original_string: function lookup($key)
      {
          if (!isset($this->_styles[$key])) {
              return null;
          }
  
          return $this->_styles[$key];
      }
code: function lookup($key)
      {
          if (!isset($this->_styles[$key])) {
              return null;
          }
  
          return $this->_styles[$key];
      }
code_tokens: function lookup ( $ key ) { if ( ! isset ( $ this -> _styles [ $ key ] ) ) { return null ; } return $ this -> _styles [ $ key ] ; }
docstring: lookup a specific Style collection
  
  lookup() returns the Style collection specified by $key, or null if the Style is
  not found.
  
  @param string $key the selector of the requested Style
  @return Style
  
  @Fixme _styles is a two dimensional array. It should produce wrong results
docstring_tokens: lookup a specific Style collection