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style: Simplify the cascade function in the custom_properties module.

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Emilio Cobos Álvarez 2017-01-02 01:00:29 +01:00
parent c44826f1cc
commit 369c2f299e
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GPG key ID: 056B727BB9C1027C
1 changed files with 36 additions and 34 deletions
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70
components/style/custom_properties.rs
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@ -329,41 +329,43 @@ pub fn cascade<'a>(custom_properties: &mut Option<HashMap<&'a Name, BorrowedSpec
seen: &mut HashSet<&'a Name>,
name: &'a Name,
specified_value: &'a DeclaredValue<SpecifiedValue>) {
let was_not_already_present = seen.insert(name);
if was_not_already_present {
let map = match *custom_properties {
Some(ref mut map) => map,
None => {
*custom_properties = Some(match *inherited {
Some(ref inherited) => inherited.iter().map(|(key, inherited_value)| {
(key, BorrowedSpecifiedValue {
css: &inherited_value.css,
first_token_type: inherited_value.first_token_type,
last_token_type: inherited_value.last_token_type,
references: None
})
}).collect(),
None => HashMap::new(),
});
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::Initial => {
map.remove(&name);
}
DeclaredValue::Unset | // Custom properties are inherited by default.
DeclaredValue::Inherit => {} // The inherited value is what we already have.
let was_already_present = !seen.insert(name);
if was_already_present {
return;
}
let map = match *custom_properties {
Some(ref mut map) => map,
None => {
*custom_properties = Some(match *inherited {
Some(ref inherited) => inherited.iter().map(|(key, inherited_value)| {
(key, BorrowedSpecifiedValue {
css: &inherited_value.css,
first_token_type: inherited_value.first_token_type,
last_token_type: inherited_value.last_token_type,
references: None
})
}).collect(),
None => HashMap::new(),
});
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::Initial => {
map.remove(&name);
}
DeclaredValue::Unset | // Custom properties are inherited by default.
DeclaredValue::Inherit => {} // The inherited value is what we already have.
}
}