readExpr function to check whether the input matches symbol

[my-scheme.git] / app / Main.hs

diff --git a/app/Main.hs b/app/Main.hs
index 16e49391cac7ef3f27a6cf3c0abffab9d0fe3794..a94dc2ce2355835c62533047f14994df94f28319 100644 (file)
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,7 +1,16 @@
 module Main where
+import Text.ParserCombinators.Parsec
 import System.Environment
 
+symbol :: Parser Char
+symbol = oneOf "!#$%&|*+-/:<=>?@^_~"
+
+readExpr :: String -> String
+readExpr input = case parse symbol "lisp" input of
+    Left err -> "No match: " ++ show err
+    Right val -> "Found value"
+
 main :: IO ()
 main = do
-    args <- getArgs
-    putStrLn (show (read (args !! 0) + read (args !! 1)))
+    args <- getLine
+    putStrLn (readExpr args)