original_string: protected function normalization()
      {
          if (null === $this->normalization) {
              $this->normalization = new NormalizationBuilder($this);
          }
  
          return $this->normalization;
      }
code: protected function normalization()
      {
          if (null === $this->normalization) {
              $this->normalization = new NormalizationBuilder($this);
          }
  
          return $this->normalization;
      }
code_tokens: protected function normalization ( ) { if ( null === $ this -> normalization ) { $ this -> normalization = new NormalizationBuilder ( $ this ) ; } return $ this -> normalization ; }
docstring: Gets the builder for normalization rules.
  
  @return NormalizationBuilder
docstring_tokens: Gets the builder for normalization rules .