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|
module Brainfuck.Parser (
BrainfuckProgram,
BrainCom(..),
parseBrainfuck
) where
import Control.Applicative( some )
import Text.ParserCombinators.Parsec
type BrainfuckProgram = [BrainCom]
data BrainCom = R | L | Inc | Dec | Out | In | OpenLoop | CloseLoop
deriving (Show, Eq)
parseBrainfuck :: String -> Either ParseError BrainfuckProgram
parseBrainfuck = parse brainfuck "error"
brainfuck = do
many commentChar
bs <- many fuck
eof
return . concat $ bs
fuck = (brainCommand >>= return . (:[]))
<|> loop
<?> "brainfuck command"
loop = do
char '['
many commentChar
bs <- many brainCommand
char ']'
many commentChar
return . concat $ [[OpenLoop],bs,[CloseLoop]]
brainCommand = do { b <- brainCom; many commentChar; return b }
brainCom = (char '>' >> return R)
<|> (char '<' >> return L)
<|> (char '+' >> return Inc)
<|> (char '-' >> return Dec)
<|> (char '.' >> return Out)
<|> (char ',' >> return In)
<?> "brainfuck command"
commentChar = noneOf "><+-.,[]"
|
