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Instruction.scala
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Instruction.scala
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/*
* Copyright 2015 Creative Scala
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package doodle
package turtle
import doodle.core.Angle
sealed abstract class Instruction extends Product with Serializable
object Instruction {
final case class Forward(distance: Double) extends Instruction
final case class Turn(angle: Angle) extends Instruction
final case class Branch(instructions: List[Instruction]) extends Instruction {
def +:(instruction: Instruction): Branch =
Branch(instruction +: instructions)
def :+(instruction: Instruction): Branch =
Branch(instructions :+ instruction)
def ++(is: List[Instruction]): Branch =
Branch(instructions ++ is)
}
case object NoOp extends Instruction
def forward(distance: Double): Instruction =
Forward(distance)
def turn(angle: Angle): Instruction =
Turn(angle)
def branch(instructions: Instruction*): Branch =
Branch(instructions.toList)
val noop: Instruction =
NoOp
}