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- /**
- * ```
- * 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;
- }
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