137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
|
|
// License & terms of use: http://www.unicode.org/copyright.html
|
|
/*
|
|
**********************************************************************
|
|
* Copyright (C) 1999-2010, International Business Machines Corporation and others.
|
|
* All Rights Reserved.
|
|
**********************************************************************
|
|
* Date Name Description
|
|
* 11/17/99 aliu Creation.
|
|
**********************************************************************
|
|
*/
|
|
#ifndef UNIFILT_H
|
|
#define UNIFILT_H
|
|
|
|
#include "unicode/utypes.h"
|
|
|
|
#if U_SHOW_CPLUSPLUS_API
|
|
|
|
#include "unicode/unifunct.h"
|
|
#include "unicode/unimatch.h"
|
|
|
|
/**
|
|
* \file
|
|
* \brief C++ API: Unicode Filter
|
|
*/
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
/**
|
|
* U_ETHER is used to represent character values for positions outside
|
|
* a range. For example, transliterator uses this to represent
|
|
* characters outside the range contextStart..contextLimit-1. This
|
|
* allows explicit matching by rules and UnicodeSets of text outside a
|
|
* defined range.
|
|
* @stable ICU 3.0
|
|
*/
|
|
#define U_ETHER ((char16_t)0xFFFF)
|
|
|
|
/**
|
|
*
|
|
* <code>UnicodeFilter</code> defines a protocol for selecting a
|
|
* subset of the full range (U+0000 to U+10FFFF) of Unicode characters.
|
|
* Currently, filters are used in conjunction with classes like
|
|
* {@link Transliterator} to only process selected characters through a
|
|
* transformation.
|
|
*
|
|
* <p>Note: UnicodeFilter currently stubs out two pure virtual methods
|
|
* of its base class, UnicodeMatcher. These methods are toPattern()
|
|
* and matchesIndexValue(). This is done so that filter classes that
|
|
* are not actually used as matchers -- specifically, those in the
|
|
* UnicodeFilterLogic component, and those in tests -- can continue to
|
|
* work without defining these methods. As long as a filter is not
|
|
* used in an RBT during real transliteration, these methods will not
|
|
* be called. However, this breaks the UnicodeMatcher base class
|
|
* protocol, and it is not a correct solution.
|
|
*
|
|
* <p>In the future we may revisit the UnicodeMatcher / UnicodeFilter
|
|
* hierarchy and either redesign it, or simply remove the stubs in
|
|
* UnicodeFilter and force subclasses to implement the full
|
|
* UnicodeMatcher protocol.
|
|
*
|
|
* @see UnicodeFilterLogic
|
|
* @stable ICU 2.0
|
|
*/
|
|
class U_COMMON_API UnicodeFilter : public UnicodeFunctor, public UnicodeMatcher {
|
|
|
|
public:
|
|
/**
|
|
* Destructor
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual ~UnicodeFilter();
|
|
|
|
/**
|
|
* Clones this object polymorphically.
|
|
* The caller owns the result and should delete it when done.
|
|
* @return clone, or nullptr if an error occurred
|
|
* @stable ICU 2.4
|
|
*/
|
|
virtual UnicodeFilter* clone() const = 0;
|
|
|
|
/**
|
|
* Returns <tt>true</tt> for characters that are in the selected
|
|
* subset. In other words, if a character is <b>to be
|
|
* filtered</b>, then <tt>contains()</tt> returns
|
|
* <b><tt>false</tt></b>.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual UBool contains(UChar32 c) const = 0;
|
|
|
|
/**
|
|
* UnicodeFunctor API. Cast 'this' to a UnicodeMatcher* pointer
|
|
* and return the pointer.
|
|
* @stable ICU 2.4
|
|
*/
|
|
virtual UnicodeMatcher* toMatcher() const;
|
|
|
|
/**
|
|
* Implement UnicodeMatcher API.
|
|
* @stable ICU 2.4
|
|
*/
|
|
virtual UMatchDegree matches(const Replaceable& text,
|
|
int32_t& offset,
|
|
int32_t limit,
|
|
UBool incremental);
|
|
|
|
/**
|
|
* UnicodeFunctor API. Nothing to do.
|
|
* @stable ICU 2.4
|
|
*/
|
|
virtual void setData(const TransliterationRuleData*);
|
|
|
|
/**
|
|
* ICU "poor man's RTTI", returns a UClassID for this class.
|
|
*
|
|
* @stable ICU 2.2
|
|
*/
|
|
static UClassID U_EXPORT2 getStaticClassID();
|
|
|
|
protected:
|
|
|
|
/*
|
|
* Since this class has pure virtual functions,
|
|
* a constructor can't be used.
|
|
* @stable ICU 2.0
|
|
*/
|
|
/* UnicodeFilter();*/
|
|
};
|
|
|
|
/*inline UnicodeFilter::UnicodeFilter() {}*/
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* U_SHOW_CPLUSPLUS_API */
|
|
|
|
#endif
|