X-Git-Url: https://git.rmz.io/my-scheme.git/blobdiff_plain/aeb011a6698da3d7842fd5fd998eac54a0cf135a..0a6833657330f8514c235e672b1d4dc6e1ec7ad5:/app/Main.hs

diff --git a/app/Main.hs b/app/Main.hs
index 58017c5..cea4c9b 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -9,6 +9,7 @@ data LispVal = Atom String
              | Number Integer
              | String String
              | Bool Bool
+             deriving Show
 
 symbol :: Parser Char
 symbol = oneOf "!#$%&|*+-/:<=>?@^_~"
@@ -17,11 +18,11 @@ spaces :: Parser ()
 spaces = skipMany space
 
 parseString :: Parser LispVal
-parseString = do
-    char '"'
-    x <- many (noneOf "\"")
-    char '"'
-    return $ String x
+parseString = do char '"'
+                 x <- many innerChar
+                 char '"'
+                 return $ String x
+              where innerChar = noneOf "\""
 
 parseAtom :: Parser LispVal
 parseAtom = do
@@ -34,7 +35,9 @@ parseAtom = do
                 _    -> Atom atom
 
 parseNumber :: Parser LispVal
-parseNumber = liftM (Number . read) $ many1 digit
+parseNumber = do ds <- many1 digit
+                 let a = read ds
+                 return $ Number a
 
 parseExpr :: Parser LispVal
 parseExpr = parseString
@@ -44,9 +47,10 @@ parseExpr = parseString
 readExpr :: String -> String
 readExpr input = case parse parseExpr "lisp" input of
     Left err -> "No match: " ++ show err
-    Right val -> "Found value"
+    Right val -> "Found value: " ++ show val
 
 main :: IO ()
 main = do
     args <- getLine
     putStrLn (readExpr args)
+    main