Split into modules

1 files changed, 42 insertions, 0 deletions

diff --git a/src/parser/event_parser/grammar/attributes.rs b/src/parser/event_parser/grammar/attributes.rs
new file mode 100644
index 000000000..c80f782ab
--- /dev/null
+++ b/src/parser/event_parser/grammar/attributes.rs
@@ -0,0 +1,42 @@
+use super::*;
+
+pub(super) fn inner_attributes(p: &mut Parser) {
+    many(p, |p| attribute(p, true))
+}
+
+pub(super) fn outer_attributes(_: &mut Parser) {
+}
+
+
+fn attribute(p: &mut Parser, inner: bool) -> bool {
+    let attr_start = inner && p.lookahead(&[POUND, EXCL, L_BRACK])
+        || !inner && p.lookahead(&[POUND, L_BRACK]);
+    if !attr_start {
+        return false;
+    }
+    node(p, ATTR, |p| {
+        p.bump_n(if inner { 3 } else { 2 });
+        meta_item(p) && p.expect(R_BRACK);
+    });
+    true
+}
+
+fn meta_item(p: &mut Parser) -> bool {
+    node_if(p, IDENT, META_ITEM, |p| {
+        if p.eat(EQ) {
+            if !expressions::literal(p) {
+                p.error()
+                    .message("expected literal")
+                    .emit();
+            }
+        } else if p.eat(L_PAREN) {
+            comma_list(p, R_PAREN, meta_item_inner);
+            p.expect(R_PAREN);
+        }
+    })
+}
+
+fn meta_item_inner(p: &mut Parser) -> bool {
+    meta_item(p) || expressions::literal(p)
+}
+