LibWeb: Add stub implementation of HTMLOptionsCollection

This is a subtype of `DOM::HTMLCollection` that only holds
`HTMLOptionElement`s. In this stub implementation only `item`,
`namedItem` and `length`, inherited from HTMLCollection, are exposed.
This is good enough for applications that only read the collection.

Userland/Libraries/LibWeb/Bindings/WindowObjectHelper.h

@@ -159,6 +159,8 @@
 #include <LibWeb/Bindings/HTMLOptGroupElementPrototype.h>
 #include <LibWeb/Bindings/HTMLOptionElementConstructor.h>
 #include <LibWeb/Bindings/HTMLOptionElementPrototype.h>
+#include <LibWeb/Bindings/HTMLOptionsCollectionConstructor.h>
+#include <LibWeb/Bindings/HTMLOptionsCollectionPrototype.h>
 #include <LibWeb/Bindings/HTMLOutputElementConstructor.h>
 #include <LibWeb/Bindings/HTMLOutputElementPrototype.h>
 #include <LibWeb/Bindings/HTMLParagraphElementConstructor.h>
@@ -407,6 +409,7 @@
     ADD_WINDOW_OBJECT_INTERFACE(HTMLOListElement)                                                   \
     ADD_WINDOW_OBJECT_INTERFACE(HTMLOptGroupElement)                                                \
     ADD_WINDOW_OBJECT_INTERFACE(HTMLOptionElement)                                                  \
+    ADD_WINDOW_OBJECT_INTERFACE(HTMLOptionsCollection)                                              \
     ADD_WINDOW_OBJECT_INTERFACE(HTMLOutputElement)                                                  \
     ADD_WINDOW_OBJECT_INTERFACE(HTMLParagraphElement)                                               \
     ADD_WINDOW_OBJECT_INTERFACE(HTMLParamElement)                                                   \

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -172,6 +172,7 @@ set(SOURCES
     HTML/HTMLObjectElement.cpp
     HTML/HTMLOptGroupElement.cpp
     HTML/HTMLOptionElement.cpp
+    HTML/HTMLOptionsCollection.cpp
     HTML/HTMLOutputElement.cpp
     HTML/HTMLParagraphElement.cpp
     HTML/HTMLParamElement.cpp
@@ -522,6 +523,7 @@ libweb_js_wrapper(HTML/HTMLObjectElement)
 libweb_js_wrapper(HTML/HTMLOListElement)
 libweb_js_wrapper(HTML/HTMLOptGroupElement)
 libweb_js_wrapper(HTML/HTMLOptionElement)
+libweb_js_wrapper(HTML/HTMLOptionsCollection)
 libweb_js_wrapper(HTML/HTMLOutputElement)
 libweb_js_wrapper(HTML/HTMLParagraphElement)
 libweb_js_wrapper(HTML/HTMLParamElement)

Userland/Libraries/LibWeb/Forward.h

@@ -199,6 +199,7 @@ class HTMLObjectElement;
 class HTMLOListElement;
 class HTMLOptGroupElement;
 class HTMLOptionElement;
+class HTMLOptionsCollection;
 class HTMLOutputElement;
 class HTMLParagraphElement;
 class HTMLParamElement;
@@ -446,6 +447,7 @@ class HTMLObjectElementWrapper;
 class HTMLOListElementWrapper;
 class HTMLOptGroupElementWrapper;
 class HTMLOptionElementWrapper;
+class HTMLOptionsCollectionWrapper;
 class HTMLOutputElementWrapper;
 class HTMLParagraphElementWrapper;
 class HTMLParamElementWrapper;

Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/HTML/HTMLOptionsCollection.h>
+
+namespace Web::HTML {
+
+HTMLOptionsCollection::HTMLOptionsCollection(DOM::ParentNode& root, Function<bool(DOM::Element const&)> filter)
+    : DOM::HTMLCollection(root, move(filter))
+{
+}
+
+}

Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.h

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/HTMLCollection.h>
+
+namespace Web::HTML {
+
+class HTMLOptionsCollection final : public DOM::HTMLCollection {
+public:
+    using WrapperType = Bindings::HTMLOptionsCollectionWrapper;
+
+    static NonnullRefPtr<HTMLOptionsCollection> create(DOM::ParentNode& root, Function<bool(DOM::Element const&)> filter)
+    {
+        return adopt_ref(*new HTMLOptionsCollection(root, move(filter)));
+    }
+
+protected:
+    HTMLOptionsCollection(DOM::ParentNode& root, Function<bool(DOM::Element const&)> filter);
+};
+
+}
+
+namespace Web::Bindings {
+
+HTMLOptionsCollectionWrapper* wrap(JS::GlobalObject&, HTML::HTMLOptionsCollection&);
+
+}

Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.idl

@@ -0,0 +1,12 @@
+#import <DOM/HTMLCollection.idl>
+#import <HTML/HTMLOptionElement.idl>
+#import <HTML/HTMLOptGroupElement.idl>
+
+[Exposed=Window]
+interface HTMLOptionsCollection : HTMLCollection {
+    // [CEReactions] attribute unsigned long length; // shadows inherited length
+    // [CEReactions] setter undefined (unsigned long index, HTMLOptionElement? option);
+    // [CEReactions] undefined add((HTMLOptionElement or HTMLOptGroupElement) element, optional (HTMLElement or long)? before = null);
+    // [CEReactions] undefined remove(long index);
+    // attribute long selectedIndex;
+};