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package dotty.tools.dotc
package transform
import core._
import Names._
import Types._
import TreeTransforms.{TransformerInfo, TreeTransform, TreeTransformer}
import ast.Trees.flatten
import Flags._
import Contexts.Context
import Symbols._
import Denotations._, SymDenotations._
import Decorators.StringInterpolators
import scala.collection.mutable
import DenotTransformers._
import Names.Name
import NameOps._
import TypeUtils._
/** A transformer that removes repeated parameters (T*) from all types, replacing
* them with Seq types.
*/
class ElimRepeated extends TreeTransform with InfoTransformer { thisTransformer =>
import ast.tpd._
override def name = "elimrepeated"
def transformInfo(tp: Type, sym: Symbol)(implicit ctx: Context): Type =
elimRepeated(tp)
private def elimRepeated(tp: Type)(implicit ctx: Context): Type = tp.stripTypeVar match {
case tp @ MethodType(paramNames, paramTypes) =>
val resultType1 = elimRepeated(tp.resultType)
val paramTypes1 =
if (paramTypes.nonEmpty && paramTypes.last.isRepeatedParam) {
paramTypes.init :+
paramTypes.last.translateParameterized(defn.RepeatedParamClass, defn.SeqClass)
}
else paramTypes
tp.derivedMethodType(paramNames, paramTypes1, resultType1)
case tp: PolyType =>
tp.derivedPolyType(tp.paramNames, tp.paramBounds, elimRepeated(tp.resultType))
case tp =>
tp
}
def transformTypeOfTree(tree: Tree)(implicit ctx: Context): Tree =
tree.withType(elimRepeated(tree.tpe))
override def transformIdent(tree: Ident)(implicit ctx: Context, info: TransformerInfo): Tree =
transformTypeOfTree(tree)
override def transformSelect(tree: Select)(implicit ctx: Context, info: TransformerInfo): Tree =
transformTypeOfTree(tree)
override def transformApply(tree: Apply)(implicit ctx: Context, info: TransformerInfo): Tree =
transformTypeOfTree(tree)
override def transformTypeApply(tree: TypeApply)(implicit ctx: Context, info: TransformerInfo): Tree =
transformTypeOfTree(tree)
}
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