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Make entity value getter and setter optional compatible

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Christian Treffs 2020-10-20 14:38:18 +02:00
parent 27bad0e740
commit a8c0d94e44
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GPG Key ID: 49A4B4B460BE3ED4
1 changed files with 51 additions and 0 deletions
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51
Sources/FirebladeECS/Entity+Component.swift
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@ -56,18 +56,35 @@ extension Entity {
}
/// Get the value of a component using the key Path to the property in the component.
///
/// A `Comp` instance must be assigned to this entity!
/// - Parameter componentKeyPath: The `KeyPath` to the property of the given component.
@inlinable
public func get<Comp, Value>(valueAt componentKeyPath: KeyPath<Comp, Value>) -> Value where Comp: Component {
self.get(component: Comp.self)![keyPath: componentKeyPath]
}
/// Get the value of a component using the key Path to the property in the component.
///
/// A `Comp` instance must be assigned to this entity!
/// - Parameter componentKeyPath: The `KeyPath` to the property of the given component.
@inlinable
public func get<Comp, Value>(valueAt componentKeyPath: KeyPath<Comp, Value?>) -> Value? where Comp: Component {
self.get(component: Comp.self)![keyPath: componentKeyPath]
}
/// Get the value of a component using the key Path to the property in the component.
@inlinable
public subscript<Comp, Value>(_ componentKeyPath: KeyPath<Comp, Value>) -> Value where Comp: Component {
self.get(valueAt: componentKeyPath)
}
/// Get the value of a component using the key Path to the property in the component.
@inlinable
public subscript<Comp, Value>(_ componentKeyPath: KeyPath<Comp, Value?>) -> Value? where Comp: Component {
self.get(valueAt: componentKeyPath)
}
/// Set the value of a component using the key path to the property in the component.
///
/// **Behavior:**
@ -91,6 +108,29 @@ extension Entity {
return true
}
/// Set the value of a component using the key path to the property in the component.
///
/// **Behavior:**
/// - If `Comp` is a component type that is currently *not* assigned to this entity,
/// a new instance of `Comp` will be default initialized and `newValue` will be set at the given keyPath.
///
/// - Parameters:
/// - newValue: The value to set.
/// - componentKeyPath: The `ReferenceWritableKeyPath` to the property of the given component.
/// - Returns: Returns true if an action was performed, false otherwise.
@inlinable
@discardableResult
public func set<Comp, Value>(value newValue: Value?, for componentKeyPath: ReferenceWritableKeyPath<Comp, Value?>) -> Bool where Comp: Component & DefaultInitializable {
guard has(Comp.self) else {
let newInstance = Comp()
newInstance[keyPath: componentKeyPath] = newValue
return nexus.assign(component: newInstance, entityId: identifier)
}
get(component: Comp.self)![keyPath: componentKeyPath] = newValue
return true
}
/// Set the value of a component using the key path to the property in the component.
///
/// **Behavior:**
@ -101,4 +141,15 @@ extension Entity {
get { self.get(valueAt: componentKeyPath) }
nonmutating set { self.set(value: newValue, for: componentKeyPath) }
}
/// Set the value of a component using the key path to the property in the component.
///
/// **Behavior:**
/// - If `Comp` is a component type that is currently *not* assigned to this entity,
/// a new instance of `Comp` will be default initialized and `newValue` will be set at the given keyPath.
@inlinable
public subscript<Comp, Value>(_ componentKeyPath: ReferenceWritableKeyPath<Comp, Value?>) -> Value? where Comp: Component & DefaultInitializable {
get { self.get(valueAt: componentKeyPath) }
nonmutating set { self.set(value: newValue, for: componentKeyPath) }
}
}