diff options
Diffstat (limited to 'dhall/src')
| -rw-r--r-- | dhall/src/typecheck.rs | 95 |
1 files changed, 55 insertions, 40 deletions
diff --git a/dhall/src/typecheck.rs b/dhall/src/typecheck.rs index 37c95c5..6fb7cac 100644 --- a/dhall/src/typecheck.rs +++ b/dhall/src/typecheck.rs @@ -176,6 +176,18 @@ impl TypedImproved { TypedImproved::Expr(e) => Ok(e), } } + fn normalize_to_type(self) -> Result<Type<'static>, TypeError> { + Ok(self.into_typed()?.normalize_to_type()) + } + fn get_type(&self) -> Result<Cow<'_, Type<'static>>, TypeError> { + Ok(Cow::Owned(self.clone().get_type_move()?)) + } + fn get_type_move(self) -> Result<Type<'static>, TypeError> { + Ok(self.into_typed()?.get_type_move()?) + } + fn normalize(self) -> Result<Normalized<'static>, TypeError> { + Ok(self.into_typed()?.normalize()) + } } #[derive(Debug, Clone)] @@ -453,7 +465,7 @@ fn mktype( ctx: &TypecheckContext, e: SubExpr<X, Normalized<'static>>, ) -> Result<Type<'static>, TypeError> { - Ok(type_with(ctx, e)?.into_typed()?.normalize_to_type()) + Ok(type_with(ctx, e)?.normalize_to_type()?) } fn into_simple_type<'a>(e: SubExpr<X, X>) -> Type<'a> { @@ -549,7 +561,7 @@ fn type_with( ctx, // Typecheck recursively all subexpressions e.as_ref().traverse_ref_simple(|e| { - Ok(type_with(ctx, e.clone())?.into_typed()?) + Ok(type_with(ctx, e.clone())?) })?, e.clone(), ), @@ -574,7 +586,7 @@ fn type_with( /// layer. fn type_last_layer( ctx: &TypecheckContext, - e: ExprF<Typed<'static>, Label, X, Normalized<'static>>, + e: ExprF<TypedImproved, Label, X, Normalized<'static>>, original_e: SubExpr<X, Normalized<'static>>, ) -> Result<Ret, TypeError> { use dhall_core::BinOp::*; @@ -609,12 +621,12 @@ fn type_last_layer( Ok(RetExpr(Let( x.clone(), None, - a.normalize().embed(), + a.normalize()?.embed(), tb.embed_absurd(), ))) } Annot(x, t) => { - let t = t.normalize_to_type(); + let t = t.normalize_to_type()?; ensure_equal!( &t, x.get_type()?, @@ -648,7 +660,7 @@ fn type_last_layer( Ok(RetType(y.get_type_move()?)) } EmptyListLit(t) => { - let t = t.normalize_to_type(); + let t = t.normalize_to_type()?; ensure_simple_type!( t, mkerr(InvalidListType(t.into_normalized()?)), @@ -679,15 +691,15 @@ fn type_last_layer( Ok(RetExpr(dhall::expr!(List t))) } OldOptionalLit(None, t) => { - let t = t.normalize().embed(); + let t = t.normalize()?.embed(); let e = dhall::subexpr!(None t); Ok(RetType( type_with(ctx, e)?.into_typed()?.get_type()?.into_owned(), )) } OldOptionalLit(Some(x), t) => { - let t = t.normalize().embed(); - let x = x.normalize().embed(); + let t = t.normalize()?.embed(); + let x = x.normalize()?.embed(); let e = dhall::subexpr!(Some x : Optional t); Ok(RetType( type_with(ctx, e)?.into_typed()?.get_type()?.into_owned(), @@ -759,7 +771,10 @@ fn type_last_layer( let mut kts: std::collections::BTreeMap<_, _> = kvs .into_iter() .map(|(x, v)| { - let t = v.map(|x| x.normalize().embed()); + let t = match v { + Some(x) => Some(x.normalize()?.embed()), + None => None, + }; Ok((x, t)) }) .collect::<Result<_, _>>()?; @@ -773,7 +788,7 @@ fn type_last_layer( None => Err(mkerr(MissingRecordField(x, r))), }, _ => { - let r = r.normalize_to_type(); + let r = r.normalize_to_type()?; match r.as_normalized()?.as_expr().as_ref() { UnionType(kts) => match kts.get(&x) { // Constructor has type T -> < x: T, ... > @@ -860,21 +875,21 @@ pub(crate) enum TypeMessage<'a> { UnboundVariable(V<Label>), InvalidInputType(Normalized<'a>), InvalidOutputType(Normalized<'a>), - NotAFunction(Typed<'a>), - TypeMismatch(Typed<'a>, Normalized<'a>, Typed<'a>), - AnnotMismatch(Typed<'a>, Normalized<'a>), + NotAFunction(TypedImproved), + TypeMismatch(TypedImproved, Normalized<'a>, TypedImproved), + AnnotMismatch(TypedImproved, Normalized<'a>), Untyped, - InvalidListElement(usize, Normalized<'a>, Typed<'a>), + InvalidListElement(usize, Normalized<'a>, TypedImproved), InvalidListType(Normalized<'a>), InvalidOptionalType(Normalized<'a>), - InvalidPredicate(Typed<'a>), - IfBranchMismatch(Typed<'a>, Typed<'a>), - IfBranchMustBeTerm(bool, Typed<'a>), - InvalidFieldType(Label, Typed<'a>), + InvalidPredicate(TypedImproved), + IfBranchMismatch(TypedImproved, TypedImproved), + IfBranchMustBeTerm(bool, TypedImproved), + InvalidFieldType(Label, TypedImproved), NotARecord(Label, Normalized<'a>), - MissingRecordField(Label, Typed<'a>), + MissingRecordField(Label, TypedImproved), MissingUnionField(Label, Normalized<'a>), - BinOpTypeMismatch(BinOp, Typed<'a>), + BinOpTypeMismatch(BinOp, TypedImproved), NoDependentTypes(Normalized<'a>, Normalized<'a>), Unimplemented, } @@ -926,25 +941,25 @@ impl fmt::Display for TypeMessage<'static> { // UnboundVariable(_) => { // f.write_str(include_str!("errors/UnboundVariable.txt")) // } - TypeMismatch(e0, e1, e2) => { - let template = include_str!("errors/TypeMismatch.txt"); - let s = template - .replace("$txt0", &format!("{}", e0.as_expr())) - .replace("$txt1", &format!("{}", e1.as_expr())) - .replace("$txt2", &format!("{}", e2.as_expr())) - .replace( - "$txt3", - &format!( - "{}", - e2.get_type() - .unwrap() - .as_normalized() - .unwrap() - .as_expr() - ), - ); - f.write_str(&s) - } + // TypeMismatch(e0, e1, e2) => { + // let template = include_str!("errors/TypeMismatch.txt"); + // let s = template + // .replace("$txt0", &format!("{}", e0.as_expr())) + // .replace("$txt1", &format!("{}", e1.as_expr())) + // .replace("$txt2", &format!("{}", e2.as_expr())) + // .replace( + // "$txt3", + // &format!( + // "{}", + // e2.get_type() + // .unwrap() + // .as_normalized() + // .unwrap() + // .as_expr() + // ), + // ); + // f.write_str(&s) + // } _ => f.write_str("Unhandled error message"), } } |