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Update quota/VRE in certain rare cases

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This commit is contained in:
RunasSudo 2021-09-10 01:42:42 +10:00
parent de19324d2c
commit c9b189fefe
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1 changed files with 52 additions and 37 deletions
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89
src/stv/mod.rs
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@ -840,6 +840,44 @@ fn update_vre_ers<N: Number>(state: &mut CountState<N>, opts: &STVOptions) {
}
}
/// Update vote required for election if only one candidate remains, used in early bulk election
///
/// Assumes early bulk election is enabled.
fn update_vre_bulk<N: Number>(state: &mut CountState<N>, _opts: &STVOptions) {
// If --early-bulk-elect and one candidate remains, VRE is half of the active vote
// For display purposes only
if state.election.seats - state.num_elected == 1 {
//let mut log = String::new();
// Calculate active vote
let active_vote = state.candidates.values().fold(N::zero(), |acc, cc| {
match cc.state {
CandidateState::Elected => { if !cc.finalised && &cc.votes > state.quota.as_ref().unwrap() { acc + &cc.votes - state.quota.as_ref().unwrap() } else { acc } }
_ => { acc + &cc.votes }
}
});
//log.push_str(format!("Active vote is {:.dps$}, so the vote required for election is ", active_vote, dps=opts.pp_decimals).as_str());
let vote_req = active_vote / N::from(state.election.seats - state.num_elected + 1);
if &vote_req < state.quota.as_ref().unwrap() {
// VRE is less than the quota
//if let Some(v) = &state.vote_required_election {
// if &vote_req != v {
//log.push_str(format!("{:.dps$}.", vote_req, dps=opts.pp_decimals).as_str());
state.vote_required_election = Some(vote_req);
//state.logger.log_literal(log);
// }
//} else {
//log.push_str(format!("{:.dps$}.", vote_req, dps=opts.pp_decimals).as_str());
// state.vote_required_election = Some(vote_req);
//state.logger.log_literal(log);
//}
}
}
}
/// Calculate the quota according to [STVOptions::quota]
fn calculate_quota<N: Number>(state: &mut CountState<N>, opts: &STVOptions) {
if state.quota.is_none() || opts.quota_mode == QuotaMode::DynamicByTotal {
@ -910,36 +948,8 @@ fn calculate_quota<N: Number>(state: &mut CountState<N>, opts: &STVOptions) {
} else {
// No ERS97/ERS76 rules
// If --early-bulk-elect and one candidate remains, VRE is half of the active vote
// For display purposes only
if opts.early_bulk_elect && (state.election.seats - state.num_elected) == 1 {
//let mut log = String::new();
// Calculate active vote
let active_vote = state.candidates.values().fold(N::zero(), |acc, cc| {
match cc.state {
CandidateState::Elected => { if !cc.finalised && &cc.votes > state.quota.as_ref().unwrap() { acc + &cc.votes - state.quota.as_ref().unwrap() } else { acc } }
_ => { acc + &cc.votes }
}
});
//log.push_str(format!("Active vote is {:.dps$}, so the vote required for election is ", active_vote, dps=opts.pp_decimals).as_str());
let vote_req = active_vote / N::from(state.election.seats - state.num_elected + 1);
if &vote_req < state.quota.as_ref().unwrap() {
// VRE is less than the quota
//if let Some(v) = &state.vote_required_election {
// if &vote_req != v {
//log.push_str(format!("{:.dps$}.", vote_req, dps=opts.pp_decimals).as_str());
state.vote_required_election = Some(vote_req);
//state.logger.log_literal(log);
// }
//} else {
//log.push_str(format!("{:.dps$}.", vote_req, dps=opts.pp_decimals).as_str());
// state.vote_required_election = Some(vote_req);
//state.logger.log_literal(log);
//}
}
if opts.early_bulk_elect {
update_vre_bulk(state, opts);
}
}
}
@ -1119,17 +1129,22 @@ fn elect_hopefuls<'a, N: Number>(state: &mut CountState<'a, N>, opts: &STVOption
cands_meeting_quota.remove(cands_meeting_quota.iter().position(|c| *c == candidate).unwrap());
}
if opts.quota_mode == QuotaMode::ERS97 || (opts.quota_mode == QuotaMode::ERS76 && elected_on_quota) {
if opts.quota_mode == QuotaMode::ERS97 || opts.quota_mode == QuotaMode::ERS76 || opts.quota_mode == QuotaMode::DynamicByActive {
// Vote required for election may have changed
// ERS97: Check this after every elected candidate (cf. model election)
// ERS76: Check this after every candidate elected on a quota, but all at once for candidates elected on VRE (cf. model election)
calculate_quota(state, opts);
// Repeat in case vote required for election has changed
match elect_hopefuls(state, opts, true) {
Ok(_) => { break; }
Err(e) => { return Err(e); }
if opts.quota_mode == QuotaMode::ERS97 || (opts.quota_mode == QuotaMode::ERS76 && elected_on_quota) || opts.quota_mode == QuotaMode::DynamicByActive {
calculate_quota(state, opts);
// Repeat in case vote required for election has changed
match elect_hopefuls(state, opts, true) {
Ok(_) => { break; }
Err(e) => { return Err(e); }
}
}
} else if opts.early_bulk_elect {
// Vote required for election may have changed for display purposes
update_vre_bulk(state, opts);
}
}