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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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | 4x 30254x 27563x 27563x 809x 809x 244x 244x 244x 26267x 244x 26286x 26286x 26286x 26574x 26574x 26286x 224x 224x | /**
* Tokens used to specify random string generation options
*/
export type Token = TokenLiteral | TokenPick | TokenRepeat | TokenChar | TokenList;
/**
* A string literal to use as-is.
*/
export type TokenLiteral = string;
/**
* Picks a random token from the provided tokens.
*/
export type TokenPick = [type: 'pick', ...from: Token[]];
/**
* Repeats `pattern` a random number of times between `min` and `max`.
*/
export type TokenRepeat = [type: 'repeat', min: number, max: number, pattern: Token];
/**
* Specifies a Unicode code point range from which to pick a random character.
* The `count` parameter specifies how many characters to pick, defaults to 1.
*/
export type TokenChar = [type: 'char', min: number, max: number, count?: number];
/**
* Executes a list of `every` tokens in sequence.
*/
export type TokenList = [type: 'list', ...every: Token[]];
/**
* Generates a random string based on the provided token.
* @param token The token defining the random string generation.
* @returns A randomly generated string.
*/
export function randomString(token: Token): string {
if (typeof token === 'string') return token;
const rnd = Math.random();
switch (token[0]) {
case 'pick': {
const [, ...from] = token;
return randomString(from[Math.floor(rnd * from.length)]);
}
case 'repeat': {
const [, min, max, pattern] = token;
const count = Math.floor(rnd * (max - min + 1)) + min;
let str = '';
for (let i = 0; i < count; i++) str += randomString(pattern);
return str;
}
case 'char': {
const [, min, max, count = 1] = token;
let str = '';
for (let i = 0; i < count; i++) {
const codePoint = Math.floor(rnd * (max - min + 1)) + min;
str += String.fromCodePoint(codePoint);
}
return str;
}
case 'list': {
const [, ...every] = token;
return every.map(randomString).join('');
}
default:
throw new Error('Invalid token type');
}
}
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