script/dom/css/
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 super::cssfontfacerule::CSSFontFaceRule;
12use super::cssimportrule::CSSImportRule;
13use super::csskeyframerule::CSSKeyframeRule;
14use super::csskeyframesrule::CSSKeyframesRule;
15use super::csslayerblockrule::CSSLayerBlockRule;
16use super::csslayerstatementrule::CSSLayerStatementRule;
17use super::cssmediarule::CSSMediaRule;
18use super::cssnamespacerule::CSSNamespaceRule;
19use super::cssnesteddeclarations::CSSNestedDeclarations;
20use super::csspropertyrule::CSSPropertyRule;
21use super::cssstylerule::CSSStyleRule;
22use super::cssstylesheet::CSSStyleSheet;
23use super::csssupportsrule::CSSSupportsRule;
24use crate::dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleMethods;
25use crate::dom::bindings::inheritance::Castable;
26use crate::dom::bindings::reflector::Reflector;
27use crate::dom::bindings::root::{Dom, DomRoot};
28use crate::dom::bindings::str::DOMString;
29use crate::dom::window::Window;
30use crate::script_runtime::CanGc;
31
32#[dom_struct]
33pub(crate) struct CSSRule {
34    reflector_: Reflector,
35    parent_stylesheet: Dom<CSSStyleSheet>,
36
37    /// Whether the parentStyleSheet attribute should return null.
38    /// We keep parent_stylesheet in that case because insertRule needs it
39    /// for the stylesheet’s base URL and namespace prefixes.
40    parent_stylesheet_removed: Cell<bool>,
41}
42
43impl CSSRule {
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 if let Some(rule) = self.downcast::<CSSPropertyRule>() {
76            rule as &dyn SpecificCSSRule
77        } else {
78            unreachable!()
79        }
80    }
81
82    // Given a StyleCssRule, create a new instance of a derived class of
83    // CSSRule based on which rule it is
84    pub(crate) fn new_specific(
85        window: &Window,
86        parent_stylesheet: &CSSStyleSheet,
87        rule: StyleCssRule,
88        can_gc: CanGc,
89    ) -> DomRoot<CSSRule> {
90        // be sure to update the match in as_specific when this is updated
91        match rule {
92            StyleCssRule::Import(s) => {
93                DomRoot::upcast(CSSImportRule::new(window, parent_stylesheet, s, can_gc))
94            },
95            StyleCssRule::Style(s) => {
96                DomRoot::upcast(CSSStyleRule::new(window, parent_stylesheet, s, can_gc))
97            },
98            StyleCssRule::FontFace(s) => {
99                DomRoot::upcast(CSSFontFaceRule::new(window, parent_stylesheet, s, can_gc))
100            },
101            StyleCssRule::FontFeatureValues(_) => unimplemented!(),
102            StyleCssRule::CounterStyle(_) => unimplemented!(),
103            StyleCssRule::Keyframes(s) => {
104                DomRoot::upcast(CSSKeyframesRule::new(window, parent_stylesheet, s, can_gc))
105            },
106            StyleCssRule::Media(s) => {
107                DomRoot::upcast(CSSMediaRule::new(window, parent_stylesheet, s, can_gc))
108            },
109            StyleCssRule::Namespace(s) => {
110                DomRoot::upcast(CSSNamespaceRule::new(window, parent_stylesheet, s, can_gc))
111            },
112            StyleCssRule::Supports(s) => {
113                DomRoot::upcast(CSSSupportsRule::new(window, parent_stylesheet, s, can_gc))
114            },
115            StyleCssRule::Page(_) => unreachable!(),
116            StyleCssRule::Container(_) => unimplemented!(), // TODO
117            StyleCssRule::Document(_) => unimplemented!(),  // TODO
118            StyleCssRule::LayerBlock(s) => {
119                DomRoot::upcast(CSSLayerBlockRule::new(window, parent_stylesheet, s, can_gc))
120            },
121            StyleCssRule::LayerStatement(s) => DomRoot::upcast(CSSLayerStatementRule::new(
122                window,
123                parent_stylesheet,
124                s,
125                can_gc,
126            )),
127            StyleCssRule::FontPaletteValues(_) => unimplemented!(), // TODO
128            StyleCssRule::Property(s) => {
129                DomRoot::upcast(CSSPropertyRule::new(window, parent_stylesheet, s, can_gc))
130            },
131            StyleCssRule::Margin(_) => unimplemented!(), // TODO
132            StyleCssRule::Scope(_) => unimplemented!(),  // TODO
133            StyleCssRule::StartingStyle(_) => unimplemented!(), // TODO
134            StyleCssRule::PositionTry(_) => unimplemented!(), // TODO
135            StyleCssRule::CustomMedia(_) => unimplemented!(), // TODO
136            StyleCssRule::NestedDeclarations(s) => DomRoot::upcast(CSSNestedDeclarations::new(
137                window,
138                parent_stylesheet,
139                s,
140                can_gc,
141            )),
142        }
143    }
144
145    /// Sets owner sheet/rule to null
146    pub(crate) fn detach(&self) {
147        self.deparent();
148        // should set parent rule to None when we add parent rule support
149    }
150
151    /// Sets owner sheet to null (and does the same for all children)
152    pub(crate) fn deparent(&self) {
153        self.parent_stylesheet_removed.set(true);
154        // https://github.com/w3c/csswg-drafts/issues/722
155        // Spec doesn't ask us to do this, but it makes sense
156        // and browsers implement this behavior
157        self.as_specific().deparent_children();
158    }
159
160    pub(crate) fn parent_stylesheet(&self) -> &CSSStyleSheet {
161        &self.parent_stylesheet
162    }
163
164    pub(crate) fn shared_lock(&self) -> &SharedRwLock {
165        self.parent_stylesheet.shared_lock()
166    }
167
168    pub(crate) fn update_rule(&self, style_rule: &StyleCssRule, guard: &SharedRwLockReadGuard) {
169        match style_rule {
170            StyleCssRule::Import(s) => {
171                if let Some(rule) = self.downcast::<CSSImportRule>() {
172                    rule.update_rule(s.clone());
173                }
174            },
175            StyleCssRule::Style(s) => {
176                if let Some(rule) = self.downcast::<CSSStyleRule>() {
177                    rule.update_rule(s.clone(), guard);
178                }
179            },
180            StyleCssRule::FontFace(s) => {
181                if let Some(rule) = self.downcast::<CSSFontFaceRule>() {
182                    rule.update_rule(s.clone());
183                }
184            },
185            StyleCssRule::FontFeatureValues(_) => unimplemented!(),
186            StyleCssRule::CounterStyle(_) => unimplemented!(),
187            StyleCssRule::Keyframes(s) => {
188                if let Some(rule) = self.downcast::<CSSKeyframesRule>() {
189                    rule.update_rule(s.clone(), guard);
190                }
191            },
192            StyleCssRule::Media(s) => {
193                if let Some(rule) = self.downcast::<CSSMediaRule>() {
194                    rule.update_rule(s.clone(), guard);
195                }
196            },
197            StyleCssRule::Namespace(s) => {
198                if let Some(rule) = self.downcast::<CSSNamespaceRule>() {
199                    rule.update_rule(s.clone());
200                }
201            },
202            StyleCssRule::Supports(s) => {
203                if let Some(rule) = self.downcast::<CSSSupportsRule>() {
204                    rule.update_rule(s.clone(), guard);
205                }
206            },
207            StyleCssRule::Page(_) => unreachable!(),
208            StyleCssRule::Container(_) => unimplemented!(), // TODO
209            StyleCssRule::Document(_) => unimplemented!(),  // TODO
210            StyleCssRule::LayerBlock(s) => {
211                if let Some(rule) = self.downcast::<CSSLayerBlockRule>() {
212                    rule.update_rule(s.clone(), guard);
213                }
214            },
215            StyleCssRule::LayerStatement(s) => {
216                if let Some(rule) = self.downcast::<CSSLayerStatementRule>() {
217                    rule.update_rule(s.clone());
218                }
219            },
220            StyleCssRule::FontPaletteValues(_) => unimplemented!(), // TODO
221            StyleCssRule::Property(s) => {
222                if let Some(rule) = self.downcast::<CSSPropertyRule>() {
223                    rule.update_rule(s.clone());
224                }
225            },
226            StyleCssRule::Margin(_) => unimplemented!(), // TODO
227            StyleCssRule::Scope(_) => unimplemented!(),  // TODO
228            StyleCssRule::StartingStyle(_) => unimplemented!(), // TODO
229            StyleCssRule::PositionTry(_) => unimplemented!(), // TODO
230            StyleCssRule::CustomMedia(_) => unimplemented!(), // TODO
231            StyleCssRule::NestedDeclarations(s) => {
232                if let Some(rule) = self.downcast::<CSSNestedDeclarations>() {
233                    rule.update_rule(s.clone(), guard);
234                }
235            },
236        }
237    }
238}
239
240impl CSSRuleMethods<crate::DomTypeHolder> for CSSRule {
241    /// <https://drafts.csswg.org/cssom/#dom-cssrule-type>
242    fn Type(&self) -> u16 {
243        let rule_type = self.as_specific().ty() as u16;
244        // Per https://drafts.csswg.org/cssom/#dom-cssrule-type for constants > 15
245        // we return 0.
246        if rule_type > 15 { 0 } else { rule_type }
247    }
248
249    /// <https://drafts.csswg.org/cssom/#dom-cssrule-parentstylesheet>
250    fn GetParentStyleSheet(&self) -> Option<DomRoot<CSSStyleSheet>> {
251        if self.parent_stylesheet_removed.get() {
252            None
253        } else {
254            Some(DomRoot::from_ref(&*self.parent_stylesheet))
255        }
256    }
257
258    /// <https://drafts.csswg.org/cssom/#dom-cssrule-csstext>
259    fn CssText(&self) -> DOMString {
260        self.as_specific().get_css()
261    }
262
263    /// <https://drafts.csswg.org/cssom/#dom-cssrule-csstext>
264    fn SetCssText(&self, _: DOMString) {
265        // do nothing
266    }
267}
268
269pub(crate) trait SpecificCSSRule {
270    fn ty(&self) -> CssRuleType;
271    fn get_css(&self) -> DOMString;
272    /// Remove parentStylesheet from all transitive children
273    fn deparent_children(&self) {
274        // most CSSRules do nothing here
275    }
276}
script/dom/css/cssrule.rs

script/dom/css/
cssrule.rs
