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