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style: Implement CSS @supports font-format(...) and font-tech(...) functions

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These are gated by the same layout.css.font-tech.enabled pref as the
closely-related `tech()` function for the @font-face src descriptor;
once the spec questions are settled, we should enable them all together.

Differential Revision: https://phabricator.services.mozilla.com/D155359
This commit is contained in:
Jonathan Kew 2022-08-25 12:19:21 +00:00 • committed by Martin Robinson
parent 6f2861e466
commit 2fb319ede2
2 changed files with 55 additions and 16 deletions
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36
components/style/font_face.rs
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@ -102,6 +102,25 @@ bitflags! {
}
}
impl FontFaceSourceTechFlags {
/// Parse a single font-technology keyword and return its flag.
pub fn parse_one<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
Ok(try_match_ident_ignore_ascii_case! { input,
"feature-opentype" => Self::FEATURE_OPENTYPE,
"feature-aat" => Self::FEATURE_AAT,
"feature-graphite" => Self::FEATURE_GRAPHITE,
"color-colrv0" => Self::COLOR_COLRV0,
"color-colrv1" => Self::COLOR_COLRV1,
"color-svg" => Self::COLOR_SVG,
"color-sbix" => Self::COLOR_SBIX,
"color-cbdt" => Self::COLOR_CBDT,
"variations" => Self::VARIATIONS,
"palettes" => Self::PALETTES,
"incremental" => Self::INCREMENTAL,
})
}
}
impl Parse for FontFaceSourceTechFlags {
fn parse<'i, 't>(
_context: &ParserContext,
@ -112,22 +131,7 @@ impl Parse for FontFaceSourceTechFlags {
// because we insert the flags into result as we go.
let mut result = Self::empty();
input.parse_comma_separated(|input| {
let location = input.current_source_location();
let ident = input.expect_ident()?;
let flag = match_ignore_ascii_case! { ident,
"feature-opentype" => Self::FEATURE_OPENTYPE,
"feature-aat" => Self::FEATURE_AAT,
"feature-graphite" => Self::FEATURE_GRAPHITE,
"color-colrv0" => Self::COLOR_COLRV0,
"color-colrv1" => Self::COLOR_COLRV1,
"color-svg" => Self::COLOR_SVG,
"color-sbix" => Self::COLOR_SBIX,
"color-cbdt" => Self::COLOR_CBDT,
"variations" => Self::VARIATIONS,
"palettes" => Self::PALETTES,
"incremental" => Self::INCREMENTAL,
_ => return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError)),
};
let flag = Self::parse_one(input)?;
result.insert(flag);
Ok(())
})?;