X-Git-Url: https://git.rmz.io/my-scheme.git/blobdiff_plain/b95d19b43830747d76eab4c01805ef531e897795..537e327f072fb094316845a5e3105f4fbb1aa385:/app/Main.hs

diff --git a/app/Main.hs b/app/Main.hs
index a94dc2c..88ae7f7 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -1,12 +1,50 @@
 module Main where
-import Text.ParserCombinators.Parsec
+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 = many1 digit >>= \ ds ->
+              let a = read ds
+              in return $ Number a
+
+parseExpr :: Parser LispVal
+parseExpr = parseString
+        <|> parseAtom
+        <|> parseNumber
+
 readExpr :: String -> String
-readExpr input = case parse symbol "lisp" input of
+readExpr input = case parse parseExpr "lisp" input of
     Left err -> "No match: " ++ show err
     Right val -> "Found value"