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Less cloning and dynamic dispatch.

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This commit is contained in:
Simon Sapin 2016-04-04 21:14:57 +02:00
parent 7d7aac212b
commit dc829da07e
3 changed files with 63 additions and 40 deletions
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16
components/script/dom/cssstyledeclaration.rs
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@ -13,6 +13,8 @@ use dom::element::{Element, StylePriority};
use dom::node::{Node, window_from_node};
use dom::window::Window;
use std::ascii::AsciiExt;
use std::cell::Ref;
use std::slice;
use string_cache::Atom;
use style::parser::ParserContextExtraData;
use style::properties::{PropertyDeclaration, Shorthand};
@ -140,14 +142,22 @@ impl CSSStyleDeclarationMethods for CSSStyleDeclaration {
// Step 2.2.2 & 2.2.3
match declaration {
Some(declaration) => list.push(declaration.clone()),
Some(declaration) => list.push(declaration),
None => return DOMString::new(),
}
}
// Step 2.3
let mut list = list.iter().map(|x| &*x);
let serialized_value = shorthand.serialize_shorthand_to_string(&mut list);
// Work around closures not being Clone
#[derive(Clone)]
struct Map<'a, 'b: 'a>(slice::Iter<'a, Ref<'b, PropertyDeclaration>>);
impl<'a, 'b> Iterator for Map<'a, 'b> {
type Item = &'a PropertyDeclaration;
fn next(&mut self) -> Option<Self::Item> {
self.0.next().map(|r| &**r)
}
}
let serialized_value = shorthand.serialize_shorthand_to_string(Map(list.iter()));
return DOMString::from(serialized_value);
}