Added evaluateExp and builtin to InterpreterAPI. Check for EOF in interactive transfer interpreter mode.

transfer/run_core.hs

@@ -1,14 +1,22 @@
 import Transfer.InterpreterAPI
+import Transfer.Interpreter (prEnv)
 
+import Control.Monad (when)
 import Data.List (partition, isPrefixOf)
 import System.Environment (getArgs)
+import System.IO (isEOF)
 
 interpretLoop :: Env -> IO ()
-interpretLoop env = do    
-                    line <- getLine
-                    r <- evaluateString env line
-                    putStrLn r
-                    interpretLoop env
+interpretLoop env = 
+    do
+    eof <- isEOF
+    if eof
+       then return ()
+       else do
+            line <- getLine
+            r <- evaluateString env line
+            putStrLn r
+            interpretLoop env
 
 runMain :: Env -> IO ()
 runMain env = do
@@ -21,6 +29,9 @@ main = do args <- getArgs
           env <- case files of
             [f] -> loadFile f
             _   -> fail "Usage: run_core [-i] <file>"
+          when ("-v" `elem` flags) $ do
+                                     putStrLn "Top-level environment:"
+                                     putStrLn (prEnv env)
           if "-i" `elem` flags 
             then interpretLoop env
             else runMain env