136 lines
4 KiB
C++
136 lines
4 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 1999-2010, International Business Machines Corporation and others.
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* 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 UNIFILT_H
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#define UNIFILT_H
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#include "unicode/utypes.h"
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#if U_SHOW_CPLUSPLUS_API
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#include "unicode/unifunct.h"
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#include "unicode/unimatch.h"
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/**
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* \file
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* \brief C++ API: Unicode Filter
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*/
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U_NAMESPACE_BEGIN
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/**
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* U_ETHER is used to represent character values for positions outside
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* a range. For example, transliterator uses this to represent
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* characters outside the range contextStart..contextLimit-1. This
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* allows explicit matching by rules and UnicodeSets of text outside a
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* defined range.
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* @stable ICU 3.0
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*/
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#define U_ETHER ((char16_t)0xFFFF)
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/**
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*
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* <code>UnicodeFilter</code> defines a protocol for selecting a
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* subset of the full range (U+0000 to U+10FFFF) of Unicode characters.
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* Currently, filters are used in conjunction with classes like
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* {@link Transliterator} to only process selected characters through a
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* transformation.
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*
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* <p>Note: UnicodeFilter currently stubs out two pure virtual methods
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* of its base class, UnicodeMatcher. These methods are toPattern()
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* and matchesIndexValue(). This is done so that filter classes that
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* are not actually used as matchers -- specifically, those in the
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* UnicodeFilterLogic component, and those in tests -- can continue to
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* work without defining these methods. As long as a filter is not
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* used in an RBT during real transliteration, these methods will not
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* be called. However, this breaks the UnicodeMatcher base class
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* protocol, and it is not a correct solution.
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*
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* <p>In the future we may revisit the UnicodeMatcher / UnicodeFilter
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* hierarchy and either redesign it, or simply remove the stubs in
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* UnicodeFilter and force subclasses to implement the full
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* UnicodeMatcher protocol.
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*
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* @see UnicodeFilterLogic
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* @stable ICU 2.0
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*/
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class U_COMMON_API UnicodeFilter : public UnicodeFunctor, public UnicodeMatcher {
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public:
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/**
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* Destructor
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* @stable ICU 2.0
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*/
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virtual ~UnicodeFilter();
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/**
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* Clones this object polymorphically.
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* The caller owns the result and should delete it when done.
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* @return clone, or nullptr if an error occurred
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* @stable ICU 2.4
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*/
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virtual UnicodeFilter* clone() const override = 0;
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/**
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* Returns <tt>true</tt> for characters that are in the selected
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* subset. In other words, if a character is <b>to be
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* filtered</b>, then <tt>contains()</tt> returns
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* <b><tt>false</tt></b>.
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* @stable ICU 2.0
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*/
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virtual UBool contains(UChar32 c) const = 0;
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/**
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* UnicodeFunctor API. Cast 'this' to a UnicodeMatcher* pointer
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* and return the pointer.
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* @stable ICU 2.4
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*/
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virtual UnicodeMatcher* toMatcher() const override;
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/**
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* Implement UnicodeMatcher API.
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* @stable ICU 2.4
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*/
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virtual UMatchDegree matches(const Replaceable& text,
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int32_t& offset,
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int32_t limit,
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UBool incremental) override;
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/**
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* UnicodeFunctor API. Nothing to do.
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* @stable ICU 2.4
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*/
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virtual void setData(const TransliterationRuleData*) override;
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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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* @stable ICU 2.2
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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protected:
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/*
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* Since this class has pure virtual functions,
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* a constructor can't be used.
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* @stable ICU 2.0
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*/
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/* UnicodeFilter();*/
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};
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/*inline UnicodeFilter::UnicodeFilter() {}*/
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U_NAMESPACE_END
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#endif /* U_SHOW_CPLUSPLUS_API */
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#endif
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