mirror of https://github.com/sbt/sbt.git
29 lines
776 B
Scala
29 lines
776 B
Scala
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package sbt
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sealed trait Settings
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{
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def get[T](key: AttributeKey[T], path: List[String]): Option[T]
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def set[T](key: AttributeKey[T], path: List[String], value: T): Settings
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}
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object Settings
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{
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def empty: Settings = new Basic(Map.empty)
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def x = 3
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private[this] class Basic(val roots: Map[ List[String], AttributeMap ]) extends Settings
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{
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def get[T](key: AttributeKey[T], path: List[String]): Option[T] =
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{
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def notFound = path match {
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case Nil => None
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case x :: xs => get(key, xs)
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}
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(roots get path) flatMap ( _ get key ) orElse notFound
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}
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def set[T](key: AttributeKey[T], path: List[String], value: T): Settings =
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{
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val amap = (roots get path) getOrElse AttributeMap.empty
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new Basic( roots updated(path, amap put(key, value)) )
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}
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}
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}
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