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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Parse/serialize and resolve a single color component.
/// A single color component.
#[derive(Clone, MallocSizeOf, PartialEq, ToShmem)]
pub enum ColorComponent<ValueType> {
/// The "none" keyword.
None,
/// A absolute value.
Value(ValueType),
}
impl<ValueType> ColorComponent<ValueType> {
/// Return true if the component is "none".
#[inline]
pub fn is_none(&self) -> bool {
matches!(self, Self::None)
}
/// If the component contains a value, map it to another value.
pub fn map_value<OutType>(
self,
f: impl FnOnce(ValueType) -> OutType,
) -> ColorComponent<OutType> {
match self {
Self::None => ColorComponent::None,
Self::Value(value) => ColorComponent::Value(f(value)),
}
}
/// Return the component as its value.
pub fn into_value(self) -> ValueType {
match self {
Self::None => panic!("value not available when component is None"),
Self::Value(value) => value,
}
}
/// Return the component as its value or a default value.
pub fn into_value_or(self, default: ValueType) -> ValueType {
match self {
Self::None => default,
Self::Value(value) => value,
}
}
}
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