jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <LibJS/Heap/Heap.h>
8#include <LibWeb/DOM/Document.h>
9#include <LibWeb/DOM/DocumentFragment.h>
10#include <LibWeb/DOMParsing/InnerHTML.h>
11#include <LibWeb/HTML/Parser/HTMLParser.h>
12#include <LibWeb/WebIDL/ExceptionOr.h>
13
14namespace Web::DOMParsing {
15
16// https://w3c.github.io/DOM-Parsing/#dfn-fragment-parsing-algorithm
17WebIDL::ExceptionOr<JS::NonnullGCPtr<DOM::DocumentFragment>> parse_fragment(DeprecatedString const& markup, DOM::Element& context_element)
18{
19 // FIXME: Handle XML documents.
20
21 auto& realm = context_element.realm();
22
23 auto new_children = HTML::HTMLParser::parse_html_fragment(context_element, markup);
24 auto fragment = MUST_OR_THROW_OOM(realm.heap().allocate<DOM::DocumentFragment>(realm, context_element.document()));
25
26 for (auto& child : new_children) {
27 // I don't know if this can throw here, but let's be safe.
28 (void)TRY(fragment->append_child(*child));
29 }
30
31 return fragment;
32}
33
34// https://w3c.github.io/DOM-Parsing/#dom-innerhtml-innerhtml
35WebIDL::ExceptionOr<void> inner_html_setter(JS::NonnullGCPtr<DOM::Node> context_object, DeprecatedString const& value)
36{
37 // 1. Let context element be the context object's host if the context object is a ShadowRoot object, or the context object otherwise.
38 // (This is handled in Element and ShadowRoot)
39 JS::NonnullGCPtr<DOM::Element> context_element = is<DOM::ShadowRoot>(*context_object) ? *verify_cast<DOM::ShadowRoot>(*context_object).host() : verify_cast<DOM::Element>(*context_object);
40
41 // 2. Let fragment be the result of invoking the fragment parsing algorithm with the new value as markup, and with context element.
42 auto fragment = TRY(parse_fragment(value, context_element));
43
44 // 3. If the context object is a template element, then let context object be the template's template contents (a DocumentFragment).
45 if (is<HTML::HTMLTemplateElement>(*context_object))
46 context_object = verify_cast<HTML::HTMLTemplateElement>(*context_object).content();
47
48 // 4. Replace all with fragment within the context object.
49 context_object->replace_all(fragment);
50
51 // NOTE: We don't invalidate style & layout for <template> elements since they don't affect rendering.
52 if (!is<HTML::HTMLTemplateElement>(*context_object)) {
53 context_object->set_needs_style_update(true);
54
55 // NOTE: Since the DOM has changed, we have to rebuild the layout tree.
56 context_object->document().invalidate_layout();
57 context_object->document().set_needs_layout();
58 }
59
60 return {};
61}
62
63}