From 50958fc5f2aad6f72fa8b948f8fa33713beb91a1 Mon Sep 17 00:00:00 2001
From: Jed Barber <jjbarber@y7mail.com>
Date: Tue, 18 Feb 2014 01:10:00 +1100
Subject: Added basic command line programs to invoke Fractran and Thue
 interpreters

---
 fractran.hs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 fractran.hs

(limited to 'fractran.hs')

diff --git a/fractran.hs b/fractran.hs
new file mode 100644
index 0000000..7f3946f
--- /dev/null
+++ b/fractran.hs
@@ -0,0 +1,38 @@
+
+import System.Environment( getArgs )
+import Data.Typeable
+import qualified Control.Exception
+import Fractran.Parser
+import Fractran.Interpreter
+
+
+data FractranException = FractranException { errString :: String }
+    deriving (Show, Typeable)
+
+instance Control.Exception.Exception FractranException
+
+
+
+usageString :: String
+usageString = "Usage: fractran <program file>"
+
+
+
+program :: IO ()
+program = do
+	args <- getArgs
+	fileContents <- if (length args /= 1)
+		            then Control.Exception.throw (FractranException usageString)
+		            else readFile (head args)
+
+	case (parseFractran fileContents) of
+		Left x -> putStrLn (show x)
+		Right x -> putStrLn (show (fractran x))
+
+
+
+main = Control.Exception.catch program handler
+        where
+        	handler :: FractranException -> IO ()
+        	handler err = putStrLn (errString err)
+
-- 
cgit