Move "is universal" logic from stylist.rs to selectors/parser.rs

components/selectors/parser.rs

@@ -182,6 +182,18 @@ pub struct Selector<Impl: SelectorImpl> {
     pub specificity: u32,
 }
 
+impl<Impl: SelectorImpl> Selector<Impl> {
+    /// Whether this selector (pseudo-element part excluded) matches every element.
+    ///
+    /// Used for "pre-computed" pseudo-elements in components/style/stylist.rs
+    pub fn is_universal(&self) -> bool {
+        self.inner.complex.iter_raw().all(|c| matches!(*c,
+            Component::ExplicitUniversalType |
+            Component::ExplicitAnyNamespace
+        ))
+    }
+}
+
 pub trait SelectorMethods {
     type Impl: SelectorImpl;
 

components/style/stylist.rs

@@ -1366,20 +1366,9 @@ impl SelectorMap<Rule> {
 
         let mut rules_list = vec![];
         for rule in self.other.iter() {
-            let mut iter = rule.selector.inner.complex.iter_raw();
-            match iter.next() {
-                None => {}
-                Some(&Component::ExplicitUniversalType) => match iter.next() {
-                    None => {}
-                    Some(&Component::ExplicitAnyNamespace) => match iter.next() {
-                        None => {}
-                        _ => continue
-                    },
-                    _ => continue
-                },
-                _ => continue
+            if rule.selector.is_universal() {
+                rules_list.push(rule.to_applicable_declaration_block(cascade_level))
             }
-            rules_list.push(rule.to_applicable_declaration_block(cascade_level))
         }
 
         sort_by_key(&mut rules_list,

tests/unit/style/stylist.rs

@@ -212,9 +212,9 @@ fn test_insert() {
 #[test]
 fn test_get_universal_rules() {
     thread_state::initialize(thread_state::LAYOUT);
-    let (map, shared_lock) = get_mock_map(&["*|*", "#foo > *|*", ".klass", "#id"]);
+    let (map, shared_lock) = get_mock_map(&["*|*", "#foo > *|*", "*|* > *|*", ".klass", "#id"]);
 
     let decls = map.get_universal_rules(CascadeLevel::UserNormal);
 
-    assert_eq!(decls.len(), 1);
+    assert_eq!(decls.len(), 1, "{:?}", decls);
 }