LibWeb: Add HTML::Window::cached_web_prototype()

This is a simpler version of ensure_web_prototype<T>(). This new version
assumes that we already have a cached instance of the prototype.

2 files changed, 12 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index fd8b068f32..6907e41210 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -123,6 +123,16 @@ void Window::visit_edges(JS::Cell::Visitor& visitor)
 
 Window::~Window() = default;
 
+JS::Object& Window::cached_web_prototype(String const& class_name)
+{
+    auto it = m_prototypes.find(class_name);
+    if (it == m_prototypes.end()) {
+        dbgln("Missing prototype: {}", class_name);
+    }
+    VERIFY(it != m_prototypes.end());
+    return *it->value;
+}
+
 HighResolutionTime::Performance& Window::performance()
 {
     if (!m_performance)
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index 736bfdf5fd..00a33f37a2 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -169,6 +169,8 @@ public:
     JS::Object* web_prototype(String const& class_name) { return m_prototypes.get(class_name).value_or(nullptr); }
     JS::NativeFunction* web_constructor(String const& class_name) { return m_constructors.get(class_name).value_or(nullptr); }
 
+    JS::Object& cached_web_prototype(String const& class_name);
+
     template<typename T>
     JS::Object& ensure_web_prototype(String const& class_name)
     {