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style: Allow CSS wide-keywords in custom property fallback.

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Differential Revision: https://phabricator.services.mozilla.com/D28349
This commit is contained in:
Emilio Cobos Álvarez 2019-04-23 13:13:11 +00:00
parent e5b5cd78a9
commit 07c0c1e53f
1 changed files with 77 additions and 59 deletions
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58
components/style/properties/properties.mako.rs
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@ -1085,6 +1085,8 @@ impl LonghandId {
}
}
// TODO(emilio): Should we use a function table like CASCADE_PROPERTY does
// to avoid blowing up code-size here?
fn parse_value<'i, 't>(
&self,
context: &ParserContext,
@ -1532,12 +1534,28 @@ impl UnparsedValue {
quirks_mode: QuirksMode,
environment: &::custom_properties::CssEnvironment,
) -> PropertyDeclaration {
crate::custom_properties::substitute(
let invalid_at_computed_value_time = || {
let keyword = if longhand_id.inherited() {
CSSWideKeyword::Inherit
} else {
CSSWideKeyword::Initial
};
PropertyDeclaration::CSSWideKeyword(WideKeywordDeclaration {
id: longhand_id,
keyword,
})
};
let css = match crate::custom_properties::substitute(
&self.css,
self.first_token_type,
custom_properties,
environment,
).ok().and_then(|css| {
) {
Ok(css) => css,
Err(..) => return invalid_at_computed_value_time(),
};
// As of this writing, only the base URL is used for property
// values.
//
@ -1559,12 +1577,21 @@ impl UnparsedValue {
);
let mut input = ParserInput::new(&css);
Parser::new(&mut input).parse_entirely(|input| {
let mut input = Parser::new(&mut input);
input.skip_whitespace(); // Unnecessary for correctness, but may help try() rewind less.
if let Ok(keyword) = input.try(CSSWideKeyword::parse) {
return PropertyDeclaration::CSSWideKeyword(WideKeywordDeclaration {
id: longhand_id,
keyword,
});
}
let declaration = input.parse_entirely(|input| {
match self.from_shorthand {
None => longhand_id.parse_value(&context, input),
Some(ShorthandId::All) => {
// No need to parse the 'all' shorthand as anything other than a CSS-wide
// keyword, after variable substitution.
// No need to parse the 'all' shorthand as anything other
// than a CSS-wide keyword, after variable substitution.
Err(input.new_custom_error(SelectorParseErrorKind::UnexpectedIdent("all".into())))
}
% for shorthand in data.shorthands_except_all():
@ -1585,21 +1612,12 @@ impl UnparsedValue {
}
% endfor
}
})
.ok()
})
.unwrap_or_else(|| {
// Invalid at computed-value time.
let keyword = if longhand_id.inherited() {
CSSWideKeyword::Inherit
} else {
CSSWideKeyword::Initial
};
PropertyDeclaration::CSSWideKeyword(WideKeywordDeclaration {
id: longhand_id,
keyword,
})
})
});
match declaration {
Ok(decl) => decl,
Err(..) => invalid_at_computed_value_time(),
}
}
}