33 lines
1.1 KiB
Haskell
33 lines
1.1 KiB
Haskell
{-# LANGUAGE OverloadedStrings, NamedFieldPuns #-}
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module Evaluate where
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import Base (State(..), BFAction(..))
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import Memory
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import Formatter
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import qualified Data.HashMap as HM
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import qualified Data.Text as T
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import qualified Data.Text.IO as T
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type ActionResult = (State, Maybe (IO ()))
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processAction :: State -> BFAction -> ActionResult
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processAction s@State {pointer, memory, codePos, jumpTable} instruction = let
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noIO :: State -> ActionResult
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noIO s = (s, Nothing)
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jump :: ActionResult
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jump = case HM.lookup codePos jumpTable of
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Just jumpTo -> noIO $ s { pointer = jumpTo }
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Nothing -> (s, Just $ T.putStrLn "ERROR: no matching jump point")
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in case instruction of
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MoveRight -> noIO $ s { pointer = pointer + 1 }
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MoveLeft -> noIO $ s { pointer = pointer - 1 }
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Increment -> noIO $ s { memory = increment memory pointer }
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Decrement -> noIO $ s { memory = decrement memory pointer }
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Replace -> noIO $ s { memory = setMemAdr memory pointer $ getMemAdr memory $ getMemAdr memory pointer }
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Print -> (s, Just $ prettyPrintState' s)
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JumpRight -> jump
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JumpLeft -> jump
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