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-rw-r--r--dhall/src/lib.rs2
-rw-r--r--dhall/src/typecheck.rs406
-rw-r--r--dhall/tests/common/mod.rs16
-rw-r--r--dhall/tests/typecheck.rs137
-rw-r--r--dhall_core/src/core.rs147
-rw-r--r--dhall_core/src/text.rs22
-rw-r--r--dhall_generator/src/dhall_expr.rs57
-rw-r--r--dhall_generator/src/dhall_type.rs4
-rw-r--r--dhall_generator/src/lib.rs13
9 files changed, 542 insertions, 262 deletions
diff --git a/dhall/src/lib.rs b/dhall/src/lib.rs
index 0270103..103fd29 100644
--- a/dhall/src/lib.rs
+++ b/dhall/src/lib.rs
@@ -14,6 +14,8 @@ mod dhall_type;
pub mod imports;
pub mod typecheck;
pub use crate::dhall_type::*;
+pub use dhall_generator::expr;
+pub use dhall_generator::subexpr;
pub use dhall_generator::Type;
pub use crate::imports::*;
diff --git a/dhall/src/typecheck.rs b/dhall/src/typecheck.rs
index 145de63..e63b032 100644
--- a/dhall/src/typecheck.rs
+++ b/dhall/src/typecheck.rs
@@ -6,7 +6,7 @@ use crate::normalize::normalize;
use dhall_core;
use dhall_core::context::Context;
use dhall_core::*;
-use dhall_generator::dhall_expr;
+use dhall_generator as dhall;
use self::TypeMessage::*;
@@ -112,31 +112,31 @@ where
go::<S, T>(&mut ctx, eL0, eR0)
}
-fn type_of_builtin<S>(b: Builtin) -> SubExpr<S, X> {
+fn type_of_builtin<S>(b: Builtin) -> Expr<S, X> {
use dhall_core::Builtin::*;
match b {
- Bool | Natural | Integer | Double | Text => dhall_expr!(Type),
- List | Optional => dhall_expr!(
+ Bool | Natural | Integer | Double | Text => dhall::expr!(Type),
+ List | Optional => dhall::expr!(
Type -> Type
),
- NaturalFold => dhall_expr!(
+ NaturalFold => dhall::expr!(
Natural ->
forall (natural: Type) ->
forall (succ: natural -> natural) ->
forall (zero: natural) ->
natural
),
- NaturalBuild => dhall_expr!(
+ NaturalBuild => dhall::expr!(
(forall (natural: Type) ->
forall (succ: natural -> natural) ->
forall (zero: natural) ->
natural) ->
Natural
),
- NaturalIsZero | NaturalEven | NaturalOdd => dhall_expr!(
+ NaturalIsZero | NaturalEven | NaturalOdd => dhall::expr!(
Natural -> Bool
),
- ListBuild => dhall_expr!(
+ ListBuild => dhall::expr!(
forall (a: Type) ->
(forall (list: Type) ->
forall (cons: a -> list -> list) ->
@@ -144,7 +144,7 @@ fn type_of_builtin<S>(b: Builtin) -> SubExpr<S, X> {
list) ->
List a
),
- ListFold => dhall_expr!(
+ ListFold => dhall::expr!(
forall (a: Type) ->
List a ->
forall (list: Type) ->
@@ -152,19 +152,19 @@ fn type_of_builtin<S>(b: Builtin) -> SubExpr<S, X> {
forall (nil: list) ->
list
),
- ListLength => dhall_expr!(forall (a: Type) -> List a -> Natural),
+ ListLength => dhall::expr!(forall (a: Type) -> List a -> Natural),
ListHead | ListLast => {
- dhall_expr!(forall (a: Type) -> List a -> Optional a)
+ dhall::expr!(forall (a: Type) -> List a -> Optional a)
}
- ListIndexed => dhall_expr!(
+ ListIndexed => dhall::expr!(
forall (a: Type) ->
List a ->
List { index: Natural, value: a }
),
- ListReverse => dhall_expr!(
+ ListReverse => dhall::expr!(
forall (a: Type) -> List a -> List a
),
- OptionalFold => dhall_expr!(
+ OptionalFold => dhall::expr!(
forall (a: Type) ->
Optional a ->
forall (optional: Type) ->
@@ -176,12 +176,29 @@ fn type_of_builtin<S>(b: Builtin) -> SubExpr<S, X> {
}
}
-/// Type-check an expression and return the expression'i type if type-checking
-/// suceeds or an error if type-checking fails
+fn ensure_equal<'a, S, F1, F2>(
+ x: &'a Expr<S, X>,
+ y: &'a Expr<S, X>,
+ mkerr: F1,
+ mkmsg: F2,
+) -> Result<(), TypeError<S>>
+where
+ S: std::fmt::Debug,
+ F1: FnOnce(TypeMessage<S>) -> TypeError<S>,
+ F2: FnOnce() -> TypeMessage<S>,
+{
+ if prop_equal(x, y) {
+ Ok(())
+ } else {
+ Err(mkerr(mkmsg()))
+ }
+}
+
+/// Type-check an expression and return the expression's type if type-checking
+/// succeeds or an error if type-checking fails
///
-/// `type_with` does not necessarily normalize the type since full normalization
-/// is not necessary for just type-checking. If you actually care about the
-/// returned type then you may want to `normalize` it afterwards.
+/// `type_with` normalizes the type since while type-checking. It expects the
+/// context to contain only normalized expressions.
pub fn type_with<S>(
ctx: &Context<Label, SubExpr<S, X>>,
e: SubExpr<S, X>,
@@ -205,31 +222,25 @@ where
_ => Err(mkerr(msg)),
};
- match e.as_ref() {
- Const(c) => axiom(*c).map(Const),
- Var(V(x, n)) => {
- return ctx
- .lookup(x, *n)
- .cloned()
- .ok_or_else(|| mkerr(UnboundVariable))
- }
- Lam(x, tA, b) => {
+ let ret = match e.as_ref() {
+ Lam(x, t, b) => {
+ let t2 = normalize(SubExpr::clone(t));
let ctx2 = ctx
- .insert(x.clone(), tA.clone())
+ .insert(x.clone(), t2.clone())
.map(|e| shift(1, &V(x.clone(), 0), e));
let tB = type_with(&ctx2, b.clone())?;
- let p = rc(Pi(x.clone(), tA.clone(), tB));
- let _ = type_with(ctx, p.clone())?;
- return Ok(p);
+ let _ = type_with(ctx, rc(Pi(x.clone(), t.clone(), tB.clone())))?;
+ Ok(Pi(x.clone(), t2, tB))
}
Pi(x, tA, tB) => {
- let tA2 = normalized_type_with(ctx, tA.clone())?;
- let kA = ensure_const(&tA2, InvalidInputType(tA.clone()))?;
+ let ttA = type_with(ctx, tA.clone())?;
+ let tA = normalize(SubExpr::clone(tA));
+ let kA = ensure_const(&ttA, InvalidInputType(tA.clone()))?;
let ctx2 = ctx
.insert(x.clone(), tA.clone())
.map(|e| shift(1, &V(x.clone(), 0), e));
- let tB = normalized_type_with(&ctx2, tB.clone())?;
+ let tB = type_with(&ctx2, tB.clone())?;
let kB = match tB.as_ref() {
Const(k) => *k,
_ => {
@@ -246,33 +257,6 @@ where
Ok(_) => Ok(Const(kB)),
}
}
- App(f, args) => {
- // Recurse on args
- let (a, tf) = match args.split_last() {
- None => return type_with(ctx, f.clone()),
- Some((a, args)) => (
- a,
- normalized_type_with(
- ctx,
- rc(App(f.clone(), args.to_vec())),
- )?,
- ),
- };
- let (x, tA, tB) = match tf.as_ref() {
- Pi(x, tA, tB) => (x, tA, tB),
- _ => {
- return Err(mkerr(NotAFunction(f.clone(), tf)));
- }
- };
- let tA = normalize(SubExpr::clone(tA));
- let tA2 = normalized_type_with(ctx, a.clone())?;
- if prop_equal(tA.as_ref(), tA2.as_ref()) {
- let vx0 = &V(x.clone(), 0);
- return Ok(subst_shift(vx0, &a, &tB));
- } else {
- Err(mkerr(TypeMismatch(f.clone(), tA, a.clone(), tA2)))
- }
- }
Let(f, mt, r, b) => {
let r = if let Some(t) = mt {
rc(Annot(SubExpr::clone(r), SubExpr::clone(t)))
@@ -281,14 +265,14 @@ where
};
let tR = type_with(ctx, r)?;
- let ttR = normalized_type_with(ctx, tR.clone())?;
+ let ttR = type_with(ctx, tR.clone())?;
// Don't bother to provide a `let`-specific version of this error
// message because this should never happen anyway
let kR = ensure_const(&ttR, InvalidInputType(tR.clone()))?;
let ctx2 = ctx.insert(f.clone(), tR.clone());
let tB = type_with(&ctx2, b.clone())?;
- let ttB = normalized_type_with(ctx, tB.clone())?;
+ let ttB = type_with(ctx, tB.clone())?;
// Don't bother to provide a `let`-specific version of this error
// message because this should never happen anyway
let kB = ensure_const(&ttB, InvalidOutputType(tB.clone()))?;
@@ -297,162 +281,174 @@ where
return Err(mkerr(NoDependentLet(tR, tB)));
}
- return Ok(tB);
- }
- Annot(x, t) => {
- // This is mainly just to check that `t` is not `Kind`
- let _ = type_with(ctx, t.clone())?;
-
- let t2 = normalized_type_with(ctx, x.clone())?;
- let t = normalize(t.clone());
- if prop_equal(t.as_ref(), t2.as_ref()) {
- return Ok(t.clone());
- } else {
- Err(mkerr(AnnotMismatch(x.clone(), t, t2)))
- }
+ Ok(tB.unroll())
}
- BoolIf(x, y, z) => {
- let tx = normalized_type_with(ctx, x.clone())?;
- match tx.as_ref() {
- Builtin(Bool) => {}
- _ => {
- return Err(mkerr(InvalidPredicate(x.clone(), tx)));
+ _ => match e
+ .as_ref()
+ .traverse_ref_simple(|e| Ok((e, type_with(ctx, e.clone())?)))?
+ {
+ Lam(_, _, _) => unreachable!(),
+ Pi(_, _, _) => unreachable!(),
+ Let(_, _, _, _) => unreachable!(),
+ Const(c) => axiom(c).map(Const),
+ Var(V(x, n)) => match ctx.lookup(&x, n) {
+ Some(e) => Ok(e.unroll()),
+ None => Err(mkerr(UnboundVariable)),
+ },
+ App((f, mut tf), args) => {
+ let mut iter = args.into_iter();
+ let mut seen_args: Vec<SubExpr<_, _>> = vec![];
+ while let Some((a, ta)) = iter.next() {
+ seen_args.push(a.clone());
+ let (x, tx, tb) = match tf.as_ref() {
+ Pi(x, tx, tb) => (x, tx, tb),
+ _ => {
+ return Err(mkerr(NotAFunction(
+ rc(App(f.clone(), seen_args)),
+ tf,
+ )));
+ }
+ };
+ ensure_equal(tx.as_ref(), ta.as_ref(), mkerr, || {
+ TypeMismatch(
+ rc(App(f.clone(), seen_args.clone())),
+ tx.clone(),
+ a.clone(),
+ ta.clone(),
+ )
+ })?;
+ tf = normalize(subst_shift(&V(x.clone(), 0), &a, &tb));
}
+ Ok(tf.unroll())
}
- let ty = normalized_type_with(ctx, y.clone())?;
- let tty = normalized_type_with(ctx, ty.clone())?;
- ensure_is_type(
- tty.clone(),
- IfBranchMustBeTerm(true, y.clone(), ty.clone(), tty.clone()),
- )?;
+ Annot((x, tx), (t, _)) => {
+ let t = normalize(t.clone());
+ ensure_equal(t.as_ref(), tx.as_ref(), mkerr, || {
+ AnnotMismatch(x.clone(), t.clone(), tx.clone())
+ })?;
+ Ok(t.unroll())
+ }
+ BoolIf((x, tx), (y, ty), (z, tz)) => {
+ ensure_equal(tx.as_ref(), &Builtin(Bool), mkerr, || {
+ InvalidPredicate(x.clone(), tx.clone())
+ })?;
+ let tty = type_with(ctx, ty.clone())?;
+ ensure_is_type(
+ tty.clone(),
+ IfBranchMustBeTerm(
+ true,
+ y.clone(),
+ ty.clone(),
+ tty.clone(),
+ ),
+ )?;
- let tz = normalized_type_with(ctx, z.clone())?;
- let ttz = normalized_type_with(ctx, tz.clone())?;
- ensure_is_type(
- ttz.clone(),
- IfBranchMustBeTerm(false, z.clone(), tz.clone(), ttz.clone()),
- )?;
+ let ttz = type_with(ctx, tz.clone())?;
+ ensure_is_type(
+ ttz.clone(),
+ IfBranchMustBeTerm(
+ false,
+ z.clone(),
+ tz.clone(),
+ ttz.clone(),
+ ),
+ )?;
- if !prop_equal(ty.as_ref(), tz.as_ref()) {
- return Err(mkerr(IfBranchMismatch(
- y.clone(),
- z.clone(),
- ty,
- tz,
- )));
+ ensure_equal(ty.as_ref(), tz.as_ref(), mkerr, || {
+ IfBranchMismatch(
+ y.clone(),
+ z.clone(),
+ ty.clone(),
+ tz.clone(),
+ )
+ })?;
+ Ok(ty.unroll())
}
- return Ok(ty);
- }
- EmptyListLit(t) => {
- let s = normalized_type_with(ctx, t.clone())?;
- ensure_is_type(s, InvalidListType(t.clone()))?;
- let t = normalize(SubExpr::clone(t));
- return Ok(dhall_expr!(List t));
- }
- NEListLit(xs) => {
- let mut iter = xs.iter().enumerate();
- let (_, first_x) = iter.next().unwrap();
- let t = type_with(ctx, first_x.clone())?;
-
- let s = normalized_type_with(ctx, t.clone())?;
- ensure_is_type(s, InvalidListType(t.clone()))?;
- let t = normalize(t);
- for (i, x) in iter {
- let t2 = normalized_type_with(ctx, x.clone())?;
- if !prop_equal(t.as_ref(), t2.as_ref()) {
- return Err(mkerr(InvalidListElement(i, t, x.clone(), t2)));
+ EmptyListLit((t, tt)) => {
+ ensure_is_type(tt, InvalidListType(t.clone()))?;
+ let t = normalize(SubExpr::clone(t));
+ Ok(dhall::expr!(List t))
+ }
+ NEListLit(xs) => {
+ let mut iter = xs.into_iter().enumerate();
+ let (_, (_, t)) = iter.next().unwrap();
+ let s = type_with(ctx, t.clone())?;
+ ensure_is_type(s, InvalidListType(t.clone()))?;
+ for (i, (y, ty)) in iter {
+ ensure_equal(t.as_ref(), ty.as_ref(), mkerr, || {
+ InvalidListElement(i, t.clone(), y.clone(), ty.clone())
+ })?;
}
+ Ok(dhall::expr!(List t))
}
- return Ok(dhall_expr!(List t));
- }
- EmptyOptionalLit(t) => {
- let s = normalized_type_with(ctx, t.clone())?;
- ensure_is_type(s, InvalidOptionalType(t.clone()))?;
- let t = normalize(t.clone());
- return Ok(dhall_expr!(Optional t));
- }
- NEOptionalLit(x) => {
- let t: SubExpr<_, _> = type_with(ctx, x.clone())?;
- let s = normalized_type_with(ctx, t.clone())?;
- ensure_is_type(s, InvalidOptionalType(t.clone()))?;
- let t = normalize(t);
- return Ok(dhall_expr!(Optional t));
- }
- RecordType(kts) => {
- for (k, t) in kts {
- let s = normalized_type_with(ctx, t.clone())?;
- ensure_is_type(s, InvalidFieldType(k.clone(), t.clone()))?;
+ EmptyOptionalLit((t, tt)) => {
+ ensure_is_type(tt, InvalidOptionalType(t.clone()))?;
+ let t = normalize(t.clone());
+ Ok(dhall::expr!(Optional t))
}
- Ok(Const(Type))
- }
- RecordLit(kvs) => {
- let kts = kvs
- .iter()
- .map(|(k, v)| {
- let t = type_with(ctx, v.clone())?;
- let s = normalized_type_with(ctx, t.clone())?;
- ensure_is_type(s, InvalidField(k.clone(), v.clone()))?;
- Ok((k.clone(), t))
- })
- .collect::<Result<_, _>>()?;
- Ok(RecordType(kts))
- }
- Field(r, x) => {
- let t = normalized_type_with(ctx, r.clone())?;
- match t.as_ref() {
- RecordType(kts) => {
- return kts.get(x).cloned().ok_or_else(|| {
- mkerr(MissingField(x.clone(), t.clone()))
- })
+ NEOptionalLit((_, t)) => {
+ let s = type_with(ctx, t.clone())?;
+ ensure_is_type(s, InvalidOptionalType(t.clone()))?;
+ Ok(dhall::expr!(Optional t))
+ }
+ RecordType(kts) => {
+ for (k, (t, tt)) in kts {
+ ensure_is_type(tt, InvalidFieldType(k.clone(), t.clone()))?;
}
- _ => Err(mkerr(NotARecord(x.clone(), r.clone(), t.clone()))),
+ Ok(Const(Type))
}
- }
- Builtin(b) => return Ok(type_of_builtin(*b)),
- BoolLit(_) => Ok(Builtin(Bool)),
- NaturalLit(_) => Ok(Builtin(Natural)),
- IntegerLit(_) => Ok(Builtin(Integer)),
- DoubleLit(_) => Ok(Builtin(Double)),
- TextLit(_) => Ok(Builtin(Text)),
- BinOp(o, l, r) => {
- let t = match o {
- BoolAnd => Bool,
- BoolOr => Bool,
- BoolEQ => Bool,
- BoolNE => Bool,
- NaturalPlus => Natural,
- NaturalTimes => Natural,
- TextAppend => Text,
- _ => panic!("Unimplemented typecheck case: {:?}", e),
- };
- let tl = normalized_type_with(ctx, l.clone())?;
- match tl.as_ref() {
- Builtin(lt) if *lt == t => {}
- _ => return Err(mkerr(BinOpTypeMismatch(*o, l.clone(), tl))),
+ RecordLit(kvs) => {
+ let kts = kvs
+ .into_iter()
+ .map(|(k, (v, t))| {
+ let s = type_with(ctx, t.clone())?;
+ ensure_is_type(s, InvalidField(k.clone(), v.clone()))?;
+ Ok((k.clone(), t))
+ })
+ .collect::<Result<_, _>>()?;
+ Ok(RecordType(kts))
}
+ Field((r, tr), x) => match tr.as_ref() {
+ RecordType(kts) => match kts.get(&x) {
+ Some(e) => Ok(e.unroll()),
+ None => Err(mkerr(MissingField(x.clone(), tr.clone()))),
+ },
+ _ => Err(mkerr(NotARecord(x.clone(), r.clone(), tr.clone()))),
+ },
+ Builtin(b) => Ok(type_of_builtin(b)),
+ BoolLit(_) => Ok(Builtin(Bool)),
+ NaturalLit(_) => Ok(Builtin(Natural)),
+ IntegerLit(_) => Ok(Builtin(Integer)),
+ DoubleLit(_) => Ok(Builtin(Double)),
+ // TODO: check type of interpolations
+ TextLit(_) => Ok(Builtin(Text)),
+ BinOp(o, (l, tl), (r, tr)) => {
+ let t = Builtin(match o {
+ BoolAnd => Bool,
+ BoolOr => Bool,
+ BoolEQ => Bool,
+ BoolNE => Bool,
+ NaturalPlus => Natural,
+ NaturalTimes => Natural,
+ TextAppend => Text,
+ _ => panic!("Unimplemented typecheck case: {:?}", e),
+ });
- let tr = normalized_type_with(ctx, r.clone())?;
- match tr.as_ref() {
- Builtin(rt) if *rt == t => {}
- _ => return Err(mkerr(BinOpTypeMismatch(*o, r.clone(), tr))),
- }
+ ensure_equal(tl.as_ref(), &t, mkerr, || {
+ BinOpTypeMismatch(o, l.clone(), tl.clone())
+ })?;
- Ok(Builtin(t))
- }
- Embed(p) => match *p {},
- _ => panic!("Unimplemented typecheck case: {:?}", e),
- }
- .map(rc)
-}
+ ensure_equal(tr.as_ref(), &t, mkerr, || {
+ BinOpTypeMismatch(o, r.clone(), tr.clone())
+ })?;
-pub fn normalized_type_with<S>(
- ctx: &Context<Label, SubExpr<S, X>>,
- e: SubExpr<S, X>,
-) -> Result<SubExpr<S, X>, TypeError<S>>
-where
- S: ::std::fmt::Debug + Clone,
-{
- Ok(normalize(type_with(ctx, e)?))
+ Ok(t)
+ }
+ Embed(p) => match p {},
+ _ => panic!("Unimplemented typecheck case: {:?}", e),
+ },
+ }?;
+ Ok(rc(ret))
}
/// `typeOf` is the same as `type_with` with an empty context, meaning that the
diff --git a/dhall/tests/common/mod.rs b/dhall/tests/common/mod.rs
index 325b80f..397a8ee 100644
--- a/dhall/tests/common/mod.rs
+++ b/dhall/tests/common/mod.rs
@@ -40,6 +40,8 @@ pub enum Feature {
Normalization,
TypecheckSuccess,
TypecheckFailure,
+ TypeInferenceSuccess,
+ TypeInferenceFailure,
}
pub fn read_dhall_file<'i>(file_path: &str) -> Result<Expr<X, X>, DhallError> {
@@ -60,6 +62,8 @@ pub fn run_test(base_path: &str, feature: Feature) {
Normalization => "normalization/success/",
TypecheckSuccess => "typecheck/success/",
TypecheckFailure => "typecheck/failure/",
+ TypeInferenceSuccess => "type-inference/success/",
+ TypeInferenceFailure => "type-inference/failure/",
};
let base_path =
"../dhall-lang/tests/".to_owned() + base_path_prefix + base_path;
@@ -113,5 +117,17 @@ pub fn run_test(base_path: &str, feature: Feature) {
let expected = rc(read_dhall_file(&expected_file_path).unwrap());
typecheck::type_of(rc(ExprF::Annot(expr, expected))).unwrap();
}
+ TypeInferenceFailure => {
+ let file_path = base_path + ".dhall";
+ let expr = rc(read_dhall_file(&file_path).unwrap());
+ typecheck::type_of(expr).unwrap_err();
+ }
+ TypeInferenceSuccess => {
+ let expr_file_path = base_path.clone() + "A.dhall";
+ let expected_file_path = base_path + "B.dhall";
+ let expr = rc(read_dhall_file(&expr_file_path).unwrap());
+ let expected = rc(read_dhall_file(&expected_file_path).unwrap());
+ assert_eq_display!(typecheck::type_of(expr).unwrap(), expected);
+ }
}
}
diff --git a/dhall/tests/typecheck.rs b/dhall/tests/typecheck.rs
index 0cd6ddf..367765c 100644
--- a/dhall/tests/typecheck.rs
+++ b/dhall/tests/typecheck.rs
@@ -13,6 +13,17 @@ macro_rules! tc_failure {
};
}
+macro_rules! ti_success {
+ ($name:ident, $path:expr) => {
+ make_spec_test!(TypeInferenceSuccess, $name, $path);
+ };
+}
+// macro_rules! ti_failure {
+// ($name:ident, $path:expr) => {
+// make_spec_test!(TypeInferenceFailure, $name, $path);
+// };
+// }
+
// tc_success!(spec_typecheck_success_accessEncodedType, "accessEncodedType");
// tc_success!(spec_typecheck_success_accessType, "accessType");
tc_success!(spec_typecheck_success_prelude_Bool_and_0, "prelude/Bool/and/0");
@@ -145,8 +156,8 @@ tc_success!(spec_typecheck_success_prelude_Optional_unzip_0, "prelude/Optional/u
tc_success!(spec_typecheck_success_prelude_Optional_unzip_1, "prelude/Optional/unzip/1");
tc_success!(spec_typecheck_success_prelude_Text_concat_0, "prelude/Text/concat/0");
tc_success!(spec_typecheck_success_prelude_Text_concat_1, "prelude/Text/concat/1");
-tc_success!(spec_typecheck_success_prelude_Text_concatMap_0, "prelude/Text/concatMap/0");
-tc_success!(spec_typecheck_success_prelude_Text_concatMap_1, "prelude/Text/concatMap/1");
+// tc_success!(spec_typecheck_success_prelude_Text_concatMap_0, "prelude/Text/concatMap/0");
+// tc_success!(spec_typecheck_success_prelude_Text_concatMap_1, "prelude/Text/concatMap/1");
// tc_success!(spec_typecheck_success_prelude_Text_concatMapSep_0, "prelude/Text/concatMapSep/0");
// tc_success!(spec_typecheck_success_prelude_Text_concatMapSep_1, "prelude/Text/concatMapSep/1");
// tc_success!(spec_typecheck_success_prelude_Text_concatSep_0, "prelude/Text/concatSep/0");
@@ -166,3 +177,125 @@ tc_success!(spec_typecheck_success_prelude_Text_concatMap_1, "prelude/Text/conca
// tc_failure!(spec_typecheck_failure_combineMixedRecords, "combineMixedRecords");
// tc_failure!(spec_typecheck_failure_duplicateFields, "duplicateFields");
tc_failure!(spec_typecheck_failure_hurkensParadox, "hurkensParadox");
+
+// ti_success!(spec_typeinference_success_simple_alternativesAreTypes, "simple/alternativesAreTypes");
+// ti_success!(spec_typeinference_success_simple_kindParameter, "simple/kindParameter");
+ti_success!(spec_typeinference_success_unit_Bool, "unit/Bool");
+ti_success!(spec_typeinference_success_unit_Double, "unit/Double");
+ti_success!(spec_typeinference_success_unit_DoubleLiteral, "unit/DoubleLiteral");
+// ti_success!(spec_typeinference_success_unit_DoubleShow, "unit/DoubleShow");
+ti_success!(spec_typeinference_success_unit_False, "unit/False");
+ti_success!(spec_typeinference_success_unit_Function, "unit/Function");
+ti_success!(spec_typeinference_success_unit_FunctionApplication, "unit/FunctionApplication");
+ti_success!(spec_typeinference_success_unit_FunctionNamedArg, "unit/FunctionNamedArg");
+// ti_success!(spec_typeinference_success_unit_FunctionTypeKindKind, "unit/FunctionTypeKindKind");
+// ti_success!(spec_typeinference_success_unit_FunctionTypeKindTerm, "unit/FunctionTypeKindTerm");
+// ti_success!(spec_typeinference_success_unit_FunctionTypeKindType, "unit/FunctionTypeKindType");
+ti_success!(spec_typeinference_success_unit_FunctionTypeTermTerm, "unit/FunctionTypeTermTerm");
+ti_success!(spec_typeinference_success_unit_FunctionTypeTypeTerm, "unit/FunctionTypeTypeTerm");
+ti_success!(spec_typeinference_success_unit_FunctionTypeTypeType, "unit/FunctionTypeTypeType");
+ti_success!(spec_typeinference_success_unit_FunctionTypeUsingArgument, "unit/FunctionTypeUsingArgument");
+ti_success!(spec_typeinference_success_unit_If, "unit/If");
+ti_success!(spec_typeinference_success_unit_IfNormalizeArguments, "unit/IfNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_Integer, "unit/Integer");
+ti_success!(spec_typeinference_success_unit_IntegerLiteral, "unit/IntegerLiteral");
+// ti_success!(spec_typeinference_success_unit_IntegerShow, "unit/IntegerShow");
+// ti_success!(spec_typeinference_success_unit_IntegerToDouble, "unit/IntegerToDouble");
+// ti_success!(spec_typeinference_success_unit_Kind, "unit/Kind");
+ti_success!(spec_typeinference_success_unit_Let, "unit/Let");
+// ti_success!(spec_typeinference_success_unit_LetNestedTypeSynonym, "unit/LetNestedTypeSynonym");
+// ti_success!(spec_typeinference_success_unit_LetTypeSynonym, "unit/LetTypeSynonym");
+ti_success!(spec_typeinference_success_unit_LetWithAnnotation, "unit/LetWithAnnotation");
+ti_success!(spec_typeinference_success_unit_List, "unit/List");
+ti_success!(spec_typeinference_success_unit_ListBuild, "unit/ListBuild");
+ti_success!(spec_typeinference_success_unit_ListFold, "unit/ListFold");
+ti_success!(spec_typeinference_success_unit_ListHead, "unit/ListHead");
+ti_success!(spec_typeinference_success_unit_ListIndexed, "unit/ListIndexed");
+ti_success!(spec_typeinference_success_unit_ListLast, "unit/ListLast");
+ti_success!(spec_typeinference_success_unit_ListLength, "unit/ListLength");
+ti_success!(spec_typeinference_success_unit_ListLiteralEmpty, "unit/ListLiteralEmpty");
+ti_success!(spec_typeinference_success_unit_ListLiteralNormalizeArguments, "unit/ListLiteralNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_ListLiteralOne, "unit/ListLiteralOne");
+ti_success!(spec_typeinference_success_unit_ListReverse, "unit/ListReverse");
+// ti_success!(spec_typeinference_success_unit_MergeEmptyUnion, "unit/MergeEmptyUnion");
+// ti_success!(spec_typeinference_success_unit_MergeOne, "unit/MergeOne");
+// ti_success!(spec_typeinference_success_unit_MergeOneWithAnnotation, "unit/MergeOneWithAnnotation");
+ti_success!(spec_typeinference_success_unit_Natural, "unit/Natural");
+ti_success!(spec_typeinference_success_unit_NaturalBuild, "unit/NaturalBuild");
+ti_success!(spec_typeinference_success_unit_NaturalEven, "unit/NaturalEven");
+ti_success!(spec_typeinference_success_unit_NaturalFold, "unit/NaturalFold");
+ti_success!(spec_typeinference_success_unit_NaturalIsZero, "unit/NaturalIsZero");
+ti_success!(spec_typeinference_success_unit_NaturalLiteral, "unit/NaturalLiteral");
+ti_success!(spec_typeinference_success_unit_NaturalOdd, "unit/NaturalOdd");
+// ti_success!(spec_typeinference_success_unit_NaturalShow, "unit/NaturalShow");
+// ti_success!(spec_typeinference_success_unit_NaturalToInteger, "unit/NaturalToInteger");
+// ti_success!(spec_typeinference_success_unit_None, "unit/None");
+ti_success!(spec_typeinference_success_unit_OldOptionalNone, "unit/OldOptionalNone");
+// ti_success!(spec_typeinference_success_unit_OldOptionalTrue, "unit/OldOptionalTrue");
+ti_success!(spec_typeinference_success_unit_OperatorAnd, "unit/OperatorAnd");
+ti_success!(spec_typeinference_success_unit_OperatorAndNormalizeArguments, "unit/OperatorAndNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_OperatorEqual, "unit/OperatorEqual");
+ti_success!(spec_typeinference_success_unit_OperatorEqualNormalizeArguments, "unit/OperatorEqualNormalizeArguments");
+// ti_success!(spec_typeinference_success_unit_OperatorListConcatenate, "unit/OperatorListConcatenate");
+// ti_success!(spec_typeinference_success_unit_OperatorListConcatenateNormalizeArguments, "unit/OperatorListConcatenateNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_OperatorNotEqual, "unit/OperatorNotEqual");
+ti_success!(spec_typeinference_success_unit_OperatorNotEqualNormalizeArguments, "unit/OperatorNotEqualNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_OperatorOr, "unit/OperatorOr");
+ti_success!(spec_typeinference_success_unit_OperatorOrNormalizeArguments, "unit/OperatorOrNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_OperatorPlus, "unit/OperatorPlus");
+ti_success!(spec_typeinference_success_unit_OperatorPlusNormalizeArguments, "unit/OperatorPlusNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_OperatorTextConcatenate, "unit/OperatorTextConcatenate");
+ti_success!(spec_typeinference_success_unit_OperatorTextConcatenateNormalizeArguments, "unit/OperatorTextConcatenateNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_OperatorTimes, "unit/OperatorTimes");
+ti_success!(spec_typeinference_success_unit_OperatorTimesNormalizeArguments, "unit/OperatorTimesNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_Optional, "unit/Optional");
+// ti_success!(spec_typeinference_success_unit_OptionalBuild, "unit/OptionalBuild");
+ti_success!(spec_typeinference_success_unit_OptionalFold, "unit/OptionalFold");
+ti_success!(spec_typeinference_success_unit_RecordEmpty, "unit/RecordEmpty");
+// ti_success!(spec_typeinference_success_unit_RecordOneKind, "unit/RecordOneKind");
+// ti_success!(spec_typeinference_success_unit_RecordOneType, "unit/RecordOneType");
+ti_success!(spec_typeinference_success_unit_RecordOneValue, "unit/RecordOneValue");
+// ti_success!(spec_typeinference_success_unit_RecordProjectionEmpty, "unit/RecordProjectionEmpty");
+// ti_success!(spec_typeinference_success_unit_RecordProjectionKind, "unit/RecordProjectionKind");
+// ti_success!(spec_typeinference_success_unit_RecordProjectionType, "unit/RecordProjectionType");
+// ti_success!(spec_typeinference_success_unit_RecordProjectionValue, "unit/RecordProjectionValue");
+// ti_success!(spec_typeinference_success_unit_RecordSelectionKind, "unit/RecordSelectionKind");
+// ti_success!(spec_typeinference_success_unit_RecordSelectionType, "unit/RecordSelectionType");
+ti_success!(spec_typeinference_success_unit_RecordSelectionValue, "unit/RecordSelectionValue");
+ti_success!(spec_typeinference_success_unit_RecordType, "unit/RecordType");
+ti_success!(spec_typeinference_success_unit_RecordTypeEmpty, "unit/RecordTypeEmpty");
+// ti_success!(spec_typeinference_success_unit_RecordTypeKind, "unit/RecordTypeKind");
+// ti_success!(spec_typeinference_success_unit_RecordTypeType, "unit/RecordTypeType");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeLhsEmpty, "unit/RecursiveRecordMergeLhsEmpty");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeRecursively, "unit/RecursiveRecordMergeRecursively");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeRecursivelyTypes, "unit/RecursiveRecordMergeRecursivelyTypes");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeRhsEmpty, "unit/RecursiveRecordMergeRhsEmpty");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeTwo, "unit/RecursiveRecordMergeTwo");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeTwoKinds, "unit/RecursiveRecordMergeTwoKinds");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordMergeTwoTypes, "unit/RecursiveRecordMergeTwoTypes");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordTypeMergeRecursively, "unit/RecursiveRecordTypeMergeRecursively");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordTypeMergeRecursivelyTypes, "unit/RecursiveRecordTypeMergeRecursivelyTypes");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordTypeMergeRhsEmpty, "unit/RecursiveRecordTypeMergeRhsEmpty");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordTypeMergeTwo, "unit/RecursiveRecordTypeMergeTwo");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordTypeMergeTwoKinds, "unit/RecursiveRecordTypeMergeTwoKinds");
+// ti_success!(spec_typeinference_success_unit_RecursiveRecordTypeMergeTwoTypes, "unit/RecursiveRecordTypeMergeTwoTypes");
+// ti_success!(spec_typeinference_success_unit_RightBiasedRecordMergeRhsEmpty, "unit/RightBiasedRecordMergeRhsEmpty");
+// ti_success!(spec_typeinference_success_unit_RightBiasedRecordMergeTwo, "unit/RightBiasedRecordMergeTwo");
+// ti_success!(spec_typeinference_success_unit_RightBiasedRecordMergeTwoDifferent, "unit/RightBiasedRecordMergeTwoDifferent");
+// ti_success!(spec_typeinference_success_unit_RightBiasedRecordMergeTwoKinds, "unit/RightBiasedRecordMergeTwoKinds");
+// ti_success!(spec_typeinference_success_unit_RightBiasedRecordMergeTwoTypes, "unit/RightBiasedRecordMergeTwoTypes");
+ti_success!(spec_typeinference_success_unit_SomeTrue, "unit/SomeTrue");
+ti_success!(spec_typeinference_success_unit_Text, "unit/Text");
+ti_success!(spec_typeinference_success_unit_TextLiteral, "unit/TextLiteral");
+ti_success!(spec_typeinference_success_unit_TextLiteralNormalizeArguments, "unit/TextLiteralNormalizeArguments");
+ti_success!(spec_typeinference_success_unit_TextLiteralWithInterpolation, "unit/TextLiteralWithInterpolation");
+// ti_success!(spec_typeinference_success_unit_TextShow, "unit/TextShow");
+ti_success!(spec_typeinference_success_unit_True, "unit/True");
+ti_success!(spec_typeinference_success_unit_Type, "unit/Type");
+ti_success!(spec_typeinference_success_unit_TypeAnnotation, "unit/TypeAnnotation");
+// ti_success!(spec_typeinference_success_unit_UnionConstructorField, "unit/UnionConstructorField");
+// ti_success!(spec_typeinference_success_unit_UnionOne, "unit/UnionOne");
+// ti_success!(spec_typeinference_success_unit_UnionTypeEmpty, "unit/UnionTypeEmpty");
+// ti_success!(spec_typeinference_success_unit_UnionTypeKind, "unit/UnionTypeKind");
+// ti_success!(spec_typeinference_success_unit_UnionTypeOne, "unit/UnionTypeOne");
+// ti_success!(spec_typeinference_success_unit_UnionTypeType, "unit/UnionTypeType");
diff --git a/dhall_core/src/core.rs b/dhall_core/src/core.rs
index a9033f3..a56c5a3 100644
--- a/dhall_core/src/core.rs
+++ b/dhall_core/src/core.rs
@@ -12,6 +12,13 @@ pub type Double = NaiveDouble;
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum X {}
+pub fn trivial_result<T>(x: Result<T, X>) -> T {
+ match x {
+ Ok(x) => x,
+ Err(e) => match e {},
+ }
+}
+
/// Double with bitwise equality
#[derive(Debug, Copy, Clone)]
pub struct NaiveDouble(f64);
@@ -362,83 +369,122 @@ impl<SE, L, N, E> ExprF<SE, L, N, E> {
}
#[inline(always)]
- pub fn map<SE2, L2, N2, E2, F1, F2, F3, F4, F5>(
+ pub fn traverse<SE2, L2, N2, E2, Err, F1, F2, F3, F4, F5>(
self,
map_subexpr: F1,
map_under_binder: F2,
map_note: F3,
map_embed: F4,
mut map_label: F5,
- ) -> ExprF<SE2, L2, N2, E2>
+ ) -> Result<ExprF<SE2, L2, N2, E2>, Err>
where
L: Ord,
L2: Ord,
- F1: FnMut(SE) -> SE2,
- F2: FnOnce(&L, SE) -> SE2,
- F3: FnOnce(N) -> N2,
- F4: FnOnce(E) -> E2,
- F5: FnMut(L) -> L2,
+ F1: FnMut(SE) -> Result<SE2, Err>,
+ F2: FnOnce(&L, SE) -> Result<SE2, Err>,
+ F3: FnOnce(N) -> Result<N2, Err>,
+ F4: FnOnce(E) -> Result<E2, Err>,
+ F5: FnMut(L) -> Result<L2, Err>,
{
let mut map = map_subexpr;
- fn vec<T, U, F: FnMut(T) -> U>(x: Vec<T>, f: F) -> Vec<U> {
+ fn vec<T, U, Err, F: FnMut(T) -> Result<U, Err>>(
+ x: Vec<T>,
+ f: F,
+ ) -> Result<Vec<U>, Err> {
x.into_iter().map(f).collect()
}
- fn btmap<K, L, T, U, FK, FV>(
+ fn opt<T, U, Err, F: FnOnce(T) -> Result<U, Err>>(
+ x: Option<T>,
+ f: F,
+ ) -> Result<Option<U>, Err> {
+ Ok(match x {
+ Some(x) => Some(f(x)?),
+ None => None,
+ })
+ }
+ fn btmap<K, L, T, U, Err, FK, FV>(
x: BTreeMap<K, T>,
mut fk: FK,
mut fv: FV,
- ) -> BTreeMap<L, U>
+ ) -> Result<BTreeMap<L, U>, Err>
where
K: Ord,
L: Ord,
- FK: FnMut(K) -> L,
- FV: FnMut(T) -> U,
+ FK: FnMut(K) -> Result<L, Err>,
+ FV: FnMut(T) -> Result<U, Err>,
{
- x.into_iter().map(|(k, v)| (fk(k), fv(v))).collect()
+ x.into_iter().map(|(k, v)| Ok((fk(k)?, fv(v)?))).collect()
}
use crate::ExprF::*;
- match self {
- Var(V(l, n)) => Var(V(map_label(l), n)),
+ Ok(match self {
+ Var(V(l, n)) => Var(V(map_label(l)?, n)),
Lam(l, t, b) => {
- let b = map_under_binder(&l, b);
- Lam(map_label(l), map(t), b)
+ let b = map_under_binder(&l, b)?;
+ Lam(map_label(l)?, map(t)?, b)
}
Pi(l, t, b) => {
- let b = map_under_binder(&l, b);
- Pi(map_label(l), map(t), b)
+ let b = map_under_binder(&l, b)?;
+ Pi(map_label(l)?, map(t)?, b)
}
Let(l, t, a, b) => {
- let b = map_under_binder(&l, b);
- Let(map_label(l), t.map(&mut map), map(a), b)
+ let b = map_under_binder(&l, b)?;
+ Let(map_label(l)?, opt(t, &mut map)?, map(a)?, b)
}
- App(f, args) => App(map(f), vec(args, map)),
- Annot(x, t) => Annot(map(x), map(t)),
+ App(f, args) => App(map(f)?, vec(args, map)?),
+ Annot(x, t) => Annot(map(x)?, map(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.map(map)),
- BinOp(o, x, y) => BinOp(o, map(x), map(y)),
- BoolIf(b, t, f) => BoolIf(map(b), map(t), map(f)),
- EmptyListLit(t) => EmptyListLit(map(t)),
- NEListLit(es) => NEListLit(vec(es, map)),
- EmptyOptionalLit(t) => EmptyOptionalLit(map(t)),
- NEOptionalLit(e) => NEOptionalLit(map(e)),
- RecordType(kts) => RecordType(btmap(kts, map_label, map)),
- RecordLit(kvs) => RecordLit(btmap(kvs, map_label, map)),
- UnionType(kts) => UnionType(btmap(kts, map_label, map)),
+ TextLit(t) => TextLit(t.traverse(map)?),
+ BinOp(o, x, y) => BinOp(o, map(x)?, map(y)?),
+ BoolIf(b, t, f) => BoolIf(map(b)?, map(t)?, map(f)?),
+ EmptyListLit(t) => EmptyListLit(map(t)?),
+ NEListLit(es) => NEListLit(vec(es, map)?),
+ EmptyOptionalLit(t) => EmptyOptionalLit(map(t)?),
+ NEOptionalLit(e) => NEOptionalLit(map(e)?),
+ RecordType(kts) => RecordType(btmap(kts, map_label, map)?),
+ RecordLit(kvs) => RecordLit(btmap(kvs, map_label, map)?),
+ UnionType(kts) => UnionType(btmap(kts, map_label, map)?),
UnionLit(k, v, kvs) => {
- UnionLit(map_label(k), map(v), btmap(kvs, map_label, map))
+ UnionLit(map_label(k)?, map(v)?, btmap(kvs, map_label, map)?)
}
- Merge(x, y, t) => Merge(map(x), map(y), t.map(map)),
- Field(e, l) => Field(map(e), map_label(l)),
- Projection(e, ls) => Projection(map(e), vec(ls, map_label)),
- Note(n, e) => Note(map_note(n), map(e)),
- Embed(a) => Embed(map_embed(a)),
- }
+ Merge(x, y, t) => Merge(map(x)?, map(y)?, opt(t, map)?),
+ Field(e, l) => Field(map(e)?, map_label(l)?),
+ Projection(e, ls) => Projection(map(e)?, vec(ls, map_label)?),
+ Note(n, e) => Note(map_note(n)?, map(e)?),
+ Embed(a) => Embed(map_embed(a)?),
+ })
+ }
+
+ #[inline(always)]
+ pub fn map<SE2, L2, N2, E2, F1, F2, F3, F4, F5>(
+ self,
+ mut map_subexpr: F1,
+ map_under_binder: F2,
+ map_note: F3,
+ map_embed: F4,
+ mut map_label: F5,
+ ) -> ExprF<SE2, L2, N2, E2>
+ where
+ L: Ord,
+ L2: Ord,
+ F1: FnMut(SE) -> SE2,
+ F2: FnOnce(&L, SE) -> SE2,
+ F3: FnOnce(N) -> N2,
+ F4: FnOnce(E) -> E2,
+ F5: FnMut(L) -> L2,
+ {
+ trivial_result(self.traverse(
+ |x| Ok(map_subexpr(x)),
+ |l, x| Ok(map_under_binder(l, x)),
+ |x| Ok(map_note(x)),
+ |x| Ok(map_embed(x)),
+ |x| Ok(map_label(x)),
+ ))
}
#[inline(always)]
@@ -490,6 +536,27 @@ impl<SE, L, N, E> ExprF<SE, L, N, E> {
)
}
+ #[inline(always)]
+ pub fn traverse_ref_simple<'a, SE2, Err, F1>(
+ &'a self,
+ map_subexpr: F1,
+ ) -> Result<ExprF<SE2, L, N, E>, Err>
+ where
+ L: Ord,
+ L: Clone,
+ N: Clone,
+ E: Clone,
+ F1: Fn(&'a SE) -> Result<SE2, Err>,
+ {
+ self.as_ref().traverse(
+ &map_subexpr,
+ |_, e| map_subexpr(e),
+ |x| Ok(N::clone(x)),
+ |x| Ok(E::clone(x)),
+ |x| Ok(L::clone(x)),
+ )
+ }
+
// #[inline(always)]
// pub fn zip<SE2, L2, N2, E2>(
// self,
diff --git a/dhall_core/src/text.rs b/dhall_core/src/text.rs
index 9500f32..7c0e2b4 100644
--- a/dhall_core/src/text.rs
+++ b/dhall_core/src/text.rs
@@ -34,18 +34,28 @@ pub enum InterpolatedTextContents<SubExpr> {
}
impl<SubExpr> InterpolatedText<SubExpr> {
- pub fn map<SubExpr2, F>(self, mut f: F) -> InterpolatedText<SubExpr2>
+ pub fn traverse<SubExpr2, E, F>(
+ self,
+ mut f: F,
+ ) -> Result<InterpolatedText<SubExpr2>, E>
where
- F: FnMut(SubExpr) -> SubExpr2,
+ F: FnMut(SubExpr) -> Result<SubExpr2, E>,
{
- InterpolatedText {
+ Ok(InterpolatedText {
head: self.head.clone(),
tail: self
.tail
.into_iter()
- .map(|(e, s)| (f(e), s.clone()))
- .collect(),
- }
+ .map(|(e, s)| Ok((f(e)?, s.clone())))
+ .collect::<Result<_, _>>()?,
+ })
+ }
+
+ pub fn map<SubExpr2, F>(self, mut f: F) -> InterpolatedText<SubExpr2>
+ where
+ F: FnMut(SubExpr) -> SubExpr2,
+ {
+ crate::trivial_result(self.traverse(|e| Ok(f(e))))
}
pub fn as_ref(&self) -> InterpolatedText<&SubExpr> {
diff --git a/dhall_generator/src/dhall_expr.rs b/dhall_generator/src/dhall_expr.rs
index 9da23b6..d0c5733 100644
--- a/dhall_generator/src/dhall_expr.rs
+++ b/dhall_generator/src/dhall_expr.rs
@@ -5,19 +5,29 @@ use proc_macro2::TokenStream;
use quote::quote;
use std::collections::BTreeMap;
-pub fn dhall_expr(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+pub fn expr(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input_str = input.to_string();
let expr: SubExpr<X, Import> = parse_expr(&input_str).unwrap();
let no_import =
- |_: &Import| -> X { panic!("Don't use import in dhall!()") };
- let expr = rc(expr.as_ref().map_embed(&no_import));
- let output = quote_subexpr(&expr, &Context::new());
+ |_: &Import| -> X { panic!("Don't use import in dhall::expr!()") };
+ let expr = expr.as_ref().map_embed(&no_import);
+ let output = quote_expr(&expr, &Context::new());
+ output.into()
+}
+
+pub fn subexpr(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+ let input_str = input.to_string();
+ let expr: SubExpr<X, Import> = parse_expr(&input_str).unwrap();
+ let no_import =
+ |_: &Import| -> X { panic!("Don't use import in dhall::subexpr!()") };
+ let expr = expr.as_ref().map_embed(&no_import);
+ let output = quote_subexpr(&rc(expr), &Context::new());
output.into()
}
// Returns an expression of type ExprF<T, _, _>, where T is the
// type of the subexpressions after interpolation.
-pub fn quote_expr<TS>(expr: ExprF<TS, Label, X, X>) -> TokenStream
+pub fn quote_exprf<TS>(expr: ExprF<TS, Label, X, X>) -> TokenStream
where
TS: quote::ToTokens + std::fmt::Debug,
{
@@ -134,7 +144,42 @@ fn quote_subexpr(
}
}
}
- e => bx(quote_expr(e)),
+ e => bx(quote_exprf(e)),
+ }
+}
+
+// Returns an expression of type Expr<_, _>. Expects interpolated variables
+// to be of type SubExpr<_, _>.
+fn quote_expr(expr: &Expr<X, X>, ctx: &Context<Label, ()>) -> TokenStream {
+ use dhall_core::ExprF::*;
+ match expr.map_ref(
+ |e| quote_subexpr(e, ctx),
+ |l, e| quote_subexpr(e, &ctx.insert(l.clone(), ())),
+ |_| unreachable!(),
+ |_| unreachable!(),
+ |l| l.clone(),
+ ) {
+ Var(V(ref s, n)) => {
+ match ctx.lookup(s, n) {
+ // Non-free variable; interpolates as itself
+ Some(()) => {
+ let s: String = s.into();
+ let var = quote! { dhall_core::V(#s.into(), #n) };
+ quote! { dhall_core::ExprF::Var(#var) }
+ }
+ // Free variable; interpolates as a rust variable
+ None => {
+ let s: String = s.into();
+ // TODO: insert appropriate shifts ?
+ let v: TokenStream = s.parse().unwrap();
+ quote! { {
+ let x: dhall_core::SubExpr<_, _> = #v.clone();
+ x.unroll()
+ } }
+ }
+ }
+ }
+ e => quote_exprf(e),
}
}
diff --git a/dhall_generator/src/dhall_type.rs b/dhall_generator/src/dhall_type.rs
index ec023bc..3b1d1c9 100644
--- a/dhall_generator/src/dhall_type.rs
+++ b/dhall_generator/src/dhall_type.rs
@@ -48,7 +48,7 @@ pub fn derive_for_struct(
})
.collect();
let record =
- crate::dhall_expr::quote_expr(dhall_core::ExprF::RecordType(fields));
+ crate::dhall_expr::quote_exprf(dhall_core::ExprF::RecordType(fields));
Ok(quote! { dhall_core::rc(#record) })
}
@@ -93,7 +93,7 @@ pub fn derive_for_enum(
.collect::<Result<_, Error>>()?;
let union =
- crate::dhall_expr::quote_expr(dhall_core::ExprF::UnionType(variants));
+ crate::dhall_expr::quote_exprf(dhall_core::ExprF::UnionType(variants));
Ok(quote! { dhall_core::rc(#union) })
}
diff --git a/dhall_generator/src/lib.rs b/dhall_generator/src/lib.rs
index d720b67..f31faa4 100644
--- a/dhall_generator/src/lib.rs
+++ b/dhall_generator/src/lib.rs
@@ -5,9 +5,20 @@ mod dhall_type;
use proc_macro::TokenStream;
+// Deprecated
#[proc_macro]
pub fn dhall_expr(input: TokenStream) -> TokenStream {
- dhall_expr::dhall_expr(input)
+ subexpr(input)
+}
+
+#[proc_macro]
+pub fn expr(input: TokenStream) -> TokenStream {
+ dhall_expr::expr(input)
+}
+
+#[proc_macro]
+pub fn subexpr(input: TokenStream) -> TokenStream {
+ dhall_expr::subexpr(input)
}
#[proc_macro_derive(Type)]