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• scodec-core_2.13.0-M5
• 1.11.2
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• RecoverCodec.scala

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scodec.codecs.RecoverCodec.scala Maven / Gradle / Ivy

package scodec
package codecs

import scodec.bits.BitVector

private[codecs] final class RecoverCodec(target: Codec[Unit], lookahead: Boolean) extends Codec[Boolean] {

  def sizeBound = target.sizeBound

  def encode(a: Boolean)= if(a) target.encode(()) else Attempt.successful(BitVector.empty)

  def decode(buffer: BitVector) =
    target.decode(buffer) match {
      case Attempt.Successful(DecodeResult(_, rest)) => Attempt.successful(DecodeResult(true, if (lookahead) buffer else rest))
      case f: Attempt.Failure => Attempt.successful(DecodeResult(false, buffer))
    }

  override def toString = if (lookahead) s"lookahead($target)" else s"recover($target)"
}