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-rw-r--r--src/Brainfuck/Parser.hs62
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diff --git a/src/Brainfuck/Parser.hs b/src/Brainfuck/Parser.hs
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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 "><+-.,[]"
+