1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 **********************************************************************
5 * Copyright (c) 2001-2012, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 **********************************************************************
8 * Date Name Description
9 * 07/18/01 aliu Creation.
10 **********************************************************************
13 #include "unicode/unifilt.h"
14 #include "unicode/rep.h"
15 #include "unicode/utf16.h"
18 UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter)
21 /* Define this here due to the lack of another file.
22 It can't be defined in the header */
23 UnicodeMatcher::~UnicodeMatcher() {}
25 UnicodeFilter::~UnicodeFilter() {}
29 * Note that UnicodeMatcher is a base class of UnicodeFilter.
31 UnicodeMatcher* UnicodeFilter::toMatcher() const {
32 return const_cast<UnicodeFilter *>(this);
35 void UnicodeFilter::setData(const TransliterationRuleData*) {}
38 * Default implementation of UnicodeMatcher::matches() for Unicode
39 * filters. Matches a single code point at offset (either one or
40 * two 16-bit code units).
42 UMatchDegree UnicodeFilter::matches(const Replaceable& text,
48 contains(c = text.char32At(offset))) {
49 offset += U16_LENGTH(c);
53 contains(c = text.char32At(offset))) {
54 // Backup offset by 1, unless the preceding character is a
55 // surrogate pair -- then backup by 2 (keep offset pointing at
56 // the lead surrogate).
59 offset -= U16_LENGTH(text.char32At(offset)) - 1;
63 if (incremental && offset == limit) {
64 return U_PARTIAL_MATCH;