123 lines
3.2 KiB
JavaScript
123 lines
3.2 KiB
JavaScript
/* eslint no-shadow:0, no-param-reassign:0 */
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export const _ = '@@updeep/placeholder';
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function countArguments(args, max) {
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let n = args.length;
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if (n > max) n = max;
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while (args[n - 1] === _) {
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n--;
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}
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return n;
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}
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export function curry1(fn) {
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return function curried(a, ...[b, c]) {
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const n = countArguments(arguments);
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if (n >= 1) return fn(a, b, c);
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return curried;
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};
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}
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export function curry2(fn) {
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return function curried(a, b, ...[c, d]) {
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const n = countArguments(arguments, 2);
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if (b === _ || c === _ || d === _) {
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throw new Error('Can only use placeholder on first argument of this function.');
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}
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if (n >= 2) {
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if (a === _) return curry1((a, c, d) => fn(a, b, c, d));
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return fn(a, b, c, d);
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}
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if (n === 1) return curry1((b, c, d) => fn(a, b, c, d));
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return curried;
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};
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}
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export function curry3(fn) {
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return function curried(a, b, c, ...[d, e]) {
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const n = countArguments(arguments, 3);
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if (c === _ || d === _ || e === _) {
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throw new Error('Can only use placeholder on first or second argument of this function.');
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}
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if (n >= 3) {
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if (a === _) {
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if (b === _) return curry2((a, b, d, e) => fn(a, b, c, d, e));
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return curry1((a, d, e) => fn(a, b, c, d, e));
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}
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if (b === _) return curry1((b, d, e) => fn(a, b, c, d, e));
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return fn(a, b, c, d, e);
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}
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if (n === 2) {
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if (a === _) return curry2((a, c, d, e) => fn(a, b, c, d, e));
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return curry1((c, d, e) => fn(a, b, c, d, e));
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}
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if (n === 1) return curry2((b, c, d, e) => fn(a, b, c, d, e));
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return curried;
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};
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}
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export function curry4(fn) {
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return function curried(a, b, c, d, ...[e, f]) {
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const n = countArguments(arguments, 4);
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if (d === _ || e === _ || f === _) {
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throw new Error('Can only use placeholder on first, second or third argument of this function.');
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}
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if (n >= 4) {
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if (a === _) {
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if (b === _) {
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if (c === _) return curry3((a, b, c, e, f) => fn(a, b, c, d, e, f));
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return curry2((a, b, e, f) => fn(a, b, c, d, e, f));
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}
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if (c === _) return curry2((a, c, e, f) => fn(a, b, c, d, e, f));
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return curry1((a, e, f) => fn(a, b, c, d, e, f));
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}
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if (b === _) {
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if (c === _) return curry2((b, c, e, f) => fn(a, b, c, d, e, f));
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return curry1((b, e, f) => fn(a, b, c, d, e, f));
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}
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if (c === _) return curry1((c, e, f) => fn(a, b, c, d, e, f));
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return fn(a, b, c, d, e, f);
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}
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if (n === 3) {
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if (a === _) {
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if (b === _) return curry3((a, b, d, e, f) => fn(a, b, c, d, e, f));
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return curry2((a, d, e, f) => fn(a, b, c, d, e, f));
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}
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if (b === _) return curry2((b, d, e, f) => fn(a, b, c, d, e, f));
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return curry1((d, e, f) => fn(a, b, c, d, e, f));
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}
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if (n === 2) {
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if (a === _) return curry3((a, c, d, e, f) => fn(a, b, c, d, e, f));
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return curry2((c, d, e, f) => fn(a, b, c, d, e, f));
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}
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if (n === 1) return curry3((b, c, d, e, f) => fn(a, b, c, d, e, f));
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return curried;
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};
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}
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export default function curry(fn, length = fn.length) {
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return [
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fn,
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curry1,
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curry2,
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curry3,
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curry4,
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][length](fn);
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}
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