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style: Avoid double hash lookup when inserting in OrderMap.

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This commit is contained in:
Emilio Cobos Álvarez 2018-02-05 03:18:28 +01:00
parent f2df3052d9
commit c72a5623b1
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GPG key ID: 056B727BB9C1027C
1 changed files with 14 additions and 5 deletions
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19
components/style/custom_properties.rs
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@ -8,6 +8,7 @@
use Atom;
use cssparser::{Delimiter, Parser, ParserInput, SourcePosition, Token, TokenSerializationType};
use hash::map::Entry;
use precomputed_hash::PrecomputedHash;
use properties::{CSSWideKeyword, DeclaredValue};
use selector_map::{PrecomputedHashSet, PrecomputedHashMap};
@ -105,11 +106,21 @@ where
}
/// Insert a new key-value pair.
///
/// TODO(emilio): Remove unused_mut when Gecko and Servo agree in whether
/// it's necessary.
#[allow(unused_mut)]
pub fn insert(&mut self, key: K, value: V) {
if !self.values.contains_key(&key) {
self.index.push(key.clone());
let OrderedMap { ref mut index, ref mut values } = *self;
match values.entry(key) {
Entry::Vacant(mut entry) => {
index.push(entry.key().clone());
entry.insert(value);
}
Entry::Occupied(mut entry) => {
entry.insert(value);
}
}
self.values.insert(key, value);
}
/// Get a value given its key.
@ -666,8 +677,6 @@ fn substitute_all(custom_properties_map: &mut CustomPropertiesMap) {
/// been completely resolved.
/// * There is no such variable at all.
fn traverse<'a>(name: Name, context: &mut Context<'a>) -> Option<usize> {
use hash::map::Entry;
// Some shortcut checks.
let (name, value) = if let Some(value) = context.map.get(&name) {
// This variable has been resolved. Return the signal value.