LibHTML: Add a per-attribute callback for Elements to parse attributes

Elements now have a virtual parse_attribute(name, value) callback that
gets invoked for each one of its attributes.

2 files changed, 10 insertions, 0 deletions

diff --git a/Libraries/LibHTML/DOM/Element.cpp b/Libraries/LibHTML/DOM/Element.cpp
index c60319c075..2662562f4d 100644
--- a/Libraries/LibHTML/DOM/Element.cpp
+++ b/Libraries/LibHTML/DOM/Element.cpp
@@ -44,11 +44,16 @@ void Element::set_attribute(const String& name, const String& value)
         attribute->set_value(value);
     else
         m_attributes.empend(name, value);
+
+    parse_attribute(name, value);
 }
 
 void Element::set_attributes(Vector<Attribute>&& attributes)
 {
     m_attributes = move(attributes);
+
+    for (auto& attribute : m_attributes)
+        parse_attribute(attribute.name(), attribute.value());
 }
 
 bool Element::has_class(const StringView& class_name) const
@@ -80,3 +85,7 @@ RefPtr<LayoutNode> Element::create_layout_node(const StyleResolver& resolver, co
 
     ASSERT_NOT_REACHED();
 }
+
+void Element::parse_attribute(const String&, const String&)
+{
+}
diff --git a/Libraries/LibHTML/DOM/Element.h b/Libraries/LibHTML/DOM/Element.h
index a45f09ba4b..d6641e5496 100644
--- a/Libraries/LibHTML/DOM/Element.h
+++ b/Libraries/LibHTML/DOM/Element.h
@@ -43,6 +43,7 @@ public:
     bool has_class(const StringView&) const;
 
     virtual void apply_presentational_hints(StyleProperties&) const {}
+    virtual void parse_attribute(const String& name, const String& value);
 
 private:
     RefPtr<LayoutNode> create_layout_node(const StyleResolver&, const StyleProperties* parent_properties) const override;