Add AST for extern crate

Also change it to parse the crate name as a NAME_REF, not a NAME.

3 files changed, 13 insertions, 3 deletions

diff --git a/crates/ra_syntax/src/ast/generated.rs b/crates/ra_syntax/src/ast/generated.rs
index 60480c699..a8d60e882 100644
--- a/crates/ra_syntax/src/ast/generated.rs
+++ b/crates/ra_syntax/src/ast/generated.rs
@@ -970,7 +970,15 @@ impl ToOwned for ExternCrateItem {
 }
 
 
-impl ExternCrateItem {}
+impl ExternCrateItem {
+    pub fn name_ref(&self) -> Option<&NameRef> {
+        super::child_opt(self)
+    }
+
+    pub fn alias(&self) -> Option<&Alias> {
+        super::child_opt(self)
+    }
+}
 
 // FalseKw
 #[derive(Debug, PartialEq, Eq, Hash)]
diff --git a/crates/ra_syntax/src/grammar.ron b/crates/ra_syntax/src/grammar.ron
index a2ccd7cb9..2ed1fd1b8 100644
--- a/crates/ra_syntax/src/grammar.ron
+++ b/crates/ra_syntax/src/grammar.ron
@@ -601,7 +601,9 @@ Grammar(
         "UseTreeList": (
             collections: [["use_trees", "UseTree"]]
         ),
-        "ExternCrateItem": (),
+        "ExternCrateItem": (
+            options: ["NameRef", "Alias"],
+        ),
         "ArgList": (
             collections: [
                 ["args", "Expr"]
diff --git a/crates/ra_syntax/src/grammar/items.rs b/crates/ra_syntax/src/grammar/items.rs
index 18039cd3f..84c18a293 100644
--- a/crates/ra_syntax/src/grammar/items.rs
+++ b/crates/ra_syntax/src/grammar/items.rs
@@ -247,7 +247,7 @@ fn extern_crate_item(p: &mut Parser) {
     p.bump();
     assert!(p.at(CRATE_KW));
     p.bump();
-    name(p);
+    name_ref(p);
     opt_alias(p);
     p.expect(SEMI);
 }