refactor macro generation to use bundles when we need reuse.

Author: rssh

src/main/scala/gopher/util/ASTUtilImpl.scala

@@ -0,0 +1,21 @@
+package gopher.util
+
+import scala.reflect.macros.blackbox.Context
+
+
+trait ASTUtilImpl
+{
+  val c: Context
+  import c.universe._
+
+  def parseGuardInSelectorCaseDef(name: c.TermName, guard:c.Tree): c.Tree =
+  {
+     guard match {
+        case Apply(Select(Ident(`name`),TermName("$eq$eq")),List(expression)) =>
+               expression
+        case _ =>
+               c.abort(guard.pos, s"expected ${name}==<expression> in select guard")
+     }
+  }
+
+}