RunasSudo
13f1885eb5
viz. --round-{tvs,votes,weights}, --defer-surpluses, --meek-immediate-elect and --meek-surplus-tolerance
354 lines
7.9 KiB
Rust
354 lines
7.9 KiB
Rust
/* OpenTally: Open-source election vote counting
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* Copyright © 2021 Lee Yingtong Li (RunasSudo)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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use super::{Assign, Number};
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use ibig::{IBig, ops::Abs};
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use num_traits::{Num, One, Zero};
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use std::cmp::{Ord, PartialEq, PartialOrd};
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use std::ops;
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use std::fmt;
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static mut DPS: Option<usize> = None;
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static mut FACTOR: Option<IBig> = None;
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#[inline]
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pub fn get_dps() -> usize {
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unsafe { DPS.unwrap() }
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}
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#[inline]
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fn get_factor() -> &'static IBig {
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unsafe { FACTOR.as_ref().unwrap() }
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}
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/// Fixed-point number
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#[derive(Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
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pub struct Fixed(IBig);
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impl Fixed {
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/// Set the number of decimal places to compute results to
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pub fn set_dps(dps: usize) {
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unsafe {
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DPS = Some(dps);
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FACTOR = Some(IBig::from(10).pow(dps));
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}
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}
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}
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impl Number for Fixed {
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fn new() -> Self { Self(IBig::zero()) }
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fn describe() -> String { format!("--numbers fixed --decimals {}", get_dps()) }
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fn pow_assign(&mut self, exponent: i32) {
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self.0 = self.0.pow(exponent as usize) * get_factor() / get_factor().pow(exponent as usize);
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}
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fn floor_mut(&mut self, dps: usize) {
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// Only do something if truncating
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if dps < get_dps() {
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let factor = IBig::from(10).pow(get_dps() - dps);
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self.0 /= &factor;
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self.0 *= factor;
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}
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}
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fn ceil_mut(&mut self, dps: usize) {
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// Only do something if truncating
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if dps < get_dps() {
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self.0 -= IBig::one();
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let factor = IBig::from(10).pow(get_dps() - dps);
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self.0 /= &factor;
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self.0 += IBig::one();
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self.0 *= factor;
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}
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}
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fn parse(s: &str) -> Self {
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// Parse decimal
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if s.contains('.') {
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let (whole, decimal) = s.split_once('.').unwrap();
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let whole = match IBig::from_str_radix(whole, 10) {
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Ok(value) => value,
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Err(_) => panic!("Syntax Error"),
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} * get_factor();
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let decimal = match IBig::from_str_radix(decimal, 10) {
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Ok(value) => value,
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Err(_) => panic!("Syntax Error"),
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} * get_factor() / IBig::from(10).pow(decimal.len());
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return Self(whole + decimal);
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}
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// Parse integer
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if let Ok(value) = Self::from_str_radix(s, 10) {
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return value;
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} else {
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panic!("Syntax Error");
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}
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}
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}
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impl Num for Fixed {
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type FromStrRadixErr = ibig::error::ParseError;
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fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
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match IBig::from_str_radix(str, radix) {
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Ok(value) => Ok(Self(value * get_factor())),
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Err(err) => Err(err)
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}
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}
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}
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impl Assign for Fixed {
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fn assign(&mut self, src: Self) { self.0 = src.0 }
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}
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impl Assign<&Self> for Fixed {
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fn assign(&mut self, src: &Self) { self.0 = src.0.clone() }
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}
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impl From<usize> for Fixed {
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fn from(n: usize) -> Self { Self(IBig::from(n) * get_factor()) }
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}
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impl From<f64> for Fixed {
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fn from(n: f64) -> Self {
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return Self(IBig::from((n * 10_f64.powi(get_dps() as i32)).round() as u32))
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}
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}
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// TODO: Fix rounding
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impl fmt::Display for Fixed {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let dps = match f.precision() {
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Some(precision) => if precision < get_dps() { precision } else { get_dps() },
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None => get_dps(),
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};
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let mut result;
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if dps == get_dps() {
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result = self.0.clone().abs().to_string();
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} else {
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// Rounding required
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let factor = IBig::from(10).pow(get_dps() - dps - 1); // -1 to account for rounding digit
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let mut rounded = (&self.0 / factor).abs() + IBig::from(5); // Add 5 to force round-to-nearest
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rounded /= IBig::from(10); // Remove rounding digit
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result = rounded.to_string();
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}
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//let should_add_minus = (self.0 < IBig::zero()) && result != "0";
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let should_add_minus = self.0 < IBig::zero();
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// Add leading 0s
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result = format!("{0:0>1$}", result, dps + 1);
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// Add the decimal point
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if dps > 0 {
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result.insert(result.len() - dps, '.');
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}
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// Add the sign
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if should_add_minus {
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result.insert(0, '-');
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}
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return f.write_str(&result);
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}
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}
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impl One for Fixed {
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fn one() -> Self { Self(get_factor().clone()) }
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}
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impl Zero for Fixed {
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fn zero() -> Self { Self::new() }
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fn is_zero(&self) -> bool { self.0.is_zero() }
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}
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impl ops::Neg for Fixed {
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type Output = Self;
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fn neg(self) -> Self::Output { Self(-self.0) }
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}
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impl ops::Add for Fixed {
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type Output = Self;
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fn add(self, rhs: Self) -> Self::Output { Self(self.0 + rhs.0) }
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}
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impl ops::Sub for Fixed {
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type Output = Self;
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fn sub(self, _rhs: Self) -> Self::Output {
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todo!()
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}
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}
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impl ops::Mul for Fixed {
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type Output = Self;
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fn mul(self, _rhs: Self) -> Self::Output {
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todo!()
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}
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}
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impl ops::Div for Fixed {
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type Output = Self;
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fn div(self, rhs: Self) -> Self::Output { Self(self.0 * get_factor() / rhs.0) }
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}
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impl ops::Rem for Fixed {
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type Output = Self;
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fn rem(self, _rhs: Self) -> Self::Output {
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todo!()
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}
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}
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impl ops::Add<&Self> for Fixed {
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type Output = Self;
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fn add(self, rhs: &Self) -> Self::Output { Self(self.0 + &rhs.0) }
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}
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impl ops::Sub<&Self> for Fixed {
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type Output = Self;
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fn sub(self, rhs: &Self) -> Self::Output { Self(self.0 - &rhs.0) }
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}
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impl ops::Mul<&Self> for Fixed {
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type Output = Self;
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fn mul(self, rhs: &Self) -> Self::Output { Self(self.0 * &rhs.0 / get_factor()) }
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}
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impl ops::Div<&Self> for Fixed {
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type Output = Self;
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fn div(self, rhs: &Self) -> Self::Output { Self(self.0 * get_factor() / &rhs.0) }
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}
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impl ops::Rem<&Self> for Fixed {
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type Output = Self;
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fn rem(self, _rhs: &Self) -> Self::Output {
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todo!()
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}
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}
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impl ops::AddAssign for Fixed {
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fn add_assign(&mut self, rhs: Self) { self.0 += rhs.0; }
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}
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impl ops::SubAssign for Fixed {
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fn sub_assign(&mut self, rhs: Self) { self.0 -= rhs.0; }
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}
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impl ops::MulAssign for Fixed {
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fn mul_assign(&mut self, rhs: Self) {
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self.0 *= rhs.0;
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self.0 /= get_factor();
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}
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}
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impl ops::DivAssign for Fixed {
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fn div_assign(&mut self, rhs: Self) {
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self.0 *= get_factor();
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self.0 /= rhs.0;
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}
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}
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impl ops::RemAssign for Fixed {
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fn rem_assign(&mut self, _rhs: Self) {
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todo!()
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}
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}
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impl ops::AddAssign<&Self> for Fixed {
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fn add_assign(&mut self, rhs: &Self) { self.0 += &rhs.0; }
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}
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impl ops::SubAssign<&Self> for Fixed {
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fn sub_assign(&mut self, rhs: &Self) { self.0 -= &rhs.0; }
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}
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impl ops::MulAssign<&Self> for Fixed {
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fn mul_assign(&mut self, rhs: &Self) {
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self.0 *= &rhs.0;
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self.0 /= get_factor();
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}
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}
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impl ops::DivAssign<&Self> for Fixed {
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fn div_assign(&mut self, _rhs: &Self) {
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todo!()
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}
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}
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impl ops::RemAssign<&Self> for Fixed {
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fn rem_assign(&mut self, _rhs: &Self) {
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todo!()
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}
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}
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impl ops::Neg for &Fixed {
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type Output = Fixed;
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fn neg(self) -> Self::Output { Fixed(-&self.0) }
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}
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impl ops::Add<Self> for &Fixed {
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type Output = Fixed;
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fn add(self, rhs: Self) -> Self::Output { Fixed(&self.0 + &rhs.0) }
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}
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impl ops::Sub<Self> for &Fixed {
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type Output = Fixed;
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fn sub(self, rhs: Self) -> Self::Output { Fixed(&self.0 - &rhs.0) }
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}
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impl ops::Mul<Self> for &Fixed {
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type Output = Fixed;
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fn mul(self, rhs: Self) -> Self::Output { Fixed(&self.0 * &rhs.0 / get_factor()) }
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}
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impl ops::Div<Self> for &Fixed {
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type Output = Fixed;
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fn div(self, rhs: Self) -> Self::Output { Fixed(&self.0 * get_factor() / &rhs.0) }
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}
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impl ops::Rem<Self> for &Fixed {
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type Output = Fixed;
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fn rem(self, _rhs: Self) -> Self::Output {
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todo!()
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}
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}
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/*
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impl ops::Add<&&Rational> for &Rational {
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}
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impl ops::Sub<&&Rational> for &Rational {
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}
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impl ops::Mul<&&Rational> for &Rational {
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}
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impl ops::Div<&&Rational> for &Rational {
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}
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impl ops::Rem<&&Rational> for &Rational {
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}
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*/
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