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style: Implement Kleene logic for query feature expressions

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Differential Revision: https://phabricator.services.mozilla.com/D163879
This commit is contained in:
Oriol Brufau 2022-12-06 12:06:37 +00:00 • committed by Martin Robinson
parent 134f680503
commit 6c02e9fdaa
2 changed files with 7 additions and 6 deletions
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11
components/style/queries/feature_expression.rs
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@ -8,6 +8,7 @@
use super::feature::{Evaluator, QueryFeatureDescription};
use super::feature::{FeatureFlags, KeywordDiscriminant};
use crate::parser::{Parse, ParserContext};
use crate::queries::condition::KleeneValue;
use crate::str::{starts_with_ignore_ascii_case, string_as_ascii_lowercase};
use crate::values::computed::{self, Ratio, ToComputedValue};
use crate::values::specified::{Integer, Length, Number, Resolution};
@ -575,7 +576,7 @@ impl QueryFeatureExpression {
}
/// Returns whether this query evaluates to true for the given device.
pub fn matches(&self, context: &computed::Context) -> bool {
pub fn matches(&self, context: &computed::Context) -> KleeneValue {
macro_rules! expect {
($variant:ident, $v:expr) => {
match *$v {
@ -585,7 +586,7 @@ impl QueryFeatureExpression {
};
}
match self.feature().evaluator {
KleeneValue::from(match self.feature().evaluator {
Evaluator::Length(eval) => {
let v = eval(context);
self.kind
@ -594,7 +595,7 @@ impl QueryFeatureExpression {
Evaluator::OptionalLength(eval) => {
let v = match eval(context) {
Some(v) => v,
None => return false,
None => return KleeneValue::Unknown,
};
self.kind
.evaluate(v, |v| expect!(Length, v).to_computed_value(context))
@ -619,7 +620,7 @@ impl QueryFeatureExpression {
Evaluator::OptionalNumberRatio(eval) => {
let ratio = match eval(context) {
Some(v) => v,
None => return false,
None => return KleeneValue::Unknown,
};
// See above for subtleties here.
self.kind
@ -646,7 +647,7 @@ impl QueryFeatureExpression {
let boolean = eval(context);
computed.map_or(boolean, |v| v == boolean)
},
}
})
}
}