| /* |
| ********************************************************************** |
| * Copyright (c) 2001-2012, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ********************************************************************** |
| * Date Name Description |
| * 07/18/01 aliu Creation. |
| ********************************************************************** |
| */ |
| |
| #include "unicode/unifilt.h" |
| #include "unicode/rep.h" |
| #include "unicode/utf16.h" |
| |
| U_NAMESPACE_BEGIN |
| UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter) |
| |
| |
| /* Define this here due to the lack of another file. |
| It can't be defined in the header */ |
| UnicodeMatcher::~UnicodeMatcher() {} |
| |
| UnicodeFilter::~UnicodeFilter() {} |
| |
| /** |
| * UnicodeFunctor API. |
| * Note that UnicodeMatcher is a base class of UnicodeFilter. |
| */ |
| UnicodeMatcher* UnicodeFilter::toMatcher() const { |
| return const_cast<UnicodeFilter *>(this); |
| } |
| |
| void UnicodeFilter::setData(const TransliterationRuleData*) {} |
| |
| /** |
| * Default implementation of UnicodeMatcher::matches() for Unicode |
| * filters. Matches a single code point at offset (either one or |
| * two 16-bit code units). |
| */ |
| UMatchDegree UnicodeFilter::matches(const Replaceable& text, |
| int32_t& offset, |
| int32_t limit, |
| UBool incremental) { |
| UChar32 c; |
| if (offset < limit && |
| contains(c = text.char32At(offset))) { |
| offset += U16_LENGTH(c); |
| return U_MATCH; |
| } |
| if (offset > limit && |
| contains(c = text.char32At(offset))) { |
| // Backup offset by 1, unless the preceding character is a |
| // surrogate pair -- then backup by 2 (keep offset pointing at |
| // the lead surrogate). |
| --offset; |
| if (offset >= 0) { |
| offset -= U16_LENGTH(text.char32At(offset)) - 1; |
| } |
| return U_MATCH; |
| } |
| if (incremental && offset == limit) { |
| return U_PARTIAL_MATCH; |
| } |
| return U_MISMATCH; |
| } |
| |
| U_NAMESPACE_END |
| |
| //eof |
