diff options
Diffstat (limited to 'dhall_syntax')
| -rw-r--r-- | dhall_syntax/src/core/expr.rs | 102 | ||||
| -rw-r--r-- | dhall_syntax/src/core/import.rs | 34 | ||||
| -rw-r--r-- | dhall_syntax/src/core/map.rs | 65 | ||||
| -rw-r--r-- | dhall_syntax/src/core/text.rs | 10 | ||||
| -rw-r--r-- | dhall_syntax/src/core/visitor.rs | 413 |
5 files changed, 399 insertions, 225 deletions
diff --git a/dhall_syntax/src/core/expr.rs b/dhall_syntax/src/core/expr.rs index f46cafb..2cb23c9 100644 --- a/dhall_syntax/src/core/expr.rs +++ b/dhall_syntax/src/core/expr.rs @@ -1,7 +1,7 @@ use std::rc::Rc; use crate::map::{DupTreeMap, DupTreeSet}; -use crate::visitor; +use crate::visitor::{self, ExprFMutVisitor, ExprFVisitor}; use crate::*; pub type Integer = isize; @@ -256,13 +256,6 @@ pub enum ExprF<SubExpr, Embed> { } impl<SE, E> ExprF<SE, E> { - pub(crate) fn visit<'a, V, Return>(&'a self, v: V) -> Return - where - V: visitor::GenericVisitor<&'a ExprF<SE, E>, Return>, - { - v.visit(self) - } - pub fn traverse_ref_with_special_handling_of_binders<'a, SE2, Err>( &'a self, visit_subexpr: impl FnMut(&'a SE) -> Result<SE2, Err>, @@ -271,10 +264,11 @@ impl<SE, E> ExprF<SE, E> { where E: Clone, { - self.visit(visitor::TraverseRefWithBindersVisitor { + visitor::TraverseRefWithBindersVisitor { visit_subexpr, visit_under_binder, - }) + } + .visit(self) } fn traverse_ref<'a, SE2, Err>( @@ -284,7 +278,14 @@ impl<SE, E> ExprF<SE, E> { where E: Clone, { - self.visit(visitor::TraverseRefVisitor { visit_subexpr }) + visitor::TraverseRefVisitor { visit_subexpr }.visit(self) + } + + fn traverse_mut<'a, Err>( + &'a mut self, + visit_subexpr: impl FnMut(&'a mut SE) -> Result<(), Err>, + ) -> Result<(), Err> { + visitor::TraverseMutVisitor { visit_subexpr }.visit(self) } pub fn map_ref_with_special_handling_of_binders<'a, SE2>( @@ -310,42 +311,9 @@ impl<SE, E> ExprF<SE, E> { { trivial_result(self.traverse_ref(|x| Ok(map_subexpr(x)))) } -} - -impl<E> RawExpr<E> { - pub fn traverse_resolve<Err>( - &self, - visit_import: impl FnMut(&Import<Expr<E>>) -> Result<E, Err>, - ) -> Result<RawExpr<E>, Err> - where - E: Clone, - { - self.traverse_resolve_with_visitor(&mut visitor::ResolveVisitor( - visit_import, - )) - } - pub(crate) fn traverse_resolve_with_visitor<Err, F1>( - &self, - visitor: &mut visitor::ResolveVisitor<F1>, - ) -> Result<RawExpr<E>, Err> - where - E: Clone, - F1: FnMut(&Import<Expr<E>>) -> Result<E, Err>, - { - match self { - ExprF::BinOp(BinOp::ImportAlt, l, r) => l - .as_ref() - .traverse_resolve_with_visitor(visitor) - .or_else(|_| r.as_ref().traverse_resolve_with_visitor(visitor)), - _ => { - let e = self.visit(&mut *visitor)?; - Ok(match &e { - ExprF::Import(import) => ExprF::Embed((visitor.0)(import)?), - _ => e, - }) - } - } + pub fn map_mut<'a>(&'a mut self, mut map_subexpr: impl FnMut(&'a mut SE)) { + trivial_result(self.traverse_mut(|x| Ok(map_subexpr(x)))) } } @@ -353,6 +321,9 @@ impl<E> Expr<E> { pub fn as_ref(&self) -> &RawExpr<E> { &self.0.as_ref().0 } + pub fn as_mut(&mut self) -> &mut RawExpr<E> { + &mut self.0.as_mut().0 + } pub fn new(x: RawExpr<E>, n: Span) -> Self { Expr(Box::new((x, Some(n)))) @@ -369,17 +340,42 @@ impl<E> Expr<E> { pub fn rewrap<E2>(&self, x: RawExpr<E2>) -> Expr<E2> { Expr(Box::new((x, (self.0).1.clone()))) } -} -impl<E> Expr<E> { - pub fn traverse_resolve<Err>( - &self, - visit_import: impl FnMut(&Import<Expr<E>>) -> Result<E, Err>, - ) -> Result<Expr<E>, Err> + pub fn traverse_resolve_mut<Err, F1>( + &mut self, + f: &mut F1, + ) -> Result<(), Err> where E: Clone, + F1: FnMut(Import<Expr<E>>) -> Result<E, Err>, { - Ok(self.rewrap(self.as_ref().traverse_resolve(visit_import)?)) + match self.as_mut() { + ExprF::BinOp(BinOp::ImportAlt, l, r) => { + let garbage_expr = ExprF::BoolLit(false); + let new_self = if l.traverse_resolve_mut(f).is_ok() { + l + } else { + r.traverse_resolve_mut(f)?; + r + }; + *self.as_mut() = + std::mem::replace(new_self.as_mut(), garbage_expr); + } + _ => { + self.as_mut().traverse_mut(|e| e.traverse_resolve_mut(f))?; + if let ExprF::Import(import) = self.as_mut() { + let garbage_import = Import { + mode: ImportMode::Code, + location: ImportLocation::Missing, + hash: None, + }; + // Move out of &mut import + let import = std::mem::replace(import, garbage_import); + *self.as_mut() = ExprF::Embed(f(import)?); + } + } + } + Ok(()) } } diff --git a/dhall_syntax/src/core/import.rs b/dhall_syntax/src/core/import.rs index d1f3fca..43597df 100644 --- a/dhall_syntax/src/core/import.rs +++ b/dhall_syntax/src/core/import.rs @@ -57,7 +57,7 @@ pub struct Import<SubExpr> { } impl<SE> URL<SE> { - pub fn visit_subexpr<'a, Err, SE2>( + pub fn traverse_ref<'a, Err, SE2>( &'a self, f: impl FnOnce(&'a SE) -> Result<SE2, Err>, ) -> Result<URL<SE2>, Err> { @@ -70,32 +70,56 @@ impl<SE> URL<SE> { headers, }) } + pub fn traverse_mut<'a, Err>( + &'a mut self, + f: impl FnOnce(&'a mut SE) -> Result<(), Err>, + ) -> Result<(), Err> { + if let Some(header) = &mut self.headers { + f(header)?; + } + Ok(()) + } } impl<SE> ImportLocation<SE> { - pub fn visit_subexpr<'a, Err, SE2>( + pub fn traverse_ref<'a, Err, SE2>( &'a self, f: impl FnOnce(&'a SE) -> Result<SE2, Err>, ) -> Result<ImportLocation<SE2>, Err> { use ImportLocation::*; Ok(match self { Local(prefix, path) => Local(*prefix, path.clone()), - Remote(url) => Remote(url.visit_subexpr(f)?), + Remote(url) => Remote(url.traverse_ref(f)?), Env(env) => Env(env.clone()), Missing => Missing, }) } + pub fn traverse_mut<'a, Err>( + &'a mut self, + f: impl FnOnce(&'a mut SE) -> Result<(), Err>, + ) -> Result<(), Err> { + if let ImportLocation::Remote(url) = self { + url.traverse_mut(f)?; + } + Ok(()) + } } impl<SE> Import<SE> { - pub fn visit_subexpr<'a, Err, SE2>( + pub fn traverse_ref<'a, Err, SE2>( &'a self, f: impl FnOnce(&'a SE) -> Result<SE2, Err>, ) -> Result<Import<SE2>, Err> { Ok(Import { mode: self.mode, - location: self.location.visit_subexpr(f)?, + location: self.location.traverse_ref(f)?, hash: self.hash.clone(), }) } + pub fn traverse_mut<'a, Err>( + &'a mut self, + f: impl FnOnce(&'a mut SE) -> Result<(), Err>, + ) -> Result<(), Err> { + self.location.traverse_mut(f) + } } diff --git a/dhall_syntax/src/core/map.rs b/dhall_syntax/src/core/map.rs index 6a0ebda..c4c6126 100644 --- a/dhall_syntax/src/core/map.rs +++ b/dhall_syntax/src/core/map.rs @@ -13,6 +13,8 @@ mod one_or_more { } pub type Iter<'a, T> = Either<slice::Iter<'a, T>, iter::Once<&'a T>>; + pub type IterMut<'a, T> = + Either<slice::IterMut<'a, T>, iter::Once<&'a mut T>>; pub type IntoIter<T> = Either<vec::IntoIter<T>, iter::Once<T>>; impl<T> OneOrMore<T> { @@ -36,6 +38,13 @@ mod one_or_more { OneOrMore::One(x) => Either::Right(iter::once(x)), } } + + pub fn iter_mut(&mut self) -> IterMut<'_, T> { + match self { + OneOrMore::More(vec) => Either::Left(vec.iter_mut()), + OneOrMore::One(x) => Either::Right(iter::once(x)), + } + } } impl<T> IntoIterator for OneOrMore<T> { @@ -76,6 +85,19 @@ mod dup_tree_map { iter: IterInternal<'a, K, V>, size: usize, } + pub type IterMutInternalIntermediate<'a, K, V> = + iter::Zip<iter::Repeat<&'a K>, one_or_more::IterMut<'a, V>>; + pub type IterMutInternal<'a, K, V> = iter::FlatMap< + btree_map::IterMut<'a, K, OneOrMore<V>>, + IterMutInternalIntermediate<'a, K, V>, + for<'b> fn( + (&'b K, &'b mut OneOrMore<V>), + ) -> IterMutInternalIntermediate<'b, K, V>, + >; + pub struct IterMut<'a, K, V> { + iter: IterMutInternal<'a, K, V>, + size: usize, + } pub type IntoIterInternalIntermediate<K, V> = iter::Zip<iter::Repeat<K>, one_or_more::IntoIter<V>>; pub type IntoIterInternal<K, V> = iter::FlatMap< @@ -134,6 +156,21 @@ mod dup_tree_map { size: self.size, } } + + pub fn iter_mut(&mut self) -> IterMut<'_, K, V> + where + K: Ord, + { + fn foo<'a, K, V>( + (k, oom): (&'a K, &'a mut OneOrMore<V>), + ) -> IterMutInternalIntermediate<'a, K, V> { + iter::repeat(k).zip(oom.iter_mut()) + } + IterMut { + iter: self.map.iter_mut().flat_map(foo), + size: self.size, + } + } } impl<K, V> Default for DupTreeMap<K, V> @@ -180,6 +217,18 @@ mod dup_tree_map { } } + impl<'a, K, V> IntoIterator for &'a mut DupTreeMap<K, V> + where + K: Ord, + { + type Item = (&'a K, &'a mut V); + type IntoIter = IterMut<'a, K, V>; + + fn into_iter(self) -> Self::IntoIter { + self.iter_mut() + } + } + impl<K, V> iter::FromIterator<(K, V)> for DupTreeMap<K, V> where K: Ord, @@ -212,6 +261,22 @@ mod dup_tree_map { } } + impl<'a, K, V> Iterator for IterMut<'a, K, V> { + type Item = (&'a K, &'a mut V); + + fn next(&mut self) -> Option<Self::Item> { + let next = self.iter.next(); + if next.is_some() { + self.size -= 1; + } + next + } + + fn size_hint(&self) -> (usize, Option<usize>) { + (self.size, Some(self.size)) + } + } + impl<K, V> Iterator for IntoIter<K, V> where K: Clone, diff --git a/dhall_syntax/src/core/text.rs b/dhall_syntax/src/core/text.rs index 10fd68a..e17f00f 100644 --- a/dhall_syntax/src/core/text.rs +++ b/dhall_syntax/src/core/text.rs @@ -76,6 +76,16 @@ impl<SubExpr> InterpolatedText<SubExpr> { }) } + pub fn traverse_mut<'a, E, F>(&'a mut self, mut f: F) -> Result<(), E> + where + F: FnMut(&'a mut SubExpr) -> Result<(), E>, + { + for (e, _) in &mut self.tail { + f(e)? + } + Ok(()) + } + pub fn iter<'a>( &'a self, ) -> impl Iterator<Item = InterpolatedTextContents<&'a SubExpr>> + 'a { diff --git a/dhall_syntax/src/core/visitor.rs b/dhall_syntax/src/core/visitor.rs index addb282..39a027f 100644 --- a/dhall_syntax/src/core/visitor.rs +++ b/dhall_syntax/src/core/visitor.rs @@ -1,11 +1,6 @@ use crate::*; use std::iter::FromIterator; -/// A way too generic Visitor trait. -pub trait GenericVisitor<Input, Output>: Sized { - fn visit(self, input: Input) -> Output; -} - /// A visitor trait that can be used to traverse `ExprF`s. We need this pattern so that Rust lets /// us have as much mutability as we can. /// For example, `traverse_ref_with_special_handling_of_binders` cannot be made using only @@ -14,7 +9,7 @@ pub trait GenericVisitor<Input, Output>: Sized { /// preventing exactly this ! So we have to be more clever. The visitor pattern allows us to have /// only one mutable thing the whole time: the visitor itself. The visitor can then carry around /// multiple closures or just one, and Rust is ok with either. See for example TraverseRefVisitor. -pub trait ExprFFallibleVisitor<'a, SE1, SE2, E1, E2>: Sized { +pub trait ExprFVisitor<'a, SE1, SE2, E1, E2>: Sized { type Error; fn visit_subexpr(&mut self, subexpr: &'a SE1) -> Result<SE2, Self::Error>; @@ -27,174 +22,263 @@ pub trait ExprFFallibleVisitor<'a, SE1, SE2, E1, E2>: Sized { ) -> Result<SE2, Self::Error> { self.visit_subexpr(subexpr) } + + fn visit( + self, + input: &'a ExprF<SE1, E1>, + ) -> Result<ExprF<SE2, E2>, Self::Error> { + visit_ref(self, input) + } } -/// Like ExprFFallibleVisitor, but without the error handling. -pub trait ExprFInFallibleVisitor<'a, SE1, SE2, E1, E2>: Sized { - fn visit_subexpr(&mut self, subexpr: &'a SE1) -> SE2; - fn visit_embed(self, embed: &'a E1) -> E2; +/// Like `ExprFVisitor`, but by mutable reference +pub trait ExprFMutVisitor<'a, SE, E>: Sized { + type Error; + + fn visit_subexpr(&mut self, subexpr: &'a mut SE) + -> Result<(), Self::Error>; + fn visit_embed(self, _embed: &'a mut E) -> Result<(), Self::Error> { + Ok(()) + } fn visit_subexpr_under_binder( mut self, - _label: &'a Label, - subexpr: &'a SE1, - ) -> SE2 { + _label: &'a mut Label, + subexpr: &'a mut SE, + ) -> Result<(), Self::Error> { self.visit_subexpr(subexpr) } + + fn visit(self, input: &'a mut ExprF<SE, E>) -> Result<(), Self::Error> { + visit_mut(self, input) + } } -impl<'a, T, SE1, SE2, E1, E2> - GenericVisitor<&'a ExprF<SE1, E1>, Result<ExprF<SE2, E2>, T::Error>> for T +fn visit_ref<'a, V, SE1, SE2, E1, E2>( + mut v: V, + input: &'a ExprF<SE1, E1>, +) -> Result<ExprF<SE2, E2>, V::Error> where - T: ExprFFallibleVisitor<'a, SE1, SE2, E1, E2>, + V: ExprFVisitor<'a, SE1, SE2, E1, E2>, { - fn visit( - self, - input: &'a ExprF<SE1, E1>, - ) -> Result<ExprF<SE2, E2>, T::Error> { - fn vec<'a, T, U, Err, F: FnMut(&'a T) -> Result<U, Err>>( - x: &'a [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 vec<'a, T, U, Err, F: FnMut(&'a T) -> Result<U, Err>>( + x: &'a [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 dupmap<'a, V, SE1, SE2, E1, E2, T>( + x: impl IntoIterator<Item = (&'a Label, &'a SE1)>, + mut v: V, + ) -> Result<T, V::Error> + where + SE1: 'a, + T: FromIterator<(Label, SE2)>, + V: ExprFVisitor<'a, SE1, SE2, E1, E2>, + { + x.into_iter() + .map(|(k, x)| Ok((k.clone(), v.visit_subexpr(x)?))) + .collect() + } + fn optdupmap<'a, V, SE1, SE2, E1, E2, T>( + x: impl IntoIterator<Item = (&'a Label, &'a Option<SE1>)>, + mut v: V, + ) -> Result<T, V::Error> + where + SE1: 'a, + T: FromIterator<(Label, Option<SE2>)>, + V: ExprFVisitor<'a, SE1, SE2, E1, E2>, + { + x.into_iter() + .map(|(k, x)| { + Ok(( + k.clone(), + match x { + Some(x) => Some(v.visit_subexpr(x)?), + None => None, + }, + )) }) + .collect() + } + + use crate::ExprF::*; + Ok(match input { + Var(v) => Var(v.clone()), + Lam(l, t, e) => { + let t = v.visit_subexpr(t)?; + let e = v.visit_subexpr_under_binder(l, e)?; + Lam(l.clone(), t, e) } - fn dupmap<'a, V, SE1, SE2, E1, E2, T>( - x: impl IntoIterator<Item = (&'a Label, &'a SE1)>, - mut v: V, - ) -> Result<T, V::Error> - where - SE1: 'a, - T: FromIterator<(Label, SE2)>, - V: ExprFFallibleVisitor<'a, SE1, SE2, E1, E2>, - { - x.into_iter() - .map(|(k, x)| Ok((k.clone(), v.visit_subexpr(x)?))) - .collect() + Pi(l, t, e) => { + let t = v.visit_subexpr(t)?; + let e = v.visit_subexpr_under_binder(l, e)?; + Pi(l.clone(), t, e) } - fn optdupmap<'a, V, SE1, SE2, E1, E2, T>( - x: impl IntoIterator<Item = (&'a Label, &'a Option<SE1>)>, - mut v: V, - ) -> Result<T, V::Error> - where - SE1: 'a, - T: FromIterator<(Label, Option<SE2>)>, - V: ExprFFallibleVisitor<'a, SE1, SE2, E1, E2>, - { - x.into_iter() - .map(|(k, x)| { - Ok(( - k.clone(), - match x { - Some(x) => Some(v.visit_subexpr(x)?), - None => None, - }, - )) - }) - .collect() + Let(l, t, a, e) => { + let t = opt(t, &mut |e| v.visit_subexpr(e))?; + let a = v.visit_subexpr(a)?; + let e = v.visit_subexpr_under_binder(l, e)?; + Let(l.clone(), t, a, e) } - - let mut v = self; - use crate::ExprF::*; - Ok(match input { - Var(v) => Var(v.clone()), - Lam(l, t, e) => { - let t = v.visit_subexpr(t)?; - let e = v.visit_subexpr_under_binder(l, e)?; - Lam(l.clone(), t, e) - } - Pi(l, t, e) => { - let t = v.visit_subexpr(t)?; - let e = v.visit_subexpr_under_binder(l, e)?; - Pi(l.clone(), t, e) - } - Let(l, t, a, e) => { - let t = opt(t, &mut |e| v.visit_subexpr(e))?; - let a = v.visit_subexpr(a)?; - let e = v.visit_subexpr_under_binder(l, e)?; - Let(l.clone(), t, a, e) - } - App(f, a) => App(v.visit_subexpr(f)?, v.visit_subexpr(a)?), - 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))?), - SomeLit(e) => SomeLit(v.visit_subexpr(e)?), - RecordType(kts) => RecordType(dupmap(kts, v)?), - RecordLit(kvs) => RecordLit(dupmap(kvs, v)?), - UnionType(kts) => UnionType(optdupmap(kts, v)?), - Merge(x, y, t) => Merge( - v.visit_subexpr(x)?, - v.visit_subexpr(y)?, - opt(t, |e| v.visit_subexpr(e))?, - ), - ToMap(x, t) => { - ToMap(v.visit_subexpr(x)?, opt(t, |e| v.visit_subexpr(e))?) - } - Field(e, l) => Field(v.visit_subexpr(e)?, l.clone()), - Projection(e, ls) => Projection(v.visit_subexpr(e)?, ls.clone()), - Assert(e) => Assert(v.visit_subexpr(e)?), - Import(i) => Import(i.visit_subexpr(|e| v.visit_subexpr(e))?), - Embed(a) => Embed(v.visit_embed(a)?), - }) - } + App(f, a) => App(v.visit_subexpr(f)?, v.visit_subexpr(a)?), + 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))?), + SomeLit(e) => SomeLit(v.visit_subexpr(e)?), + RecordType(kts) => RecordType(dupmap(kts, v)?), + RecordLit(kvs) => RecordLit(dupmap(kvs, v)?), + UnionType(kts) => UnionType(optdupmap(kts, v)?), + Merge(x, y, t) => Merge( + v.visit_subexpr(x)?, + v.visit_subexpr(y)?, + opt(t, |e| v.visit_subexpr(e))?, + ), + ToMap(x, t) => { + ToMap(v.visit_subexpr(x)?, opt(t, |e| v.visit_subexpr(e))?) + } + Field(e, l) => Field(v.visit_subexpr(e)?, l.clone()), + Projection(e, ls) => Projection(v.visit_subexpr(e)?, ls.clone()), + Assert(e) => Assert(v.visit_subexpr(e)?), + Import(i) => Import(i.traverse_ref(|e| v.visit_subexpr(e))?), + Embed(a) => Embed(v.visit_embed(a)?), + }) } -impl<'a, T, SE1, SE2, E1, E2> GenericVisitor<&'a ExprF<SE1, E1>, ExprF<SE2, E2>> - for T +fn visit_mut<'a, V, SE, E>( + mut v: V, + input: &'a mut ExprF<SE, E>, +) -> Result<(), V::Error> where - T: ExprFInFallibleVisitor<'a, SE1, SE2, E1, E2>, + V: ExprFMutVisitor<'a, SE, E>, { - fn visit(self, input: &'a ExprF<SE1, E1>) -> ExprF<SE2, E2> { - trivial_result(InfallibleWrapper(self).visit(input)) + fn vec<'a, V, SE, E>(v: &mut V, x: &'a mut Vec<SE>) -> Result<(), V::Error> + where + V: ExprFMutVisitor<'a, SE, E>, + { + for x in x { + v.visit_subexpr(x)?; + } + Ok(()) } -} - -struct InfallibleWrapper<T>(T); - -impl<'a, T, SE1, SE2, E1, E2> ExprFFallibleVisitor<'a, SE1, SE2, E1, E2> - for InfallibleWrapper<T> -where - T: ExprFInFallibleVisitor<'a, SE1, SE2, E1, E2>, -{ - type Error = !; - - fn visit_subexpr(&mut self, subexpr: &'a SE1) -> Result<SE2, Self::Error> { - Ok(self.0.visit_subexpr(subexpr)) + fn opt<'a, V, SE, E>( + v: &mut V, + x: &'a mut Option<SE>, + ) -> Result<(), V::Error> + where + V: ExprFMutVisitor<'a, SE, E>, + { + if let Some(x) = x { + v.visit_subexpr(x)?; + } + Ok(()) } - fn visit_embed(self, embed: &'a E1) -> Result<E2, Self::Error> { - Ok(self.0.visit_embed(embed)) + fn dupmap<'a, V, SE, E>( + mut v: V, + x: impl IntoIterator<Item = (&'a Label, &'a mut SE)>, + ) -> Result<(), V::Error> + where + SE: 'a, + V: ExprFMutVisitor<'a, SE, E>, + { + for (_, x) in x { + v.visit_subexpr(x)?; + } + Ok(()) + } + fn optdupmap<'a, V, SE, E>( + mut v: V, + x: impl IntoIterator<Item = (&'a Label, &'a mut Option<SE>)>, + ) -> Result<(), V::Error> + where + SE: 'a, + V: ExprFMutVisitor<'a, SE, E>, + { + for (_, x) in x { + opt(&mut v, x)?; + } + Ok(()) } - fn visit_subexpr_under_binder( - self, - label: &'a Label, - subexpr: &'a SE1, - ) -> Result<SE2, Self::Error> { - Ok(self.0.visit_subexpr_under_binder(label, subexpr)) + use crate::ExprF::*; + match input { + Var(_) | Const(_) | Builtin(_) | BoolLit(_) | NaturalLit(_) + | IntegerLit(_) | DoubleLit(_) => {} + Lam(l, t, e) => { + v.visit_subexpr(t)?; + v.visit_subexpr_under_binder(l, e)?; + } + Pi(l, t, e) => { + v.visit_subexpr(t)?; + v.visit_subexpr_under_binder(l, e)?; + } + Let(l, t, a, e) => { + opt(&mut v, t)?; + v.visit_subexpr(a)?; + v.visit_subexpr_under_binder(l, e)?; + } + App(f, a) => { + v.visit_subexpr(f)?; + v.visit_subexpr(a)?; + } + Annot(x, t) => { + v.visit_subexpr(x)?; + v.visit_subexpr(t)?; + } + TextLit(t) => t.traverse_mut(|e| v.visit_subexpr(e))?, + BinOp(_, x, y) => { + v.visit_subexpr(x)?; + v.visit_subexpr(y)?; + } + BoolIf(b, t, f) => { + v.visit_subexpr(b)?; + v.visit_subexpr(t)?; + v.visit_subexpr(f)?; + } + EmptyListLit(t) => v.visit_subexpr(t)?, + NEListLit(es) => vec(&mut v, es)?, + SomeLit(e) => v.visit_subexpr(e)?, + RecordType(kts) => dupmap(v, kts)?, + RecordLit(kvs) => dupmap(v, kvs)?, + UnionType(kts) => optdupmap(v, kts)?, + Merge(x, y, t) => { + v.visit_subexpr(x)?; + v.visit_subexpr(y)?; + opt(&mut v, t)?; + } + ToMap(x, t) => { + v.visit_subexpr(x)?; + opt(&mut v, t)?; + } + Field(e, _) => v.visit_subexpr(e)?, + Projection(e, _) => v.visit_subexpr(e)?, + Assert(e) => v.visit_subexpr(e)?, + Import(i) => i.traverse_mut(|e| v.visit_subexpr(e))?, + Embed(a) => v.visit_embed(a)?, } + Ok(()) } pub struct TraverseRefWithBindersVisitor<F1, F2> { @@ -202,7 +286,7 @@ pub struct TraverseRefWithBindersVisitor<F1, F2> { pub visit_under_binder: F2, } -impl<'a, SE, E, SE2, Err, F1, F2> ExprFFallibleVisitor<'a, SE, SE2, E, E> +impl<'a, SE, E, SE2, Err, F1, F2> ExprFVisitor<'a, SE, SE2, E, E> for TraverseRefWithBindersVisitor<F1, F2> where SE: 'a, @@ -231,7 +315,7 @@ pub struct TraverseRefVisitor<F1> { pub visit_subexpr: F1, } -impl<'a, SE, E, SE2, Err, F1> ExprFFallibleVisitor<'a, SE, SE2, E, E> +impl<'a, SE, E, SE2, Err, F1> ExprFVisitor<'a, SE, SE2, E, E> for TraverseRefVisitor<F1> where SE: 'a, @@ -248,27 +332,22 @@ where } } -pub struct ResolveVisitor<F1>(pub F1); +pub struct TraverseMutVisitor<F1> { + pub visit_subexpr: F1, +} -impl<'a, 'b, E, Err, F1> ExprFFallibleVisitor<'a, Expr<E>, Expr<E>, E, E> - for &'b mut ResolveVisitor<F1> +impl<'a, SE, E, Err, F1> ExprFMutVisitor<'a, SE, E> for TraverseMutVisitor<F1> where - E: Clone, - F1: FnMut(&Import<Expr<E>>) -> Result<E, Err>, + SE: 'a, + E: 'a, + F1: FnMut(&'a mut SE) -> Result<(), Err>, { type Error = Err; fn visit_subexpr( &mut self, - subexpr: &'a Expr<E>, - ) -> Result<Expr<E>, Self::Error> { - Ok(subexpr.rewrap( - subexpr - .as_ref() - .traverse_resolve_with_visitor(&mut **self)?, - )) - } - fn visit_embed(self, embed: &'a E) -> Result<E, Self::Error> { - Ok(embed.clone()) + subexpr: &'a mut SE, + ) -> Result<(), Self::Error> { + (self.visit_subexpr)(subexpr) } } |