libs/androidfw/include/androidfw/Locale.h

/*
 * Copyright (C) 2015 The Android Open Source Project
 *
 * 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.
 */

#ifndef ANDROIDFW_LOCALE_VALUE_H
#define ANDROIDFW_LOCALE_VALUE_H

#include <string>
#include <vector>

#include "androidfw/ResourceTypes.h"
#include "androidfw/StringPiece.h"

namespace android {

/**
 * A convenience class to build and parse locales.
 */
struct LocaleValue {
  char language[4];
  char region[4];
  char script[4];
  char variant[8];

  inline LocaleValue();

  /**
   * Initialize this LocaleValue from a config string.
   */
  bool InitFromFilterString(android::StringPiece config);

  // Initializes this LocaleValue from a BCP-47 locale tag.
  bool InitFromBcp47Tag(android::StringPiece bcp47tag);

  /**
   * Initialize this LocaleValue from parts of a vector.
   */
  ssize_t InitFromParts(std::vector<std::string>::iterator iter,
                        std::vector<std::string>::iterator end);

  /**
   * Initialize this LocaleValue from a ResTable_config.
   */
  void InitFromResTable(const android::ResTable_config& config);

  /**
   * Set the locale in a ResTable_config from this LocaleValue.
   */
  void WriteTo(android::ResTable_config* out) const;

  inline int compare(const LocaleValue& other) const;

  inline bool operator<(const LocaleValue& o) const;
  inline bool operator<=(const LocaleValue& o) const;
  inline bool operator==(const LocaleValue& o) const;
  inline bool operator!=(const LocaleValue& o) const;
  inline bool operator>=(const LocaleValue& o) const;
  inline bool operator>(const LocaleValue& o) const;

 private:
  bool InitFromBcp47TagImpl(android::StringPiece bcp47tag, const char separator);

  void set_language(const char* language);
  void set_region(const char* language);
  void set_script(const char* script);
  void set_variant(const char* variant);
};

//
// Implementation
//

LocaleValue::LocaleValue() { memset(this, 0, sizeof(LocaleValue)); }

int LocaleValue::compare(const LocaleValue& other) const {
  return memcmp(this, &other, sizeof(LocaleValue));
}

bool LocaleValue::operator<(const LocaleValue& o) const {
  return compare(o) < 0;
}

bool LocaleValue::operator<=(const LocaleValue& o) const {
  return compare(o) <= 0;
}

bool LocaleValue::operator==(const LocaleValue& o) const {
  return compare(o) == 0;
}

bool LocaleValue::operator!=(const LocaleValue& o) const {
  return compare(o) != 0;
}

bool LocaleValue::operator>=(const LocaleValue& o) const {
  return compare(o) >= 0;
}

bool LocaleValue::operator>(const LocaleValue& o) const {
  return compare(o) > 0;
}

}  // namespace android

#endif  // ANDROIDFW_LOCALE_VALUE_H