1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/icu/source/common/unifilt.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,69 @@
1.4 +/*
1.5 +**********************************************************************
1.6 +* Copyright (c) 2001-2012, International Business Machines
1.7 +* Corporation and others. All Rights Reserved.
1.8 +**********************************************************************
1.9 +* Date Name Description
1.10 +* 07/18/01 aliu Creation.
1.11 +**********************************************************************
1.12 +*/
1.13 +
1.14 +#include "unicode/unifilt.h"
1.15 +#include "unicode/rep.h"
1.16 +#include "unicode/utf16.h"
1.17 +
1.18 +U_NAMESPACE_BEGIN
1.19 +UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter)
1.20 +
1.21 +
1.22 +/* Define this here due to the lack of another file.
1.23 + It can't be defined in the header */
1.24 +UnicodeMatcher::~UnicodeMatcher() {}
1.25 +
1.26 +UnicodeFilter::~UnicodeFilter() {}
1.27 +
1.28 +/**
1.29 + * UnicodeFunctor API.
1.30 + * Note that UnicodeMatcher is a base class of UnicodeFilter.
1.31 + */
1.32 +UnicodeMatcher* UnicodeFilter::toMatcher() const {
1.33 + return const_cast<UnicodeFilter *>(this);
1.34 +}
1.35 +
1.36 +void UnicodeFilter::setData(const TransliterationRuleData*) {}
1.37 +
1.38 +/**
1.39 + * Default implementation of UnicodeMatcher::matches() for Unicode
1.40 + * filters. Matches a single code point at offset (either one or
1.41 + * two 16-bit code units).
1.42 + */
1.43 +UMatchDegree UnicodeFilter::matches(const Replaceable& text,
1.44 + int32_t& offset,
1.45 + int32_t limit,
1.46 + UBool incremental) {
1.47 + UChar32 c;
1.48 + if (offset < limit &&
1.49 + contains(c = text.char32At(offset))) {
1.50 + offset += U16_LENGTH(c);
1.51 + return U_MATCH;
1.52 + }
1.53 + if (offset > limit &&
1.54 + contains(c = text.char32At(offset))) {
1.55 + // Backup offset by 1, unless the preceding character is a
1.56 + // surrogate pair -- then backup by 2 (keep offset pointing at
1.57 + // the lead surrogate).
1.58 + --offset;
1.59 + if (offset >= 0) {
1.60 + offset -= U16_LENGTH(text.char32At(offset)) - 1;
1.61 + }
1.62 + return U_MATCH;
1.63 + }
1.64 + if (incremental && offset == limit) {
1.65 + return U_PARTIAL_MATCH;
1.66 + }
1.67 + return U_MISMATCH;
1.68 +}
1.69 +
1.70 +U_NAMESPACE_END
1.71 +
1.72 +//eof
