projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| b75a7d8f | 1 | /* |
| 374ca955 A |
2 | ********************************************************************** |
| 3 | * Copyright (c) 2001-2004, International Business Machines | |
| 4 | * Corporation and others. All Rights Reserved. | |
| b75a7d8f A |
5 | ********************************************************************** |
| 6 | * Date Name Description | |
| 7 | * 07/18/01 aliu Creation. | |
| 8 | ********************************************************************** | |
| 9 | */ | |
| 10 | ||
| 11 | #include "unicode/unifilt.h" | |
| 12 | #include "unicode/rep.h" | |
| 13 | ||
| 14 | U_NAMESPACE_BEGIN | |
| 374ca955 A |
15 | UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter) |
| 16 | ||
| b75a7d8f | 17 | |
| 374ca955 A |
18 | /* Define this here due to the lack of another file. |
| 19 | It can't be defined in the header */ | |
| 20 | UnicodeMatcher::~UnicodeMatcher() {} | |
| 21 | ||
| 22 | UnicodeFilter::~UnicodeFilter() {} | |
| b75a7d8f A |
23 | |
| 24 | /** | |
| 25 | * UnicodeFunctor API. Cast 'this' to a UnicodeMatcher* pointer | |
| 26 | * and return the pointer. | |
| 27 | */ | |
| 28 | UnicodeMatcher* UnicodeFilter::toMatcher() const { | |
| 29 | return (UnicodeMatcher*) this; | |
| 30 | } | |
| 31 | ||
| 374ca955 A |
32 | void UnicodeFilter::setData(const TransliterationRuleData*) {} |
| 33 | ||
| b75a7d8f A |
34 | /** |
| 35 | * Default implementation of UnicodeMatcher::matches() for Unicode | |
| 36 | * filters. Matches a single code point at offset (either one or | |
| 37 | * two 16-bit code units). | |
| 38 | */ | |
| 39 | UMatchDegree UnicodeFilter::matches(const Replaceable& text, | |
| 40 | int32_t& offset, | |
| 41 | int32_t limit, | |
| 42 | UBool incremental) { | |
| 43 | UChar32 c; | |
| 44 | if (offset < limit && | |
| 45 | contains(c = text.char32At(offset))) { | |
| 46 | offset += UTF_CHAR_LENGTH(c); | |
| 47 | return U_MATCH; | |
| 48 | } | |
| 49 | if (offset > limit && | |
| 50 | contains(c = text.char32At(offset))) { | |
| 51 | // Backup offset by 1, unless the preceding character is a | |
| 52 | // surrogate pair -- then backup by 2 (keep offset pointing at | |
| 53 | // the lead surrogate). | |
| 54 | --offset; | |
| 55 | if (offset >= 0) { | |
| 56 | offset -= UTF_CHAR_LENGTH(text.char32At(offset)) - 1; | |
| 57 | } | |
| 58 | return U_MATCH; | |
| 59 | } | |
| 60 | if (incremental && offset == limit) { | |
| 61 | return U_PARTIAL_MATCH; | |
| 62 | } | |
| 63 | return U_MISMATCH; | |
| 64 | } | |
| 65 | ||
| 66 | U_NAMESPACE_END | |
| 67 | ||
| 68 | //eof |