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assertValidName: share character classes with lexer (#3287)
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/** | ||
* ``` | ||
* Digit :: one of | ||
* - `0` `1` `2` `3` `4` `5` `6` `7` `8` `9` | ||
* ``` | ||
* @internal | ||
*/ | ||
export function isDigit(code: number): boolean { | ||
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: number): boolean { | ||
return ( | ||
(code >= 0x0061 && code <= 0x007a) || // A-Z | ||
(code >= 0x0041 && code <= 0x005a) // a-z | ||
); | ||
} | ||
|
||
/** | ||
* ``` | ||
* NameStart :: | ||
* - Letter | ||
* - `_` | ||
* ``` | ||
* @internal | ||
*/ | ||
export function isNameStart(code: number): boolean { | ||
return isLetter(code) || code === 0x005f; | ||
} | ||
|
||
/** | ||
* ``` | ||
* NameContinue :: | ||
* - Letter | ||
* - Digit | ||
* - `_` | ||
* ``` | ||
* @internal | ||
*/ | ||
export function isNameContinue(code: number): boolean { | ||
return isLetter(code) || isDigit(code) || code === 0x005f; | ||
} |
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