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+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// limitations under the License.
+
+#ifndef V8_EXTENSIONS_I18N_SRC_LOCALE_H_
+#define V8_EXTENSIONS_I18N_SRC_LOCALE_H_
+
+#include "unicode/uversion.h"
+#include "v8.h"
+
+namespace v8_i18n {
+
+// Canonicalizes the BCP47 language tag using BCP47 rules.
+// Returns 'invalid-tag' in case input was not well formed.
+void JSCanonicalizeLanguageTag(const v8::FunctionCallbackInfo<v8::Value>& args);
+
+// Returns a list of available locales for collator, date or number formatter.
+void JSAvailableLocalesOf(const v8::FunctionCallbackInfo<v8::Value>& args);
+
+// Returns default ICU locale.
+void JSGetDefaultICULocale(const v8::FunctionCallbackInfo<v8::Value>& args);
+
+// Returns an array of objects, that have maximized and base names of inputs.
+// Unicode extensions are dropped from both.
+// Input: ['zh-TW-u-nu-thai', 'sr']
+// Output: [{maximized: 'zh-Hant-TW', base: 'zh-TW'},
+//          {maximized: 'sr-Cyrl-RS', base: 'sr'}]
+void JSGetLanguageTagVariants(const v8::FunctionCallbackInfo<v8::Value>& args);
+
+}  // namespace v8_i18n
+
+#endif  // V8_EXTENSIONS_I18N_LOCALE_H_