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Compiler for the SubScript extension of the Scala Programming Language

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package scala.reflect.macros
package contexts

trait Internals extends scala.tools.nsc.transform.TypingTransformers {
  self: Context =>

  import global._

  lazy val internal: ContextInternalApi = new global.SymbolTableInternal with ContextInternalApi {
    val enclosingOwner = callsiteTyper.context.owner

    class HofTransformer(hof: (Tree, TransformApi) => Tree) extends Transformer {
      val api = new TransformApi {
        def recur(tree: Tree): Tree = hof(tree, this)
        def default(tree: Tree): Tree = superTransform(tree)
      }
      def superTransform(tree: Tree) = super.transform(tree)
      override def transform(tree: Tree): Tree = hof(tree, api)
    }

    def transform(tree: Tree)(transformer: (Tree, TransformApi) => Tree): Tree = new HofTransformer(transformer).transform(tree)

    class HofTypingTransformer(hof: (Tree, TypingTransformApi) => Tree) extends TypingTransformer(callsiteTyper.context.unit) { self =>
      currentOwner = callsiteTyper.context.owner
      curTree = EmptyTree
      localTyper = global.analyzer.newTyper(callsiteTyper.context.make(unit = callsiteTyper.context.unit))

      val api = new TypingTransformApi {
        def recur(tree: Tree): Tree = hof(tree, this)
        def default(tree: Tree): Tree = superTransform(tree)
        def atOwner[T](owner: Symbol)(op: => T): T = self.atOwner(owner)(op)
        def atOwner[T](tree: Tree, owner: Symbol)(op: => T): T = self.atOwner(tree, owner)(op)
        def currentOwner: Symbol = self.currentOwner
        def typecheck(tree: Tree): Tree = localTyper.typed(tree)
      }
      def superTransform(tree: Tree) = super.transform(tree)
      override def transform(tree: Tree): Tree = hof(tree, api)
    }

    def typingTransform(tree: Tree)(transformer: (Tree, TypingTransformApi) => Tree): Tree = new HofTypingTransformer(transformer).transform(tree)

    def typingTransform(tree: Tree, owner: Symbol)(transformer: (Tree, TypingTransformApi) => Tree): Tree = {
      val trans = new HofTypingTransformer(transformer)
      trans.atOwner(owner)(trans.transform(tree))
    }
  }
}