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module Eval
( evalMain
) where
import Binary
import Control.Exception
import Control.Monad.State
import qualified Control.Monad.State.Strict as StrictState
import qualified Data.BitString as Bit
import qualified Data.ByteString as Byte
import Data.List
import Debug.Trace
import Helper
import Parser
import Paths_bruijn
import Reducer
import System.Console.Haskeline
import System.Console.Haskeline.Completion
import System.Directory
import System.Environment
import System.Exit
import System.IO
import Text.Megaparsec hiding ( State
, try
)
data EnvState = EnvState
{ _env :: Environment
}
type M = StrictState.StateT EnvState IO
loadFile :: String -> IO EnvState
loadFile path = do
file <- try $ readFile path :: IO (Either IOError String)
case file of
Left exception -> print (exception :: IOError) >> pure (EnvState [])
Right file -> eval (filter (not . null) $ lines file) (EnvState []) False
evalVar :: String -> Program (Failable Expression)
evalVar var = state $ \e ->
( case lookup var e of
Nothing -> Left $ UndeclaredFunction var
Just x -> Right x
, e
)
evalApp :: Expression -> Expression -> Program (Failable Expression)
evalApp f g =
evalExp f
>>= (\case
Left e -> pure $ Left e
Right f' -> fmap (Application f') <$> evalExp g
)
evalExp :: Expression -> Program (Failable Expression)
evalExp idx@(Bruijn _ ) = pure $ Right idx
evalExp ( Variable var) = evalVar var
evalExp ( Abstraction exp) = evalExp exp >>= pure . fmap Abstraction
evalExp ( Application f g) = evalApp f g
evalDefine :: String -> Expression -> Program (Failable Expression)
evalDefine name exp =
evalExp exp
>>= (\case
Left e -> pure $ Left e
Right f -> modify ((name, f) :) >> pure (Right f)
)
evalTest :: Expression -> Expression -> Program (Failable Instruction)
evalTest exp1 exp2 =
evalExp exp1
>>= (\case
Left exp1 -> pure $ Left exp1
Right exp1 -> fmap (Test exp1) <$> evalExp exp2
)
eval :: [String] -> EnvState -> Bool -> IO EnvState
eval [] state@(EnvState env) _ = return state
eval [""] state@(EnvState env) _ = return state
eval (line : ls) state@(EnvState env) isRepl =
handleInterrupt (putStrLn "<aborted>" >> return state)
$ case parse lineParser "" line of
Left err -> putStrLn (errorBundlePretty err) >> eval ls state isRepl
Right instr -> case instr of
Define name exp ->
let (res, env') = evalDefine name exp `runState` env
in case res of
Left err ->
putStrLn (show err) >> eval ls (EnvState env') isRepl
Right _ -> if isRepl
then (putStrLn $ name <> " = " <> show exp)
>> return (EnvState env')
else eval ls (EnvState env') isRepl
Import path -> do
lib <- getDataFileName path -- TODO: Use actual lib directory
exists <- doesFileExist lib
loadFile $ if exists then lib else path
Evaluate exp ->
let (res, env') = evalExp exp `runState` env
in
putStrLn
(case res of
Left err -> show err
Right exp ->
"<> "
<> (show exp)
<> "\n*> "
<> (show reduced)
<> (if likeTernary reduced
then
"\t(" <> (show $ ternaryToDecimal reduced) <> ")"
else ""
)
where reduced = reduce exp
)
>> eval ls state isRepl
Test exp1 exp2 ->
let (res, _) = evalTest exp1 exp2 `runState` env
in case res of
Left err -> putStrLn (show err) >> pure state
Right (Test exp1' exp2') ->
when
(reduce exp1' /= reduce exp2')
( putStrLn
$ "ERROR: test failed: "
<> (show exp1)
<> " != "
<> (show exp2)
)
>> eval ls state isRepl
_ -> eval ls state isRepl
where lineParser = if isRepl then parseReplLine else parseLine
evalFunc :: String -> Environment -> Maybe Expression
evalFunc func env = do
exp <- lookup func env
pure $ reduce exp
evalFile :: String -> (a -> IO ()) -> (Expression -> a) -> IO ()
evalFile path write conv = do
EnvState env <- loadFile path
case evalFunc "main" env of
Nothing -> putStrLn $ "ERROR: main function not found"
Just exp -> write $ conv exp
exec :: String -> (String -> IO (Either IOError a)) -> (a -> String) -> IO ()
exec path read conv = do
file <- read path
case file of
Left exception -> print (exception :: IOError)
Right file -> print $ reduce $ fromBinary $ conv file
repl :: EnvState -> InputT M ()
repl state =
(handleInterrupt (return $ Just "") $ withInterrupt $ getInputLine
"\ESC[36mλ\ESC[0m "
)
>>= (\case
Nothing -> return ()
Just line -> do
state <- (liftIO $ eval [line] state True)
lift (StrictState.put state)
repl state
)
lookupCompletion :: String -> M [Completion]
lookupCompletion str = do
(EnvState env) <- StrictState.get
return $ map (\(s, _) -> Completion s s False) $ filter
(\(s, _) -> str `isPrefixOf` s)
env
completionSettings :: String -> Settings M
completionSettings history = Settings
{ complete = completeWord Nothing " \n" lookupCompletion
, historyFile = Just history
, autoAddHistory = True
}
runRepl :: IO ()
runRepl = do
config <- getDataFileName "config"
history <- getDataFileName "history"
prefs <- readPrefs config
let looper = runInputTWithPrefs prefs
(completionSettings history)
(withInterrupt $ repl (EnvState []))
code <- StrictState.evalStateT looper (EnvState [])
return code
usage :: IO ()
usage = putStrLn "Invalid arguments. Use 'bruijn [file]' instead"
evalMain :: IO ()
evalMain = do
args <- getArgs
case args of
[] -> runRepl
["-c", path] -> evalFile path
(Byte.putStr . Bit.realizeBitStringStrict)
(toBitString . toBinary)
["-C", path] -> evalFile path putStrLn toBinary
["-e", path] ->
exec path (try . Byte.readFile) (fromBitString . Bit.bitString)
["-E", path] -> exec path (try . readFile) id
['-' : _] -> usage
[path ] -> evalFile path print id
_ -> usage
|
