This is a work in progress project to experiment with Chain and E.num in useful ways.
public enum Variable: Hashable {
case void
case bool(Bool)
case int(Int)
case float(Float)
case double(Double)
case string(String)
case set(Set<Variable>)
case array([Variable])
case dictionary([Variable: Variable])
}
public enum Function {
case void(() -> ())
case `in`((Variable) -> ())
case out(() -> Variable)
case `inout`((Variable) -> Variable)
}
public indirect enum Chain {
case end
case complete(E.Function?)
case link(E.Function, Chain)
case background(E.Function, Chain)
case multi([Chain])
}
let observedValue: ObservedValue<Int> = ObservedValue()
observedValue.didChangeHandler = .complete(
.void {
sleep(1)
print("Done!")
XCTAssertNotNil(observedValue.value)
}
)
observedValue.update(value: 5)
observedValue.update(value: 15)
observedValue.update(value: 25)
@Observed var index = 4
_index.didChangeHandler = .link(
.void {
viewModel.update(value: values[index])
},
.complete(
.void {
updateUI()
}
)
)
guard values.count < index && index >= 0 else {
return
}
index += 1
link |
Stars: 3 |
Last commit: 3 years ago |
Modifiable callChain
public class ObservedValue<T> {
private(set) public var value: T?
public var callChain: Chain = .end
public var didChangeHandler: Chain?
public init(value: T? = nil) {
self.value = value
self.callChain = .complete(
.out { [weak self] in
self?.didChangeHandler?.run(name: "ObservedValue<\(T.self)>.didChangeHandler") ?? .void
}
)
}
@discardableResult
public func update(value: T) -> Variable {
self.value = value
return callChain.run(name: "ObservedValue<\(T.self)>.callChain")
}
}
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