package dotty.tools.dotc
package transform

import core._
import TypeErasure.ErasedValueType
import Types._
import Contexts._
import Symbols._
import Decorators._
import StdNames.nme
import NameOps._
import language.implicitConversions

object TypeUtils {
  implicit def decorateTypeUtils(tpe: Type): TypeUtils = new TypeUtils(tpe)
}

/** A decorator that provides methods on types
 *  that are needed in the transformer pipeline.
 */
class TypeUtils(val self: Type) extends AnyVal {
  import TypeUtils._

  def isErasedValueType(implicit ctx: Context): Boolean =
    self.isInstanceOf[ErasedValueType]

  def isPrimitiveValueType(implicit ctx: Context): Boolean =
    self.classSymbol.isPrimitiveValueClass

  def ensureMethodic(implicit ctx: Context): Type = self match {
    case self: MethodicType => self
    case _ => if (ctx.erasedTypes) MethodType(Nil, self) else ExprType(self)
  }
}