Add generic params to impl blocks

crates/ra_hir/src/generics.rs

@@ -7,7 +7,7 @@
 
 use ra_syntax::ast::{self, NameOwner, TypeParamsOwner};
 
-use crate::{db::PersistentHirDatabase, Name, AsName, Function, Struct, Enum, Trait, Type};
+use crate::{db::PersistentHirDatabase, Name, AsName, Function, Struct, Enum, Trait, Type, ImplBlock};
 
 /// Data about a generic parameter (to a function, struct, impl, ...).
 #[derive(Clone, PartialEq, Eq, Debug)]
@@ -30,8 +30,9 @@ pub enum GenericDef {
     Enum(Enum),
     Trait(Trait),
     Type(Type),
+    ImplBlock(ImplBlock),
 }
-impl_froms!(GenericDef: Function, Struct, Enum, Trait, Type);
+impl_froms!(GenericDef: Function, Struct, Enum, Trait, Type, ImplBlock);
 
 impl GenericParams {
     pub(crate) fn generic_params_query(
@@ -45,6 +46,7 @@ pub(crate) fn generic_params_query(
             GenericDef::Enum(it) => generics.fill(&*it.source(db).1),
             GenericDef::Trait(it) => generics.fill(&*it.source(db).1),
             GenericDef::Type(it) => generics.fill(&*it.source(db).1),
+            GenericDef::ImplBlock(it) => generics.fill(&*it.source(db).1),
         }
 
         Arc::new(generics)

crates/ra_hir/src/impl_block.rs

@@ -13,7 +13,7 @@
     type_ref::TypeRef,
     ids::LocationCtx,
     resolve::Resolver,
-    ty::Ty,
+    ty::Ty, generics::GenericParams
 };
 
 use crate::code_model_api::{Module, ModuleSource};
@@ -38,7 +38,7 @@ pub fn get(&self, source: &ModuleSource, impl_id: ImplId) -> TreeArc<ast::ImplBl
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct ImplBlock {
     module: Module,
     impl_id: ImplId,
@@ -58,7 +58,7 @@ pub(crate) fn from_id(module: Module, impl_id: ImplId) -> ImplBlock {
     }
 
     /// Returns the syntax of the impl block
-    pub fn source(&self, db: &impl HirDatabase) -> (HirFileId, TreeArc<ast::ImplBlock>) {
+    pub fn source(&self, db: &impl PersistentHirDatabase) -> (HirFileId, TreeArc<ast::ImplBlock>) {
         let source_map = db.impls_in_module_source_map(self.module);
         let (file_id, source) = self.module.definition_source(db);
         (file_id, source_map.get(&source, self.impl_id))
@@ -72,11 +72,11 @@ pub fn module(&self) -> Module {
         self.module
     }
 
-    pub fn target_trait_ref(&self, db: &impl HirDatabase) -> Option<TypeRef> {
+    pub fn target_trait_ref(&self, db: &impl PersistentHirDatabase) -> Option<TypeRef> {
         db.impls_in_module(self.module).impls[self.impl_id].target_trait().cloned()
     }
 
-    pub fn target_type(&self, db: &impl HirDatabase) -> TypeRef {
+    pub fn target_type(&self, db: &impl PersistentHirDatabase) -> TypeRef {
         db.impls_in_module(self.module).impls[self.impl_id].target_type().clone()
     }
 
@@ -96,10 +96,14 @@ pub fn target_trait(&self, db: &impl HirDatabase) -> Option<Trait> {
         None
     }
 
-    pub fn items(&self, db: &impl HirDatabase) -> Vec<ImplItem> {
+    pub fn items(&self, db: &impl PersistentHirDatabase) -> Vec<ImplItem> {
         db.impls_in_module(self.module).impls[self.impl_id].items().to_vec()
     }
 
+    pub fn generic_params(&self, db: &impl PersistentHirDatabase) -> Arc<GenericParams> {
+        db.generic_params((*self).into())
+    }
+
     pub fn resolver(&self, db: &impl HirDatabase) -> Resolver {
         let r = self.module().resolver(db);
         // TODO: add generics

crates/ra_syntax/src/ast/generated.rs

@@ -1352,6 +1352,7 @@ fn to_owned(&self) -> TreeArc<ImplBlock> { TreeArc::cast(self.syntax.to_owned())
 }
 
 
+impl ast::TypeParamsOwner for ImplBlock {}
 impl ImplBlock {
     pub fn item_list(&self) -> Option<&ItemList> {
         super::child_opt(self)

crates/ra_syntax/src/grammar.ron

@@ -322,7 +322,7 @@ Grammar(
             ],
             options: ["TypeRef"]
         ),
-        "ImplBlock": (options: ["ItemList"]),
+        "ImplBlock": (options: ["ItemList"], traits: ["TypeParamsOwner"]),
 
         "ParenType": (options: ["TypeRef"]),
         "TupleType": ( collections: [["fields", "TypeRef"]] ),