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style: Shrink selectors::Component to 24 bytes.

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This saves about 37 KiB of memory across the UA style sheets.

Bug: 1475197
Reviewed-by: emilio
This commit is contained in:
Cameron McCormack 2018-07-16 12:15:47 +10:00 • committed by Emilio Cobos Álvarez
parent b05ace3e4a
commit 62419adaaa
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GPG key ID: 056B727BB9C1027C
12 changed files with 96 additions and 50 deletions
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12
components/style/gecko/selector_parser.rs
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@ -13,11 +13,13 @@ use gecko_bindings::sugar::ownership::{HasBoxFFI, HasFFI, HasSimpleFFI};
use invalidation::element::document_state::InvalidationMatchingData;
use selector_parser::{Direction, SelectorParser};
use selectors::SelectorList;
use selectors::parser::{self as selector_parser, Selector, SelectorParseErrorKind, Visit};
use selectors::parser::{self as selector_parser, Selector};
use selectors::parser::{SelectorParseErrorKind, Visit};
use selectors::visitor::SelectorVisitor;
use std::fmt;
use string_cache::{Atom, Namespace, WeakAtom, WeakNamespace};
use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss as ToCss_};
use thin_slice::ThinBoxedSlice;
pub use gecko::pseudo_element::{PseudoElement, EAGER_PSEUDOS, EAGER_PSEUDO_COUNT, PSEUDO_COUNT};
pub use gecko::snapshot::SnapshotMap;
@ -34,7 +36,7 @@ bitflags! {
}
/// The type used for storing pseudo-class string arguments.
pub type PseudoClassStringArg = Box<[u16]>;
pub type PseudoClassStringArg = ThinBoxedSlice<u16>;
macro_rules! pseudo_class_name {
(bare: [$(($css:expr, $name:ident, $gecko_type:tt, $state:tt, $flags:tt),)*],
@ -56,7 +58,7 @@ macro_rules! pseudo_class_name {
///
/// TODO(emilio): We disallow combinators and pseudos here, so we
/// should use SimpleSelector instead
MozAny(Box<[Selector<SelectorImpl>]>),
MozAny(ThinBoxedSlice<Selector<SelectorImpl>>),
/// The non-standard `:-moz-locale-dir` pseudo-class.
MozLocaleDir(Box<Direction>),
}
@ -405,7 +407,7 @@ impl<'a, 'i> ::selectors::Parser<'i> for SelectorParser<'a> {
// convert to null terminated utf16 string
// since that's what Gecko deals with
let utf16: Vec<u16> = name.encode_utf16().chain(Some(0u16)).collect();
NonTSPseudoClass::$s_name(utf16.into_boxed_slice())
NonTSPseudoClass::$s_name(utf16.into_boxed_slice().into())
}, )*
"-moz-locale-dir" => {
NonTSPseudoClass::MozLocaleDir(
@ -422,7 +424,7 @@ impl<'a, 'i> ::selectors::Parser<'i> for SelectorParser<'a> {
selector_parser::parse_compound_selector_list(
self,
parser,
)?
)?.into()
)
}
_ => return Err(parser.new_custom_error(