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| module BFLike | |
| (run, interpret, tobc, eval) where | |
| import Data.Char | |
| qqq :: (a, b, c) -> d -> (a, b, c, d) | |
| qqq (a, b, c) d = (a, b, c, d) | |
| run' :: ([Char], [Int], Int) -> Int -> ([Char], [Int], Int) | |
| run' (value, state, ptr) inst = | |
| case inst of | |
| '+' -> (value, (take ptr state) ++ [(state !! ptr) + 1] ++ (drop (ptr + 1) state), ptr) | |
| '-' -> (value, (take ptr state) ++ [(state !! ptr) - 1] ++ (drop (ptr + 1) state), ptr) | |
| '>' -> (value, if length state == ptr + 1 then state ++ [0] else state, ptr + 1) | |
| '<' -> (value, state, ptr - 1) | |
| '.' -> (value ++ [chr $ state !! ptr], state, ptr) | |
| while :: ([Char], [Int], Int, (Bool, [Int])) -> ([Char], [Int], Int, (Bool, [Int])) | |
| while (value, state, ptr, rc) = | |
| if state' !! ptr' < 1 | |
| then (value', state', ptr', (False, [])) | |
| else while (value', state', ptr', rc) | |
| where (value', state', ptr', rc') = foldl run (value, state, ptr, (False, [])) (snd rc) | |
| run :: ([Char], [Int], Int, (Bool, [Int])) -> Int -> ([Char], [Int], Int, (Bool, [Int])) | |
| run (value, state, ptr, rc) inst = | |
| if fst rc | |
| then | |
| case inst of | |
| '[' -> while (value, state, ptr, (False, snd rc)) | |
| _ -> (value, state, ptr, (True, (snd rc) ++ [inst])) | |
| else | |
| case inst of | |
| ']' -> (value, state, ptr, (True, [])) | |
| _ -> qqq (run' (value, state, ptr) inst) rc | |
| interpret :: [Int] -> [Char] | |
| interpret l = value where (value, state, ptr, rc) = foldl run ([], [0], 0, (False, [])) l | |
| eval :: [Char] -> [Char] | |
| eval = interpret |
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