X-Git-Url: https://git.rmz.io/my-scheme.git/blobdiff_plain/429ac1845f1b93f54bca8511a4efbf8cbcbb9bf3..7495ece1a44cd1a8cccae2bdbc61fa6873f106d2:/app/Main.hs

diff --git a/app/Main.hs b/app/Main.hs
index 8520891..6daf522 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,13 +1,41 @@
 module Main where
+import Control.Monad
 import Text.ParserCombinators.Parsec hiding (spaces)
 import System.Environment
 
+data LispVal = Atom String
+             | List [LispVal]
+             | DottedList [LispVal] LispVal
+             | Number Integer
+             | String String
+             | Bool Bool
+
 symbol :: Parser Char
 symbol = oneOf "!#$%&|*+-/:<=>?@^_~"
 
 spaces :: Parser ()
 spaces = skipMany space
 
+parseString :: Parser LispVal
+parseString = do
+    char '"'
+    x <- many (noneOf "\"")
+    char '"'
+    return $ String x
+
+parseAtom :: Parser LispVal
+parseAtom = do
+    a <- letter <|> symbol
+    b <- many (letter <|> digit <|> symbol)
+    let atom = a:b
+    return $ case atom of
+                "#t" -> Bool True
+                "#f" -> Bool False
+                _    -> Atom atom
+
+parseNumber :: Parser LispVal
+parseNumber = liftM (Number . read) $ many1 digit
+
 readExpr :: String -> String
 readExpr input = case parse (spaces >> symbol) "lisp" input of
     Left err -> "No match: " ++ show err