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142 lines
4.2 KiB
C++
142 lines
4.2 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001-2007, 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 ESCTRN_H
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#define ESCTRN_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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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 characters to an escape
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* form. Examples of escape forms are "U+4E01" and "".
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* Escape forms have a prefix and suffix, either of which may be
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* empty, a radix, typically 16 or 10, a minimum digit count,
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* typically 1, 4, or 8, and a boolean that specifies whether
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* supplemental characters are handled as 32-bit code points or as two
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* 16-bit code units. Most escape forms handle 32-bit code points,
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* but some, such as the Java form, intentionally break them into two
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* surrogate pairs, for backward compatibility.
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*
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* <p>Some escape forms actually have two different patterns, one for
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* BMP characters (0..FFFF) and one for supplements (>FFFF). To
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* handle this, a second EscapeTransliterator may be defined that
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* specifies the pattern to be produced for supplementals. An example
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* of a form that requires this is the C form, which uses "\\uFFFF"
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* for BMP characters and "\\U0010FFFF" for supplementals.
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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 EscapeTransliterator : public Transliterator {
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private:
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/**
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* The prefix of the escape form; may be empty, but usually isn't.
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*/
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UnicodeString prefix;
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/**
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* The prefix of the escape form; often empty.
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*/
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UnicodeString suffix;
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/**
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* The radix to display the number in. Typically 16 or 10. Must
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* be in the range 2 to 36.
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*/
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int32_t radix;
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/**
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* The minimum number of digits. Typically 1, 4, or 8. Values
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* less than 1 are equivalent to 1.
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*/
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int32_t minDigits;
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/**
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* If true, supplementals are handled as 32-bit code points. If
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* false, they are handled as two 16-bit code units.
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*/
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UBool grokSupplementals;
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/**
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* The form to be used for supplementals. If this is null then
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* the same form is used for BMP characters and supplementals. If
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* this is not null and if grokSupplementals is true then the
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* prefix, suffix, radix, and minDigits of this object are used
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* for supplementals. This pointer is owned.
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*/
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EscapeTransliterator* supplementalHandler;
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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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* Constructs an escape transliterator with the given ID and
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* parameters. See the class member documentation for details.
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*/
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EscapeTransliterator(const UnicodeString& ID,
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const UnicodeString& prefix, const UnicodeString& suffix,
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int32_t radix, int32_t minDigits,
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UBool grokSupplementals,
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EscapeTransliterator* adoptedSupplementalHandler);
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/**
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* Copy constructor.
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*/
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EscapeTransliterator(const EscapeTransliterator&);
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/**
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* Destructor.
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*/
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virtual ~EscapeTransliterator();
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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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virtual UClassID getDynamicClassID() const;
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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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U_I18N_API static UClassID U_EXPORT2 getStaticClassID();
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protected:
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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*/
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virtual void handleTransliterate(Replaceable& text, UTransPosition& offset,
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UBool isIncremental) const;
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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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