LibHTML: Implement the universal selector ("*")

Author: awesomekling

Libraries/LibHTML/CSS/Selector.h

@@ -9,6 +9,7 @@ class Selector {
     struct Component {
         enum class Type {
             Invalid,
+            Universal,
             TagName,
             Id,
             Class,

Libraries/LibHTML/CSS/SelectorEngine.cpp

@@ -30,6 +30,8 @@ bool matches(const Selector::Component& component, const Element& element)
     }
 
     switch (component.type) {
+    case Selector::Component::Type::Universal:
+        return true;
     case Selector::Component::Type::Id:
         return component.value == element.attribute("id");
     case Selector::Component::Type::Class:

Libraries/LibHTML/Dump.cpp

@@ -150,6 +150,9 @@ void dump_rule(const StyleRule& rule)
             case Selector::Component::Type::Invalid:
                 type_description = "Invalid";
                 break;
+            case Selector::Component::Type::Universal:
+                type_description = "Universal";
+                break;
             case Selector::Component::Type::Id:
                 type_description = "Id";
                 break;

Libraries/LibHTML/Parser/CSSParser.cpp

@@ -224,6 +224,12 @@ class CSSParser {
             consume_whitespace_or_comments();
         }
 
+        if (peek() == '*') {
+            type = Selector::Component::Type::Universal;
+            consume_one();
+            return Selector::Component { type, Selector::Component::PseudoClass::None, relation, String() };
+        }
+
         if (peek() == '.') {
             type = Selector::Component::Type::Class;
             consume_one();