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package cc.spray.json
package object lenses {
type JsPred = JsValue => Boolean
type Id[T] = T
type Validated[T] = Either[Exception, T]
type SafeJsValue = Validated[JsValue]
type Operation = SafeJsValue => SafeJsValue
type ScalarProjection = Projection[Id]
type OptProjection = Projection[Option]
type SeqProjection = Projection[Seq]
def ??? = sys.error("NYI")
def unexpected(message: String) = Left(new RuntimeException(message))
def outOfBounds(message: String) = Left(new IndexOutOfBoundsException(message))
implicit def rightBiasEither[A, B](e: Either[A, B]): Either.RightProjection[A, B] = e.right
case class GetOrThrow[B](e: Either[Throwable, B]) {
def getOrThrow: B = e match {
case Right(b) => b
case Left(e) => throw e
}
}
implicit def orThrow[B](e: Either[Throwable, B]): GetOrThrow[B] = GetOrThrow(e)
trait Reader[T] {
def read(js: JsValue): Validated[T]
}
object Reader {
implicit def safeMonadicReader[T: JsonReader]: Reader[T] = new Reader[T] {
def read(js: JsValue): Validated[T] =
safe(js.convertTo[T])
}
}
def safe[T](body: => T): Validated[T] =
try {
Right(body)
} catch {
case e: Exception => Left(e)
}
case class ValidateOption[T](option: Option[T]) {
def getOrError(message: => String): Validated[T] = option match {
case Some(t) => Right(t)
case None => unexpected(message)
}
}
implicit def validateOption[T](o: Option[T]): ValidateOption[T] = ValidateOption(o)
}
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