1 files changed, 62 insertions, 0 deletions
diff --git a/src/dotty/tools/dotc/reporting/diagnostic/MessageCreator.scala b/src/dotty/tools/dotc/reporting/diagnostic/MessageCreator.scala
new file mode 100644
index 000000000..d74099f4f
--- /dev/null
+++ b/src/dotty/tools/dotc/reporting/diagnostic/MessageCreator.scala
@@ -0,0 +1,62 @@
+package dotty.tools
+package dotc
+package reporting
+package diagnostic
+
+import util.{SourcePosition, NoSourcePosition}
+import core.Contexts.Context
+
+object MessageCreator {
+  implicit class DiagnosticContext(val c: Context) extends AnyVal {
+    def shouldExplain(msg: MessageCreator): Boolean = {
+      implicit val ctx: Context = c
+      msg match {
+        case NoExplanation(_) => false
+        case _ => ctx.settings.explain.value
+      }
+    }
+  }
+
+  implicit def toNoExplanation(str: String) =
+    new NoExplanation(str)
+}
+
+trait MessageCreator {
+  import messages._
+
+  def msg: String
+  def kind: String
+  def explanation: String
+
+  def error(pos: SourcePosition) =
+    new Error(msg, pos, kind, explanation)
+
+  def warning(pos: SourcePosition) =
+    new Warning(msg, pos, kind, explanation)
+
+  def info(pos: SourcePosition) =
+    new Info(msg, pos, kind, explanation)
+
+  def featureWarnign(pos: SourcePosition) =
+    new FeatureWarning(msg, pos, kind, explanation)
+
+  def uncheckedWarning(pos: SourcePosition) =
+    new UncheckedWarning(msg, pos, kind, explanation)
+
+  def deprecationWarning(pos: SourcePosition) =
+    new DeprecationWarning(msg, pos, kind, explanation)
+
+  def migrationWarning(pos: SourcePosition) =
+    new MigrationWarning(msg, pos, kind, explanation)
+}
+
+class NoExplanation(val msg: String) extends MessageCreator {
+  val explanation = ""
+  val kind = ""
+}
+
+object NoExplanation {
+  def unapply(m: MessageCreator): Option[MessageCreator] =
+    if (m.explanation == "") Some(m)
+    else None
+}