nth-check/lib/index.d.ts

import { parse } from "./parse.js";
import { compile, generate } from "./compile.js";
export { parse, compile, generate };
/**
 * Parses and compiles a formula to a highly optimized function.
 * Combination of {@link parse} and {@link compile}.
 *
 * If the formula doesn't match any elements,
 * it returns [`boolbase`](https://github.com/fb55/boolbase)'s `falseFunc`.
 * Otherwise, a function accepting an _index_ is returned, which returns
 * whether or not the passed _index_ matches the formula.
 *
 * Note: The nth-rule starts counting at `1`, the returned function at `0`.
 *
 * @param formula The formula to compile.
 * @example
 * const check = nthCheck("2n+3");
 *
 * check(0); // `false`
 * check(1); // `false`
 * check(2); // `true`
 * check(3); // `false`
 * check(4); // `true`
 * check(5); // `false`
 * check(6); // `true`
 */
export default function nthCheck(formula: string): (index: number) => boolean;
/**
 * Parses and compiles a formula to a generator that produces a sequence of indices.
 * Combination of {@link parse} and {@link generate}.
 *
 * @param formula The formula to compile.
 * @returns A function that produces a sequence of indices.
 * @example <caption>Always increasing</caption>
 *
 * ```js
 * const gen = nthCheck.sequence('2n+3')
 *
 * gen() // `1`
 * gen() // `3`
 * gen() // `5`
 * gen() // `8`
 * gen() // `11`
 * ```
 *
 * @example <caption>With end value</caption>
 *
 * ```js
 *
 * const gen = nthCheck.sequence('-2n+5');
 *
 * gen() // 0
 * gen() // 2
 * gen() // 4
 * gen() // null
 * ```
 */
export declare function sequence(formula: string): () => number | null;
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