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package mill.discover
import mill.define._
import ammonite.main.Router
import ammonite.main.Router.EntryPoint
import mill.discover.Mirror.TargetPoint
import mill.util.Ctx.Loader
import mill.util.Strict.OSet
import scala.language.experimental.macros
import scala.reflect.macros.blackbox.Context
/**
* Allows you to implicitly summon up a build [[Mirror]] for arbitrary types
*/
class Discovered[T](val mirror: Mirror[T, T]){
def mapping(t: T) = Discovered.Mapping(mirror, t)
}
object Discovered {
object Mapping extends Loader[Mapping[_]] {
// Magically injected by the `Evaluator`, rather than being constructed here
def make() = ???
}
case class Mapping[T](mirror: Mirror[T, T],
base: T){
val modulesToMirrors = Mirror.traverseNode[T, T, (Any, Mirror[_, _])](base, mirror){
(mirror, segments, resolvedNode) => Seq(resolvedNode -> mirror)
}.toMap
val targets = OSet.from(
Mirror.traverseNode(base, mirror){ (mirror, segmentsRev, resolvedNode) =>
for(target <- mirror.targets)
yield target.asInstanceOf[TargetPoint[Any, Any]].run(resolvedNode)
}
)
val segmentsToCommands = Mirror.traverse[T, T, (Segments, EntryPoint[_])](base, mirror){ (mirror, segments) =>
for(command <- mirror.commands)
yield segments ++ Seq(Segment.Label(command.name)) -> command
}.toMap
val segmentsToTargets = targets.map(t => (t.ctx.segments, t)).toMap
val targetsToSegments = segmentsToTargets.map(_.swap)
}
def consistencyCheck[T](mapping: Discovered.Mapping[T]): OSet[Segments] = {
val mapping2 = Discovered.Mapping(mapping.mirror, mapping.base)
for{
(t1, t2) <- mapping2.targets.zip(mapping.targets)
if t1 ne t2
} yield t1.ctx.segments
}
def make[T]: Discovered[T] = macro applyImpl[T]
def mapping[T](t: T): Discovered.Mapping[T] = macro mappingImpl[T]
def tupleLeft[T, V](items: List[(T, V)]) = items.map(_._1)
def mappingImpl[T: c.WeakTypeTag](c: Context)(t: c.Expr[T]): c.Expr[Discovered.Mapping[T]] = {
import c.universe._
c.Expr[Discovered.Mapping[T]](q"${applyImpl[T](c)}.mapping($t)")
}
def applyImpl[T: c.WeakTypeTag](c: Context): c.Expr[Discovered[T]] = {
import c.universe._
val baseType = c.weakTypeTag[T].tpe
def rec(segments: List[Option[String]],
t: c.Type): Tree = {
val r = new Router(c)
val targets = for {
m <- t.members.toList
if m.isMethod &&
m.typeSignature.paramLists.isEmpty &&
m.typeSignature.resultType <:< c.weakTypeOf[Target[_]] &&
!m.name.toString.contains(' ') &&
m.isPublic
} yield {
val x = Ident(TermName(c.freshName()))
val t = q"""mill.discover.Mirror.TargetPoint(
${m.name.toString},
($x: ${m.typeSignature.resultType}) => $x.${m.name.toTermName}
)"""
c.internal.setPos(t, m.pos)
t
}
val crossChildren =
if (!(t <:< c.weakTypeOf[Cross[_]])) q"None"
else {
val TypeRef(_, _, Seq(arg)) = t.baseType(weakTypeOf[Cross[_]].typeSymbol)
val innerMirror = rec(None :: segments, arg)
q"Some(((c: mill.define.Cross[_]) => mill.discover.Discovered.tupleLeft(c.items), $innerMirror))"
}
val childHierarchies = for{
m <- t.members.toList
if m.typeSignature.paramLists.isEmpty && m.isPublic
if (m.typeSignature.finalResultType <:< c.weakTypeOf[Module]) ||
(m.typeSignature.finalResultType <:< c.weakTypeOf[Cross[_]])
} yield {
val name = m.name.toString.trim
q"($name, ${rec(Some(name) :: segments, m.typeSignature.finalResultType)})"
}
val crossName = q"${TermName(c.freshName())}"
val hierarchySelector = {
val base = q"${TermName(c.freshName())}"
val ident = segments.reverse.zipWithIndex.foldLeft[Tree](base) {
case (prefix, (Some(name), i)) => q"$prefix.${TermName(name)}"
case (prefix, (None, i)) => q"$prefix.get($crossName($i))"
}
q"($base: $baseType, $crossName: List[List[Any]]) => $ident.asInstanceOf[$t]"
}
val commands =
r.getAllRoutesForClass(
t.asInstanceOf[r.c.Type],
_.returnType <:< weakTypeOf[mill.define.Command[_]].asInstanceOf[r.c.Type]
)
.asInstanceOf[Seq[c.Tree]]
.toList
q"""mill.discover.Mirror[$baseType, $t](
$hierarchySelector,
$commands,
$targets,
$childHierarchies,
$crossChildren
)"""
}
val res = q"new _root_.mill.discover.Discovered(${rec(Nil, baseType)})"
// println(res)
c.Expr[Discovered[T]](res)
}
}
|
