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style: Speed up selector matching with already-lowercase local name selectors

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This makes relatively simple changes so that we check lowercase-ness of
local-name selectors first. If so, we don't need to check whether we're
an HTML element in an HTML document, which requires a fair bit of
pointer-chasing.

Differential Revision: https://phabricator.services.mozilla.com/D163627
This commit is contained in:
Emilio Cobos Álvarez 2022-12-03 11:25:09 +00:00 • committed by Martin Robinson
parent dbba87d73e
commit b6d9b77a15
3 changed files with 47 additions and 46 deletions
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27
components/selectors/attr.rs
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@ -145,35 +145,16 @@ pub static SELECTOR_WHITESPACE: &[char] = &[' ', '\t', '\n', '\r', '\x0C'];
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
#[cfg_attr(feature = "shmem", derive(ToShmem))]
pub enum ParsedCaseSensitivity {
// 's' was specified.
/// 's' was specified.
ExplicitCaseSensitive,
// 'i' was specified.
/// 'i' was specified.
AsciiCaseInsensitive,
// No flags were specified and HTML says this is a case-sensitive attribute.
/// No flags were specified and HTML says this is a case-sensitive attribute.
CaseSensitive,
// No flags were specified and HTML says this is a case-insensitive attribute.
/// No flags were specified and HTML says this is a case-insensitive attribute.
AsciiCaseInsensitiveIfInHtmlElementInHtmlDocument,
}
impl ParsedCaseSensitivity {
pub fn to_unconditional(self, is_html_element_in_html_document: bool) -> CaseSensitivity {
match self {
ParsedCaseSensitivity::AsciiCaseInsensitiveIfInHtmlElementInHtmlDocument
if is_html_element_in_html_document =>
{
CaseSensitivity::AsciiCaseInsensitive
},
ParsedCaseSensitivity::AsciiCaseInsensitiveIfInHtmlElementInHtmlDocument => {
CaseSensitivity::CaseSensitive
},
ParsedCaseSensitivity::CaseSensitive | ParsedCaseSensitivity::ExplicitCaseSensitive => {
CaseSensitivity::CaseSensitive
},
ParsedCaseSensitivity::AsciiCaseInsensitive => CaseSensitivity::AsciiCaseInsensitive,
}
}
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum CaseSensitivity {
CaseSensitive,