diff options
author | Nadrieril Feneanar | 2020-02-19 17:25:57 +0000 |
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committer | GitHub | 2020-02-19 17:25:57 +0000 |
commit | ffbde252a850c7d96e1000e1be52792c41733a28 (patch) | |
tree | e668b7f764fb4981a802bc619e0b2ff62fa9ce16 /dhall/src/syntax/ast/visitor.rs | |
parent | e4b3a879907b6dcc75d25847ae21a23d0201aae1 (diff) | |
parent | 7cbfc1a0d32766a383d1f48902502adaa2234d2f (diff) |
Merge pull request #131 from Nadrieril/hir
Decouple main expression types
Diffstat (limited to 'dhall/src/syntax/ast/visitor.rs')
-rw-r--r-- | dhall/src/syntax/ast/visitor.rs | 397 |
1 files changed, 83 insertions, 314 deletions
diff --git a/dhall/src/syntax/ast/visitor.rs b/dhall/src/syntax/ast/visitor.rs index 6a1ce7d..c361bc1 100644 --- a/dhall/src/syntax/ast/visitor.rs +++ b/dhall/src/syntax/ast/visitor.rs @@ -2,343 +2,112 @@ use std::iter::FromIterator; use crate::syntax::*; -/// A visitor trait that can be used to traverse `ExprKind`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 -/// `traverse_ref`, because `traverse_ref` takes a `FnMut` so we would need to pass multiple -/// mutable reverences to this argument to `traverse_ref`. But Rust's ownership system is all about -/// 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 ExprKindVisitor<'a, SE1, SE2, E1, E2>: Sized { - type Error; - - fn visit_subexpr(&mut self, subexpr: &'a SE1) -> Result<SE2, Self::Error>; - fn visit_embed(self, embed: &'a E1) -> Result<E2, Self::Error>; - - fn visit_subexpr_under_binder( - mut self, - _label: &'a Label, - subexpr: &'a SE1, - ) -> Result<SE2, Self::Error> { - self.visit_subexpr(subexpr) - } - - fn visit( - self, - input: &'a ExprKind<SE1, E1>, - ) -> Result<ExprKind<SE2, E2>, Self::Error> { - visit_ref(self, input) - } +fn vec<'a, T, U, Err>( + x: &'a [T], + f: impl FnMut(&'a T) -> Result<U, Err>, +) -> Result<Vec<U>, Err> { + x.iter().map(f).collect() } -/// Like `ExprKindVisitor`, but by mutable reference -pub trait ExprKindMutVisitor<'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 mut Label, - subexpr: &'a mut SE, - ) -> Result<(), Self::Error> { - self.visit_subexpr(subexpr) - } +fn opt<'a, T, U, Err>( + x: &'a Option<T>, + f: impl FnOnce(&'a T) -> Result<U, Err>, +) -> Result<Option<U>, Err> { + Ok(match x { + Some(x) => Some(f(x)?), + None => None, + }) +} - fn visit(self, input: &'a mut ExprKind<SE, E>) -> Result<(), Self::Error> { - visit_mut(self, input) - } +fn dupmap<'a, SE1, SE2, T, Err>( + x: impl IntoIterator<Item = (&'a Label, &'a SE1)>, + mut f: impl FnMut(&'a SE1) -> Result<SE2, Err>, +) -> Result<T, Err> +where + SE1: 'a, + T: FromIterator<(Label, SE2)>, +{ + x.into_iter().map(|(k, x)| Ok((k.clone(), f(x)?))).collect() } -fn visit_ref<'a, V, SE1, SE2, E1, E2>( - mut v: V, - input: &'a ExprKind<SE1, E1>, -) -> Result<ExprKind<SE2, E2>, V::Error> +fn optdupmap<'a, SE1, SE2, T, Err>( + x: impl IntoIterator<Item = (&'a Label, &'a Option<SE1>)>, + mut f: impl FnMut(&'a SE1) -> Result<SE2, Err>, +) -> Result<T, Err> where - V: ExprKindVisitor<'a, SE1, SE2, E1, E2>, + SE1: 'a, + T: FromIterator<(Label, Option<SE2>)>, { - 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, + x.into_iter() + .map(|(k, x)| { + Ok(( + k.clone(), + 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: ExprKindVisitor<'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: ExprKindVisitor<'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() + .collect() +} + +pub(crate) fn visit_ref<'a, F, SE1, SE2, Err>( + input: &'a ExprKind<SE1>, + mut f: F, +) -> Result<ExprKind<SE2>, Err> +where + F: FnMut(Option<&'a Label>, &'a SE1) -> Result<SE2, Err>, +{ + // Can't use closures because of borrowing rules + macro_rules! expr { + ($e:expr) => { + f(None, $e) + }; + ($l:expr, $e:expr) => { + f(Some($l), $e) + }; } use crate::syntax::ExprKind::*; 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)?; + let t = expr!(t)?; + let e = expr!(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)?; + let t = expr!(t)?; + let e = expr!(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 t = opt(t, &mut |e| expr!(e))?; + let a = expr!(a)?; + let e = expr!(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)?), + App(f, a) => App(expr!(f)?, expr!(a)?), + Annot(x, t) => Annot(expr!(x)?, expr!(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()), - ProjectionByExpr(e, x) => { - ProjectionByExpr(v.visit_subexpr(e)?, v.visit_subexpr(x)?) - } - Completion(e, x) => { - Completion(v.visit_subexpr(e)?, v.visit_subexpr(x)?) - } - 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)?), + Lit(l) => Lit(l.clone()), + TextLit(t) => TextLit(t.traverse_ref(|e| expr!(e))?), + BinOp(o, x, y) => BinOp(*o, expr!(x)?, expr!(y)?), + BoolIf(b, t, f) => BoolIf(expr!(b)?, expr!(t)?, expr!(f)?), + EmptyListLit(t) => EmptyListLit(expr!(t)?), + NEListLit(es) => NEListLit(vec(es, |e| expr!(e))?), + SomeLit(e) => SomeLit(expr!(e)?), + RecordType(kts) => RecordType(dupmap(kts, |e| expr!(e))?), + RecordLit(kvs) => RecordLit(dupmap(kvs, |e| expr!(e))?), + UnionType(kts) => UnionType(optdupmap(kts, |e| expr!(e))?), + Merge(x, y, t) => Merge(expr!(x)?, expr!(y)?, opt(t, |e| expr!(e))?), + ToMap(x, t) => ToMap(expr!(x)?, opt(t, |e| expr!(e))?), + Field(e, l) => Field(expr!(e)?, l.clone()), + Projection(e, ls) => Projection(expr!(e)?, ls.clone()), + ProjectionByExpr(e, x) => ProjectionByExpr(expr!(e)?, expr!(x)?), + Completion(e, x) => Completion(expr!(e)?, expr!(x)?), + Assert(e) => Assert(expr!(e)?), + Import(i) => Import(i.traverse_ref(|e| expr!(e))?), }) } - -fn visit_mut<'a, V, SE, E>( - mut v: V, - input: &'a mut ExprKind<SE, E>, -) -> Result<(), V::Error> -where - V: ExprKindMutVisitor<'a, SE, E>, -{ - fn vec<'a, V, SE, E>(v: &mut V, x: &'a mut Vec<SE>) -> Result<(), V::Error> - where - V: ExprKindMutVisitor<'a, SE, E>, - { - for x in x { - v.visit_subexpr(x)?; - } - Ok(()) - } - fn opt<'a, V, SE, E>( - v: &mut V, - x: &'a mut Option<SE>, - ) -> Result<(), V::Error> - where - V: ExprKindMutVisitor<'a, SE, E>, - { - if let Some(x) = x { - v.visit_subexpr(x)?; - } - Ok(()) - } - 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: ExprKindMutVisitor<'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: ExprKindMutVisitor<'a, SE, E>, - { - for (_, x) in x { - opt(&mut v, x)?; - } - Ok(()) - } - - use crate::syntax::ExprKind::*; - 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)?, - ProjectionByExpr(e, x) => { - v.visit_subexpr(e)?; - v.visit_subexpr(x)?; - } - Completion(x, y) => { - v.visit_subexpr(x)?; - v.visit_subexpr(y)?; - } - 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 TraverseRefMaybeBinderVisitor<F>(pub F); - -impl<'a, SE, E, SE2, Err, F> ExprKindVisitor<'a, SE, SE2, E, E> - for TraverseRefMaybeBinderVisitor<F> -where - SE: 'a, - E: 'a + Clone, - F: FnMut(Option<&'a Label>, &'a SE) -> Result<SE2, Err>, -{ - type Error = Err; - - fn visit_subexpr(&mut self, subexpr: &'a SE) -> Result<SE2, Self::Error> { - (self.0)(None, subexpr) - } - fn visit_subexpr_under_binder( - mut self, - label: &'a Label, - subexpr: &'a SE, - ) -> Result<SE2, Self::Error> { - (self.0)(Some(label), subexpr) - } - fn visit_embed(self, embed: &'a E) -> Result<E, Self::Error> { - Ok(embed.clone()) - } -} - -pub struct TraverseMutVisitor<F1> { - pub visit_subexpr: F1, -} - -impl<'a, SE, E, Err, F1> ExprKindMutVisitor<'a, SE, E> - for TraverseMutVisitor<F1> -where - SE: 'a, - E: 'a, - F1: FnMut(&'a mut SE) -> Result<(), Err>, -{ - type Error = Err; - - fn visit_subexpr( - &mut self, - subexpr: &'a mut SE, - ) -> Result<(), Self::Error> { - (self.visit_subexpr)(subexpr) - } -} |