kib 7.1.1

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Documentation 
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/*
==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--==--

KiB

Copyright (C) 2016-2017, 2019-2020, 2022, 2024-2025  Anonymous

There are several releases over multiple years,
they are listed as ranges, such as: "2016-2017".

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.

::--::--::--::--::--::--::--::--::--::--::--::--::--::--::--::--
*/

use alloc::{
    borrow::Cow,
    string::String,
};

mod impls;

const ZERO: &str = concat!('0');

const DIGITS: &str = concat!(
    "000001002003004005006007008009010011012013014015016017018019020021022023024025026027028029030031032033034035036037038039040041042043044",
    "045046047048049050051052053054055056057058059060061062063064065066067068069070071072073074075076077078079080081082083084085086087088089",
    "090091092093094095096097098099100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134",
    "135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179",
    "180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224",
    "225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269",
    "270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314",
    "315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359",
    "360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404",
    "405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449",
    "450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494",
    "495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539",
    "540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584",
    "585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629",
    "630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674",
    "675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719",
    "720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764",
    "765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797798799800801802803804805806807808809",
    "810811812813814815816817818819820821822823824825826827828829830831832833834835836837838839840841842843844845846847848849850851852853854",
    "855856857858859860861862863864865866867868869870871872873874875876877878879880881882883884885886887888889890891892893894895896897898899",
    "900901902903904905906907908909910911912913914915916917918919920921922923924925926927928929930931932933934935936937938939940941942943944",
    "945946947948949950951952953954955956957958959960961962963964965966967968969970971972973974975976977978979980981982983984985986987988989",
    "990991992993994995996997998999",
);

#[test]
fn test_digits() {
    for i in 0..=999 {
        let s = alloc::format!("{:03}", i);
        let i = i * 3;
        assert_eq!(s, &DIGITS[i .. i + 3]);
    }
}

/// # A wrapper for integers
///
/// You rarely use this directly, but [`fmt_int()`](fn.fmt_int.html).
#[derive(Debug, Clone, Copy)]
pub enum Int {

    /// # Usize
    Usize(usize),

    /// # Isize
    Isize(isize),

    /// # U64
    U64(u64),

    /// # I64
    I64(i64),

}

impl Int {

    /// # Formats self
    pub fn fmt(&self) -> Cow<'static, str> {
        macro_rules! fmt { ($n: expr, $negative: ident) => {{
            let mut result = String::with_capacity(($n.ilog2() / 2) as usize);
            let top = 1_000;
            let mut n = $n;
            while n >= top {
                let i = (n % top) as usize * 3;
                result.insert_str(usize::MIN, &DIGITS[i .. i + 3]);
                result.insert(usize::MIN, '_');
                n /= top;
            }
            match n {
                0..=9 => result.insert(usize::MIN, char::from((n as u8) + b'0')),
                _ => {
                    let i = (n as usize) * 3;
                    let k = if n >= 100 { usize::MIN } else { 1 };
                    result.insert_str(usize::MIN, &DIGITS[i + k .. i + 3]);
                },
            };
            if $negative {
                result.insert(usize::MIN, '-');
            }
            result.into()
        }}}
        match self {
            Self::Usize(usize::MIN) => ZERO.into(),
            Self::Usize(n) => fmt!(*n, false),
            Self::U64(u64::MIN) => ZERO.into(),
            Self::U64(n) => fmt!(*n, false),

            Self::Isize(0) => ZERO.into(),
            Self::Isize(n) => {
                let (n, negative) = (n.unsigned_abs(), n.is_negative());
                fmt!(n, negative)
            },
            Self::I64(0) => ZERO.into(),
            Self::I64(n) => {
                let (n, negative) = (n.unsigned_abs(), n.is_negative());
                fmt!(n, negative)
            },
        }
    }

}

/// # Formats an integer, with underscore (`_`) used as digit grouping
///
/// ## Examples
///
/// ```
/// assert_eq!(kib::fmt_int(i64::MIN), "-9_223_372_036_854_775_808");
/// assert_eq!(kib::fmt_int(-1234567890), "-1_234_567_890");
/// ```
pub fn fmt_int<N>(n: N) -> Cow<'static, str> where N: Into<Int> {
    n.into().fmt()
}