157 lines
4.9 KiB
Rust
157 lines
4.9 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 crate::election::{Candidate, CandidateState, CountCard, CountState, CountStateOrRef, Election, StageResult};
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use crate::numbers::{NativeFloat64, Number};
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use crate::stv;
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extern crate console_error_panic_hook;
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use wasm_bindgen::prelude::wasm_bindgen;
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// Logging
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#[wasm_bindgen]
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extern "C" {
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#[wasm_bindgen(js_namespace = console)]
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fn log(s: &str);
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}
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macro_rules! cprintln {
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($($t:tt)*) => (
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#[allow(unused_unsafe)]
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unsafe { log(&format_args!($($t)*).to_string()) }
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)
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}
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// Exported functions
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#[wasm_bindgen]
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pub fn election_from_blt_float64(text: String) -> ElectionFloat64 {
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// Install panic! hook
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console_error_panic_hook::set_once();
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let election: Election<NativeFloat64> = Election::from_blt(text.lines().map(|s| s.to_string()).into_iter());
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return ElectionFloat64(election);
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}
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#[wasm_bindgen]
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pub fn count_init_float64(state: &mut CountStateFloat64, opts: &STVOptions) {
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stv::count_init(&mut state.0, &opts.0);
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}
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#[wasm_bindgen]
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pub fn count_one_stage_float64(state: &mut CountStateFloat64, opts: &STVOptions) -> bool {
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return stv::count_one_stage(&mut state.0, &opts.0);
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}
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// Reporting
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fn print_candidates<'a, N: 'a + Number, I: Iterator<Item=(&'a Candidate, &'a CountCard<'a, N>)>>(candidates: I) {
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for (candidate, count_card) in candidates {
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if count_card.state == CandidateState::ELECTED {
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cprintln!("- {}: {:.dps$} ({:.dps$}) - ELECTED {}", candidate.name, count_card.votes, count_card.transfers, count_card.order_elected, dps=2);
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} else if count_card.state == CandidateState::EXCLUDED {
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cprintln!("- {}: {:.dps$} ({:.dps$}) - Excluded {}", candidate.name, count_card.votes, count_card.transfers, -count_card.order_elected, dps=2);
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} else {
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cprintln!("- {}: {:.dps$} ({:.dps$})", candidate.name, count_card.votes, count_card.transfers, dps=2);
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}
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}
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}
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fn print_stage<N: Number>(stage_num: usize, result: &StageResult<N>) {
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// Print stage details
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match result.kind {
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None => { cprintln!("{}. {}", stage_num, result.title); }
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Some(kind) => { cprintln!("{}. {} {}", stage_num, kind, result.title); }
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};
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cprintln!("{}", result.logs.join(" "));
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let state = result.state.as_ref();
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// Print candidates
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let candidates = state.election.candidates.iter()
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.map(|c| (c, state.candidates.get(c).unwrap()));
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print_candidates(candidates);
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// Print summary rows
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cprintln!("Exhausted: {:.dps$} ({:.dps$})", state.exhausted.votes, state.exhausted.transfers, dps=2);
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cprintln!("Loss by fraction: {:.dps$} ({:.dps$})", state.loss_fraction.votes, state.loss_fraction.transfers, dps=2);
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let mut total_vote = state.candidates.values().fold(N::zero(), |acc, cc| { acc + &cc.votes });
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total_vote += &state.exhausted.votes;
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total_vote += &state.loss_fraction.votes;
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cprintln!("Total votes: {:.dps$}", total_vote, dps=2);
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cprintln!("Quota: {:.dps$}", state.quota, dps=2);
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cprintln!("");
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}
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#[wasm_bindgen]
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pub fn make_and_print_result_float64(stage_num: usize, state: &CountStateFloat64) {
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let result = StageResult {
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kind: state.0.kind,
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title: &state.0.title,
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logs: state.0.logger.render(),
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state: CountStateOrRef::from(&state.0),
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};
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print_stage(stage_num, &result);
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}
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// Wrapper structs
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// Required as we cannot specify &'static in wasm-bindgen: issue #1187
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#[wasm_bindgen]
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pub struct CountStateFloat64(CountState<'static, NativeFloat64>);
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#[wasm_bindgen]
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impl CountStateFloat64 {
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pub fn new(election: &ElectionFloat64) -> Self {
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return CountStateFloat64(CountState::new(election.as_static()));
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}
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}
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#[wasm_bindgen]
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pub struct ElectionFloat64(Election<NativeFloat64>);
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#[wasm_bindgen]
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impl ElectionFloat64 {
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pub fn seats(&self) -> usize { self.0.seats }
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fn as_static(&self) -> &'static Election<NativeFloat64> {
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// Need to have this as we cannot specify &'static in wasm-bindgen: issue #1187
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unsafe {
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let ptr = &self.0 as *const Election<NativeFloat64>;
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&*ptr
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}
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}
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}
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#[wasm_bindgen]
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pub struct STVOptions(stv::STVOptions<'static>);
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#[wasm_bindgen]
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impl STVOptions {
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pub fn new(round_votes: Option<usize>, exclusion: String) -> Self {
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if exclusion == "one_round" {
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return STVOptions(stv::STVOptions {
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round_votes: round_votes,
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exclusion: &"one_round",
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});
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} else {
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panic!("Unknown --exclusion");
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}
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}
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}
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