projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| f3c0d7a5 A |
1 | // © 2016 and later: Unicode, Inc. and others. |
| 2 | // License & terms of use: http://www.unicode.org/copyright.html | |
| b75a7d8f | 3 | /* |
| 374ca955 | 4 | ********************************************************************** |
| 51004dcb | 5 | * Copyright (c) 2001-2012, International Business Machines |
| 374ca955 | 6 | * Corporation and others. All Rights Reserved. |
| b75a7d8f A |
7 | ********************************************************************** |
| 8 | * Date Name Description | |
| 9 | * 07/18/01 aliu Creation. | |
| 10 | ********************************************************************** | |
| 11 | */ | |
| 12 | ||
| 13 | #include "unicode/unifilt.h" | |
| 14 | #include "unicode/rep.h" | |
| 4388f060 | 15 | #include "unicode/utf16.h" |
| b75a7d8f A |
16 | |
| 17 | U_NAMESPACE_BEGIN | |
| 374ca955 A |
18 | UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter) |
| 19 | ||
| b75a7d8f | 20 | |
| 374ca955 A |
21 | /* Define this here due to the lack of another file. |
| 22 | It can't be defined in the header */ | |
| 23 | UnicodeMatcher::~UnicodeMatcher() {} | |
| 24 | ||
| 25 | UnicodeFilter::~UnicodeFilter() {} | |
| b75a7d8f A |
26 | |
| 27 | /** | |
| 51004dcb A |
28 | * UnicodeFunctor API. |
| 29 | * Note that UnicodeMatcher is a base class of UnicodeFilter. | |
| b75a7d8f A |
30 | */ |
| 31 | UnicodeMatcher* UnicodeFilter::toMatcher() const { | |
| 51004dcb | 32 | return const_cast<UnicodeFilter *>(this); |
| b75a7d8f A |
33 | } |
| 34 | ||
| 374ca955 A |
35 | void UnicodeFilter::setData(const TransliterationRuleData*) {} |
| 36 | ||
| b75a7d8f A |
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 | UBool incremental) { | |
| 46 | UChar32 c; | |
| 47 | if (offset < limit && | |
| 48 | contains(c = text.char32At(offset))) { | |
| 4388f060 | 49 | offset += U16_LENGTH(c); |
| b75a7d8f A |
50 | return U_MATCH; |
| 51 | } | |
| 52 | if (offset > limit && | |
| 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). | |
| 57 | --offset; | |
| 58 | if (offset >= 0) { | |
| 4388f060 | 59 | offset -= U16_LENGTH(text.char32At(offset)) - 1; |
| b75a7d8f A |
60 | } |
| 61 | return U_MATCH; | |
| 62 | } | |
| 63 | if (incremental && offset == limit) { | |
| 64 | return U_PARTIAL_MATCH; | |
| 65 | } | |
| 66 | return U_MISMATCH; | |
| 67 | } | |
| 68 | ||
| 69 | U_NAMESPACE_END | |
| 70 | ||
| 71 | //eof |