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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2009 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Locale utilities.
 *
 * Class duplicated from the i18n.LocaleUtil class.
 *
 * @author [email protected] (Anatol Pomazau)
 */
class LocaleUtil {
  private static final Pattern LOCALE_PATTERN =
      Pattern.compile("(^[^_-]*)(?:[_-]([^_-]*)(?:[_-]([^_-]*))?)?");

  /**
   * Convert a locale string from the RFC 3066 standard format
   * to the Java locale format. You can call this on
   * any locale string obtained from an external source
   * (cookie, URL parameter, header, etc.). This method accepts
   * more than just the standard format and will also tolerate
   * capitalization discrepancies and the use of an underscore
   * in place of a hyphen.
   *
   * @param s String representation for locale.
   * @return Parsed locale.
   */
  static Locale getLocaleFromStandardLocaleString(String s) {
    if (s == null) {
      return null;
    }

    Matcher matcher = LOCALE_PATTERN.matcher(s);

    // LOCALE_PATTERN will match any string, though it may not match the whole
    // string.  Specifically, it will not match a third _ or - or any
    // subsequent text.
    matcher.find();

    String language = Strings.makeSafe(matcher.group(1));
    String country = Strings.makeSafe(matcher.group(2));
    String variant = Strings.makeSafe(matcher.group(3));

    return new Locale(language, country, variant);
  }
}