The Tor Browser: intl/icu/source/common/unifilt.cpp@fc2d59ddac77

     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 */

    11 #include "unicode/unifilt.h"

    12 #include "unicode/rep.h"

    13 #include "unicode/utf16.h"

    15 U_NAMESPACE_BEGIN

    16 UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(UnicodeFilter)

    19 /* Define this here due to the lack of another file.

    20    It can't be defined in the header */

    21 UnicodeMatcher::~UnicodeMatcher() {}

    23 UnicodeFilter::~UnicodeFilter() {}

    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 }

    33 void UnicodeFilter::setData(const TransliterationRuleData*) {}

    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 }

    67 U_NAMESPACE_END

    69 //eof

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