wtf/unicode/CollatorDefault.cpp

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "config.h"
  30 #include "Collator.h"
  31
  32 #if !USE(ICU_UNICODE) || UCONFIG_NO_COLLATION
  33
  34 namespace WTF {
  35
  36 Collator::Collator(const char*)
  37 {
  38 }
  39
  40 Collator::~Collator()
  41 {
  42 }
  43
  44 void Collator::setOrderLowerFirst(bool)
  45 {
  46 }
  47
  48 PassOwnPtr<Collator> Collator::userDefault()
  49 {
  50     return new Collator(0);
  51 }
  52
  53 // A default implementation for platforms that lack Unicode-aware collation.
  54 Collator::Result Collator::collate(const UChar* lhs, size_t lhsLength, const UChar* rhs, size_t rhsLength) const
  55 {
  56     int lmin = lhsLength < rhsLength ? lhsLength : rhsLength;
  57     int l = 0;
  58     while (l < lmin && *lhs == *rhs) {
  59         lhs++;
  60         rhs++;
  61         l++;
  62     }
  63
  64     if (l < lmin)
  65         return (*lhs > *rhs) ? Greater : Less;
  66
  67     if (lhsLength == rhsLength)
  68         return Equal;
  69
  70     return (lhsLength > rhsLength) ? Greater : Less;
  71 }
  72
  73 }
  74
  75 #endif