86 lines
2.9 KiB
Scala
86 lines
2.9 KiB
Scala
// See LICENSE.SiFive for license details.
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package freechips.rocketchip.config
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abstract class Field[T] private (val default: Option[T])
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{
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def this() = this(None)
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def this(default: T) = this(Some(default))
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}
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abstract class View {
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final def apply[T](pname: Field[T]): T = apply(pname, this)
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final def apply[T](pname: Field[T], site: View): T = {
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val out = find(pname, site)
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require (out.isDefined, s"Key ${pname} is not defined in Parameters")
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out.get
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}
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final def lift[T](pname: Field[T]): Option[T] = lift(pname, this)
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final def lift[T](pname: Field[T], site: View): Option[T] = find(pname, site).map(_.asInstanceOf[T])
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protected[config] def find[T](pname: Field[T], site: View): Option[T]
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}
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abstract class Parameters extends View {
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final def ++ (x: Parameters): Parameters =
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new ChainParameters(this, x)
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final def alter(f: (View, View, View) => PartialFunction[Any,Any]): Parameters =
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Parameters(f) ++ this
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final def alterPartial(f: PartialFunction[Any,Any]): Parameters =
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Parameters((_,_,_) => f) ++ this
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final def alterMap(m: Map[Any,Any]): Parameters =
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new MapParameters(m) ++ this
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protected[config] def chain[T](site: View, tail: View, pname: Field[T]): Option[T]
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protected[config] def find[T](pname: Field[T], site: View) = chain(site, new TerminalView, pname)
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}
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object Parameters {
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def empty: Parameters = new EmptyParameters
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def apply(f: (View, View, View) => PartialFunction[Any,Any]): Parameters = new PartialParameters(f)
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}
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class Config(p: Parameters) extends Parameters {
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def this(f: (View, View, View) => PartialFunction[Any,Any]) = this(Parameters(f))
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protected[config] def chain[T](site: View, tail: View, pname: Field[T]) = p.chain(site, tail, pname)
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override def toString = this.getClass.getSimpleName
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def toInstance = this
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}
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// Internal implementation:
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private class TerminalView extends View {
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def find[T](pname: Field[T], site: View): Option[T] = pname.default
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}
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private class ChainView(head: Parameters, tail: View) extends View {
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def find[T](pname: Field[T], site: View) = head.chain(site, tail, pname)
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}
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private class ChainParameters(x: Parameters, y: Parameters) extends Parameters {
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def chain[T](site: View, tail: View, pname: Field[T]) = x.chain(site, new ChainView(y, tail), pname)
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}
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private class EmptyParameters extends Parameters {
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def chain[T](site: View, tail: View, pname: Field[T]) = tail.find(pname, site)
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}
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private class PartialParameters(f: (View, View, View) => PartialFunction[Any,Any]) extends Parameters {
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protected[config] def chain[T](site: View, tail: View, pname: Field[T]) = {
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val g = f(site, this, tail)
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if (g.isDefinedAt(pname)) Some(g.apply(pname).asInstanceOf[T]) else tail.find(pname, site)
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}
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}
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private class MapParameters(map: Map[Any, Any]) extends Parameters {
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protected[config] def chain[T](site: View, tail: View, pname: Field[T]) = {
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val g = map.get(pname)
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if (g.isDefined) Some(g.get.asInstanceOf[T]) else tail.find(pname, site)
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}
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}
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