1 files changed, 31 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/grammar/attributes.rs b/crates/ra_syntax/src/grammar/attributes.rs
new file mode 100644
index 000000000..cd30e8a45
--- /dev/null
+++ b/crates/ra_syntax/src/grammar/attributes.rs
@@ -0,0 +1,31 @@
+use super::*;
+
+pub(super) fn inner_attributes(p: &mut Parser) {
+    while p.current() == POUND && p.nth(1) == EXCL {
+        attribute(p, true)
+    }
+}
+
+pub(super) fn outer_attributes(p: &mut Parser) {
+    while p.at(POUND) {
+        attribute(p, false)
+    }
+}
+
+fn attribute(p: &mut Parser, inner: bool) {
+    let attr = p.start();
+    assert!(p.at(POUND));
+    p.bump();
+
+    if inner {
+        assert!(p.at(EXCL));
+        p.bump();
+    }
+
+    if p.at(L_BRACK) {
+        items::token_tree(p);
+    } else {
+        p.error("expected `[`");
+    }
+    attr.complete(p, ATTR);
+}