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-rw-r--r--src/grasp.hs30
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 ()) ]
+