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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "third_party/libaddressinput/src/cpp/src/util/string_compare.h"
      6 
      7 #include "base/basictypes.h"
      8 #include "base/lazy_instance.h"
      9 #include "base/logging.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "third_party/icu/source/i18n/unicode/coll.h"
     12 
     13 namespace i18n {
     14 namespace addressinput {
     15 
     16 namespace {
     17 
     18 class IcuStringComparer {
     19  public:
     20   IcuStringComparer() {
     21     UErrorCode error_code = U_ZERO_ERROR;
     22     collator_.reset(
     23         icu::Collator::createInstance(icu::Locale::getRoot(), error_code));
     24     DCHECK(U_SUCCESS(error_code));
     25     collator_->setStrength(icu::Collator::PRIMARY);
     26   }
     27 
     28   ~IcuStringComparer() {}
     29 
     30   int Compare(const std::string& a, const std::string& b) const {
     31     UErrorCode error_code = U_ZERO_ERROR;
     32     int result = collator_->compareUTF8(a, b, error_code);
     33     DCHECK(U_SUCCESS(error_code));
     34     return result;
     35   }
     36 
     37  private:
     38   // ::scoped_ptr is from "base/memory/scoped_ptr.h", which does not interfere
     39   // with ::i18n::addressinput::scoped_ptr from
     40   // <libaddressinput/util/scoped_ptr.h>.
     41   ::scoped_ptr<icu::Collator> collator_;
     42 
     43   DISALLOW_COPY_AND_ASSIGN(IcuStringComparer);
     44 };
     45 
     46 static base::LazyInstance<IcuStringComparer> g_comparer =
     47     LAZY_INSTANCE_INITIALIZER;
     48 
     49 }  // namespace
     50 
     51 // Dummy required for scoped_ptr<Impl>.
     52 class StringCompare::Impl {};
     53 
     54 StringCompare::StringCompare() {}
     55 
     56 StringCompare::~StringCompare() {}
     57 
     58 bool StringCompare::NaturalEquals(const std::string& a,
     59                                   const std::string& b) const {
     60   return g_comparer.Get().Compare(a, b) == 0;
     61 }
     62 
     63 bool StringCompare::NaturalLess(const std::string& a,
     64                                 const std::string& b) const {
     65   return g_comparer.Get().Compare(a, b) < 0;
     66 }
     67 
     68 }  // namespace addressinput
     69 }  // namespace i18n
     70