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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package scanet.core | ||
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|
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| case class Path(segments: Seq[String]) { | ||
| def /(child: Path): Path = Path(segments ++ child.segments) | ||
| def startsWith(parent: Path): Boolean = segments.startsWith(parent.segments) | ||
| def endsWith(parent: Path): Boolean = segments.endsWith(parent.segments) | ||
| def relativeTo(parent: Path): Option[Path] = | ||
| if (startsWith(parent)) Some(Path(segments.drop(parent.segments.size))) else None | ||
| override def toString: String = segments.mkString("/") | ||
| } | ||
|
|
||
| object Path { | ||
| def apply(s1: String, sn: String*): Path = new Path(s1 :: sn.toList) | ||
| def parse(path: String): Path = new Path(path.split("/").toList) | ||
| implicit def stringIsPath(string: String): Path = Path.parse(string) | ||
| } | ||
|
|
||
| // convenient wrapper over Map[Path, A] to get DSL like API | ||
| case class Params[A](params: Map[Path, A]) { | ||
| def apply(path: Path): A = | ||
| params.getOrElse(path, error(s"missing $path param")) | ||
| def paths: Set[Path] = params.keySet | ||
| def children(parent: Path): Params[A] = { | ||
| val childrenParams = params.flatMap { | ||
| case (path, value) => | ||
| path.relativeTo(parent).map(child => child -> value) | ||
| } | ||
| Params(childrenParams) | ||
| } | ||
| def +(other: (Path, A)): Params[A] = Params(params + other) | ||
| def -(other: Path): Params[A] = Params(params - other) | ||
| def ++(other: Params[A]): Params[A] = | ||
| Params(params ++ other.params) | ||
| def map[B](f: (Path, A) => (Path, B)): Params[B] = | ||
| Params(params.map(f.tupled)) | ||
| def mapValues[B](f: A => B): Params[B] = | ||
| Params(params.map { case (k, v) => (k, f(v)) }) | ||
| def filter(f: (Path, A) => Boolean): Params[A] = | ||
| Params(params.filter(f.tupled)) | ||
| def filterPaths(f: Path => Boolean): Params[A] = | ||
| Params(params.filter { case (k, _) => f(k) }) | ||
| def filterValues(f: A => Boolean): Params[A] = | ||
| Params(params.filter { case (_, v) => f(v) }) | ||
| def partition(by: (Path, A) => Boolean): (Params[A], Params[A]) = { | ||
| val (left, right) = params.partition(by.tupled) | ||
| (Params(left), Params(right)) | ||
| } | ||
| def partitionPaths(by: Path => Boolean): (Params[A], Params[A]) = | ||
| partition { case (k, _) => by(k) } | ||
| def partitionValues(by: A => Boolean): (Params[A], Params[A]) = | ||
| partition { case (k, v) => by(v) } | ||
| def values: Iterable[A] = params.values | ||
| def join[B](other: Params[B]): Params[(A, B)] = { | ||
| val allPaths = paths ++ other.paths | ||
| val joinedItems = allPaths.map(path => (path, (this(path), other(path)))) | ||
| Params(joinedItems.toMap) | ||
| } | ||
| def size: Int = params.size | ||
| def isEmpty: Boolean = params.isEmpty | ||
| def prependPath(path: Path): Params[A] = | ||
| Params(params.map { case (k, v) => path / k -> v }) | ||
| def weights: A = apply(Params.Weights) | ||
| } | ||
|
|
||
| object Params { | ||
| def apply[A](elems: (Path, A)*): Params[A] = | ||
| new Params[A](Map(elems: _*)) | ||
| def empty[A]: Params[A] = | ||
| new Params[A](Map.empty) | ||
| val Weights: Path = "weights" | ||
| val State: Path = "state" | ||
| } |
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