/src/icu/source/common/unifilt.cpp
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1 | | // © 2016 and later: Unicode, Inc. and others. |
2 | | // License & terms of use: http://www.unicode.org/copyright.html |
3 | | /* |
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 | | ********************************************************************** |
11 | | */ |
12 | | |
13 | | #include "unicode/unifilt.h" |
14 | | #include "unicode/rep.h" |
15 | | #include "unicode/utf16.h" |
16 | | |
17 | | U_NAMESPACE_BEGIN |
18 | | UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter) |
19 | | |
20 | | |
21 | | /* Define this here due to the lack of another file. |
22 | | It can't be defined in the header */ |
23 | 0 | UnicodeMatcher::~UnicodeMatcher() {} |
24 | | |
25 | 0 | UnicodeFilter::~UnicodeFilter() {} |
26 | | |
27 | | /** |
28 | | * UnicodeFunctor API. |
29 | | * Note that UnicodeMatcher is a base class of UnicodeFilter. |
30 | | */ |
31 | 0 | UnicodeMatcher* UnicodeFilter::toMatcher() const { |
32 | 0 | return const_cast<UnicodeFilter *>(this); |
33 | 0 | } |
34 | | |
35 | 0 | void UnicodeFilter::setData(const TransliterationRuleData*) {} |
36 | | |
37 | | /** |
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). |
41 | | */ |
42 | | UMatchDegree UnicodeFilter::matches(const Replaceable& text, |
43 | | int32_t& offset, |
44 | | int32_t limit, |
45 | 0 | UBool incremental) { |
46 | 0 | UChar32 c; |
47 | 0 | if (offset < limit && |
48 | 0 | contains(c = text.char32At(offset))) { |
49 | 0 | offset += U16_LENGTH(c); |
50 | 0 | return U_MATCH; |
51 | 0 | } |
52 | 0 | if (offset > limit && |
53 | 0 | 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). |
57 | 0 | --offset; |
58 | 0 | if (offset >= 0) { |
59 | 0 | offset -= U16_LENGTH(text.char32At(offset)) - 1; |
60 | 0 | } |
61 | 0 | return U_MATCH; |
62 | 0 | } |
63 | 0 | if (incremental && offset == limit) { |
64 | 0 | return U_PARTIAL_MATCH; |
65 | 0 | } |
66 | 0 | return U_MISMATCH; |
67 | 0 | } |
68 | | |
69 | | U_NAMESPACE_END |
70 | | |
71 | | //eof |