original_string: public function atomAt($index)
      {
          $atom = $this->atomAtDefault($index);
          if (null === $atom) {
              throw new Exception\UndefinedAtomException($index);
          }
  
          return $atom;
      }
code: public function atomAt($index)
      {
          $atom = $this->atomAtDefault($index);
          if (null === $atom) {
              throw new Exception\UndefinedAtomException($index);
          }
  
          return $atom;
      }
code_tokens: public function atomAt ( $ index ) { $ atom = $ this -> atomAtDefault ( $ index ) ; if ( null === $ atom ) { throw new Exception \ UndefinedAtomException ( $ index ) ; } return $ atom ; }
docstring: Get a single path atom by index.
  
  @param integer $index The index to search for.
  
  @return string                           The path atom.
  @throws Exception\UndefinedAtomException If the index does not exist in this path's atoms.
docstring_tokens: Get a single path atom by index .