script: Move HTML DOM interfaces to script/dom/html/ (#39046)

See #38901.

Testing: Refactor
Fixes: Partially #38901

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/script/dom/html/htmltemplateelement.rs

@@ -0,0 +1,155 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use dom_struct::dom_struct;
+use html5ever::{LocalName, Prefix};
+use js::rust::HandleObject;
+
+use crate::dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
+use crate::dom::bindings::codegen::Bindings::HTMLTemplateElementBinding::HTMLTemplateElementMethods;
+use crate::dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::root::{DomRoot, MutNullableDom};
+use crate::dom::bindings::str::DOMString;
+use crate::dom::document::Document;
+use crate::dom::documentfragment::DocumentFragment;
+use crate::dom::html::htmlelement::HTMLElement;
+use crate::dom::node::{CloneChildrenFlag, Node, NodeTraits};
+use crate::dom::virtualmethods::VirtualMethods;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct HTMLTemplateElement {
+    htmlelement: HTMLElement,
+
+    /// <https://html.spec.whatwg.org/multipage/#template-contents>
+    contents: MutNullableDom<DocumentFragment>,
+}
+
+impl HTMLTemplateElement {
+    fn new_inherited(
+        local_name: LocalName,
+        prefix: Option<Prefix>,
+        document: &Document,
+    ) -> HTMLTemplateElement {
+        HTMLTemplateElement {
+            htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
+            contents: MutNullableDom::new(None),
+        }
+    }
+
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new(
+        local_name: LocalName,
+        prefix: Option<Prefix>,
+        document: &Document,
+        proto: Option<HandleObject>,
+        can_gc: CanGc,
+    ) -> DomRoot<HTMLTemplateElement> {
+        let n = Node::reflect_node_with_proto(
+            Box::new(HTMLTemplateElement::new_inherited(
+                local_name, prefix, document,
+            )),
+            document,
+            proto,
+            can_gc,
+        );
+
+        n.upcast::<Node>().set_weird_parser_insertion_mode();
+        n
+    }
+
+    pub(crate) fn set_contents(&self, document_fragment: Option<&DocumentFragment>) {
+        self.contents.set(document_fragment);
+    }
+}
+
+#[allow(unused_doc_comments)]
+impl HTMLTemplateElementMethods<crate::DomTypeHolder> for HTMLTemplateElement {
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootmode>
+    make_enumerated_getter!(
+        ShadowRootMode,
+        "shadowrootmode",
+        "open" | "closed",
+        missing => "",
+        invalid => ""
+    );
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootmode>
+    make_atomic_setter!(SetShadowRootMode, "shadowrootmode");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootdelegatesfocus>
+    make_bool_getter!(ShadowRootDelegatesFocus, "shadowrootdelegatesfocus");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootdelegatesfocus>
+    make_bool_setter!(SetShadowRootDelegatesFocus, "shadowrootdelegatesfocus");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootclonable>
+    make_bool_getter!(ShadowRootClonable, "shadowrootclonable");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootclonable>
+    make_bool_setter!(SetShadowRootClonable, "shadowrootclonable");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootserializable>
+    make_bool_getter!(ShadowRootSerializable, "shadowrootserializable");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-shadowrootserializable>
+    make_bool_setter!(SetShadowRootSerializable, "shadowrootserializable");
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-template-content>
+    fn Content(&self, can_gc: CanGc) -> DomRoot<DocumentFragment> {
+        self.contents.or_init(|| {
+            let doc = self.owner_document();
+            doc.appropriate_template_contents_owner_document(can_gc)
+                .CreateDocumentFragment(can_gc)
+        })
+    }
+}
+
+impl VirtualMethods for HTMLTemplateElement {
+    fn super_type(&self) -> Option<&dyn VirtualMethods> {
+        Some(self.upcast::<HTMLElement>() as &dyn VirtualMethods)
+    }
+
+    /// <https://html.spec.whatwg.org/multipage/#template-adopting-steps>
+    fn adopting_steps(&self, old_doc: &Document, can_gc: CanGc) {
+        self.super_type().unwrap().adopting_steps(old_doc, can_gc);
+        // Step 1.
+        let doc = self
+            .owner_document()
+            .appropriate_template_contents_owner_document(CanGc::note());
+        // Step 2.
+        Node::adopt(self.Content(CanGc::note()).upcast(), &doc, can_gc);
+    }
+
+    /// <https://html.spec.whatwg.org/multipage/#the-template-element:concept-node-clone-ext>
+    fn cloning_steps(
+        &self,
+        copy: &Node,
+        maybe_doc: Option<&Document>,
+        clone_children: CloneChildrenFlag,
+        can_gc: CanGc,
+    ) {
+        self.super_type()
+            .unwrap()
+            .cloning_steps(copy, maybe_doc, clone_children, can_gc);
+        if clone_children == CloneChildrenFlag::DoNotCloneChildren {
+            // Step 1.
+            return;
+        }
+        let copy = copy.downcast::<HTMLTemplateElement>().unwrap();
+        // Steps 2-3.
+        let copy_contents = DomRoot::upcast::<Node>(copy.Content(CanGc::note()));
+        let copy_contents_doc = copy_contents.owner_doc();
+        for child in self.Content(CanGc::note()).upcast::<Node>().children() {
+            let copy_child = Node::clone(
+                &child,
+                Some(&copy_contents_doc),
+                CloneChildrenFlag::CloneChildren,
+                CanGc::note(),
+            );
+            copy_contents.AppendChild(&copy_child, can_gc).unwrap();
+        }
+    }
+}