servo/components/script/dom/html/htmltemplateelement.rs

/* 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::context::JSContext;
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),
        }
    }

    pub(crate) fn new(
        cx: &mut js::context::JSContext,
        local_name: LocalName,
        prefix: Option<Prefix>,
        document: &Document,
        proto: Option<HandleObject>,
    ) -> DomRoot<HTMLTemplateElement> {
        let n = Node::reflect_node_with_proto(
            cx,
            Box::new(HTMLTemplateElement::new_inherited(
                local_name, prefix, document,
            )),
            document,
            proto,
        );

        n.upcast::<Node>().set_weird_parser_insertion_mode();
        n
    }

    pub(crate) fn set_contents(&self, document_fragment: Option<&DocumentFragment>) {
        self.contents.set(document_fragment);
    }
}

#[expect(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/#attr-template-shadowrootslotassignment>
    make_enumerated_getter!(
        ShadowRootSlotAssignment,
        "shadowrootslotassignment",
        "named" | "manual",
        missing => "named",
        invalid => "named"
    );

    /// <https://html.spec.whatwg.org/multipage/#attr-template-shadowrootslotassignment>
    make_atomic_setter!(SetShadowRootSlotAssignment, "shadowrootslotassignment");

    /// <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, cx: &mut js::context::JSContext) -> DomRoot<DocumentFragment> {
        self.contents.or_init(|| {
            // https://html.spec.whatwg.org/multipage/#template-contents
            // Step 1. Let document be the template element's node document's appropriate template contents owner document.
            let doc = self.owner_document();
            // Step 2. Create a DocumentFragment object whose node document is document and host is the template element.
            let document_fragment = doc
                .appropriate_template_contents_owner_document(CanGc::from_cx(cx))
                .CreateDocumentFragment(cx);
            document_fragment.set_host(self.upcast());
            // Step 3. Set the template element's template contents to the newly created DocumentFragment object.
            document_fragment
        })
    }
}

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, cx: &mut JSContext, old_doc: &Document) {
        self.super_type().unwrap().adopting_steps(cx, old_doc);
        // Step 1.
        let doc = self
            .owner_document()
            .appropriate_template_contents_owner_document(CanGc::from_cx(cx));
        // Step 2.
        let content = self.Content(cx);
        Node::adopt(cx, content.upcast(), &doc);
    }

    /// <https://html.spec.whatwg.org/multipage/#the-template-element:concept-node-clone-ext>
    fn cloning_steps(
        &self,
        cx: &mut JSContext,
        copy: &Node,
        maybe_doc: Option<&Document>,
        clone_children: CloneChildrenFlag,
    ) {
        self.super_type()
            .unwrap()
            .cloning_steps(cx, copy, maybe_doc, clone_children);
        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(cx));
        let copy_contents_doc = copy_contents.owner_doc();
        for child in self.Content(cx).upcast::<Node>().children() {
            let copy_child = Node::clone(
                cx,
                &child,
                Some(&copy_contents_doc),
                CloneChildrenFlag::CloneChildren,
                None,
            );
            copy_contents.AppendChild(cx, &copy_child).unwrap();
        }
    }
}