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style: Hoist cascade() to CustomPropertyBuilder.

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Emilio Cobos Álvarez 2017-10-08 19:12:47 +02:00
parent 715fc9cea6
commit 4914351f2b
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1 changed files with 42 additions and 59 deletions
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101
components/style/custom_properties.rs
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@ -481,13 +481,48 @@ impl<'a> CustomPropertiesBuilder<'a> {
name: &'a Name,
specified_value: DeclaredValue<'a, Box<SpecifiedValue>>,
) {
cascade(
&mut self.custom_properties,
self.inherited,
&mut self.seen,
name,
specified_value,
)
let was_already_present = !self.seen.insert(name);
if was_already_present {
return;
}
let map = match self.custom_properties {
Some(ref mut map) => map,
None => {
let mut map = OrderedMap::new();
if let Some(inherited) = self.inherited {
for (name, inherited_value) in inherited.iter() {
map.insert(name, BorrowedSpecifiedValue {
css: &inherited_value.css,
first_token_type: inherited_value.first_token_type,
last_token_type: inherited_value.last_token_type,
references: None
})
}
}
self.custom_properties = Some(map);
self.custom_properties.as_mut().unwrap()
}
};
match specified_value {
DeclaredValue::Value(ref specified_value) => {
map.insert(name, BorrowedSpecifiedValue {
css: &specified_value.css,
first_token_type: specified_value.first_token_type,
last_token_type: specified_value.last_token_type,
references: Some(&specified_value.references),
});
},
DeclaredValue::WithVariables(_) => unreachable!(),
DeclaredValue::CSSWideKeyword(keyword) => match keyword {
CSSWideKeyword::Initial => {
map.remove(&name);
}
CSSWideKeyword::Unset | // Custom properties are inherited by default.
CSSWideKeyword::Inherit => {} // The inherited value is what we already have.
}
}
}
/// Returns the final map of applicable custom properties.
@ -507,58 +542,6 @@ impl<'a> CustomPropertiesBuilder<'a> {
}
}
/// Add one custom property declaration to a map, unless another with the same
/// name was already there.
fn cascade<'a>(
custom_properties: &mut Option<OrderedMap<&'a Name, BorrowedSpecifiedValue<'a>>>,
inherited: Option<&'a Arc<CustomPropertiesMap>>,
seen: &mut PrecomputedHashSet<&'a Name>,
name: &'a Name,
specified_value: DeclaredValue<'a, Box<SpecifiedValue>>
) {
let was_already_present = !seen.insert(name);
if was_already_present {
return;
}
let map = match *custom_properties {
Some(ref mut map) => map,
None => {
let mut map = OrderedMap::new();
if let Some(inherited) = inherited {
for (name, inherited_value) in inherited.iter() {
map.insert(name, BorrowedSpecifiedValue {
css: &inherited_value.css,
first_token_type: inherited_value.first_token_type,
last_token_type: inherited_value.last_token_type,
references: None
})
}
}
*custom_properties = Some(map);
custom_properties.as_mut().unwrap()
}
};
match specified_value {
DeclaredValue::Value(ref specified_value) => {
map.insert(name, BorrowedSpecifiedValue {
css: &specified_value.css,
first_token_type: specified_value.first_token_type,
last_token_type: specified_value.last_token_type,
references: Some(&specified_value.references),
});
},
DeclaredValue::WithVariables(_) => unreachable!(),
DeclaredValue::CSSWideKeyword(keyword) => match keyword {
CSSWideKeyword::Initial => {
map.remove(&name);
}
CSSWideKeyword::Unset | // Custom properties are inherited by default.
CSSWideKeyword::Inherit => {} // The inherited value is what we already have.
}
}
}
/// https://drafts.csswg.org/css-variables/#cycles
///
/// The initial value of a custom property is represented by this property not