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use std::collections::BTreeMap;
use crate::*;
pub trait ExprVisitor<'a, SE1, SE2, L1, L2, N1, N2, E1, E2>: Sized {
type Error;
fn visit_subexpr(&mut self, subexpr: &'a SE1) -> Result<SE2, Self::Error>;
fn visit_label(&mut self, label: &'a L1) -> Result<L2, Self::Error>;
fn visit_note(self, note: &'a N1) -> Result<N2, Self::Error>;
fn visit_embed(self, embed: &'a E1) -> Result<E2, Self::Error>;
fn visit_subexpr_under_binder(
mut self,
_label: &'a L1,
subexpr: &'a SE1,
) -> Result<SE2, Self::Error> {
self.visit_subexpr(subexpr)
}
fn visit_binder(
mut self,
label: &'a L1,
subexpr: &'a SE1,
) -> Result<(L2, SE2), Self::Error> {
Ok((
self.visit_label(label)?,
self.visit_subexpr_under_binder(label, subexpr)?,
))
}
fn visit_embed_squash(
self,
embed: &'a E1,
) -> Result<ExprF<SE2, L2, N2, E2>, Self::Error> {
Ok(ExprF::Embed(self.visit_embed(embed)?))
}
fn visit_note_squash(
mut self,
note: &'a N1,
subexpr: &'a SE1,
) -> Result<ExprF<SE2, L2, N2, E2>, Self::Error> {
let subexpr = self.visit_subexpr(subexpr)?;
let note = self.visit_note(note)?;
Ok(ExprF::Note(note, subexpr))
}
}
impl<SE, L, N, E> ExprF<SE, L, N, E> {
pub fn visit<'a, V, SE2, L2, N2, E2>(
&'a self,
mut v: V,
) -> Result<ExprF<SE2, L2, N2, E2>, V::Error>
where
L: Ord,
L2: Ord,
V: ExprVisitor<'a, SE, SE2, L, L2, N, N2, E, E2>,
{
fn vec<'a, T, U, Err, F: FnMut(&'a T) -> Result<U, Err>>(
x: &'a Vec<T>,
f: F,
) -> Result<Vec<U>, Err> {
x.iter().map(f).collect()
}
fn opt<'a, T, U, Err, F: FnOnce(&'a T) -> Result<U, Err>>(
x: &'a Option<T>,
f: F,
) -> Result<Option<U>, Err> {
Ok(match x {
Some(x) => Some(f(x)?),
None => None,
})
}
fn btmap<'a, V, SE, L, N, E, SE2, L2, N2, E2>(
x: &'a BTreeMap<L, SE>,
mut v: V,
) -> Result<BTreeMap<L2, SE2>, V::Error>
where
L: Ord,
L2: Ord,
V: ExprVisitor<'a, SE, SE2, L, L2, N, N2, E, E2>,
{
x.into_iter()
.map(|(k, x)| Ok((v.visit_label(k)?, v.visit_subexpr(x)?)))
.collect()
}
use crate::ExprF::*;
Ok(match self {
Var(V(l, n)) => Var(V(v.visit_label(l)?, *n)),
Lam(l, t, e) => {
let t = v.visit_subexpr(t)?;
let (l, e) = v.visit_binder(l, e)?;
Lam(l, t, e)
}
Pi(l, t, e) => {
let t = v.visit_subexpr(t)?;
let (l, e) = v.visit_binder(l, e)?;
Pi(l, t, e)
}
Let(l, t, a, e) => {
let t = opt(t, &mut |e| v.visit_subexpr(e))?;
let a = v.visit_subexpr(a)?;
let (l, e) = v.visit_binder(l, e)?;
Let(l, t, a, e)
}
App(f, args) => {
App(v.visit_subexpr(f)?, vec(args, |e| v.visit_subexpr(e))?)
}
Annot(x, t) => Annot(v.visit_subexpr(x)?, v.visit_subexpr(t)?),
Const(k) => Const(*k),
Builtin(v) => Builtin(*v),
BoolLit(b) => BoolLit(*b),
NaturalLit(n) => NaturalLit(*n),
IntegerLit(n) => IntegerLit(*n),
DoubleLit(n) => DoubleLit(*n),
TextLit(t) => TextLit(t.traverse_ref(|e| v.visit_subexpr(e))?),
BinOp(o, x, y) => {
BinOp(*o, v.visit_subexpr(x)?, v.visit_subexpr(y)?)
}
BoolIf(b, t, f) => BoolIf(
v.visit_subexpr(b)?,
v.visit_subexpr(t)?,
v.visit_subexpr(f)?,
),
EmptyListLit(t) => EmptyListLit(v.visit_subexpr(t)?),
NEListLit(es) => NEListLit(vec(es, |e| v.visit_subexpr(e))?),
EmptyOptionalLit(t) => EmptyOptionalLit(v.visit_subexpr(t)?),
NEOptionalLit(e) => NEOptionalLit(v.visit_subexpr(e)?),
RecordType(kts) => RecordType(btmap(kts, v)?),
RecordLit(kvs) => RecordLit(btmap(kvs, v)?),
UnionType(kts) => UnionType(btmap(kts, v)?),
UnionLit(k, x, kvs) => {
UnionLit(v.visit_label(k)?, v.visit_subexpr(x)?, btmap(kvs, v)?)
}
Merge(x, y, t) => Merge(
v.visit_subexpr(x)?,
v.visit_subexpr(y)?,
opt(t, |e| v.visit_subexpr(e))?,
),
Field(e, l) => Field(v.visit_subexpr(e)?, v.visit_label(l)?),
Projection(e, ls) => {
Projection(v.visit_subexpr(e)?, vec(ls, |l| v.visit_label(l))?)
}
Note(n, e) => v.visit_note_squash(n, e)?,
Embed(a) => v.visit_embed_squash(a)?,
})
}
}
pub struct TraverseRefVisitor<F1, F2, F3, F4, F5> {
pub visit_subexpr: F1,
pub visit_under_binder: F2,
pub visit_note: F3,
pub visit_embed: F4,
pub visit_label: F5,
}
impl<'a, SE, L, N, E, SE2, L2, N2, E2, Err, F1, F2, F3, F4, F5>
ExprVisitor<'a, SE, SE2, L, L2, N, N2, E, E2>
for TraverseRefVisitor<F1, F2, F3, F4, F5>
where
SE: 'a,
L: 'a,
N: 'a,
E: 'a,
L: Ord,
L2: Ord,
F1: FnMut(&'a SE) -> Result<SE2, Err>,
F2: FnOnce(&'a L, &'a SE) -> Result<SE2, Err>,
F3: FnOnce(&'a N) -> Result<N2, Err>,
F4: FnOnce(&'a E) -> Result<E2, Err>,
F5: FnMut(&'a L) -> Result<L2, Err>,
{
type Error = Err;
fn visit_subexpr(&mut self, subexpr: &'a SE) -> Result<SE2, Self::Error> {
(self.visit_subexpr)(subexpr)
}
fn visit_subexpr_under_binder(
self,
label: &'a L,
subexpr: &'a SE,
) -> Result<SE2, Self::Error> {
(self.visit_under_binder)(label, subexpr)
}
fn visit_note(self, note: &'a N) -> Result<N2, Self::Error> {
(self.visit_note)(note)
}
fn visit_embed(self, embed: &'a E) -> Result<E2, Self::Error> {
(self.visit_embed)(embed)
}
fn visit_label(&mut self, label: &'a L) -> Result<L2, Self::Error> {
(self.visit_label)(label)
}
}
pub struct TraverseRefSimpleVisitor<F1> {
pub visit_subexpr: F1,
}
impl<'a, SE, L, N, E, SE2, Err, F1> ExprVisitor<'a, SE, SE2, L, L, N, N, E, E>
for TraverseRefSimpleVisitor<F1>
where
SE: 'a,
L: Ord + Clone + 'a,
N: Clone + 'a,
E: Clone + 'a,
F1: FnMut(&'a SE) -> Result<SE2, Err>,
{
type Error = Err;
fn visit_subexpr(&mut self, subexpr: &'a SE) -> Result<SE2, Self::Error> {
(self.visit_subexpr)(subexpr)
}
fn visit_note(self, note: &'a N) -> Result<N, Self::Error> {
Ok(N::clone(note))
}
fn visit_embed(self, embed: &'a E) -> Result<E, Self::Error> {
Ok(E::clone(embed))
}
fn visit_label(&mut self, label: &'a L) -> Result<L, Self::Error> {
Ok(L::clone(label))
}
}
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