118 lines
4.3 KiB
Rust
118 lines
4.3 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 opentally::election::{CandidateState, CountState, Election};
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use opentally::numbers::{Number, Rational};
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use opentally::stv;
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use csv::StringRecord;
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use std::fs::File;
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use std::io::{self, BufRead};
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use std::ops;
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#[allow(dead_code)] // Suppress false positive
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pub fn read_validate_election<N: Number>(csv_file: &str, blt_file: &str, stv_opts: stv::STVOptions) {
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// Read CSV file
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let reader = csv::ReaderBuilder::new()
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.has_headers(false)
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.from_path(csv_file)
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.expect("IO Error");
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let records: Vec<StringRecord> = reader.into_records().map(|r| r.expect("Syntax Error")).collect();
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let mut candidates: Vec<&str> = records.iter().skip(2).map(|r| &r[0]).collect();
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// Remove exhausted/LBF rows
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candidates.truncate(candidates.len() - 2);
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// TODO: Validate candidate names
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let stages: Vec<usize> = records.first().unwrap().iter().skip(1).step_by(2).map(|s| s.parse().unwrap()).collect();
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// Decompress BLT
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let file = File::open(blt_file).expect("IO Error");
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let file_reader = io::BufReader::new(file);
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let lines = file_reader.lines();
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// Read BLT
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let election: Election<Rational> = Election::from_blt(lines.map(|r| r.expect("IO Error").to_string()).into_iter());
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validate_election(stages, records, election, stv_opts);
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}
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pub fn validate_election<N: Number>(stages: Vec<usize>, records: Vec<StringRecord>, election: Election<N>, stv_opts: stv::STVOptions)
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where
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for<'r> &'r N: ops::Sub<&'r N, Output=N>,
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for<'r> &'r N: ops::Div<&'r N, Output=N>,
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for<'r> &'r N: ops::Neg<Output=N>,
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{
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// Initialise count state
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let mut state = CountState::new(&election);
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// Distribute first preferences
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stv::count_init(&mut state, &stv_opts);
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let mut stage_num = 1;
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for (idx, stage) in stages.into_iter().enumerate() {
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while stage_num < stage {
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// Step through stages
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// Assert count not yet done
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assert_eq!(stv::count_one_stage(&mut state, &stv_opts), false);
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stage_num += 1;
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}
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validate_stage(idx, &state, &records);
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}
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}
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fn validate_stage<N: Number>(idx: usize, state: &CountState<N>, records: &Vec<StringRecord>) {
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println!("Col at idx {}", idx);
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let mut candidate_votes: Vec<N> = records.iter().skip(2).map(|r| N::from(r[idx*2 + 1].parse::<f64>().expect("Syntax Error"))).collect();
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// Validate exhausted/LBF
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let lbf_votes = candidate_votes.pop().unwrap();
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let exhausted_votes = candidate_votes.pop().unwrap();
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assert!(state.exhausted.votes == exhausted_votes);
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assert!(state.loss_fraction.votes == lbf_votes);
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// Remove exhausted/LBF rows
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candidate_votes.truncate(candidate_votes.len() - 2);
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// Validate candidate votes
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for (candidate, votes) in state.election.candidates.iter().zip(candidate_votes) {
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let count_card = state.candidates.get(candidate).unwrap();
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assert!(count_card.votes == votes, "Failed to validate votes for candidate {}. Expected {:}, got {:}", candidate.name, votes, count_card.votes);
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}
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// Validate candidate states
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let mut candidate_states: Vec<&str> = records.iter().skip(2).map(|r| &r[idx*2 + 2]).collect();
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candidate_states.truncate(candidate_states.len() - 2);
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for (candidate, candidate_state) in state.election.candidates.iter().zip(candidate_states) {
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let count_card = state.candidates.get(candidate).unwrap();
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if candidate_state == "" {
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assert!(count_card.state == CandidateState::HOPEFUL);
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} else if candidate_state == "EL" || candidate_state == "PEL" {
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assert!(count_card.state == CandidateState::ELECTED);
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} else if candidate_state == "EX" || candidate_state == "EXCLUDING" {
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assert!(count_card.state == CandidateState::EXCLUDED);
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} else {
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panic!("Unknown state descriptor {}", candidate_state);
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}
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}
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}
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