feat(biome_graphql_parser): parse interface type extension (#2942)

crates/biome_graphql_parser/src/parser/definitions/interface.rs

@@ -1,7 +1,7 @@
 use crate::parser::{
     directive::{is_at_directive, DirectiveList},
     is_nth_at_name, parse_description,
-    parse_error::{expected_name, expected_named_type},
+    parse_error::{expected_name, expected_named_type, expected_object_extension},
     parse_name,
     r#type::parse_named_type,
     GraphqlParser,
@@ -10,7 +10,10 @@ use biome_graphql_syntax::{
     GraphqlSyntaxKind::{self, *},
     T,
 };
-use biome_parser::parse_lists::{ParseNodeList, ParseSeparatedList};
+use biome_parser::{
+    parse_lists::{ParseNodeList, ParseSeparatedList},
+    token_source::TokenSource,
+};
 use biome_parser::{
     parse_recovery::ParseRecovery, parsed_syntax::ParsedSyntax, prelude::ParsedSyntax::*, Parser,
 };
@@ -42,6 +45,31 @@ pub(super) fn parse_interface_type_definition(p: &mut GraphqlParser) -> ParsedSy
     Present(m.complete(p, GRAPHQL_INTERFACE_TYPE_DEFINITION))
 }
 
+/// Must only be called if the next 2 token is `extend` and `interface`, otherwise it will panic.
+#[inline]
+pub(super) fn parse_interface_type_extension(p: &mut GraphqlParser) -> ParsedSyntax {
+    let m = p.start();
+
+    p.bump(T![extend]);
+    p.bump(T![interface]);
+
+    parse_name(p).or_add_diagnostic(p, expected_name);
+
+    let implements_interface_empty = parse_implements_interface(p).is_absent();
+
+    let pos = p.source().position();
+    DirectiveList.parse_list(p);
+    let directive_empty = p.source().position() == pos;
+
+    let fields_definition_empty = parse_fields_definition(p).is_absent();
+
+    if directive_empty && implements_interface_empty && fields_definition_empty {
+        p.error(expected_object_extension(p, p.cur_range()));
+    }
+
+    Present(m.complete(p, GRAPHQL_INTERFACE_TYPE_EXTENSION))
+}
+
 #[inline]
 pub(super) fn parse_implements_interface(p: &mut GraphqlParser) -> ParsedSyntax {
     if !is_at_implements_interface(p) {

crates/biome_graphql_parser/src/parser/definitions/mod.rs

@@ -24,7 +24,7 @@ use self::{
     directive::parse_directive_definition,
     fragment::parse_fragment_definition,
     input_object::parse_input_object_type_definition,
-    interface::parse_interface_type_definition,
+    interface::{parse_interface_type_definition, parse_interface_type_extension},
     object::{parse_object_type_definition, parse_object_type_extension},
     operation::{parse_operation_definition, parse_selection_set},
     r#enum::parse_enum_type_definition,
@@ -99,6 +99,7 @@ fn parse_extension(p: &mut GraphqlParser) -> ParsedSyntax {
         T![schema] => parse_schema_extension(p),
         T![scalar] => parse_scalar_type_extension(p),
         T![type] => parse_object_type_extension(p),
+        T![interface] => parse_interface_type_extension(p),
         _ => Absent,
     }
 }

crates/biome_graphql_parser/tests/graphql_test_suite/err/definitions/interface_extension.graphql

@@ -0,0 +1,5 @@
+extend interface Story
+
+extend interface User
+  name: String
+}