token context);
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static Transliterator* _createXML10(const UnicodeString& ID, Token context);
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static Transliterator* _createPerl(const UnicodeString& ID, Token context);
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static Transliterator* _createAny(const UnicodeString& ID, Token context);
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static UChar* copySpec(const UChar* spec);
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/**
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* The address of this static class variable serves as this class's ID
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* for ICU "poor man's RTTI".
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*/
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static const char fgClassID;
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};
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U_NAMESPACE_END
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#endif
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