Grasp interpreter main program added, still untested

1 files changed, 30 insertions, 0 deletions

diff --git a/src/grasp.hs b/src/grasp.hs
new file mode 100644
index 0000000..4b12abd
--- /dev/null
+++ b/src/grasp.hs
@@ -0,0 +1,30 @@
+
+import System.Environment( getArgs )
+import Control.Exception( ErrorCall(..), Handler(..), catches )
+import Grasp.Parser
+import Grasp.Interpreter
+
+
+
+
+usageString :: String
+usageString = "Usage: grasp <program file>"
+
+
+
+program :: IO ()
+program = do
+    args <- getArgs
+    fileContents <- if (length args /= 1)
+                    then error usageString
+                    else readFile (head args)
+    
+    case (parseGrasp fileContents) of
+        Left x -> putStrLn (show x)
+        Right x -> grasp x >> return ()
+
+
+
+main = catches program
+               [ Handler ((\e -> putStrLn . show $ e) :: ErrorCall -> IO ()) ]
+