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-rw-r--r--dhall/src/lib.rs10
-rw-r--r--dhall/src/semantics/builtins.rs12
-rw-r--r--dhall/src/semantics/mod.rs1
-rw-r--r--dhall/src/semantics/nze/value.rs7
-rw-r--r--dhall/src/semantics/resolve.rs13
-rw-r--r--dhall/src/semantics/tck/env.rs12
-rw-r--r--dhall/src/semantics/tck/typecheck.rs60
7 files changed, 58 insertions, 57 deletions
diff --git a/dhall/src/lib.rs b/dhall/src/lib.rs
index c2a2f19..2d261f9 100644
--- a/dhall/src/lib.rs
+++ b/dhall/src/lib.rs
@@ -79,7 +79,7 @@ impl Parsed {
resolve::resolve(self)
}
pub fn skip_resolve(self) -> Result<Resolved, Error> {
- resolve::skip_resolve_expr(self)
+ Ok(Resolved(resolve::skip_resolve(&self.0)?))
}
pub fn encode(&self) -> Result<Vec<u8>, EncodeError> {
@@ -94,10 +94,10 @@ impl Parsed {
impl Resolved {
pub fn typecheck(&self) -> Result<Typed, TypeError> {
- Ok(Typed(typecheck(&self.to_expr())?))
+ Ok(Typed(typecheck(&self.0)?))
}
pub fn typecheck_with(self, ty: &Normalized) -> Result<Typed, TypeError> {
- Ok(Typed(typecheck_with(&self.to_expr(), ty.to_expr())?))
+ Ok(Typed(typecheck_with(&self.0, ty.to_hir())?))
}
/// Converts a value back to the corresponding AST expression.
pub fn to_expr(&self) -> ResolvedExpr {
@@ -136,6 +136,10 @@ impl Normalized {
normalize: false,
})
}
+ /// Converts a value back to the corresponding Hir expression.
+ pub(crate) fn to_hir(&self) -> Hir {
+ self.0.to_hir_noenv()
+ }
/// Converts a value back to the corresponding AST expression, alpha-normalizing in the process.
pub(crate) fn to_expr_alpha(&self) -> NormalizedExpr {
self.0.to_expr(ToExprOptions {
diff --git a/dhall/src/semantics/builtins.rs b/dhall/src/semantics/builtins.rs
index 715e045..b1d12aa 100644
--- a/dhall/src/semantics/builtins.rs
+++ b/dhall/src/semantics/builtins.rs
@@ -1,5 +1,5 @@
use crate::semantics::{
- typecheck, Hir, HirKind, NzEnv, Value, ValueKind, VarEnv,
+ skip_resolve, typecheck, Hir, HirKind, NzEnv, Value, ValueKind, VarEnv,
};
use crate::syntax::map::DupTreeMap;
use crate::syntax::Const::Type;
@@ -115,9 +115,9 @@ macro_rules! make_type {
};
}
-pub(crate) fn type_of_builtin<E>(b: Builtin) -> Expr<E> {
+pub(crate) fn type_of_builtin(b: Builtin) -> Hir {
use Builtin::*;
- match b {
+ let expr = match b {
Bool | Natural | Integer | Double | Text => make_type!(Type),
List | Optional => make_type!(
Type -> Type
@@ -200,7 +200,8 @@ pub(crate) fn type_of_builtin<E>(b: Builtin) -> Expr<E> {
OptionalNone => make_type!(
forall (A: Type) -> Optional A
),
- }
+ };
+ skip_resolve(&expr).unwrap()
}
// Ad-hoc macro to help construct closures
@@ -264,7 +265,8 @@ fn apply_builtin(b: Builtin, args: Vec<Value>, env: NzEnv) -> ValueKind {
Value(Value),
DoneAsIs,
}
- let make_closure = |e| typecheck(&e).unwrap().eval(&env);
+ let make_closure =
+ |e| typecheck(&skip_resolve(&e).unwrap()).unwrap().eval(&env);
let ret = match (b, args.as_slice()) {
(OptionalNone, [t]) => Ret::ValueKind(EmptyOptionalLit(t.clone())),
diff --git a/dhall/src/semantics/mod.rs b/dhall/src/semantics/mod.rs
index a8c0659..ffa16ca 100644
--- a/dhall/src/semantics/mod.rs
+++ b/dhall/src/semantics/mod.rs
@@ -7,4 +7,5 @@ pub mod tck;
pub(crate) use self::builtins::*;
pub(crate) use self::hir::*;
pub(crate) use self::nze::*;
+pub(crate) use self::resolve::*;
pub(crate) use self::tck::*;
diff --git a/dhall/src/semantics/nze/value.rs b/dhall/src/semantics/nze/value.rs
index a771b91..48acdb5 100644
--- a/dhall/src/semantics/nze/value.rs
+++ b/dhall/src/semantics/nze/value.rs
@@ -327,9 +327,12 @@ impl Value {
Hir::new(hir, self.0.span.clone())
}
+ pub fn to_hir_noenv(&self) -> Hir {
+ self.to_hir(VarEnv::new())
+ }
pub fn to_tyexpr_tyenv(&self, tyenv: &TyEnv) -> TyExpr {
- let expr = self.to_hir(tyenv.as_varenv()).to_expr_tyenv(tyenv);
- type_with(tyenv, &expr).unwrap()
+ let hir = self.to_hir(tyenv.as_varenv());
+ type_with(tyenv, &hir).unwrap()
}
pub fn to_tyexpr_noenv(&self) -> TyExpr {
self.to_tyexpr_tyenv(&TyEnv::new())
diff --git a/dhall/src/semantics/resolve.rs b/dhall/src/semantics/resolve.rs
index e12e892..8c9bb05 100644
--- a/dhall/src/semantics/resolve.rs
+++ b/dhall/src/semantics/resolve.rs
@@ -6,7 +6,7 @@ use crate::error::{Error, ImportError};
use crate::semantics::{mkerr, Hir, HirKind, NameEnv};
use crate::syntax;
use crate::syntax::{BinOp, Expr, ExprKind, FilePath, ImportLocation, URL};
-use crate::{Normalized, Parsed, Resolved};
+use crate::{Normalized, Parsed, ParsedExpr, Resolved};
type Import = syntax::Import<Hir>;
@@ -162,13 +162,10 @@ pub(crate) fn resolve(parsed: Parsed) -> Result<Resolved, Error> {
resolve_with_env(&mut ResolveEnv::new(), parsed)
}
-pub(crate) fn skip_resolve_expr(parsed: Parsed) -> Result<Resolved, Error> {
- let Parsed(expr, _) = parsed;
- let resolved =
- traverse_resolve_expr(&mut NameEnv::new(), &expr, &mut |import| {
- Err(ImportError::UnexpectedImport(import).into())
- })?;
- Ok(Resolved(resolved))
+pub(crate) fn skip_resolve(expr: &ParsedExpr) -> Result<Hir, Error> {
+ traverse_resolve_expr(&mut NameEnv::new(), expr, &mut |import| {
+ Err(ImportError::UnexpectedImport(import).into())
+ })
}
pub trait Canonicalize {
diff --git a/dhall/src/semantics/tck/env.rs b/dhall/src/semantics/tck/env.rs
index af955f4..3b02074 100644
--- a/dhall/src/semantics/tck/env.rs
+++ b/dhall/src/semantics/tck/env.rs
@@ -21,9 +21,9 @@ pub(crate) struct TyEnv {
}
impl VarEnv {
- // pub fn new() -> Self {
- // VarEnv { size: 0 }
- // }
+ pub fn new() -> Self {
+ VarEnv { size: 0 }
+ }
pub fn size(&self) -> usize {
self.size
}
@@ -116,9 +116,7 @@ impl TyEnv {
items: self.items.insert_value(e, ty),
}
}
- pub fn lookup(&self, var: &V) -> Option<(AlphaVar, Type)> {
- let var = self.names.unlabel_var(var)?;
- let ty = self.items.lookup_ty(&var);
- Some((var, ty))
+ pub fn lookup(&self, var: &AlphaVar) -> Type {
+ self.items.lookup_ty(&var)
}
}
diff --git a/dhall/src/semantics/tck/typecheck.rs b/dhall/src/semantics/tck/typecheck.rs
index eb6a58c..ac113cd 100644
--- a/dhall/src/semantics/tck/typecheck.rs
+++ b/dhall/src/semantics/tck/typecheck.rs
@@ -5,11 +5,11 @@ use std::collections::HashMap;
use crate::error::{ErrorBuilder, TypeError, TypeMessage};
use crate::semantics::merge_maps;
use crate::semantics::{
- type_of_builtin, Binder, BuiltinClosure, Closure, TyEnv, TyExpr,
- TyExprKind, Type, Value, ValueKind,
+ type_of_builtin, Binder, BuiltinClosure, Closure, Hir, HirKind, TyEnv,
+ TyExpr, TyExprKind, Type, Value, ValueKind,
};
use crate::syntax::{
- BinOp, Builtin, Const, Expr, ExprKind, InterpolatedTextContents, Span,
+ BinOp, Builtin, Const, ExprKind, InterpolatedTextContents, Span,
};
use crate::Normalized;
@@ -115,8 +115,8 @@ fn type_one_layer(
ExprKind::Const(Const::Type) => Value::from_const(Const::Kind),
ExprKind::Const(Const::Kind) => Value::from_const(Const::Sort),
ExprKind::Builtin(b) => {
- let t_expr = type_of_builtin(*b);
- let t_tyexpr = type_with(env, &t_expr)?;
+ let t_hir = type_of_builtin(*b);
+ let t_tyexpr = typecheck(&t_hir)?;
t_tyexpr.eval(env.as_nzenv())
}
ExprKind::BoolLit(_) => Value::from_builtin(Builtin::Bool),
@@ -761,25 +761,16 @@ fn type_one_layer(
}
/// `type_with` typechecks an expressio in the provided environment.
-pub(crate) fn type_with(
- env: &TyEnv,
- expr: &Expr<Normalized>,
-) -> Result<TyExpr, TypeError> {
- let (tyekind, ty) = match expr.as_ref() {
- ExprKind::Var(var) => match env.lookup(&var) {
- Some((v, ty)) => (TyExprKind::Var(v), Some(ty)),
- None => {
- return mkerr(
- ErrorBuilder::new(format!("unbound variable `{}`", var))
- .span_err(expr.span(), "not found in this scope")
- .format(),
- )
- }
- },
- ExprKind::Const(Const::Sort) => {
+pub(crate) fn type_with(env: &TyEnv, hir: &Hir) -> Result<TyExpr, TypeError> {
+ let (tyekind, ty) = match hir.kind() {
+ HirKind::Var(var) => (TyExprKind::Var(*var), Some(env.lookup(&var))),
+ HirKind::Expr(ExprKind::Var(_)) => {
+ unreachable!("Hir should contain no unresolved variables")
+ }
+ HirKind::Expr(ExprKind::Const(Const::Sort)) => {
(TyExprKind::Expr(ExprKind::Const(Const::Sort)), None)
}
- ExprKind::Embed(p) => {
+ HirKind::Expr(ExprKind::Embed(p)) => {
let val = p.clone().into_value();
(
val.to_tyexpr_noenv().kind().clone(),
@@ -787,7 +778,7 @@ pub(crate) fn type_with(
)
// return Ok(p.clone().into_value().to_tyexpr_noenv())
}
- ekind => {
+ HirKind::Expr(ekind) => {
let ekind = match ekind {
ExprKind::Lam(binder, annot, body) => {
let annot = type_with(env, annot)?;
@@ -805,7 +796,13 @@ pub(crate) fn type_with(
}
ExprKind::Let(binder, annot, val, body) => {
let val = if let Some(t) = annot {
- t.rewrap(ExprKind::Annot(val.clone(), t.clone()))
+ Hir::new(
+ HirKind::Expr(ExprKind::Annot(
+ val.clone(),
+ t.clone(),
+ )),
+ t.span(),
+ )
} else {
val.clone()
};
@@ -818,16 +815,16 @@ pub(crate) fn type_with(
}
_ => ekind.traverse_ref(|e| type_with(env, e))?,
};
- return type_one_layer(env, ekind, expr.span());
+ return type_one_layer(env, ekind, hir.span());
}
};
- Ok(TyExpr::new(tyekind, ty, expr.span()))
+ Ok(TyExpr::new(tyekind, ty, hir.span()))
}
/// Typecheck an expression and return the expression annotated with types if type-checking
/// succeeded, or an error if type-checking failed.
-pub(crate) fn typecheck(e: &Expr<Normalized>) -> Result<TyExpr, TypeError> {
+pub(crate) fn typecheck(e: &Hir) -> Result<TyExpr, TypeError> {
let res = type_with(&TyEnv::new(), e)?;
// Ensure that the inferred type exists (i.e. this is not Sort)
res.get_type()?;
@@ -835,9 +832,8 @@ pub(crate) fn typecheck(e: &Expr<Normalized>) -> Result<TyExpr, TypeError> {
}
/// Like `typecheck`, but additionally checks that the expression's type matches the provided type.
-pub(crate) fn typecheck_with(
- expr: &Expr<Normalized>,
- ty: Expr<Normalized>,
-) -> Result<TyExpr, TypeError> {
- typecheck(&expr.rewrap(ExprKind::Annot(expr.clone(), ty)))
+pub(crate) fn typecheck_with(hir: &Hir, ty: Hir) -> Result<TyExpr, TypeError> {
+ let hir =
+ Hir::new(HirKind::Expr(ExprKind::Annot(hir.clone(), ty)), hir.span());
+ typecheck(&hir)
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 17:52:24 +0000