jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2019-2022, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <LibWeb/Bindings/CSSStyleSheetPrototype.h>
8#include <LibWeb/Bindings/Intrinsics.h>
9#include <LibWeb/CSS/CSSStyleSheet.h>
10#include <LibWeb/CSS/Parser/Parser.h>
11#include <LibWeb/CSS/StyleSheetList.h>
12#include <LibWeb/DOM/Document.h>
13#include <LibWeb/WebIDL/ExceptionOr.h>
14
15namespace Web::CSS {
16
17WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSStyleSheet>> CSSStyleSheet::create(JS::Realm& realm, CSSRuleList& rules, MediaList& media, Optional<AK::URL> location)
18{
19 return MUST_OR_THROW_OOM(realm.heap().allocate<CSSStyleSheet>(realm, realm, rules, media, move(location)));
20}
21
22CSSStyleSheet::CSSStyleSheet(JS::Realm& realm, CSSRuleList& rules, MediaList& media, Optional<AK::URL> location)
23 : StyleSheet(realm, media)
24 , m_rules(&rules)
25{
26 if (location.has_value())
27 set_location(location->to_deprecated_string());
28
29 for (auto& rule : *m_rules)
30 rule.set_parent_style_sheet(this);
31}
32
33JS::ThrowCompletionOr<void> CSSStyleSheet::initialize(JS::Realm& realm)
34{
35 MUST_OR_THROW_OOM(Base::initialize(realm));
36 set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSStyleSheetPrototype>(realm, "CSSStyleSheet"));
37
38 return {};
39}
40
41void CSSStyleSheet::visit_edges(Cell::Visitor& visitor)
42{
43 Base::visit_edges(visitor);
44 visitor.visit(m_style_sheet_list.ptr());
45 visitor.visit(m_rules);
46 visitor.visit(m_owner_css_rule);
47}
48
49// https://www.w3.org/TR/cssom/#dom-cssstylesheet-insertrule
50WebIDL::ExceptionOr<unsigned> CSSStyleSheet::insert_rule(StringView rule, unsigned index)
51{
52 // FIXME: 1. If the origin-clean flag is unset, throw a SecurityError exception.
53
54 // FIXME: 2. If the disallow modification flag is set, throw a NotAllowedError DOMException.
55
56 // 3. Let parsed rule be the return value of invoking parse a rule with rule.
57 auto context = m_style_sheet_list ? CSS::Parser::ParsingContext { m_style_sheet_list->document() } : CSS::Parser::ParsingContext { realm() };
58 auto parsed_rule = parse_css_rule(context, rule);
59
60 // 4. If parsed rule is a syntax error, return parsed rule.
61 if (!parsed_rule)
62 return WebIDL::SyntaxError::create(realm(), "Unable to parse CSS rule.");
63
64 // FIXME: 5. If parsed rule is an @import rule, and the constructed flag is set, throw a SyntaxError DOMException.
65
66 // 6. Return the result of invoking insert a CSS rule rule in the CSS rules at index.
67 auto result = m_rules->insert_a_css_rule(parsed_rule, index);
68
69 if (!result.is_exception()) {
70 // NOTE: The spec doesn't say where to set the parent style sheet, so we'll do it here.
71 parsed_rule->set_parent_style_sheet(this);
72
73 if (m_style_sheet_list) {
74 m_style_sheet_list->document().style_computer().invalidate_rule_cache();
75 m_style_sheet_list->document().invalidate_style();
76 }
77 }
78
79 return result;
80}
81
82// https://www.w3.org/TR/cssom/#dom-cssstylesheet-deleterule
83WebIDL::ExceptionOr<void> CSSStyleSheet::delete_rule(unsigned index)
84{
85 // FIXME: 1. If the origin-clean flag is unset, throw a SecurityError exception.
86
87 // FIXME: 2. If the disallow modification flag is set, throw a NotAllowedError DOMException.
88
89 // 3. Remove a CSS rule in the CSS rules at index.
90 auto result = m_rules->remove_a_css_rule(index);
91 if (!result.is_exception()) {
92 if (m_style_sheet_list) {
93 m_style_sheet_list->document().style_computer().invalidate_rule_cache();
94 m_style_sheet_list->document().invalidate_style();
95 }
96 }
97 return result;
98}
99
100// https://www.w3.org/TR/cssom/#dom-cssstylesheet-removerule
101WebIDL::ExceptionOr<void> CSSStyleSheet::remove_rule(unsigned index)
102{
103 // The removeRule(index) method must run the same steps as deleteRule().
104 return delete_rule(index);
105}
106
107void CSSStyleSheet::for_each_effective_style_rule(Function<void(CSSStyleRule const&)> const& callback) const
108{
109 if (m_media.matches()) {
110 m_rules->for_each_effective_style_rule(callback);
111 }
112}
113
114bool CSSStyleSheet::evaluate_media_queries(HTML::Window const& window)
115{
116 bool any_media_queries_changed_match_state = false;
117
118 bool did_match = m_media.matches();
119 bool now_matches = m_media.evaluate(window);
120 if (did_match != now_matches)
121 any_media_queries_changed_match_state = true;
122 if (now_matches && m_rules->evaluate_media_queries(window))
123 any_media_queries_changed_match_state = true;
124
125 return any_media_queries_changed_match_state;
126}
127
128void CSSStyleSheet::set_style_sheet_list(Badge<StyleSheetList>, StyleSheetList* list)
129{
130 m_style_sheet_list = list;
131}
132
133}