Initial commit

1 files changed, 37 insertions, 0 deletions

diff --git a/src/dotty/tools/dotc/core/Decorators.scala b/src/dotty/tools/dotc/core/Decorators.scala
new file mode 100644
index 000000000..ba3123358
--- /dev/null
+++ b/src/dotty/tools/dotc/core/Decorators.scala
@@ -0,0 +1,37 @@
+package dotty.tools.dotc
+package core
+
+import Contexts._, Names._
+
+object Decorators {
+
+  implicit class toTypeNameDecorator(val s: String) extends AnyVal {
+    def toTypeName(implicit context: Context): TypeName =
+      context.names.newTypeName(s)
+  }
+
+  implicit class toTermNameDecorator(val s: String) extends AnyVal {
+    def toTermName(implicit context: Context): TermName =
+      context.names.newTermName(s)
+  }
+
+  final val MaxRecursions = 1000
+
+  implicit class ListDecorator[T](val xs: List[T]) extends AnyVal {
+    def filterConserve(p: T => Boolean): List[T] = {
+      def loop(xs: List[T], nrec: Int): List[T] = xs match {
+        case Nil => xs
+        case x :: xs1 =>
+          if (nrec < MaxRecursions) {
+            val ys1 = loop(xs1, nrec + 1)
+            if (p(x))
+              if (ys1 eq xs1) xs else x :: ys1
+            else
+              ys1
+          } else xs filter p
+      }
+      loop(xs, 0)
+    }
+  }
+}
+