import Foundation

// a struct that replaces the RAC macro
struct RAC  {
  var target : NSObject!
  var keyPath : String!
  var nilValue : AnyObject!

  init(_ target: NSObject!, _ keyPath: String, nilValue: AnyObject? = nil) {
    self.target = target
    self.keyPath = keyPath
    self.nilValue = nilValue
  }

  func assignSignal(signal : RACSignal) {
    signal.setKeyPath(self.keyPath, onObject: self.target, nilValue: self.nilValue)
  }
}

infix operator ~> {}
func ~> (signal: RACSignal, rac: RAC) {
  rac.assignSignal(signal)
}

infix operator <~ {}
func <~ (rac: RAC, signal: RACSignal) {
  rac.assignSignal(signal)
}

func RACObserve(target: NSObject!, keyPath: String) -> RACSignal  {
  return target.rac_valuesForKeyPath(keyPath, observer: target)
}