1 files changed, 33 insertions, 0 deletions
diff --git a/scala/step0_repl.scala b/scala/step0_repl.scala
new file mode 100644
index 0000000..5ec94fe
--- /dev/null
+++ b/scala/step0_repl.scala
@@ -0,0 +1,33 @@
+object step0_repl {
+  def READ(str: String): String = {
+    str
+  }
+
+  def EVAL(str: String, env: String): String = {
+    str
+  }
+
+  def PRINT(str: String): String = {
+    str
+  }
+
+  def REP(str: String): String = {
+    PRINT(EVAL(READ(str), ""))
+  }
+
+  def main(args: Array[String]) {
+    var line:String = null
+    while ({line = readLine("user> "); line != null}) {
+      try {
+        println(REP(line))
+      } catch {
+        case e : Exception => {
+          println("Error: " + e.getMessage)
+          println("    " + e.getStackTrace.mkString("\n    "))
+        }
+      }
+    }
+  }
+}
+
+// vim: ts=2:sw=2