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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | 7343959x 28x 1548458x | /**
* Internal helpers shared by the validators. Nothing here is exported from
* the package entry point.
*
* The validators read the input with `charCodeAt`, one UTF-16 code unit at a
* time, and never build new strings on their hot path.
*/
import type { IsValidOptions } from "./types";
/**
* Upper-cases the UTF-16 code of an ASCII letter (`a`-`z`, `A`-`Z`) and
* returns -1 for anything else. Internal helper.
*
* `code & ~32` clears the lower-case bit, but only after the range check:
* non-ASCII look-alikes that `toUpperCase()` maps to ASCII (U+0131 "ı" -> "I",
* U+017F "ſ" -> "S") must stay invalid (NORM-1 accepts lower-case ASCII only).
*/
export function toUpperAsciiLetter(code: number): number {
return ((code | 32) - 97) >>> 0 < 26 ? code & ~32 : -1;
}
/**
* Default options of the boolean validators, shared so that a call without
* options allocates nothing.
*/
export const NO_OPTIONS: IsValidOptions = {};
/**
* CIF-3: does the caller accept either a letter or a digit for C D F G J U V
* (`cifControl: "lenient"`)? `opts` comes from the caller and may be `null`
* or even a number (`array.filter(isValidNif)` passes the index), so it is
* read defensively.
*/
export function isLenientCif(opts: IsValidOptions | null): boolean {
return opts?.cifControl === "lenient";
}
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