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Add CSS.supports()

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This commit is contained in:
Manish Goregaokar 2017-01-02 00:11:27 -08:00
parent 56731dc6b5
commit 62bea28031
3 changed files with 34 additions and 4 deletions
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28
components/script/dom/css.rs
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@ -2,11 +2,14 @@
* 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 cssparser::serialize_identifier;
use cssparser::{Parser, serialize_identifier};
use dom::bindings::codegen::Bindings::WindowBinding::WindowBinding::WindowMethods;
use dom::bindings::error::Fallible;
use dom::bindings::reflector::Reflector;
use dom::bindings::str::DOMString;
use dom::window::Window;
use style::parser::ParserContext;
use style::supports::{Declaration, parse_condition_or_declaration};
#[dom_struct]
pub struct CSS {
@ -14,10 +17,31 @@ pub struct CSS {
}
impl CSS {
// http://dev.w3.org/csswg/cssom/#serialize-an-identifier
/// http://dev.w3.org/csswg/cssom/#serialize-an-identifier
pub fn Escape(_: &Window, ident: DOMString) -> Fallible<DOMString> {
let mut escaped = String::new();
serialize_identifier(&ident, &mut escaped).unwrap();
Ok(DOMString::from(escaped))
}
/// https://drafts.csswg.org/css-conditional/#dom-css-supports
pub fn Supports(win: &Window, property: DOMString, value: DOMString) -> bool {
let decl = Declaration { prop: property.into(), val: value.into() };
let url = win.Document().url();
let context = ParserContext::new_for_cssom(&url);
decl.eval(&context)
}
/// https://drafts.csswg.org/css-conditional/#dom-css-supports
pub fn Supports_(win: &Window, condition: DOMString) -> bool {
let mut input = Parser::new(&condition);
let cond = parse_condition_or_declaration(&mut input);
if let Ok(cond) = cond {
let url = win.Document().url();
let context = ParserContext::new_for_cssom(&url);
cond.eval(&context)
} else {
false
}
}
}