aureooms/js-rational-field

import {__factorize__} from '@aureooms/js-prime';
import {$2, iadd1, eq0, gt1, divmod} from '@aureooms/js-number';
import {
    _add,
    _sub,
    _mul,
    _div,
    _pow,
    _cmp_no_bounds,
    _simplify,
    _digits,
    _stringify_digits,
    _parse_fraction,
    _parse_fixed_point,
} from '@aureooms/js-rational';

export default function _make_methods(domain) {
    const primefactors = new Map();
    const factorize = __factorize__($2, iadd1, eq0, gt1, divmod);
    const ufactors = (n) => {
        if (!primefactors.has(n)) primefactors.set(n, new Set(factorize(n)));
        return primefactors.get(n);
    };

    const add = _add(domain);
    const sub = _sub(domain);
    const mul = _mul(domain);
    const div = _div(domain);
    const pow = _pow(domain);
    const cmp = _cmp_no_bounds(domain);
    const simplify = _simplify(domain);

    const stringify_fraction = (x, d, b) =>
        domain.eq1(d)
            ? domain.str(x, b)
            : `${domain.str(x, b)}/${domain.str(d, b)}`;

    const digits = _digits(domain);
    const stringify_digits = _stringify_digits(domain);
    const stringify_fixed_point = (x, d, b) =>
        stringify_digits(b, digits(b, ufactors(b), x, d));

    const parse_fraction = _parse_fraction(domain);
    const parse_fixed_point = _parse_fixed_point(domain);

    return {
        add,
        sub,
        mul,
        div,
        pow,
        cmp,
        simplify,
        stringify_fixed_point,
        stringify_fraction,
        parse_fraction,
        parse_fixed_point,
    };
}