trait StringTransformTrait in Drupal 7 to 8/9 Module Upgrader 8

trait StringTransformTrait {

  /**
   * Converts a string toCamelCase :)
   *
   * @param string $string
   *   The string to convert.
   *
   * @return string
   */
  public function toCamelCase($string) {
    return preg_replace_callback('/_[a-z]/', function (array $match) {
      return strtoupper($match[0][1]);
    }, $string);
  }

  /**
   * Converts a string ToTitleCase.
   *
   * @param string $string
   *   The string to convert.
   *
   * @return string
   */
  public function toTitleCase($string) {
    $string = $this
      ->toCamelCase($string);
    $string[0] = strtoupper($string[0]);
    return $string;
  }

  /**
   * Trims a prefix (as well as leading or trailing underscore, if any) from a
   * string.
   *
   * @param string $string
   *   The string to process.
   * @param string $prefix
   *   The prefix to trim off, without leading or trailing underscores.
   *
   * @return string
   */
  public function unPrefix($string, $prefix) {
    return preg_replace('/^_?' . $prefix . '_/', NULL, $string);
  }

  /**
   * Trims a suffix (as well as leading underscore, if any) from a string.
   *
   * @param string $string
   *   The string to process.
   * @param string $suffix
   *   The suffix to trim off, without leading underscore.
   *
   * @return string
   */
  public function unSuffix($string, $suffix) {
    return preg_replace('/^_?' . $suffix . '$/', NULL, $string);
  }

  /**
   * Deletes {wildcards} from a route path.
   *
   * @param string $path
   *
   * @return string
   */
  public function deleteWildcards($path) {
    return preg_replace('/\\/?\\{([a-zA-Z0-9_]+)\\}/', NULL, $path);
  }

  /**
   * Deletes %wildcards from a route path.
   *
   * @param string $path
   *
   * @return string
   */
  public function deleteLegacyWildcards($path) {
    return preg_replace('/\\/?%[a-zA-Z0-9_]+/', NULL, $path);
  }

  /**
   * Generates an identifier from a Drupal 7 path.
   *
   * @param string $path
   *   The input path, including any %wildcards.
   *
   * @return string
   *   The identifier
   */
  public function getIdentifierFromLegacyPath($path) {
    return $this
      ->getIdentifierFromPath($this
      ->deleteLegacyWildcards($path));
  }

  /**
   * Generates an identifier from a path.
   *
   * @param string $path
   *   The input path, including any {wildcards}.
   *
   * @return string
   *   The identifier.
   */
  public function getIdentifierFromPath($path) {
    return $this
      ->getIdentifier($this
      ->deleteWildcards($path));
  }

  /**
   * Generates an identifier (prefixed with the module name, if $this->module exists)
   * from an arbitrary string.
   *
   * @param $string
   *   The input string.
   *
   * @return string
   *   The identifier.
   */
  public function getIdentifier($string) {

    // Replace all non-alphanumeric character sequences with an underscore.
    $id = preg_replace('/[^a-zA-Z0-9_]+/', '_', $string);
    if (isset($this->module)) {

      // If the name begins with MODULE_, replace that underscore with a period. Otherwise,
      // prefix the key with the module's machine name. We want all routes to look like
      // MODULE.route.
      if (stripos($id, $this->module
        ->getMachineName() . '_') === 0) {
        $id = preg_replace('/_/', '.', $id, 1);
      }
      else {
        $id = $this->module
          ->getMachineName() . '.' . $id;
      }
    }
    return $id;
  }

}