Parse interfaces implementing interfaces

src/Language/GraphQL/AST/Document.hs

@@ -482,12 +482,9 @@ instance Monoid Description
 data TypeDefinition
     = ScalarTypeDefinition Description Name [Directive]
     | ObjectTypeDefinition
-        Description
-        Name
-        (ImplementsInterfaces [])
-        [Directive]
-        [FieldDefinition]
-    | InterfaceTypeDefinition Description Name [Directive] [FieldDefinition]
+        Description Name (ImplementsInterfaces []) [Directive] [FieldDefinition]
+    | InterfaceTypeDefinition
+        Description Name (ImplementsInterfaces []) [Directive] [FieldDefinition]
     | UnionTypeDefinition Description Name [Directive] (UnionMemberTypes [])
     | EnumTypeDefinition Description Name [Directive] [EnumValueDefinition]
     | InputObjectTypeDefinition

src/Language/GraphQL/AST/Encoder.hs

@@ -226,10 +226,11 @@ typeDefinition formatter = \case
         <> optempty (directives formatter) directives'
         <> eitherFormat formatter " " ""
         <> bracesList formatter (fieldDefinition nextFormatter) fields'
-    Full.InterfaceTypeDefinition description' name' directives' fields'
+    Full.InterfaceTypeDefinition description' name' ifaces' directives' fields'
         -> optempty (description formatter) description'
         <> "interface "
         <> Lazy.Text.fromStrict name'
+        <> optempty (" " <>) (implementsInterfaces ifaces')
         <> optempty (directives formatter) directives'
         <> eitherFormat formatter " " ""
         <> bracesList formatter (fieldDefinition nextFormatter) fields'

src/Language/GraphQL/AST/Parser.hs

@@ -214,6 +214,7 @@ interfaceTypeDefinition :: Full.Description -> Parser Full.TypeDefinition
 interfaceTypeDefinition description' = Full.InterfaceTypeDefinition description'
     <$ symbol "interface"
     <*> name
+    <*> option (Full.ImplementsInterfaces []) (implementsInterfaces sepBy1)
     <*> directives
     <*> braces (many fieldDefinition)
     <?> "InterfaceTypeDefinition"

src/Language/GraphQL/Validate.hs

@@ -210,7 +210,7 @@ typeDefinition context rule = \case
     Full.ObjectTypeDefinition _ _ _ directives' fields
         -> directives context rule objectLocation directives'
         >< foldMap (fieldDefinition context rule) fields
-    Full.InterfaceTypeDefinition _ _ directives' fields
+    Full.InterfaceTypeDefinition _ _ _ directives' fields
         -> directives context rule interfaceLocation directives'
         >< foldMap (fieldDefinition context rule) fields
     Full.UnionTypeDefinition _ _ directives' _ ->