script/dom/
cssrule.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use std::cell::Cell;
6
7use dom_struct::dom_struct;
8use style::shared_lock::{SharedRwLock, SharedRwLockReadGuard};
9use style::stylesheets::{CssRule as StyleCssRule, CssRuleType};
10
11use crate::dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleMethods;
12use crate::dom::bindings::inheritance::Castable;
13use crate::dom::bindings::reflector::Reflector;
14use crate::dom::bindings::root::{Dom, DomRoot};
15use crate::dom::bindings::str::DOMString;
16use crate::dom::cssfontfacerule::CSSFontFaceRule;
17use crate::dom::cssimportrule::CSSImportRule;
18use crate::dom::csskeyframerule::CSSKeyframeRule;
19use crate::dom::csskeyframesrule::CSSKeyframesRule;
20use crate::dom::csslayerblockrule::CSSLayerBlockRule;
21use crate::dom::csslayerstatementrule::CSSLayerStatementRule;
22use crate::dom::cssmediarule::CSSMediaRule;
23use crate::dom::cssnamespacerule::CSSNamespaceRule;
24use crate::dom::cssnesteddeclarations::CSSNestedDeclarations;
25use crate::dom::cssstylerule::CSSStyleRule;
26use crate::dom::cssstylesheet::CSSStyleSheet;
27use crate::dom::csssupportsrule::CSSSupportsRule;
28use crate::dom::window::Window;
29use crate::script_runtime::CanGc;
30
31#[dom_struct]
32pub(crate) struct CSSRule {
33    reflector_: Reflector,
34    parent_stylesheet: Dom<CSSStyleSheet>,
35
36    /// Whether the parentStyleSheet attribute should return null.
37    /// We keep parent_stylesheet in that case because insertRule needs it
38    /// for the stylesheet’s base URL and namespace prefixes.
39    parent_stylesheet_removed: Cell<bool>,
40}
41
42impl CSSRule {
43    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
44    pub(crate) fn new_inherited(parent_stylesheet: &CSSStyleSheet) -> CSSRule {
45        CSSRule {
46            reflector_: Reflector::new(),
47            parent_stylesheet: Dom::from_ref(parent_stylesheet),
48            parent_stylesheet_removed: Cell::new(false),
49        }
50    }
51
52    pub(crate) fn as_specific(&self) -> &dyn SpecificCSSRule {
53        if let Some(rule) = self.downcast::<CSSStyleRule>() {
54            rule as &dyn SpecificCSSRule
55        } else if let Some(rule) = self.downcast::<CSSFontFaceRule>() {
56            rule as &dyn SpecificCSSRule
57        } else if let Some(rule) = self.downcast::<CSSKeyframesRule>() {
58            rule as &dyn SpecificCSSRule
59        } else if let Some(rule) = self.downcast::<CSSMediaRule>() {
60            rule as &dyn SpecificCSSRule
61        } else if let Some(rule) = self.downcast::<CSSNamespaceRule>() {
62            rule as &dyn SpecificCSSRule
63        } else if let Some(rule) = self.downcast::<CSSKeyframeRule>() {
64            rule as &dyn SpecificCSSRule
65        } else if let Some(rule) = self.downcast::<CSSImportRule>() {
66            rule as &dyn SpecificCSSRule
67        } else if let Some(rule) = self.downcast::<CSSSupportsRule>() {
68            rule as &dyn SpecificCSSRule
69        } else if let Some(rule) = self.downcast::<CSSLayerBlockRule>() {
70            rule as &dyn SpecificCSSRule
71        } else if let Some(rule) = self.downcast::<CSSLayerStatementRule>() {
72            rule as &dyn SpecificCSSRule
73        } else if let Some(rule) = self.downcast::<CSSNestedDeclarations>() {
74            rule as &dyn SpecificCSSRule
75        } else {
76            unreachable!()
77        }
78    }
79
80    // Given a StyleCssRule, create a new instance of a derived class of
81    // CSSRule based on which rule it is
82    pub(crate) fn new_specific(
83        window: &Window,
84        parent_stylesheet: &CSSStyleSheet,
85        rule: StyleCssRule,
86        can_gc: CanGc,
87    ) -> DomRoot<CSSRule> {
88        // be sure to update the match in as_specific when this is updated
89        match rule {
90            StyleCssRule::Import(s) => {
91                DomRoot::upcast(CSSImportRule::new(window, parent_stylesheet, s, can_gc))
92            },
93            StyleCssRule::Style(s) => {
94                DomRoot::upcast(CSSStyleRule::new(window, parent_stylesheet, s, can_gc))
95            },
96            StyleCssRule::FontFace(s) => {
97                DomRoot::upcast(CSSFontFaceRule::new(window, parent_stylesheet, s, can_gc))
98            },
99            StyleCssRule::FontFeatureValues(_) => unimplemented!(),
100            StyleCssRule::CounterStyle(_) => unimplemented!(),
101            StyleCssRule::Keyframes(s) => {
102                DomRoot::upcast(CSSKeyframesRule::new(window, parent_stylesheet, s, can_gc))
103            },
104            StyleCssRule::Media(s) => {
105                DomRoot::upcast(CSSMediaRule::new(window, parent_stylesheet, s, can_gc))
106            },
107            StyleCssRule::Namespace(s) => {
108                DomRoot::upcast(CSSNamespaceRule::new(window, parent_stylesheet, s, can_gc))
109            },
110            StyleCssRule::Supports(s) => {
111                DomRoot::upcast(CSSSupportsRule::new(window, parent_stylesheet, s, can_gc))
112            },
113            StyleCssRule::Page(_) => unreachable!(),
114            StyleCssRule::Container(_) => unimplemented!(), // TODO
115            StyleCssRule::Document(_) => unimplemented!(),  // TODO
116            StyleCssRule::LayerBlock(s) => {
117                DomRoot::upcast(CSSLayerBlockRule::new(window, parent_stylesheet, s, can_gc))
118            },
119            StyleCssRule::LayerStatement(s) => DomRoot::upcast(CSSLayerStatementRule::new(
120                window,
121                parent_stylesheet,
122                s,
123                can_gc,
124            )),
125            StyleCssRule::FontPaletteValues(_) => unimplemented!(), // TODO
126            StyleCssRule::Property(_) => unimplemented!(),          // TODO
127            StyleCssRule::Margin(_) => unimplemented!(),            // TODO
128            StyleCssRule::Scope(_) => unimplemented!(),             // TODO
129            StyleCssRule::StartingStyle(_) => unimplemented!(),     // TODO
130            StyleCssRule::PositionTry(_) => unimplemented!(),       // TODO
131            StyleCssRule::NestedDeclarations(s) => DomRoot::upcast(CSSNestedDeclarations::new(
132                window,
133                parent_stylesheet,
134                s,
135                can_gc,
136            )),
137        }
138    }
139
140    /// Sets owner sheet/rule to null
141    pub(crate) fn detach(&self) {
142        self.deparent();
143        // should set parent rule to None when we add parent rule support
144    }
145
146    /// Sets owner sheet to null (and does the same for all children)
147    pub(crate) fn deparent(&self) {
148        self.parent_stylesheet_removed.set(true);
149        // https://github.com/w3c/csswg-drafts/issues/722
150        // Spec doesn't ask us to do this, but it makes sense
151        // and browsers implement this behavior
152        self.as_specific().deparent_children();
153    }
154
155    pub(crate) fn parent_stylesheet(&self) -> &CSSStyleSheet {
156        &self.parent_stylesheet
157    }
158
159    pub(crate) fn shared_lock(&self) -> &SharedRwLock {
160        self.parent_stylesheet.shared_lock()
161    }
162
163    pub(crate) fn update_rule(&self, style_rule: &StyleCssRule, guard: &SharedRwLockReadGuard) {
164        match style_rule {
165            StyleCssRule::Import(s) => {
166                if let Some(rule) = self.downcast::<CSSImportRule>() {
167                    rule.update_rule(s.clone());
168                }
169            },
170            StyleCssRule::Style(s) => {
171                if let Some(rule) = self.downcast::<CSSStyleRule>() {
172                    rule.update_rule(s.clone(), guard);
173                }
174            },
175            StyleCssRule::FontFace(s) => {
176                if let Some(rule) = self.downcast::<CSSFontFaceRule>() {
177                    rule.update_rule(s.clone());
178                }
179            },
180            StyleCssRule::FontFeatureValues(_) => unimplemented!(),
181            StyleCssRule::CounterStyle(_) => unimplemented!(),
182            StyleCssRule::Keyframes(s) => {
183                if let Some(rule) = self.downcast::<CSSKeyframesRule>() {
184                    rule.update_rule(s.clone(), guard);
185                }
186            },
187            StyleCssRule::Media(s) => {
188                if let Some(rule) = self.downcast::<CSSMediaRule>() {
189                    rule.update_rule(s.clone(), guard);
190                }
191            },
192            StyleCssRule::Namespace(s) => {
193                if let Some(rule) = self.downcast::<CSSNamespaceRule>() {
194                    rule.update_rule(s.clone());
195                }
196            },
197            StyleCssRule::Supports(s) => {
198                if let Some(rule) = self.downcast::<CSSSupportsRule>() {
199                    rule.update_rule(s.clone(), guard);
200                }
201            },
202            StyleCssRule::Page(_) => unreachable!(),
203            StyleCssRule::Container(_) => unimplemented!(), // TODO
204            StyleCssRule::Document(_) => unimplemented!(),  // TODO
205            StyleCssRule::LayerBlock(s) => {
206                if let Some(rule) = self.downcast::<CSSLayerBlockRule>() {
207                    rule.update_rule(s.clone(), guard);
208                }
209            },
210            StyleCssRule::LayerStatement(s) => {
211                if let Some(rule) = self.downcast::<CSSLayerStatementRule>() {
212                    rule.update_rule(s.clone());
213                }
214            },
215            StyleCssRule::FontPaletteValues(_) => unimplemented!(), // TODO
216            StyleCssRule::Property(_) => unimplemented!(),          // TODO
217            StyleCssRule::Margin(_) => unimplemented!(),            // TODO
218            StyleCssRule::Scope(_) => unimplemented!(),             // TODO
219            StyleCssRule::StartingStyle(_) => unimplemented!(),     // TODO
220            StyleCssRule::PositionTry(_) => unimplemented!(),       // TODO
221            StyleCssRule::NestedDeclarations(s) => {
222                if let Some(rule) = self.downcast::<CSSNestedDeclarations>() {
223                    rule.update_rule(s.clone(), guard);
224                }
225            },
226        }
227    }
228}
229
230impl CSSRuleMethods<crate::DomTypeHolder> for CSSRule {
231    // https://drafts.csswg.org/cssom/#dom-cssrule-type
232    fn Type(&self) -> u16 {
233        let rule_type = self.as_specific().ty() as u16;
234        // Per https://drafts.csswg.org/cssom/#dom-cssrule-type for constants > 15
235        // we return 0.
236        if rule_type > 15 { 0 } else { rule_type }
237    }
238
239    // https://drafts.csswg.org/cssom/#dom-cssrule-parentstylesheet
240    fn GetParentStyleSheet(&self) -> Option<DomRoot<CSSStyleSheet>> {
241        if self.parent_stylesheet_removed.get() {
242            None
243        } else {
244            Some(DomRoot::from_ref(&*self.parent_stylesheet))
245        }
246    }
247
248    // https://drafts.csswg.org/cssom/#dom-cssrule-csstext
249    fn CssText(&self) -> DOMString {
250        self.as_specific().get_css()
251    }
252
253    // https://drafts.csswg.org/cssom/#dom-cssrule-csstext
254    fn SetCssText(&self, _: DOMString) {
255        // do nothing
256    }
257}
258
259pub(crate) trait SpecificCSSRule {
260    fn ty(&self) -> CssRuleType;
261    fn get_css(&self) -> DOMString;
262    /// Remove parentStylesheet from all transitive children
263    fn deparent_children(&self) {
264        // most CSSRules do nothing here
265    }
266}
script/dom/cssrule.rs

script/dom/
cssrule.rs
