diff options
| -rw-r--r-- | README.md | 2 | ||||
| -rw-r--r-- | dhall/src/lib.rs | 2 | ||||
| -rw-r--r-- | dhall/src/typecheck.rs | 406 | ||||
| -rw-r--r-- | dhall/tests/common/mod.rs | 16 | ||||
| -rw-r--r-- | dhall/tests/typecheck.rs | 137 | ||||
| -rw-r--r-- | dhall_core/src/core.rs | 147 | ||||
| -rw-r--r-- | dhall_core/src/text.rs | 22 | ||||
| -rw-r--r-- | dhall_generator/src/dhall_expr.rs | 57 | ||||
| -rw-r--r-- | dhall_generator/src/dhall_type.rs | 4 | ||||
| -rw-r--r-- | dhall_generator/src/lib.rs | 13 |
10 files changed, 543 insertions, 263 deletions
@@ -12,7 +12,7 @@ This language is defined by a [standard](https://github.com/dhall-lang/dhall-lan - Parsing: 100% - Imports: 0% - Normalization: 74% -- Typechecking: 78% +- Typechecking: 66% You can see what's missing from the commented out tests in `dhall/tests`. 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)] |