function parseLeftHandOperators(state) {
    var node, operators, name, fn, params;
    node = parseCustomNodes(state);
    operators = {
      '!': 'factorial',
      '\'': 'ctranspose'
    };

    while (operators.hasOwnProperty(state.token)) {
      name = state.token;
      fn = operators[name];
      getToken(state);
      params = [node];
      node = new OperatorNode(name, fn, params);
      node = parseAccessors(state, node);
    }

    return node;
  }
Left hand operators: factorial x!, ctranspose x'
@return {Node} node
@private