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/* 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 http://mozilla.org/MPL/2.0/. */
use dom::bindings::codegen::Bindings::CSSRuleBinding::CSSRuleMethods;
use dom::bindings::inheritance::Castable;
use dom::bindings::reflector::Reflector;
use dom::bindings::root::{Dom, DomRoot};
use dom::bindings::str::DOMString;
use dom::cssfontfacerule::CSSFontFaceRule;
use dom::cssimportrule::CSSImportRule;
use dom::csskeyframerule::CSSKeyframeRule;
use dom::csskeyframesrule::CSSKeyframesRule;
use dom::cssmediarule::CSSMediaRule;
use dom::cssnamespacerule::CSSNamespaceRule;
use dom::cssstylerule::CSSStyleRule;
use dom::cssstylesheet::CSSStyleSheet;
use dom::csssupportsrule::CSSSupportsRule;
use dom::cssviewportrule::CSSViewportRule;
use dom::window::Window;
use dom_struct::dom_struct;
use std::cell::Cell;
use style::shared_lock::SharedRwLock;
use style::stylesheets::CssRule as StyleCssRule;
#[dom_struct]
pub struct CSSRule {
reflector_: Reflector,
parent_stylesheet: Dom<CSSStyleSheet>,
/// Whether the parentStyleSheet attribute should return null.
/// We keep parent_stylesheet in that case because insertRule needs it
/// for the stylesheet’s base URL and namespace prefixes.
parent_stylesheet_removed: Cell<bool>,
}
impl CSSRule {
#[allow(unrooted_must_root)]
pub fn new_inherited(parent_stylesheet: &CSSStyleSheet) -> CSSRule {
CSSRule {
reflector_: Reflector::new(),
parent_stylesheet: Dom::from_ref(parent_stylesheet),
parent_stylesheet_removed: Cell::new(false),
}
}
pub fn as_specific(&self) -> &SpecificCSSRule {
if let Some(rule) = self.downcast::<CSSStyleRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSFontFaceRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSKeyframesRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSMediaRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSNamespaceRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSViewportRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSKeyframeRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSImportRule>() {
rule as &SpecificCSSRule
} else if let Some(rule) = self.downcast::<CSSSupportsRule>() {
rule as &SpecificCSSRule
} else {
unreachable!()
}
}
// Given a StyleCssRule, create a new instance of a derived class of
// CSSRule based on which rule it is
pub fn new_specific(window: &Window, parent_stylesheet: &CSSStyleSheet,
rule: StyleCssRule) -> DomRoot<CSSRule> {
// be sure to update the match in as_specific when this is updated
match rule {
StyleCssRule::Import(s) => DomRoot::upcast(CSSImportRule::new(window, parent_stylesheet, s)),
StyleCssRule::Style(s) => DomRoot::upcast(CSSStyleRule::new(window, parent_stylesheet, s)),
StyleCssRule::FontFace(s) => DomRoot::upcast(CSSFontFaceRule::new(window, parent_stylesheet, s)),
StyleCssRule::FontFeatureValues(_) => unimplemented!(),
StyleCssRule::CounterStyle(_) => unimplemented!(),
StyleCssRule::Keyframes(s) => DomRoot::upcast(CSSKeyframesRule::new(window, parent_stylesheet, s)),
StyleCssRule::Media(s) => DomRoot::upcast(CSSMediaRule::new(window, parent_stylesheet, s)),
StyleCssRule::Namespace(s) => DomRoot::upcast(CSSNamespaceRule::new(window, parent_stylesheet, s)),
StyleCssRule::Viewport(s) => DomRoot::upcast(CSSViewportRule::new(window, parent_stylesheet, s)),
StyleCssRule::Supports(s) => DomRoot::upcast(CSSSupportsRule::new(window, parent_stylesheet, s)),
StyleCssRule::Page(_) => unreachable!(),
StyleCssRule::Document(_) => unimplemented!(), // TODO
}
}
/// Sets owner sheet/rule to null
pub fn detach(&self) {
self.deparent();
// should set parent rule to None when we add parent rule support
}
/// Sets owner sheet to null (and does the same for all children)
pub fn deparent(&self) {
self.parent_stylesheet_removed.set(true);
// https://github.com/w3c/csswg-drafts/issues/722
// Spec doesn't ask us to do this, but it makes sense
// and browsers implement this behavior
self.as_specific().deparent_children();
}
pub fn parent_stylesheet(&self) -> &CSSStyleSheet {
&self.parent_stylesheet
}
pub fn shared_lock(&self) -> &SharedRwLock {
&self.parent_stylesheet.style_stylesheet().shared_lock
}
}
impl CSSRuleMethods for CSSRule {
// https://drafts.csswg.org/cssom/#dom-cssrule-type
fn Type(&self) -> u16 {
self.as_specific().ty()
}
// https://drafts.csswg.org/cssom/#dom-cssrule-parentstylesheet
fn GetParentStyleSheet(&self) -> Option<DomRoot<CSSStyleSheet>> {
if self.parent_stylesheet_removed.get() {
None
} else {
Some(DomRoot::from_ref(&*self.parent_stylesheet))
}
}
// https://drafts.csswg.org/cssom/#dom-cssrule-csstext
fn CssText(&self) -> DOMString {
self.as_specific().get_css()
}
// https://drafts.csswg.org/cssom/#dom-cssrule-csstext
fn SetCssText(&self, _: DOMString) {
// do nothing
}
}
pub trait SpecificCSSRule {
fn ty(&self) -> u16;
fn get_css(&self) -> DOMString;
/// Remove parentStylesheet from all transitive children
fn deparent_children(&self) {
// most CSSRules do nothing here
}
}
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