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comparison: intl/icu/source/common/unifilt.cpp
intl/icu/source/common/unifilt.cpp
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- 6474c204b198
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| -1:000000000000 | 0:5ceb7945e03a |
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| 1 /* | |
| 2 ********************************************************************** | |
| 3 * Copyright (c) 2001-2012, International Business Machines | |
| 4 * Corporation and others. All Rights Reserved. | |
| 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 #include "unicode/utf16.h" | |
| 14 | |
| 15 U_NAMESPACE_BEGIN | |
| 16 UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter) | |
| 17 | |
| 18 | |
| 19 /* Define this here due to the lack of another file. | |
| 20 It can't be defined in the header */ | |
| 21 UnicodeMatcher::~UnicodeMatcher() {} | |
| 22 | |
| 23 UnicodeFilter::~UnicodeFilter() {} | |
| 24 | |
| 25 /** | |
| 26 * UnicodeFunctor API. | |
| 27 * Note that UnicodeMatcher is a base class of UnicodeFilter. | |
| 28 */ | |
| 29 UnicodeMatcher* UnicodeFilter::toMatcher() const { | |
| 30 return const_cast<UnicodeFilter *>(this); | |
| 31 } | |
| 32 | |
| 33 void UnicodeFilter::setData(const TransliterationRuleData*) {} | |
| 34 | |
| 35 /** | |
| 36 * Default implementation of UnicodeMatcher::matches() for Unicode | |
| 37 * filters. Matches a single code point at offset (either one or | |
| 38 * two 16-bit code units). | |
| 39 */ | |
| 40 UMatchDegree UnicodeFilter::matches(const Replaceable& text, | |
| 41 int32_t& offset, | |
| 42 int32_t limit, | |
| 43 UBool incremental) { | |
| 44 UChar32 c; | |
| 45 if (offset < limit && | |
| 46 contains(c = text.char32At(offset))) { | |
| 47 offset += U16_LENGTH(c); | |
| 48 return U_MATCH; | |
| 49 } | |
| 50 if (offset > limit && | |
| 51 contains(c = text.char32At(offset))) { | |
| 52 // Backup offset by 1, unless the preceding character is a | |
| 53 // surrogate pair -- then backup by 2 (keep offset pointing at | |
| 54 // the lead surrogate). | |
| 55 --offset; | |
| 56 if (offset >= 0) { | |
| 57 offset -= U16_LENGTH(text.char32At(offset)) - 1; | |
| 58 } | |
| 59 return U_MATCH; | |
| 60 } | |
| 61 if (incremental && offset == limit) { | |
| 62 return U_PARTIAL_MATCH; | |
| 63 } | |
| 64 return U_MISMATCH; | |
| 65 } | |
| 66 | |
| 67 U_NAMESPACE_END | |
| 68 | |
| 69 //eof |
