| /** |
| * ``` |
| * WhiteSpace :: |
| * - "Horizontal Tab (U+0009)" |
| * - "Space (U+0020)" |
| * ``` |
| * @internal |
| */ |
| export function isWhiteSpace(code) { |
| return code === 0x0009 || code === 0x0020; |
| } |
| /** |
| * ``` |
| * Digit :: one of |
| * - `0` `1` `2` `3` `4` `5` `6` `7` `8` `9` |
| * ``` |
| * @internal |
| */ |
| |
| export function isDigit(code) { |
| return code >= 0x0030 && code <= 0x0039; |
| } |
| /** |
| * ``` |
| * Letter :: one of |
| * - `A` `B` `C` `D` `E` `F` `G` `H` `I` `J` `K` `L` `M` |
| * - `N` `O` `P` `Q` `R` `S` `T` `U` `V` `W` `X` `Y` `Z` |
| * - `a` `b` `c` `d` `e` `f` `g` `h` `i` `j` `k` `l` `m` |
| * - `n` `o` `p` `q` `r` `s` `t` `u` `v` `w` `x` `y` `z` |
| * ``` |
| * @internal |
| */ |
| |
| export function isLetter(code) { |
| return ( |
| (code >= 0x0061 && code <= 0x007a) || // A-Z |
| (code >= 0x0041 && code <= 0x005a) // a-z |
| ); |
| } |
| /** |
| * ``` |
| * NameStart :: |
| * - Letter |
| * - `_` |
| * ``` |
| * @internal |
| */ |
| |
| export function isNameStart(code) { |
| return isLetter(code) || code === 0x005f; |
| } |
| /** |
| * ``` |
| * NameContinue :: |
| * - Letter |
| * - Digit |
| * - `_` |
| * ``` |
| * @internal |
| */ |
| |
| export function isNameContinue(code) { |
| return isLetter(code) || isDigit(code) || code === 0x005f; |
| } |