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ãHaskellã§Lispãæ¸ãæ¥è¨ / evalã®ä½æï¼å¤æ°ç·¨ï¼ Lisp ã¯å®ç¾©ãããå¤ããã¼ãã«ã«ç»é²ãããããæ¤ç´¢ãã¦ããããã§ãã import Text.ParserCombinators.Parsec data Sexp = Nil | Symbol String | N Integer | Cons Sexp Sexp deriving Show {- ãªã¹ãã®åä½ãè¦ããããã«Showã¤ã³ã¹ã¿ã³ã¹ã¯ç¡å¹ã«ããã instance Show Sexp where show (Nil) = "()" show (N a) = show a show (Symbol a) = a show (Cons a b) = "(" ++ show a ++ showCdr b ++ ")" showCdr (Nil) = "" showCdr (Cons a b) = " " ++ s
ãHaskellã§Lispãæ¸ãæ¥è¨ããåçµããªããèªãã§ã¿ã¾ãã import Text.ParserCombinators.Parsec import Debug.Trace data Sexp = Nil | Symbol String |Cons Sexp Sexp deriving Show ShowãRead ã¯ã©ã¹ã®ã¤ã³ã¹ã¿ã³ã¹ãå®ç¾©ãã¦ããã¾ããSexpåãã¼ã¿ã®ç¢ºèªãããããã«çç¥ãã¦åä½ããã¦ã¿ã¾ãã -- Så¼ç¨ãã¼ãµ:Så¼ã¯ã¢ãã ããªã¹ãã®ã©ã¡ããã sexpParser :: Parser Sexp sexpParser = spaces >> ( do { string "("; listParser } <|> do { string "'"; a <- sexpParser; return (Cons (Symbol "quote")(Cons a Nil)
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