1 files changed, 19 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/EvalLoop.scala b/src/compiler/scala/tools/nsc/EvalLoop.scala
new file mode 100644
index 0000000000..240547491a
--- /dev/null
+++ b/src/compiler/scala/tools/nsc/EvalLoop.scala
@@ -0,0 +1,19 @@
+package scala.tools.nsc;
+
+import java.io._;
+
+trait EvalLoop {
+
+  def prompt: String;
+
+  def loop(action: (String) => Unit): unit = {
+    val in = new BufferedReader(new InputStreamReader(System.in));
+    System.out.print(prompt);
+    var line = in.readLine();
+    while (line != null && line.length() > 0) {
+      action(line);
+      System.out.print(prompt);
+      line = in.readLine();
+    }
+  }
+}