53 lines
2.1 KiB
Scala
53 lines
2.1 KiB
Scala
package snake
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import java.nio.file.{Files, Paths}
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/** Loads shared fixtures from ../fixtures/<name>.json and decodes them into the course's types. */
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object Fixtures:
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private val dir = Paths.get(sys.props.getOrElse("user.dir", ".")).resolve("..").resolve("fixtures").normalize
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def load(name: String): ujson.Value =
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ujson.read(Files.readString(dir.resolve(s"$name.json")))
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/** The cases array of a fixture. */
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def cases(name: String): Seq[ujson.Value] = load(name)("cases").arr.toSeq
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/** Decode a nullable JSON value into an Option. */
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def opt[A](v: ujson.Value)(f: ujson.Value => A): Option[A] =
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if v.isNull then None else Some(f(v))
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def point(v: ujson.Value): Point = Point(v("x").num.toInt, v("y").num.toInt)
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def direction(v: ujson.Value): Direction = Direction.valueOf(v.str)
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def status(v: ujson.Value): Status = Status.valueOf(v.str)
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def action(v: ujson.Value): Action = v("tag").str match
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case "Tick" => Action.Tick
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case "Turn" => Action.Turn(direction(v("dir")))
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case "TogglePause" => Action.TogglePause
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case "Restart" => Action.Restart
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case "Frame" => Action.Frame
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case other => throw new IllegalArgumentException(s"unknown action tag: $other")
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def gameState(v: ujson.Value): GameState = GameState(
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width = v("width").num.toInt,
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height = v("height").num.toInt,
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snake = v("snake").arr.toList.map(point),
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dir = direction(v("dir")),
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nextDir = direction(v("nextDir")),
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apple = opt(v("apple"))(point),
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seed = v("seed").num.toLong,
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score = v("score").num.toInt,
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status = status(v("status")),
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frame = v("frame").num.toInt
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)
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def shape(v: ujson.Value): Shape = v("tag").str match
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case "Rect" => Shape.Rect(v("x").num.toInt, v("y").num.toInt, v("w").num.toInt, v("h").num.toInt, v("color").str)
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case "Text" =>
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Shape.Text(v("x").num.toInt, v("y").num.toInt, v("text").str, v("color").str, v("size").num.toInt, v("align").str)
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case other => throw new IllegalArgumentException(s"unknown shape tag: $other")
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def list[A](v: ujson.Value)(f: ujson.Value => A): List[A] = v.arr.toList.map(f)
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