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-rw-r--r--crates/ra_hir_ty/src/lib.rs63
1 files changed, 56 insertions, 7 deletions
diff --git a/crates/ra_hir_ty/src/lib.rs b/crates/ra_hir_ty/src/lib.rs
index 2b9372b4b..f22232324 100644
--- a/crates/ra_hir_ty/src/lib.rs
+++ b/crates/ra_hir_ty/src/lib.rs
@@ -73,6 +73,7 @@ pub use lower::{
73pub use traits::{InEnvironment, Obligation, ProjectionPredicate, TraitEnvironment}; 73pub use traits::{InEnvironment, Obligation, ProjectionPredicate, TraitEnvironment};
74 74
75pub use chalk_ir::{BoundVar, DebruijnIndex}; 75pub use chalk_ir::{BoundVar, DebruijnIndex};
76use itertools::Itertools;
76 77
77/// A type constructor or type name: this might be something like the primitive 78/// A type constructor or type name: this might be something like the primitive
78/// type `bool`, a struct like `Vec`, or things like function pointers or 79/// type `bool`, a struct like `Vec`, or things like function pointers or
@@ -815,6 +816,11 @@ impl Ty {
815 } 816 }
816 } 817 }
817 818
819 /// If this is a `dyn Trait`, returns that trait.
820 pub fn dyn_trait(&self) -> Option<TraitId> {
821 self.dyn_trait_ref().map(|it| it.trait_)
822 }
823
818 fn builtin_deref(&self) -> Option<Ty> { 824 fn builtin_deref(&self) -> Option<Ty> {
819 match self { 825 match self {
820 Ty::Apply(a_ty) => match a_ty.ctor { 826 Ty::Apply(a_ty) => match a_ty.ctor {
@@ -867,13 +873,56 @@ impl Ty {
867 } 873 }
868 } 874 }
869 875
870 /// If this is a `dyn Trait`, returns that trait. 876 pub fn impl_trait_bounds(&self, db: &dyn HirDatabase) -> Option<Vec<GenericPredicate>> {
871 pub fn dyn_trait(&self) -> Option<TraitId> {
872 match self { 877 match self {
873 Ty::Dyn(predicates) => predicates.iter().find_map(|pred| match pred { 878 Ty::Opaque(opaque_ty) => {
874 GenericPredicate::Implemented(tr) => Some(tr.trait_), 879 let predicates = match opaque_ty.opaque_ty_id {
875 _ => None, 880 OpaqueTyId::ReturnTypeImplTrait(func, idx) => {
876 }), 881 db.return_type_impl_traits(func).map(|it| {
882 let data = (*it)
883 .as_ref()
884 .map(|rpit| rpit.impl_traits[idx as usize].bounds.clone());
885 data.clone().subst(&opaque_ty.parameters)
886 })
887 }
888 };
889
890 predicates.map(|it| it.value)
891 }
892 Ty::Placeholder(id) => {
893 let generic_params = db.generic_params(id.parent);
894 let param_data = &generic_params.types[id.local_id];
895 match param_data.provenance {
896 hir_def::generics::TypeParamProvenance::ArgumentImplTrait => {
897 let predicates = db
898 .generic_predicates_for_param(*id)
899 .into_iter()
900 .map(|pred| pred.value.clone())
901 .collect_vec();
902
903 Some(predicates)
904 }
905 _ => None,
906 }
907 }
908 _ => None,
909 }
910 }
911
912 pub fn associated_type_parent_trait(&self, db: &dyn HirDatabase) -> Option<TraitId> {
913 match self {
914 Ty::Apply(ApplicationTy { ctor: TypeCtor::AssociatedType(type_alias_id), .. }) => {
915 match type_alias_id.lookup(db.upcast()).container {
916 AssocContainerId::TraitId(trait_id) => Some(trait_id),
917 _ => None,
918 }
919 }
920 Ty::Projection(projection_ty) => {
921 match projection_ty.associated_ty.lookup(db.upcast()).container {
922 AssocContainerId::TraitId(trait_id) => Some(trait_id),
923 _ => None,
924 }
925 }
877 _ => None, 926 _ => None,
878 } 927 }
879 } 928 }
@@ -1057,5 +1106,5 @@ pub struct ReturnTypeImplTraits {
1057 1106
1058#[derive(Clone, PartialEq, Eq, Debug, Hash)] 1107#[derive(Clone, PartialEq, Eq, Debug, Hash)]
1059pub(crate) struct ReturnTypeImplTrait { 1108pub(crate) struct ReturnTypeImplTrait {
1060 pub(crate) bounds: Binders<Vec<GenericPredicate>>, 1109 pub bounds: Binders<Vec<GenericPredicate>>,
1061} 1110}