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   1  <?php
   2  
   3  /*
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2019 The s9e Authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\Validators;
   9  use InvalidArgumentException;
  10  abstract class TemplateParameterName
  11  {
  12  	public static function isValid($name)
  13      {
  14          return (bool) \preg_match('#^[a-z_][-a-z_0-9]*$#Di', $name);
  15      }
  16  	public static function normalize($name)
  17      {
  18          $name = (string) $name;
  19          if (!static::isValid($name))
  20              throw new InvalidArgumentException("Invalid parameter name '" . $name . "'");
  21          return $name;
  22      }
  23  }