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style: Simplify media query code now that lifetimes are non-lexical.

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We can deindent and simplify a bunch of this code now.

Differential Revision: https://phabricator.services.mozilla.com/D49509
This commit is contained in:
Emilio Cobos Álvarez 2019-10-20 13:44:07 +00:00
parent 11c1317c37
commit ca05003ef6
1 changed files with 44 additions and 71 deletions
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115
components/style/media_queries/media_feature_expression.rs
View file

@ -244,7 +244,7 @@ fn consume_operation_or_colon(input: &mut Parser) -> Result<Option<Operator>, ()
fn disabled_by_pref(feature: &Atom) -> bool {
if *feature == atom!("-moz-touch-enabled") {
return !static_prefs::pref!("layout.css.moz-touch-enabled.enabled")
return !static_prefs::pref!("layout.css.moz-touch-enabled.enabled");
}
false
}
@ -286,80 +286,53 @@ impl MediaFeatureExpression {
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
// FIXME: remove extra indented block when lifetimes are non-lexical
let feature_index;
let feature;
let range;
let mut requirements = ParsingRequirements::empty();
let location = input.current_source_location();
let ident = input.expect_ident()?;
if context.in_ua_or_chrome_sheet() {
requirements.insert(ParsingRequirements::CHROME_AND_UA_ONLY);
}
let mut feature_name = &**ident;
if starts_with_ignore_ascii_case(feature_name, "-webkit-") {
feature_name = &feature_name[8..];
requirements.insert(ParsingRequirements::WEBKIT_PREFIX);
}
let range = if starts_with_ignore_ascii_case(feature_name, "min-") {
feature_name = &feature_name[4..];
Some(Range::Min)
} else if starts_with_ignore_ascii_case(feature_name, "max-") {
feature_name = &feature_name[4..];
Some(Range::Max)
} else {
None
};
let atom = Atom::from(string_as_ascii_lowercase(feature_name));
let (feature_index, feature) = match MEDIA_FEATURES
.iter()
.enumerate()
.find(|(_, f)| f.name == atom)
{
let location = input.current_source_location();
let ident = input.expect_ident()?;
let mut requirements = ParsingRequirements::empty();
if context.in_ua_or_chrome_sheet() {
requirements.insert(ParsingRequirements::CHROME_AND_UA_ONLY);
}
let result = {
let mut feature_name = &**ident;
if starts_with_ignore_ascii_case(feature_name, "-webkit-") {
feature_name = &feature_name[8..];
requirements.insert(ParsingRequirements::WEBKIT_PREFIX);
}
let range = if starts_with_ignore_ascii_case(feature_name, "min-") {
feature_name = &feature_name[4..];
Some(Range::Min)
} else if starts_with_ignore_ascii_case(feature_name, "max-") {
feature_name = &feature_name[4..];
Some(Range::Max)
} else {
None
};
let atom = Atom::from(string_as_ascii_lowercase(feature_name));
if disabled_by_pref(&atom) {
return Err(location.new_custom_error(
StyleParseErrorKind::MediaQueryExpectedFeatureName(ident.clone()),
));
}
match MEDIA_FEATURES
.iter()
.enumerate()
.find(|(_, f)| f.name == atom)
{
Some((i, f)) => Ok((i, f, range)),
None => Err(()),
}
};
match result {
Ok((i, f, r)) => {
feature_index = i;
feature = f;
range = r;
},
Err(()) => {
return Err(location.new_custom_error(
StyleParseErrorKind::MediaQueryExpectedFeatureName(ident.clone()),
));
},
}
if !(feature.requirements & !requirements).is_empty() {
Some((i, f)) => (i, f),
None => {
return Err(location.new_custom_error(
StyleParseErrorKind::MediaQueryExpectedFeatureName(ident.clone()),
));
}
))
},
};
if range.is_some() && !feature.allows_ranges() {
return Err(location.new_custom_error(
StyleParseErrorKind::MediaQueryExpectedFeatureName(ident.clone()),
));
}
if disabled_by_pref(&feature.name) ||
!requirements.contains(feature.requirements) ||
(range.is_some() && !feature.allows_ranges())
{
return Err(location.new_custom_error(
StyleParseErrorKind::MediaQueryExpectedFeatureName(ident.clone()),
));
}
let operator = input.try(consume_operation_or_colon);