aureooms/js-rational

const _cmp_no_bounds = ({jz, lt0, mul, cmp}) => (a, b, c, d) => {
    if (jz(b)) {
        if (lt0(a)) {
            // A/b = -Infinity
            return jz(d)
                ? lt0(c)
                    ? 0 // B/d = -Infinity
                    : -1 // B/d = Infinity
                : -1; // B/d is finite
        }

        // A/b = Infinity
        return jz(d)
            ? lt0(c)
                ? 1 // B/d = -Infinity
                : 0 // B/d = Infinity
            : 1; // B/d is finite
    }

    // A/b is finite
    if (jz(d))
        return lt0(c)
            ? 1 // B/d = -Infinity
            : -1; // B/d = Infinity

    return cmp(mul(a, d), mul(b, c));
};

export default _cmp_no_bounds;