original_string: public function getAliases($extension = null)
      {
          if ($extension === null) {
              return $this->aliases;
          }
          elseif (isset($this->aliases[$extension])) {
              return $this->aliases[$extension];
          }
          else {
              return null;
          }
      }
code: public function getAliases($extension = null)
      {
          if ($extension === null) {
              return $this->aliases;
          }
          elseif (isset($this->aliases[$extension])) {
              return $this->aliases[$extension];
          }
          else {
              return null;
          }
      }
code_tokens: public function getAliases ( $ extension = null ) { if ( $ extension === null ) { return $ this -> aliases ; } elseif ( isset ( $ this -> aliases [ $ extension ] ) ) { return $ this -> aliases [ $ extension ] ; } else { return null ; } }
docstring: Returns aliases.
  @param string $extension Extension name. Eg: css
  @return self
docstring_tokens: Returns aliases .