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Stop creating unnecessarily-large SmallVecs for specific tasks.

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MozReview-Commit-ID: IM9aAjSeJI9
This commit is contained in:
Bobby Holley 2017-06-17 20:20:19 -07:00
parent db8f59407f
commit fac5aeb092
1 changed files with 17 additions and 14 deletions
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31
components/selectors/parser.rs
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@ -9,6 +9,7 @@ use cssparser::{ParseError, BasicParseError, CompactCowStr};
use cssparser::{Token, Parser as CssParser, parse_nth, ToCss, serialize_identifier, CssStringWriter};
use precomputed_hash::PrecomputedHash;
use servo_arc::{Arc, HeaderWithLength, ThinArc};
use sink::Push;
use smallvec::SmallVec;
use std::ascii::AsciiExt;
use std::borrow::{Borrow, Cow};
@ -1120,10 +1121,11 @@ impl<Impl: SelectorImpl> Selector<Impl> {
/// * `Err(())`: Invalid selector, abort
/// * `Ok(false)`: Not a type selector, could be something else. `input` was not consumed.
/// * `Ok(true)`: Length 0 (`*|*`), 1 (`*|E` or `ns|*`) or 2 (`|E` or `ns|E`)
fn parse_type_selector<'i, 't, P, E, Impl>(parser: &P, input: &mut CssParser<'i, 't>,
sequence: &mut ParseVec<Impl>)
-> Result<bool, ParseError<'i, SelectorParseError<'i, E>>>
where P: Parser<'i, Impl=Impl, Error=E>, Impl: SelectorImpl
fn parse_type_selector<'i, 't, P, E, Impl, S>(parser: &P, input: &mut CssParser<'i, 't>, sink: &mut S)
-> Result<bool, ParseError<'i, SelectorParseError<'i, E>>>
where P: Parser<'i, Impl=Impl, Error=E>,
Impl: SelectorImpl,
S: Push<Component<Impl>>,
{
match parse_qualified_name(parser, input, /* in_attr_selector = */ false)? {
None => Ok(false),
@ -1131,16 +1133,16 @@ fn parse_type_selector<'i, 't, P, E, Impl>(parser: &P, input: &mut CssParser<'i,
match namespace {
QNamePrefix::ImplicitAnyNamespace => {}
QNamePrefix::ImplicitDefaultNamespace(url) => {
sequence.push(Component::DefaultNamespace(url))
sink.push(Component::DefaultNamespace(url))
}
QNamePrefix::ExplicitNamespace(prefix, url) => {
sequence.push(Component::Namespace(prefix, url))
sink.push(Component::Namespace(prefix, url))
}
QNamePrefix::ExplicitNoNamespace => {
sequence.push(Component::ExplicitNoNamespace)
sink.push(Component::ExplicitNoNamespace)
}
QNamePrefix::ExplicitAnyNamespace => {
sequence.push(Component::ExplicitAnyNamespace)
sink.push(Component::ExplicitAnyNamespace)
}
QNamePrefix::ImplicitNoNamespace => {
unreachable!() // Not returned with in_attr_selector = false
@ -1148,13 +1150,13 @@ fn parse_type_selector<'i, 't, P, E, Impl>(parser: &P, input: &mut CssParser<'i,
}
match local_name {
Some(name) => {
sequence.push(Component::LocalName(LocalName {
sink.push(Component::LocalName(LocalName {
lower_name: from_cow_str(to_ascii_lowercase(&name)),
name: from_cow_str(name.into()),
}))
}
None => {
sequence.push(Component::ExplicitUniversalType)
sink.push(Component::ExplicitUniversalType)
}
}
Ok(true)
@ -1422,7 +1424,7 @@ fn parse_negation<'i, 't, P, E, Impl>(parser: &P,
where P: Parser<'i, Impl=Impl, Error=E>, Impl: SelectorImpl
{
// We use a sequence because a type selector may be represented as two Components.
let mut sequence = ParseVec::new();
let mut sequence = SmallVec::<[Component<Impl>; 2]>::new();
// Consume any leading whitespace.
loop {
@ -1476,7 +1478,7 @@ fn parse_compound_selector<'i, 't, P, E, Impl>(
}
}
let mut empty = true;
if !parse_type_selector(parser, input, &mut sequence)? {
if !parse_type_selector(parser, input, sequence)? {
if let Some(url) = parser.default_namespace() {
// If there was no explicit type selector, but there is a
// default namespace, there is an implicit "<defaultns>|*" type
@ -1496,8 +1498,9 @@ fn parse_compound_selector<'i, 't, P, E, Impl>(
empty = false
}
Some(SimpleSelectorParseResult::PseudoElement(p)) => {
// Try to parse state to its right.
let mut state_selectors = ParseVec::new();
// Try to parse state to its right. There are only 3 allowable
// state selectors that can go on pseudo-elements.
let mut state_selectors = SmallVec::<[Component<Impl>; 3]>::new();
loop {
match input.next_including_whitespace() {