60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
/*
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* Copyright (C) 2001, International Business Machines 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 "rbt_rule.h"
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U_NAMESPACE_BEGIN
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/**
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* Default implementation of UnicodeMatcher::matches() for Unicode
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* filters. Matches a single 16-bit code unit at offset.
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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) const {
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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 += UTF_CHAR_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 -= UTF_CHAR_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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// Stub this out for filters that do not implement a pattern
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UnicodeString& UnicodeFilter::toPattern(UnicodeString& result,
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UBool escapeUnprintable) const {
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return result;
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}
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// Stub this out for filters that do not implement indexing
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UBool UnicodeFilter::matchesIndexValue(uint8_t v) const {
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return FALSE;
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}
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U_NAMESPACE_END
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//eof
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