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GNU AFFERO GENERAL PUBLIC LICENSE
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "822d7d63e0c0260a050f6b1f0d316f5c79b9eab830aca526ed904e1011bd64ca"
[[package]]
name = "gmp-mpfr-sys"
version = "1.4.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "18e70045792b1d584ef8d8ac5e890a98d9d6499d2d709cf2b23725b6dcb10064"
dependencies = [
"libc",
"winapi",
]
[[package]]
name = "libc"
version = "0.2.95"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "789da6d93f1b866ffe175afc5322a4d76c038605a1c3319bb57b06967ca98a36"
[[package]]
name = "num-traits"
version = "0.2.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
dependencies = [
"autocfg",
]
[[package]]
name = "opentally"
version = "0.1.0"
dependencies = [
"num-traits",
"rug",
]
[[package]]
name = "rug"
version = "1.12.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "32f75e07492c4d17d12f226d17e689fdb698db7a1e875fca0fac15626283bf24"
dependencies = [
"az",
"gmp-mpfr-sys",
"libc",
]
[[package]]
name = "winapi"
version = "0.3.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
dependencies = [
"winapi-i686-pc-windows-gnu",
"winapi-x86_64-pc-windows-gnu",
]
[[package]]
name = "winapi-i686-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
[[package]]
name = "winapi-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

13
Cargo.toml Normal file
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@ -0,0 +1,13 @@
[package]
name = "opentally"
version = "0.1.0"
authors = ["Lee Yingtong Li <runassudo@yingtongli.me>"]
edition = "2018"
[dependencies]
num-traits = "0.2"
[dependencies.rug]
version = "1.12"
default-features = false
features = ["integer", "rational", "float"]

209
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/* OpenTally: Open-source election vote counting
* Copyright © 2021 Lee Yingtong Li (RunasSudo)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use crate::numbers::Number;
use std::collections::HashMap;
use std::io::{BufRead, Lines};
pub struct Election<N> {
pub seats: usize,
pub candidates: Vec<Candidate>,
pub ballots: Vec<Ballot<N>>,
}
impl<N: Number> Election<N> {
pub fn from_blt<B: BufRead>(mut lines: Lines<B>) -> Self {
// Read first line
let line = lines.next().expect("Unexpected EOF").expect("IO Error");
let mut bits = line.split(" ");
let num_candidates = bits.next().expect("Syntax Error").parse().expect("Syntax Error");
let seats: usize = bits.next().expect("Syntax Error").parse().expect("Syntax Error");
// Initialise the Election object
let mut election = Election {
seats: seats,
candidates: Vec::with_capacity(num_candidates),
ballots: Vec::new(),
};
// Read ballots
for line in &mut lines {
let line = line.expect("IO Error");
if line == "0" {
break;
}
let mut bits = line.split(" ");
let value = N::parse(bits.next().expect("Syntax Error"));
let mut ballot = Ballot {
orig_value: value,
preferences: Vec::new(),
};
for preference in bits {
if preference != "0" {
let preference = preference.parse::<usize>().expect("Syntax Error");
ballot.preferences.push(preference - 1);
}
}
election.ballots.push(ballot);
}
// Read candidates
for line in lines.take(num_candidates) {
let mut line = &line.expect("IO Error")[..];
if line.starts_with("\"") && line.ends_with("\"") {
line = &line[1..line.len()-1];
}
election.candidates.push(Candidate { name: line.to_string() });
}
return election;
}
}
#[derive(PartialEq, Eq, Hash)]
pub struct Candidate {
pub name: String,
}
#[derive(Clone)]
pub struct CountState<'a, N> {
pub election: &'a Election<N>,
pub candidates: HashMap<&'a Candidate, CountCard<'a, N>>,
pub exhausted: CountCard<'a, N>,
pub quota: N,
pub num_elected: usize,
pub num_excluded: usize,
}
impl<'a, N: Number> CountState<'a, N> {
pub fn new(election: &'a Election<N>) -> Self {
let mut state = CountState {
election: &election,
candidates: HashMap::new(),
exhausted: CountCard::new(),
quota: N::new(),
num_elected: 0,
num_excluded: 0,
};
for candidate in election.candidates.iter() {
state.candidates.insert(candidate, CountCard::new());
}
return state;
}
pub fn step_all(&mut self) {
for (_, count_card) in self.candidates.iter_mut() {
count_card.step();
}
self.exhausted.step();
}
}
pub enum CountStateOrRef<'a, N> {
State(CountState<'a, N>),
Ref(&'a CountState<'a, N>),
}
impl<'a, N> CountStateOrRef<'a, N> {
pub fn as_ref(&self) -> &CountState<N> {
match self {
CountStateOrRef::State(state) => &state,
CountStateOrRef::Ref(state) => state,
}
}
}
pub struct StageResult<'a, N> {
pub title: &'a str,
pub logs: Vec<&'a str>,
pub state: CountStateOrRef<'a, N>,
}
#[derive(Clone)]
pub struct CountCard<'a, N> {
pub state: CandidateState,
pub order_elected: isize,
pub orig_votes: N,
pub transfers: N,
pub votes: N,
pub parcels: Vec<Parcel<'a, N>>,
}
impl<'a, N: Number> CountCard<'a, N> {
pub fn new() -> Self {
return CountCard {
state: CandidateState::HOPEFUL,
order_elected: 0,
orig_votes: N::new(),
transfers: N::new(),
votes: N::new(),
parcels: Vec::new(),
};
}
//pub fn votes(&'a self) -> N {
// return self.orig_votes.clone() + &self.transfers;
//}
pub fn transfer(&mut self, transfer: &'_ N) {
self.transfers += transfer;
self.votes += transfer;
}
pub fn step(&mut self) {
self.orig_votes = self.votes.clone();
self.transfers = N::new();
}
}
pub type Parcel<'a, N> = Vec<Vote<'a, N>>;
#[derive(Clone)]
pub struct Vote<'a, N> {
pub ballot: &'a Ballot<N>,
pub value: N,
pub up_to_pref: usize,
}
pub struct Ballot<N> {
pub orig_value: N,
pub preferences: Vec<usize>,
}
#[allow(dead_code)]
#[derive(PartialEq)]
#[derive(Clone)]
pub enum CandidateState {
HOPEFUL,
GUARDED,
ELECTED,
DOOMED,
EXCLUDED,
}

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/* OpenTally: Open-source election vote counting
* Copyright © 2021 Lee Yingtong Li (RunasSudo)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
mod election;
mod numbers;
mod stv;
use crate::election::{CandidateState, CountState, CountStateOrRef, Election, StageResult};
use crate::numbers::{Number, NumType};
use std::env;
use std::fs::File;
use std::io::{self, BufRead};
const DECIMAL_PLACES: usize = 0;
fn print_stage<N: Number>(stage_num: usize, result: &StageResult<N>) {
println!("{}. {}", stage_num, result.title);
println!("{}", result.logs.join(" "));
// Sort candidates
//let mut candidates: Vec<(&&Candidate, &CountCard<N>)> = result.state.candidates.iter().collect();
//candidates.sort_unstable_by(|a, b| a.1.votes.partial_cmp(&b.1.votes).unwrap());
let candidates = result.state.as_ref().election.candidates.iter().map(|c| (c, result.state.as_ref().candidates.get(c).unwrap()));
// Print candidates
//for (candidate, count_card) in candidates.into_iter().rev() {
for (candidate, count_card) in candidates {
if count_card.state == CandidateState::ELECTED {
println!("- {}: {:.dps$} ({:.dps$}) - ELECTED {}", candidate.name, count_card.votes, count_card.transfers, count_card.order_elected, dps=DECIMAL_PLACES);
} else if count_card.state == CandidateState::EXCLUDED {
println!("- {}: {:.dps$} ({:.dps$}) - Excluded {}", candidate.name, count_card.votes, count_card.transfers, -count_card.order_elected, dps=DECIMAL_PLACES);
} else {
println!("- {}: {:.dps$} ({:.dps$})", candidate.name, count_card.votes, count_card.transfers, dps=DECIMAL_PLACES);
}
}
println!("Quota: {:.dps$}", result.state.as_ref().quota, dps=DECIMAL_PLACES);
println!("");
}
fn main() {
// Read arguments
let file_name = env::args().skip(1).next().expect("First argument must be path to BLT file");
let should_clone_state = false;
// Read BLT file
let file = File::open(file_name).expect("IO Error");
let lines = io::BufReader::new(file).lines();
let election: Election<NumType> = Election::from_blt(lines);
// Initialise count state
let mut state = CountState::new(&election);
// Distribute first preferences
stv::distribute_first_preferences(&mut state);
stv::calculate_quota(&mut state);
stv::elect_meeting_quota(&mut state);
// Display
// TODO: Add logs during count
let result = StageResult {
title: "First preferences",
logs: vec!["First preferences distributed."],
state: if should_clone_state { CountStateOrRef::State(state.clone()) } else { CountStateOrRef::Ref(&state) },
};
print_stage(1, &result);
let mut stage_num = 1;
loop {
state.step_all();
stage_num += 1;
// Finish count
if stv::finished_before_stage(&state) {
break;
}
// Continue exclusions
if stv::continue_exclusion(&mut state) {
stv::elect_meeting_quota(&mut state);
let result = StageResult {
title: "Exclusion",
logs: vec!["Continuing exclusion."],
state: if should_clone_state { CountStateOrRef::State(state.clone()) } else { CountStateOrRef::Ref(&state) },
};
print_stage(stage_num, &result);
continue;
}
// Distribute surpluses
if stv::distribute_surpluses(&mut state) {
stv::elect_meeting_quota(&mut state);
let result = StageResult {
title: "Surplus",
logs: vec!["Surplus distributed."],
state: if should_clone_state { CountStateOrRef::State(state.clone()) } else { CountStateOrRef::Ref(&state) },
};
print_stage(stage_num, &result);
continue;
}
// Attempt bulk election
if stv::bulk_elect(&mut state) {
stv::elect_meeting_quota(&mut state);
let result = StageResult {
title: "Bulk election",
logs: vec!["Bulk election."],
state: if should_clone_state { CountStateOrRef::State(state.clone()) } else { CountStateOrRef::Ref(&state) },
};
print_stage(stage_num, &result);
continue;
}
// Exclude lowest hopeful
if stv::exclude_hopefuls(&mut state) {
stv::elect_meeting_quota(&mut state);
let result = StageResult {
title: "Exclusion",
logs: vec!["Candidate excluded."],
state: if should_clone_state { CountStateOrRef::State(state.clone()) } else { CountStateOrRef::Ref(&state) },
};
print_stage(stage_num, &result);
continue;
}
todo!();
}
println!("Count complete. The winning candidates are, in order of election:");
let mut winners = Vec::new();
for (candidate, count_card) in state.candidates.iter() {
if count_card.state == CandidateState::ELECTED {
winners.push((candidate, count_card.order_elected));
}
}
winners.sort_unstable_by(|a, b| a.1.partial_cmp(&b.1).unwrap());
for (i, (winner, _)) in winners.into_iter().enumerate() {
println!("{}. {}", i + 1, winner.name);
}
}

305
src/numbers.rs Normal file
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/* OpenTally: Open-source election vote counting
* Copyright © 2021 Lee Yingtong Li (RunasSudo)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use num_traits::{Num, NumAssignRef, NumRef, One, Zero};
use rug::{self, Assign, ops::Pow, rational::ParseRationalError};
use std::cmp::{Ordering, PartialEq, PartialOrd};
use std::convert::TryInto;
use std::fmt;
use std::ops;
//pub trait Number: NumRef + NumAssignRef + PartialOrd + Assign + Clone + fmt::Display where for<'a> &'a Self: RefNum<&'a Self> {
pub trait Number: NumRef + NumAssignRef + ops::Neg<Output=Self> + PartialOrd + Assign + Clone + fmt::Display where for<'a> Self: Assign<&'a Self>{
fn new() -> Self;
fn from(n: usize) -> Self;
fn floor_mut(&mut self);
fn parse(s: &str) -> Self {
if let Ok(value) = Self::from_str_radix(s, 10) {
return value;
} else {
panic!("Syntax Error");
}
}
}
pub struct Rational(rug::Rational);
impl Number for Rational {
fn new() -> Self { Self(rug::Rational::new()) }
fn from(n: usize) -> Self { Self(rug::Rational::from(n)) }
fn floor_mut(&mut self) { self.0.floor_mut() }
}
impl Num for Rational {
type FromStrRadixErr = ParseRationalError;
fn from_str_radix(str: &str, radix: u32) -> Result<Self, Self::FromStrRadixErr> {
match rug::Rational::parse_radix(str, radix.try_into().unwrap()) {
Ok(value) => Ok(Self(rug::Rational::from(value))),
Err(err) => Err(err)
}
}
}
impl Assign for Rational {
fn assign(&mut self, src: Self) { self.0.assign(src.0) }
}
impl Assign<&Rational> for Rational {
fn assign(&mut self, src: &Rational) { self.0.assign(&src.0) }
}
impl Clone for Rational {
fn clone(&self) -> Self { Self(self.0.clone()) }
}
impl fmt::Display for Rational {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if let Some(precision) = f.precision() {
if precision == 0 {
let result = rug::Integer::from((&self.0).round_ref()).to_string();
return f.write_str(&result);
} else {
let base = rug::Rational::from(10).pow(precision as u32);
let mut result = rug::Integer::from((&self.0 * base).round_ref()).to_string();
// Add leading 0s
result = format!("{0:0>1$}", result, precision + 1);
// Add the decimal point
result.insert(result.len() - precision, '.');
return f.write_str(&result);
}
} else {
return self.0.fmt(f);
}
}
}
impl One for Rational {
fn one() -> Self { Rational(rug::Rational::from(1)) }
}
impl Zero for Rational {
fn zero() -> Self { Self::new() }
fn is_zero(&self) -> bool { self.0 == rug::Rational::new() }
}
impl PartialEq for Rational {
fn eq(&self, _other: &Self) -> bool {
todo!()
}
}
impl PartialOrd for Rational {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> { self.0.partial_cmp(&other.0) }
}
impl ops::Neg for Rational {
type Output = Rational;
fn neg(self) -> Self::Output { Rational(-self.0) }
}
impl ops::Add for Rational {
type Output = Rational;
fn add(self, _rhs: Self) -> Self::Output {
todo!()
}
}
impl ops::Sub for Rational {
type Output = Rational;
fn sub(self, _rhs: Self) -> Self::Output {
todo!()
}
}
impl ops::Mul for Rational {
type Output = Rational;
fn mul(self, _rhs: Self) -> Self::Output {
todo!()
}
}
impl ops::Div for Rational {
type Output = Rational;
fn div(self, _rhs: Self) -> Self::Output {
todo!()
}
}
impl ops::Rem for Rational {
type Output = Rational;
fn rem(self, _rhs: Self) -> Self::Output {
todo!()
}
}
impl ops::Add<&Rational> for Rational {
type Output = Rational;
fn add(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
impl ops::Sub<&Rational> for Rational {
type Output = Rational;
fn sub(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
impl ops::Mul<&Rational> for Rational {
type Output = Rational;
fn mul(self, rhs: &Rational) -> Self::Output { Rational(self.0 * &rhs.0) }
}
impl ops::Div<&Rational> for Rational {
type Output = Rational;
fn div(self, rhs: &Rational) -> Self::Output { Rational(self.0 / &rhs.0) }
}
impl ops::Rem<&Rational> for Rational {
type Output = Rational;
fn rem(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
impl ops::AddAssign for Rational {
fn add_assign(&mut self, rhs: Self) { self.0 += rhs.0 }
}
impl ops::SubAssign for Rational {
fn sub_assign(&mut self, _rhs: Self) {
todo!()
}
}
impl ops::MulAssign for Rational {
fn mul_assign(&mut self, _rhs: Self) {
todo!()
}
}
impl ops::DivAssign for Rational {
fn div_assign(&mut self, rhs: Self) {
self.0 /= &rhs.0;
}
}
impl ops::RemAssign for Rational {
fn rem_assign(&mut self, _rhs: Self) {
todo!()
}
}
impl ops::AddAssign<&Rational> for Rational {
fn add_assign(&mut self, rhs: &Rational) {
self.0 += &rhs.0;
}
}
impl ops::SubAssign<&Rational> for Rational {
fn sub_assign(&mut self, _rhs: &Rational) {
todo!()
}
}
impl ops::MulAssign<&Rational> for Rational {
fn mul_assign(&mut self, _rhs: &Rational) {
todo!()
}
}
impl ops::DivAssign<&Rational> for Rational {
fn div_assign(&mut self, _rhs: &Rational) {
todo!()
}
}
impl ops::RemAssign<&Rational> for Rational {
fn rem_assign(&mut self, _rhs: &Rational) {
todo!()
}
}
impl ops::Add<&Rational> for &Rational {
type Output = Rational;
fn add(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
impl ops::Sub<&Rational> for &Rational {
type Output = Rational;
fn sub(self, rhs: &Rational) -> Self::Output {
return Rational(rug::Rational::from(&self.0 - &rhs.0));
}
}
impl ops::Mul<&Rational> for &Rational {
type Output = Rational;
fn mul(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
impl ops::Div<&Rational> for &Rational {
type Output = Rational;
fn div(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
impl ops::Rem<&Rational> for &Rational {
type Output = Rational;
fn rem(self, _rhs: &Rational) -> Self::Output {
todo!()
}
}
/*
impl ops::Add<&&Rational> for &Rational {
}
impl ops::Sub<&&Rational> for &Rational {
}
impl ops::Mul<&&Rational> for &Rational {
}
impl ops::Div<&&Rational> for &Rational {
}
impl ops::Rem<&&Rational> for &Rational {
}
*/
pub type NumType = Rational;

327
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/* OpenTally: Open-source election vote counting
* Copyright © 2021 Lee Yingtong Li (RunasSudo)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#![allow(mutable_borrow_reservation_conflict)]
use crate::numbers::Number;
use crate::election::{Candidate, CandidateState, CountCard, CountState, Parcel, Vote};
use std::collections::HashMap;
use std::ops::Sub;
struct NextPreferencesResult<'a, N> {
candidates: HashMap<&'a Candidate, NextPreferencesEntry<'a, N>>,
exhausted: NextPreferencesEntry<'a, N>,
total_ballots: N,
}
struct NextPreferencesEntry<'a, N> {
//count_card: Option<&'a CountCard<'a, N>>,
votes: Vec<Vote<'a, N>>,
num_ballots: N,
num_votes: N,
}
fn next_preferences<'a, N: Number>(state: &CountState<'a, N>, votes: Vec<Vote<'a, N>>) -> NextPreferencesResult<'a, N> {
let mut result = NextPreferencesResult {
candidates: HashMap::new(),
exhausted: NextPreferencesEntry {
votes: Vec::new(),
num_ballots: N::new(),
num_votes: N::new(),
},
total_ballots: N::new(),
};
for mut vote in votes.into_iter() {
result.total_ballots += &vote.ballot.orig_value;
let mut next_candidate = None;
for (i, preference) in vote.ballot.preferences.iter().enumerate().skip(vote.up_to_pref) {
let candidate = &state.election.candidates[*preference];
let count_card = state.candidates.get(candidate).unwrap();
if let CandidateState::HOPEFUL | CandidateState::GUARDED = count_card.state {
next_candidate = Some(candidate);
vote.up_to_pref = i + 1;
break;
}
}
// Have to structure like this to satisfy Rust's borrow checker
if let Some(candidate) = next_candidate {
if result.candidates.contains_key(candidate) {
let entry = result.candidates.get_mut(candidate).unwrap();
entry.num_ballots += &vote.ballot.orig_value;
entry.num_votes += &vote.value;
entry.votes.push(vote);
} else {
let entry = NextPreferencesEntry {
num_ballots: vote.ballot.orig_value.clone(),
num_votes: vote.value.clone(),
votes: vec![vote],
};
result.candidates.insert(candidate, entry);
}
} else {
result.exhausted.num_ballots += &vote.ballot.orig_value;
result.exhausted.num_votes += &vote.value;
result.exhausted.votes.push(vote);
}
}
return result;
}
pub fn distribute_first_preferences<N: Number>(state: &mut CountState<N>) {
let mut votes = Vec::new();
for ballot in state.election.ballots.iter() {
let vote = Vote {
ballot: ballot,
value: ballot.orig_value.clone(),
up_to_pref: 0,
};
votes.push(vote);
}
let result = next_preferences(state, votes);
// Transfer candidate votes
for (candidate, entry) in result.candidates.into_iter() {
let parcel = entry.votes as Parcel<N>;
let count_card = state.candidates.get_mut(candidate).unwrap();
count_card.parcels.push(parcel);
count_card.transfer(&entry.num_votes);
}
// Transfer exhausted votes
let parcel = result.exhausted.votes as Parcel<N>;
state.exhausted.parcels.push(parcel);
state.exhausted.transfer(&result.exhausted.num_votes);
}
pub fn calculate_quota<N: Number>(state: &mut CountState<N>) {
// Calculate the total vote
state.quota = N::zero();
for count_card in state.candidates.values() {
state.quota += &count_card.votes;
}
// TODO: Different quotas
state.quota /= N::from(state.election.seats + 1);
// TODO: Different rounding rules
state.quota += N::one();
state.quota.floor_mut();
}
fn meets_quota<N: Number>(quota: &N, count_card: &CountCard<N>) -> bool {
// TODO: Different quota rules
return count_card.votes >= *quota;
}
pub fn elect_meeting_quota<N: Number>(state: &mut CountState<N>) {
// Can't use filter(...) magic because of conflict with borrow checker
let mut cands_meeting_quota = Vec::new();
for (candidate, count_card) in state.candidates.iter_mut() {
if count_card.state == CandidateState::HOPEFUL && meets_quota(&state.quota, count_card) {
cands_meeting_quota.push((candidate, count_card));
}
}
if cands_meeting_quota.len() > 0 {
// Sort by votes
cands_meeting_quota.sort_unstable_by(|a, b| a.1.votes.partial_cmp(&b.1.votes).unwrap());
// Declare elected in descending order of votes
for (_, count_card) in cands_meeting_quota.into_iter().rev() {
// TODO: Log
count_card.state = CandidateState::ELECTED;
state.num_elected += 1;
count_card.order_elected = state.num_elected as isize;
}
}
}
pub fn distribute_surpluses<N: Number>(state: &mut CountState<N>) -> bool where for<'r> &'r N: Sub<&'r N, Output=N> {
// As above regarding filter(...)
let mut has_surplus = Vec::new();
for (candidate, count_card) in state.candidates.iter() {
if count_card.votes > state.quota {
has_surplus.push((candidate, count_card));
}
}
if has_surplus.len() > 0 {
// TODO: Different sorting orders
has_surplus.sort_unstable_by(|a, b| a.1.order_elected.partial_cmp(&b.1.order_elected).unwrap());
// Distribute top candidate's surplus
// TODO: Handle ties
let elected_candidate = has_surplus.first_mut().unwrap().0;
distribute_surplus(state, elected_candidate);
return true;
}
return false;
}
fn distribute_surplus<N: Number>(state: &mut CountState<N>, elected_candidate: &Candidate) where for<'r> &'r N: Sub<&'r N, Output=N> {
let count_card = state.candidates.get(elected_candidate).unwrap();
let surplus = &count_card.votes - &state.quota;
// Inclusive Gregory
// TODO: Other methods
let votes = state.candidates.get(elected_candidate).unwrap().parcels.concat();
// Count next preferences
let result = next_preferences(state, votes);
// Transfer candidate votes
// Unweighted inclusive Gregory
// TODO: Other methods
let transfer_value = surplus.clone() / &result.total_ballots;
for (candidate, entry) in result.candidates.into_iter() {
let mut parcel = entry.votes as Parcel<N>;
// Reweight votes
for vote in parcel.iter_mut() {
vote.value = vote.ballot.orig_value.clone() * &transfer_value;
}
let count_card = state.candidates.get_mut(candidate).unwrap();
count_card.parcels.push(parcel);
let mut total_transferred = entry.num_ballots * &surplus / &result.total_ballots;
// Round transfers
// TODO: Make configurable
total_transferred.floor_mut();
count_card.transfer(&total_transferred);
}
// Transfer exhausted votes
let parcel = result.exhausted.votes as Parcel<N>;
state.exhausted.parcels.push(parcel);
state.exhausted.transfer(&result.exhausted.num_votes);
// Finalise candidate votes
let count_card = state.candidates.get_mut(elected_candidate).unwrap();
count_card.transfers = -surplus;
count_card.votes.assign(&state.quota);
}
pub fn bulk_elect<N: Number>(state: &mut CountState<N>) -> bool {
if state.election.candidates.len() - state.num_excluded <= state.election.seats {
// Bulk elect all remaining candidates
let mut hopefuls = Vec::new();
for (candidate, count_card) in state.candidates.iter_mut() {
if count_card.state == CandidateState::HOPEFUL {
hopefuls.push((candidate, count_card));
}
}
// TODO: Handle ties
hopefuls.sort_unstable_by(|a, b| a.1.votes.partial_cmp(&b.1.votes).unwrap());
for (_, count_card) in hopefuls.into_iter() {
count_card.state = CandidateState::ELECTED;
state.num_elected += 1;
count_card.order_elected = state.num_elected as isize;
}
return true;
}
return false;
}
pub fn exclude_hopefuls<N: Number>(state: &mut CountState<N>) -> bool {
let mut hopefuls = Vec::new();
for (candidate, count_card) in state.candidates.iter() {
if count_card.state == CandidateState::HOPEFUL {
hopefuls.push((candidate, count_card));
}
}
// Sort by votes
// TODO: Handle ties
hopefuls.sort_unstable_by(|a, b| a.1.votes.partial_cmp(&b.1.votes).unwrap());
// Exclude lowest ranked candidate
let excluded_candidate = hopefuls.first().unwrap().0;
exclude_candidate(state, excluded_candidate);
return true;
}
pub fn continue_exclusion<N: Number>(state: &mut CountState<N>) -> bool {
let mut excluded_with_votes = Vec::new();
for (candidate, count_card) in state.candidates.iter() {
if count_card.state == CandidateState::EXCLUDED && !count_card.votes.is_zero() {
excluded_with_votes.push((candidate, count_card));
}
}
if excluded_with_votes.len() > 0 {
excluded_with_votes.sort_unstable_by(|a, b| a.1.order_elected.partial_cmp(&b.1.order_elected).unwrap());
let excluded_candidate = excluded_with_votes.first().unwrap().0;
exclude_candidate(state, excluded_candidate);
return true;
}
return false;
}
fn exclude_candidate<N: Number>(state: &mut CountState<N>, excluded_candidate: &Candidate) {
let count_card = state.candidates.get_mut(excluded_candidate).unwrap();
count_card.state = CandidateState::EXCLUDED;
state.num_excluded += 1;
count_card.order_elected = -(state.num_excluded as isize);
// Exclude in one round
// TODO: Exclude by parcel
let votes = state.candidates.get(excluded_candidate).unwrap().parcels.concat();
// Count next preferences
let result = next_preferences(state, votes);
// Transfer candidate votes
for (candidate, entry) in result.candidates.into_iter() {
let parcel = entry.votes as Parcel<N>;
let count_card = state.candidates.get_mut(candidate).unwrap();
count_card.parcels.push(parcel);
count_card.transfer(&entry.num_votes);
}
// Transfer exhausted votes
let parcel = result.exhausted.votes as Parcel<N>;
state.exhausted.parcels.push(parcel);
state.exhausted.transfer(&result.exhausted.num_votes);
// Finalise candidate votes
let count_card = state.candidates.get_mut(excluded_candidate).unwrap();
count_card.transfers = -count_card.votes.clone();
count_card.votes = N::new();
}
pub fn finished_before_stage<N: Number>(state: &CountState<N>) -> bool {
if state.num_elected >= state.election.seats {
return true;
}
return false;
}