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/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "third_party/icu/source/common/unicode/errorcode.h"
+#include "third_party/icu/source/common/unicode/locid.h"
+#include "third_party/icu/source/common/unicode/unistr.h"
+#include "third_party/icu/source/common/unicode/utypes.h"
+#include "third_party/icu/source/i18n/unicode/coll.h"
+
+namespace i18n {
+namespace addressinput {
+
+class StringCompare::Impl {
+ public:
+  Impl() {
+    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);
+  }
+
+  ~Impl() {}
+
+  bool NaturalEquals(const std::string& a, const std::string& b) const {
+    UErrorCode error_code = U_ZERO_ERROR;
+    bool equal = collator_->compareUTF8(a, b, error_code) == 0;
+    DCHECK(U_SUCCESS(error_code));
+    return equal;
+  }
+
+ 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(Impl);
+};
+
+StringCompare::StringCompare() : impl_(new Impl) {}
+
+StringCompare::~StringCompare() {}
+
+bool StringCompare::NaturalEquals(const std::string& a,
+                                  const std::string& b) const {
+  return impl_->NaturalEquals(a, b);
+}
+
+}  // namespace addressinput
+}  // namespace i18n