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//! Elimination arms for fuzzy, weighted/probabilistic, aggregation, higher-order,
//! set, counting, fixpoint, hybrid, abductive, and leaf nodes.
use tensorlogic_ir::TLExpr;
use super::types::{DceStats, DeadCodeEliminator};
impl DeadCodeEliminator {
/// Handle the remaining extended-logic arms. This is the terminal dispatch
/// step; every `TLExpr` variant that is not handled here is a leaf.
pub(super) fn elim_ext(&self, expr: TLExpr, stats: &mut DceStats) -> (TLExpr, bool) {
match expr {
TLExpr::TNorm { kind, left, right } => {
let (nl, cl) = self.eliminate(*left, stats);
let (nr, cr) = self.eliminate(*right, stats);
(
TLExpr::TNorm {
kind,
left: Box::new(nl),
right: Box::new(nr),
},
cl || cr,
)
}
TLExpr::TCoNorm { kind, left, right } => {
let (nl, cl) = self.eliminate(*left, stats);
let (nr, cr) = self.eliminate(*right, stats);
(
TLExpr::TCoNorm {
kind,
left: Box::new(nl),
right: Box::new(nr),
},
cl || cr,
)
}
TLExpr::FuzzyNot { kind, expr } => {
let (ne, changed) = self.eliminate(*expr, stats);
(
TLExpr::FuzzyNot {
kind,
expr: Box::new(ne),
},
changed,
)
}
TLExpr::FuzzyImplication {
kind,
premise,
conclusion,
} => {
let (np, cp) = self.eliminate(*premise, stats);
let (nc, cc) = self.eliminate(*conclusion, stats);
(
TLExpr::FuzzyImplication {
kind,
premise: Box::new(np),
conclusion: Box::new(nc),
},
cp || cc,
)
}
TLExpr::WeightedRule { weight, rule } => {
let (nr, changed) = self.eliminate(*rule, stats);
(
TLExpr::WeightedRule {
weight,
rule: Box::new(nr),
},
changed,
)
}
TLExpr::ProbabilisticChoice { alternatives } => {
let mut any_changed = false;
let new_alts: Vec<(f64, TLExpr)> = alternatives
.into_iter()
.map(|(prob, e)| {
let (ne, changed) = self.eliminate(e, stats);
any_changed = any_changed || changed;
(prob, ne)
})
.collect();
(
TLExpr::ProbabilisticChoice {
alternatives: new_alts,
},
any_changed,
)
}
TLExpr::Aggregate {
op,
var,
domain,
body,
group_by,
} => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::Aggregate {
op,
var,
domain,
body: Box::new(new_body),
group_by,
},
changed,
)
}
TLExpr::Lambda {
var,
var_type,
body,
} => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::Lambda {
var,
var_type,
body: Box::new(new_body),
},
changed,
)
}
TLExpr::Apply { function, argument } => {
let (nf, cf) = self.eliminate(*function, stats);
let (na, ca) = self.eliminate(*argument, stats);
(
TLExpr::Apply {
function: Box::new(nf),
argument: Box::new(na),
},
cf || ca,
)
}
TLExpr::SetMembership { element, set } => {
let (ne, ce) = self.eliminate(*element, stats);
let (ns, cs) = self.eliminate(*set, stats);
(
TLExpr::SetMembership {
element: Box::new(ne),
set: Box::new(ns),
},
ce || cs,
)
}
TLExpr::SetUnion { left, right } => {
let (nl, cl) = self.eliminate(*left, stats);
let (nr, cr) = self.eliminate(*right, stats);
(
TLExpr::SetUnion {
left: Box::new(nl),
right: Box::new(nr),
},
cl || cr,
)
}
TLExpr::SetIntersection { left, right } => {
let (nl, cl) = self.eliminate(*left, stats);
let (nr, cr) = self.eliminate(*right, stats);
(
TLExpr::SetIntersection {
left: Box::new(nl),
right: Box::new(nr),
},
cl || cr,
)
}
TLExpr::SetDifference { left, right } => {
let (nl, cl) = self.eliminate(*left, stats);
let (nr, cr) = self.eliminate(*right, stats);
(
TLExpr::SetDifference {
left: Box::new(nl),
right: Box::new(nr),
},
cl || cr,
)
}
TLExpr::SetCardinality { set } => {
let (ns, changed) = self.eliminate(*set, stats);
(TLExpr::SetCardinality { set: Box::new(ns) }, changed)
}
TLExpr::SetComprehension {
var,
domain,
condition,
} => {
let (nc, changed) = self.eliminate(*condition, stats);
(
TLExpr::SetComprehension {
var,
domain,
condition: Box::new(nc),
},
changed,
)
}
TLExpr::CountingExists {
var,
domain,
body,
min_count,
} => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::CountingExists {
var,
domain,
body: Box::new(new_body),
min_count,
},
changed,
)
}
TLExpr::CountingForAll {
var,
domain,
body,
min_count,
} => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::CountingForAll {
var,
domain,
body: Box::new(new_body),
min_count,
},
changed,
)
}
TLExpr::ExactCount {
var,
domain,
body,
count,
} => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::ExactCount {
var,
domain,
body: Box::new(new_body),
count,
},
changed,
)
}
TLExpr::Majority { var, domain, body } => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::Majority {
var,
domain,
body: Box::new(new_body),
},
changed,
)
}
TLExpr::LeastFixpoint { var, body } => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::LeastFixpoint {
var,
body: Box::new(new_body),
},
changed,
)
}
TLExpr::GreatestFixpoint { var, body } => {
let (new_body, changed) = self.eliminate(*body, stats);
(
TLExpr::GreatestFixpoint {
var,
body: Box::new(new_body),
},
changed,
)
}
TLExpr::At { nominal, formula } => {
let (nf, changed) = self.eliminate(*formula, stats);
(
TLExpr::At {
nominal,
formula: Box::new(nf),
},
changed,
)
}
TLExpr::Somewhere { formula } => {
let (nf, changed) = self.eliminate(*formula, stats);
(
TLExpr::Somewhere {
formula: Box::new(nf),
},
changed,
)
}
TLExpr::Everywhere { formula } => {
let (nf, changed) = self.eliminate(*formula, stats);
(
TLExpr::Everywhere {
formula: Box::new(nf),
},
changed,
)
}
TLExpr::Explain { formula } => {
let (nf, changed) = self.eliminate(*formula, stats);
(
TLExpr::Explain {
formula: Box::new(nf),
},
changed,
)
}
// Leaves / terminal nodes (no children to recurse into)
leaf @ (TLExpr::Pred { .. }
| TLExpr::Constant(_)
| TLExpr::EmptySet
| TLExpr::AllDifferent { .. }
| TLExpr::GlobalCardinality { .. }
| TLExpr::Nominal { .. }
| TLExpr::Abducible { .. }) => (leaf, false),
TLExpr::SymbolLiteral(_) => (expr, false),
TLExpr::Match { scrutinee, arms } => {
let (new_scrutinee, sc) = self.eliminate(*scrutinee, stats);
let mut any_changed = sc;
let new_arms = arms
.into_iter()
.map(|(pat, body)| {
let (new_body, bc) = self.eliminate(*body, stats);
if bc {
any_changed = true;
}
(pat, Box::new(new_body))
})
.collect();
(
TLExpr::Match {
scrutinee: Box::new(new_scrutinee),
arms: new_arms,
},
any_changed,
)
}
// Any remaining variant should already have been handled by
// `elim_flow` or `elim_ops` upstream — treat as an unchanged leaf
// so the match stays exhaustive and future TLExpr additions do not
// silently vanish.
other => (other, false),
}
}
}