if                                (/\s/.test ($_))                                                       ++i;
                  else if                    ('([{}])'.indexOf ($_) > -1)                                                       expect_re =  ! (token = $_), ++i;
                  else if                ($_ === '/' && c(i + 1) === '*') while  (c(++i) !== '/' || c(i - 1) !== '*' || ! ++i);
                  else if                ($_ === '/' && c(i + 1) === '/') while             (c(++i) !== '\n' && c(i) !== '\r');
                  else if ($_ === '/' &&    expect_re &&  (token = '/'))  while (c(++i) !== '/' || c(i - 1) === '\\' || ! ++i)  expect_re =  ! (token += c(i));
                  else if ($_ === '"' && ! (expect_re = ! (token = '"'))) while (c(++i) !== '"' || c(i - 1) === '\\' || ! ++i)  token += c(i);
                  else if ($_ === "'" && ! (expect_re = ! (token = "'"))) while (c(++i) !== "'" || c(i - 1) === '\\' || ! ++i)  token += c(i);
                  else if          (expect_re && op($_) && (token = 'u')) while      (op($_ = c(i)) && precedence[token + $_])  expect_re = !! (token += $_), ++i;
                  else if                                        (op($_)) while      (op($_ = c(i)) && precedence[token + $_])  expect_re = !! (token += $_), ++i;
                  else                                                    while                            (idents[$_ = c(i)])  expect_re = !! precedence[token += $_], ++i;