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<?php

namespace Drupal\language\Config;

/**
 * Provides a common trait for working with language override collection names.
 */
trait LanguageConfigCollectionNameTrait {

  /**
   * Creates a configuration collection name based on a language code.
   *
   * @param string $langcode
   *   The language code.
   *
   * @return string
   *   The configuration collection name for a language code.
   */
  protected function createConfigCollectionName($langcode) {
    return 'language.' . $langcode;
  }

  /**
   * Converts a configuration collection name to a language code.
   *
   * @param string $collection
   *   The configuration collection name.
   *
   * @return string
   *   The language code of the collection.
   *
   * @throws \InvalidArgumentException
   *   Exception thrown if the provided collection name is not in the format
   *   "language.LANGCODE".
   *
   * @see self::createConfigCollectionName()
   */
  protected function getLangcodeFromCollectionName($collection) {
    preg_match('/^language\.(.*)$/', $collection, $matches);
    if (!isset($matches[1])) {
      throw new \InvalidArgumentException("'$collection' is not a valid language override collection");
    }
    return $matches[1];
  }

}