malachite-q 0.9.2

The arbitrary-precision type Rational, with efficient algorithms partially derived from GMP and FLINT.
Documentation 
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// Copyright © 2026 Mikhail Hogrefe
//
// This file is part of Malachite.
//
// Malachite is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License (LGPL) as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version. See <https://www.gnu.org/licenses/>.

use itertools::Itertools;
use malachite_base::iterators::prefix_to_string;
use malachite_base::rational_sequences::RationalSequence;
use malachite_base::strings::ToDebugString;
use malachite_base::test_util::bench::{BenchmarkType, run_benchmark};
use malachite_base::test_util::generators::common::{GenConfig, GenMode};
use malachite_base::test_util::runner::Runner;
use malachite_nz::natural::Natural;
use malachite_q::test_util::bench::bucketers::pair_1_rational_bit_bucketer;
use malachite_q::test_util::generators::{
    rational_gen, rational_gen_var_7, rational_natural_pair_gen_var_1,
    rational_natural_pair_gen_var_2,
};

pub(crate) fn register(runner: &mut Runner) {
    register_demo!(runner, demo_rational_into_digits);
    register_demo!(runner, demo_rational_to_digits);
    register_demo!(runner, demo_rational_into_digits_decimal);
    register_demo!(runner, demo_rational_digits);
    register_demo!(runner, demo_rational_digits_decimal);
    register_bench!(runner, benchmark_rational_to_digits_evaluation_strategy);
    register_bench!(runner, benchmark_rational_digits);
}

fn to_string_helper(p: (Vec<Natural>, RationalSequence<Natural>)) -> String {
    let (before, after) = p;
    let mut s = "(".to_string();
    s.push_str(&before.to_debug_string());
    s.push_str(", ");
    s.push_str(&after.to_string());
    s.push(')');
    s
}

fn demo_rational_into_digits(gm: GenMode, config: &GenConfig, limit: usize) {
    for (n, base) in rational_natural_pair_gen_var_2()
        .get(gm, config)
        .take(limit)
    {
        println!(
            "({}).into_digits({}) = {}",
            n.clone(),
            base,
            to_string_helper(n.into_digits(&base))
        );
    }
}

fn demo_rational_to_digits(gm: GenMode, config: &GenConfig, limit: usize) {
    for (n, base) in rational_natural_pair_gen_var_2()
        .get(gm, config)
        .take(limit)
    {
        println!(
            "({}).to_digits({}) = {}",
            n,
            base,
            to_string_helper(n.to_digits(&base))
        );
    }
}

fn demo_rational_into_digits_decimal(gm: GenMode, config: &GenConfig, limit: usize) {
    for n in rational_gen_var_7().get(gm, config).take(limit) {
        println!(
            "({}).into_digits(10) = {}",
            n.clone(),
            to_string_helper(n.into_digits(&Natural::from(10u32)))
        );
    }
}

fn demo_rational_digits(gm: GenMode, config: &GenConfig, limit: usize) {
    for (n, base) in rational_natural_pair_gen_var_1()
        .get(gm, config)
        .take(limit)
    {
        let (before_point, after_point) = n.digits(&base);
        println!(
            "({}).digits({}) = ({:?}, {})",
            n,
            base,
            before_point,
            prefix_to_string(after_point, 20)
        );
    }
}

fn demo_rational_digits_decimal(gm: GenMode, config: &GenConfig, limit: usize) {
    for n in rational_gen().get(gm, config).take(limit) {
        let (before_point, after_point) = n.digits(&Natural::from(10u32));
        println!(
            "({}).digits(10) = ({:?}, {})",
            n,
            before_point,
            prefix_to_string(after_point, 20)
        );
    }
}

fn benchmark_rational_to_digits_evaluation_strategy(
    gm: GenMode,
    config: &GenConfig,
    limit: usize,
    file_name: &str,
) {
    run_benchmark(
        "Rational.to_digits(u64)",
        BenchmarkType::EvaluationStrategy,
        rational_natural_pair_gen_var_2().get(gm, config),
        gm.name(),
        limit,
        file_name,
        &pair_1_rational_bit_bucketer("x"),
        &mut [
            ("Rational.into_digits(&base)", &mut |(n, base)| {
                no_out!(n.into_digits(&base));
            }),
            ("Rational.to_digits(&base)", &mut |(n, base)| {
                no_out!(n.to_digits(&base));
            }),
        ],
    );
}

fn benchmark_rational_digits(gm: GenMode, config: &GenConfig, limit: usize, file_name: &str) {
    run_benchmark(
        "Rational.digits(u64)",
        BenchmarkType::Single,
        rational_natural_pair_gen_var_1().get(gm, config),
        gm.name(),
        limit,
        file_name,
        &pair_1_rational_bit_bucketer("x"),
        &mut [(
            "Rational.digits(&base).1.take(20).collect_vec()",
            &mut |(n, base)| no_out!(n.digits(&base).1.take(20).collect_vec()),
        )],
    );
}