70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001-2012, 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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* 07/18/01 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/unifilt.h"
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#include "unicode/rep.h"
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#include "unicode/utf16.h"
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter)
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/* Define this here due to the lack of another file.
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It can't be defined in the header */
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UnicodeMatcher::~UnicodeMatcher() {}
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UnicodeFilter::~UnicodeFilter() {}
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/**
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* UnicodeFunctor API.
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* Note that UnicodeMatcher is a base class of UnicodeFilter.
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*/
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UnicodeMatcher* UnicodeFilter::toMatcher() const {
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return const_cast<UnicodeFilter *>(this);
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}
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void UnicodeFilter::setData(const TransliterationRuleData*) {}
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/**
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* Default implementation of UnicodeMatcher::matches() for Unicode
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* filters. Matches a single code point at offset (either one or
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* two 16-bit code units).
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*/
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UMatchDegree UnicodeFilter::matches(const Replaceable& text,
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int32_t& offset,
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int32_t limit,
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UBool incremental) {
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UChar32 c;
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if (offset < limit &&
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contains(c = text.char32At(offset))) {
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offset += U16_LENGTH(c);
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return U_MATCH;
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}
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if (offset > limit &&
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contains(c = text.char32At(offset))) {
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// Backup offset by 1, unless the preceding character is a
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// surrogate pair -- then backup by 2 (keep offset pointing at
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// the lead surrogate).
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--offset;
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if (offset >= 0) {
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offset -= U16_LENGTH(text.char32At(offset)) - 1;
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}
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return U_MATCH;
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}
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if (incremental && offset == limit) {
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return U_PARTIAL_MATCH;
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}
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return U_MISMATCH;
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}
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U_NAMESPACE_END
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//eof
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