wei-k.zeroapply_2.12.0.5.1.source-code.Common.scala Maven / Gradle / Ivy

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zero cost Apply/Applicative syntax

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package zeroapply

import scala.reflect.macros.blackbox.Context

trait Common {
  val c: Context
  import c.universe._
  import Flag.PARAM

  final type W[A] = c.WeakTypeTag[A]
  protected final def w[A](implicit W: W[A]): Type = W.tpe

  protected final def tupleType(params: List[Tree], types: List[Type]): Tree = {
    AppliedTypeTree(Select(Ident(TermName("scala")), TypeName("Tuple" + params.size)), types.map(TypeTree(_)))
  }

  protected final def tuple(params: List[Tree], types: List[Type]): Tree = {
    val names = params.indices.map(i => TermName(c.freshName("p" + i))).toList
    Function(
      names.zipWithIndex.map { case (name, i) =>
        val t = TypeTree(types(i))
        ValDef(Modifiers(PARAM), name, t, EmptyTree)
      },
      Apply(Select(Ident(TermName("Tuple" + params.size)), TermName("apply")), names.map(n => Ident(n)))
    )
  }
}