import { If } from "../boolean";
import { Length as ListLength } from "../list";
import { IsLiteral } from ".";
/**
 * gets the length of a string literal
 */
type _Length<S extends string, Acc extends never[] = []> = S extends '' ? ListLength<Acc> : S extends `${infer H}${infer T}` ? _Length<T, [...Acc, never]> : number;
/**
 * gets the length of a string as the number of characters.
 *
 * @warning unicode symbols may count as 2 characters, as code points are not distinguished.
 *
 * @since 0.0.2
 *
 * @example
 * type e0 = Length<string>             // number
 * type e1 = Length<`${number}`>        // number
 * type e2 = Length<'foo'>              // 3
 * type e3 = Length<`foo${string}`>     // number
 * type e4 = Length<`${string}foo`>     // number
 * type e5 = Length<`foo${string}bar`>  // number
 *
 * // string consisting of 512 "0" characters
 * type t6 = '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
 * type e6 = Length<t6>                 // 512
 *
 * type w0 = Length<'✅'> // 1
 * type s1 = Length<'🔥'> // 2
 *
 */
export type Length<S extends string> = If<IsLiteral<S>, _Length<S>, number>;
export {};
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