Reland "Use upstream libaddressinput in Chrome."

third_party/libaddressinput/chromium/string_compare.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "third_party/libaddressinput/src/cpp/src/util/string_compare.h"
+
+#include "base/basictypes.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "third_party/icu/source/i18n/unicode/coll.h"
+
+namespace i18n {
+namespace addressinput {
+
+namespace {
+
+class IcuStringComparer {
+ public:
+  IcuStringComparer() {
+    UErrorCode error_code = U_ZERO_ERROR;
+    collator_.reset(
+        icu::Collator::createInstance(icu::Locale::getRoot(), error_code));
+    DCHECK(U_SUCCESS(error_code));
+    collator_->setStrength(icu::Collator::PRIMARY);
+  }
+
+  ~IcuStringComparer() {}
+
+  int Compare(const std::string& a, const std::string& b) const {
+    UErrorCode error_code = U_ZERO_ERROR;
+    int result = collator_->compareUTF8(a, b, error_code);
+    DCHECK(U_SUCCESS(error_code));
+    return result;
+  }
+
+ private:
+  // ::scoped_ptr is from "base/memory/scoped_ptr.h", which does not interfere
+  // with ::i18n::addressinput::scoped_ptr from
+  // <libaddressinput/util/scoped_ptr.h>.
+  ::scoped_ptr<icu::Collator> collator_;
+
+  DISALLOW_COPY_AND_ASSIGN(IcuStringComparer);
+};
+
+static base::LazyInstance<IcuStringComparer> g_comparer =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+// Dummy required for scoped_ptr<Impl>.
+class StringCompare::Impl {};
+
+StringCompare::StringCompare() {}
+
+StringCompare::~StringCompare() {}
+
+bool StringCompare::NaturalEquals(const std::string& a,
+                                  const std::string& b) const {
+  return g_comparer.Get().Compare(a, b) == 0;
+}
+
+bool StringCompare::NaturalLess(const std::string& a,
+                                const std::string& b) const {
+  return g_comparer.Get().Compare(a, b) < 0;
+}
+
+}  // namespace addressinput
+}  // namespace i18n