From 49489dc20cc9f340d43acb467677b9bc59495ed2 Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Sun, 12 May 2019 17:53:44 +0200
Subject: Add basic infrastructure for assoc type projection

---
 crates/ra_hir/src/code_model.rs | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

(limited to 'crates/ra_hir/src/code_model.rs')

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 830aea1f3..4fbb1fc8f 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -779,6 +779,19 @@ impl Trait {
         self.trait_data(db).items().to_vec()
     }
 
+    pub fn associated_type_by_name(self, db: &impl DefDatabase, name: Name) -> Option<TypeAlias> {
+        let trait_data = self.trait_data(db);
+        trait_data
+            .items()
+            .iter()
+            .filter_map(|item| match item {
+                TraitItem::TypeAlias(t) => Some(*t),
+                _ => None,
+            })
+            .filter(|t| t.name(db) == name)
+            .next()
+    }
+
     pub(crate) fn trait_data(self, db: &impl DefDatabase) -> Arc<TraitData> {
         db.trait_data(self)
     }
@@ -831,8 +844,12 @@ impl TypeAlias {
         }
     }
 
-    pub fn type_ref(self, db: &impl DefDatabase) -> Arc<TypeRef> {
-        db.type_alias_ref(self)
+    pub fn type_ref(self, db: &impl DefDatabase) -> Option<TypeRef> {
+        db.type_alias_data(self).type_ref.clone()
+    }
+
+    pub fn name(self, db: &impl DefDatabase) -> Name {
+        db.type_alias_data(self).name.clone()
     }
 
     /// Builds a resolver for the type references in this type alias.
-- 
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