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Add multi-condition rewrites #351

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99 changes: 99 additions & 0 deletions src/rewrite.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -538,6 +538,105 @@ where
}
}

#[derive(Clone)]
pub struct AndCondition<L, N>
where
L: Language,
N: Analysis<L>,
{
pub c1: Arc<dyn Condition<L, N> + Send + Sync>,
pub c2: Arc<dyn Condition<L, N> + Send + Sync>,
}

impl<L: Language, N: Analysis<L>> Condition<L, N> for AndCondition<L, N> {
#[inline]
fn check(&self, egraph: &mut EGraph<L, N>, id: Id, subst: &Subst) -> bool {
self.c1.check(egraph, id, subst) && self.c2.check(egraph, id, subst)
}
fn vars(&self) -> Vec<Var> {
let mut vars = self.c1.vars();
vars.extend(self.c2.vars());
vars
}
}

#[derive(Clone)]
pub struct OrCondition<L, N>
where
L: Language,
N: Analysis<L>,
{
pub c1: Arc<dyn Condition<L, N> + Send + Sync>,
pub c2: Arc<dyn Condition<L, N> + Send + Sync>,
}

impl<L: Language, N: Analysis<L>> Condition<L, N> for OrCondition<L, N> {
#[inline]
fn check(&self, egraph: &mut EGraph<L, N>, id: Id, subst: &Subst) -> bool {
self.c1.check(egraph, id, subst) || self.c2.check(egraph, id, subst)
}
fn vars(&self) -> Vec<Var> {
let mut vars = self.c1.vars();
vars.extend(self.c2.vars());
vars
}
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TrueCondition {}

impl<L: Language, N: Analysis<L>> Condition<L, N> for TrueCondition {
#[inline(always)]
fn check(&self, _egraph: &mut EGraph<L, N>, _id: Id, _subst: &Subst) -> bool {
true
}
#[inline(always)]
fn vars(&self) -> Vec<Var> {
vec![]
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct FalseCondition {}

impl<L: Language, N: Analysis<L>> Condition<L, N> for FalseCondition {
#[inline(always)]
fn check(&self, _egraph: &mut EGraph<L, N>, _id: Id, _subst: &Subst) -> bool {
false
}
#[inline(always)]
fn vars(&self) -> Vec<Var> {
vec![]
}
}

pub fn any<L, N>(
conds: Vec<Arc<dyn Condition<L, N> + Send + Sync>>,
) -> Arc<dyn Condition<L, N> + Send + Sync>
where
L: Language + 'static,
N: Analysis<L> + 'static,
{
conds
.into_iter()
.fold(Arc::new(FalseCondition {}), |acc, c| {
Arc::new(OrCondition { c1: acc, c2: c })
})
}

pub fn all<L, N>(
conds: Vec<Arc<dyn Condition<L, N> + Send + Sync>>,
) -> Arc<dyn Condition<L, N> + Send + Sync>
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Contributor Author

@adrianleh adrianleh Mar 7, 2025

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We could also easily change the return type here into Arc<AndCondition<L,N>> if we wanted to (same for any with OrCondition) by making the base an and of true conditions. Little less efficient but nicer types

where
L: Language + 'static,
N: Analysis<L> + 'static,
{
conds
.into_iter()
.fold(Arc::new(TrueCondition {}), |acc, c| {
Arc::new(AndCondition { c1: acc, c2: c })
})
}

#[cfg(test)]
mod tests {

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