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style: Add a SelectorMapEntry trait.

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Emilio Cobos Álvarez 2017-05-22 00:52:00 +02:00
parent a67e880256
commit e51ca0958e
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3 changed files with 24 additions and 14 deletions
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24
components/style/selector_map.rs
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@ -20,6 +20,18 @@ use std::collections::HashMap;
use std::hash::Hash;
use stylist::{ApplicableDeclarationBlock, Rule};
/// A trait to abstract over a given selector map entry.
pub trait SelectorMapEntry : Sized + Clone {
/// Get the selector we should use to index in the selector map.
fn selector(&self) -> &SelectorInner<SelectorImpl>;
}
impl SelectorMapEntry for SelectorInner<SelectorImpl> {
fn selector(&self) -> &SelectorInner<SelectorImpl> {
self
}
}
/// Map element data to selector-providing objects for which the last simple
/// selector starts with them.
///
@ -44,7 +56,7 @@ use stylist::{ApplicableDeclarationBlock, Rule};
/// TODO: Tune the initial capacity of the HashMap
#[derive(Debug)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
pub struct SelectorMap<T: Clone + Borrow<SelectorInner<SelectorImpl>>> {
pub struct SelectorMap<T: SelectorMapEntry> {
/// A hash from an ID to rules which contain that ID selector.
pub id_hash: FnvHashMap<Atom, Vec<T>>,
/// A hash from a class name to rules which contain that class selector.
@ -62,7 +74,7 @@ fn sort_by_key<T, F: Fn(&T) -> K, K: Ord>(v: &mut [T], f: F) {
sort_by(v, |a, b| f(a).cmp(&f(b)))
}
impl<T> SelectorMap<T> where T: Clone + Borrow<SelectorInner<SelectorImpl>> {
impl<T: SelectorMapEntry> SelectorMap<T> {
/// Trivially constructs an empty `SelectorMap`.
pub fn new() -> Self {
SelectorMap {
@ -217,22 +229,22 @@ impl SelectorMap<Rule> {
}
}
impl<T> SelectorMap<T> where T: Clone + Borrow<SelectorInner<SelectorImpl>> {
impl<T: SelectorMapEntry> SelectorMap<T> {
/// Inserts into the correct hash, trying id, class, and localname.
pub fn insert(&mut self, entry: T) {
self.count += 1;
if let Some(id_name) = get_id_name(entry.borrow()) {
if let Some(id_name) = get_id_name(entry.selector()) {
find_push(&mut self.id_hash, id_name, entry);
return;
}
if let Some(class_name) = get_class_name(entry.borrow()) {
if let Some(class_name) = get_class_name(entry.selector()) {
find_push(&mut self.class_hash, class_name, entry);
return;
}
if let Some(LocalNameSelector { name, lower_name }) = get_local_name(entry.borrow()) {
if let Some(LocalNameSelector { name, lower_name }) = get_local_name(entry.selector()) {
// If the local name in the selector isn't lowercase, insert it into
// the rule hash twice. This means that, during lookup, we can always
// find the rules based on the local name of the element, regardless