code: function adjacent(left, right) {
          left = left || token;
          right = right || nexttoken;
          if (option.white) {
              if (left.character !== right.from && left.line === right.line) {
                  left.from += (left.character - left.from);
                  warning("Unexpected space after '{a}'.", left, left.value);
              }
          }
      }
docs: Functions for conformance of style.