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