diff --git a/Channel.hs b/Channel.hs new file mode 100644 --- /dev/null +++ b/Channel.hs @@ -0,0 +1,117 @@ +module Channel ( + Channel (..) , + ChannelType(..), + stdChan , + newChan , + dataBreak ) + where + +import qualified Network as N +import Network.BSD (getHostName) +import System.IO (Handle, hFlush, hGetLine, hPutStrLn, hShow) +import System.IO.Error (catchIOError) +import Control.Concurrent (forkIO,threadDelay) +import Control.Concurrent.MVar + +data Channel = Channel { + chanType :: ChannelType + , clientPort :: Integer + , send :: String -> IO () + , receive :: IO String + , extra :: [String] + } + +data ChannelType = Internal + | Std + | HTTP + | String + deriving (Eq, Show, Read) + +stdChan :: Handle -> Channel +stdChan h = Channel Std (-1) write rd [] + where + write = hPutStrLn h + rd = hGetLine h + +newChan :: ChannelType -> String -> Integer -> IO Channel +newChan t host cp = do + currentHost <- getHostName + case t of + Internal -> newInternalChan currentHost hostPort cp + HTTP + | hostName == "localhost" || hostName == currentHost -> newLocalChan t cp + | otherwise -> newForeignChan t hostName hostPort + String -> newForeignChan t hostName hostPort + where + (hostName, _:hostPort) = break (==':') host + +newInternalChan :: String -> String -> Integer -> IO Channel +newInternalChan hostName hostPort cp = return $ Channel Internal cp s r ex + where + r = N.withSocketsDo $ do + inSock <- N.listenOn $ N.PortNumber $ fromIntegral cp + (inHandle,_,_) <- N.accept inSock + msg <- hGetLine inHandle + N.sClose inSock + return msg + s v = N.withSocketsDo $ do + _ <- forkIO $ do + outHandle <- waitForConnect hostName $ N.PortNumber $ port hostPort + hPutStrLn outHandle v + return () + ex = zipWith (\a b -> (a ++ dataBreak : b)) ["host","clientPort","type"] [hostName ++ ":" ++ hostPort,show cp,show Internal] + +newLocalChan :: ChannelType -> Integer -> IO Channel +newLocalChan t cp = N.withSocketsDo $ do + hanVar <- newEmptyMVar + _ <- forkIO $ do + inSock <- N.listenOn $ N.PortNumber $ fromIntegral cp + (inHandle,_,_) <- N.accept inSock + putMVar hanVar inHandle + currentHost <- getHostName + let ex' = ex ++ ["host" ++ dataBreak :currentHost ++ ":" ++ show cp] + return $ Channel t cp (send' hanVar) (receive' hanVar) ex' + where + ex = zipWith (\a b -> (a ++ dataBreak : b)) ["clientPort","type"] [show cp,show t] + +newForeignChan :: ChannelType -> String -> String -> IO Channel +newForeignChan t hostName hostPort = N.withSocketsDo $ do + hanVar <- newEmptyMVar + _ <- forkIO $ do + outHandle <- waitForConnect hostName $ N.PortNumber $ port hostPort + putMVar hanVar outHandle + return $ Channel t 0 (send' hanVar) (receive' hanVar) ex + where + ex = zipWith (\a b -> a ++ dataBreak : b) ["host","clientPort","type"] [hostName ++ ":" ++ hostPort,"-1",show t] + +port :: String -> N.PortNumber +port s = fromIntegral (read s :: Integer) + +dataBreak :: Char +dataBreak = '#' + +waitForConnect :: N.HostName -> N.PortID -> IO Handle +waitForConnect h p = N.connectTo h p `catchIOError` + (\_ -> do + threadDelay 10000 + putStrLn "waiting for connection" + waitForConnect h p) + +send' :: MVar Handle -> String -> IO () +send' hanVar v = do + han <- takeMVar hanVar + hPutStrLn han v + hFlush han + putMVar hanVar han + +receive' :: MVar Handle -> IO String +receive' hanVar = do + han <- readMVar hanVar + msg <- hGetLine han + hFlush han + return msg + +printH :: Handle -> IO () +printH h = do + hstr <- hShow h + putStrLn hstr diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,675 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. + diff --git a/PiCalculus.hs b/PiCalculus.hs new file mode 100644 --- /dev/null +++ b/PiCalculus.hs @@ -0,0 +1,648 @@ +{-# LANGUAGE TupleSections #-} +module Main where + +import Control.Arrow (second) +import Control.Concurrent (forkIO, threadDelay) +import Control.Concurrent.MVar (newEmptyMVar, takeMVar, tryPutMVar) +import Control.Monad (liftM, liftM2, unless) +import Control.Monad.Error (throwError) +import Control.Monad.Trans (liftIO) +import Control.Monad.Trans.Except (ExceptT(..), catchE, runExceptT, throwE) +import Data.Char (toLower) +import Data.IORef (IORef, newIORef, readIORef,writeIORef) +import Data.List (intercalate) +import Data.Maybe (isJust) +import Network.HTTP.Base (Request(..), RequestMethod(..), mkRequest) +import Network.URI (parseURI) +import System.Environment (getArgs, getProgName) +import System.IO (hFlush, stderr, stdin, stdout) +import Text.ParserCombinators.Parsec + +import Data.Map (Map) +import qualified Data.Map as Map + +import Channel + +data PiProcess = Null + | In Term Term + | Out Term Term + | New Term + | PiProcess `Seq` PiProcess -- Sequential Composition + | Conc [PiProcess] -- Parallel Composition + | Replicate PiProcess -- Infinite parallel replication + | Let Term Value (Maybe PiProcess) + | If Condition PiProcess PiProcess + deriving (Eq,Show) + +data Term = TVar Name + | TStr String + | TNum Integer + | TBool Bool + | TPair (Term, Term) + | TFun Name [Term] Int + deriving (Eq) + +data Value = Proc PiProcess + | Term Term + | Chan Channel + | PrimitiveFunc TermFun + | Func {params :: [String] , body :: Value, closure :: Env} + +data PiError = NumArgs Name Integer [Value] + | TypeMismatch String [Value] + | Parser ParseError + | UnboundVar String String + | NotTerm Name Value + | NotFunction String String + | NotChannel String + | Default String + +type IOThrowsError = ExceptT PiError IO +type ThrowsError = Either PiError + +type Name = String +data Condition = Term `Equals` Term deriving (Eq) + +type Env = IORef (Map String Value) + +nullEnv :: IO Env +nullEnv = newIORef Map.empty + +isBound :: Env -> String -> IO Bool +isBound envRef var = liftM (isJust . Map.lookup var) $ readIORef envRef + +getVar :: Env -> String -> IOThrowsError Value +getVar envRef var = do env <- liftIO $ readIORef envRef + maybe (throwE $ UnboundVar "Getting an unbound variable" var) + return + (Map.lookup var env) + +setVar :: Env -> String -> Value -> IOThrowsError Value +setVar envRef var val = do env <- liftIO $ readIORef envRef + maybe (throwE $ UnboundVar "Setting an unbound variable" var) + (return $ liftIO $ writeIORef envRef $ Map.insert var val env) + (Map.lookup var env) + return val + +defineVar :: Env -> String -> Value -> IOThrowsError Value +defineVar envRef var val = do + alreadyDefined <- liftIO $ isBound envRef var + if alreadyDefined + then setVar envRef var val >> return val + else liftIO $ do + env <- readIORef envRef + writeIORef envRef $ Map.insert var val env + return val + +showValue :: Value -> String +showValue (Proc p) = show p +showValue (Term t) = show t +showValue (Chan c) = show $ convert c + where + convert ch = TFun "" (map TStr ex) $ length ex + where ex = extra ch +showValue (PrimitiveFunc _) = "" +showValue (Func {}) = "" + +eqvVal :: Value -> Value -> Bool +eqvVal (Proc p1) (Proc p2) = p1 == p2 +eqvVal (Term t1) (Term t2) = t1 == t2 +eqvVal _ _ = False + +instance Eq Value where (==) = eqvVal + +showPi :: PiProcess -> String +showPi Null = "0" +showPi (In c m) = "in(" ++ show c ++ "," ++ show m ++ ")" +showPi (Out c m) = "out(" ++ show c ++ "," ++ show m ++ ")" +showPi (Replicate proc) = "!(" ++ show proc ++ ")" +showPi (Conc procs) = intercalate "|" $ map show procs +showPi (p1 `Seq` Null) = show p1 +showPi (p1 `Seq` p2) = show p1 ++ ";" ++ show p2 +showPi (New n) = "new " ++ show n +showPi (If c p1 Null) = "if " ++ show c ++ " then " ++ show p1 +showPi (If c p1 p2) = "if " ++ show c ++ " then " ++ show p1 ++ " else " ++ show p2 +showPi (Let n t p) = "let " ++ show n ++ " = " ++ show t ++ case p of {Nothing -> "" ; Just x -> " in\n" ++ show x} + +showTerm :: Term -> String +showTerm (TVar x) = x +showTerm (TStr str) = "\"" ++ str ++ "\"" +showTerm (TNum num) = show num +showTerm (TBool b ) = map toLower $ show b +showTerm (TPair (a,b)) = "pair("++ show a ++ ","++ show b ++ ")" +showTerm (TFun n ts _ ) = n ++ "(" ++ intercalate "," (map show ts) ++ ")" + +showCond :: Condition -> String +showCond (t1 `Equals` t2) = show t1 ++ " == " ++ show t2 + +showError :: PiError -> String +showError (UnboundVar message var) = message ++ ": " ++ var +showError (NotFunction message fun) = message ++ ": " ++ fun +showError (NotChannel chan) = "Not a channel: " ++ chan +showError (NotTerm name var) = "Expecting " ++ name ++ " to be a Term, found: " ++ show var +showError (NumArgs name expected found) = "Expected " ++ show name ++ show expected ++ " args; found values " + ++ unwordsList found +showError (TypeMismatch expected found) = "Invalid type: expected " ++ expected ++ ", found " + ++ show found +showError (Parser parseErr) = "Parse error at " ++ show parseErr +showError (Default msg) = msg + +--instance Show PiProcess where show = showPi +instance Show Term where show = showTerm +instance Show Condition where show = showCond +instance Show Value where show = showValue +instance Show PiError where show = showError + +unwordsList :: [Value] -> String +unwordsList = unwords . map show + +parseNull :: Parser PiProcess +parseNull = do + paddedChar '0' + return Null + +parseIn :: Parser PiProcess +parseIn = do + _ <- string "in(" + name <- parseTerm + paddedComma + var <- parseTerm + _ <- char ')' + parseSeq $ In name var + +parseOut :: Parser PiProcess +parseOut = do + _ <- string "out(" + name <- parseTerm + paddedComma + term <- parseTerm + _ <- char ')' + parseSeq $ Out name term + +parseReplicate :: Parser PiProcess +parseReplicate = do + _ <- string "!(" + process <- parseProcess + _ <- char ')' + return $ Replicate process + +paddedChar :: Char -> Parser () +paddedChar ch = do + spaces + _ <- char ch + spaces + +paddedStr :: String -> Parser () +paddedStr str = do + spaces + _ <- string str + spaces + +parseSeq :: PiProcess -> Parser PiProcess +parseSeq p1 = do + p2 <- try (do {paddedChar ';' ; parseProcess}) <|> return Null + return $ p1 `Seq` p2 + +parseNew :: Parser PiProcess +parseNew = do + _ <- string "new" + spaces + name <- parseTerm + parseSeq $ New name + +parseIf :: Parser PiProcess +parseIf = do + _ <- string "if" + spaces + cond <- parseCondition + paddedStr "then" + p1 <- parseProcess + p2 <- try (do {paddedStr "else" ; parseProcess}) <|> return Null + return $ If cond p1 p2 + +parseLet :: Parser PiProcess +parseLet = do + _ <- string "let" + spaces + name <- parseTerm + paddedChar '=' + val <- liftM Term parseTerm <|> liftM Proc parseProcess + p <- try (do + paddedStr "in" + proc <- parseProcess + return $ Just proc) <|> return Nothing + return $ Let name val p + +parseCondition :: Parser Condition +parseCondition = do + t1 <- parseTerm + paddedChar '=' + t2 <- parseTerm + return $ t1 `Equals` t2 + +parseTVar :: Parser Term +parseTVar = do + v <- readVar + return $ case v of + "true" -> TBool True + "false" -> TBool False + _ -> TVar v + +parseTFun :: Parser Term +parseTFun = do + name <- readVar + spaces + args <- bracketed $ sepBy parseTerm paddedComma + return $ case (name,args) of + ("pair", t1:t2:_) -> TPair (t1,t2) + _ -> TFun name args (length args) + +parseTStr :: Parser Term +parseTStr = do + _ <- char '"' + x <- many $ noneOf "\"" + _ <- char '"' + return $ TStr x + +parseTNum :: Parser Term +parseTNum = liftM (TNum . read) (many1 digit) + +readVar :: Parser Name +readVar = do + frst <- letter <|> symbol + rest <- many $ letter <|> digit <|> symbol + return $ frst:rest + +symbol :: Parser Char +symbol = oneOf "'._<>" + +paddedComma :: Parser () +paddedComma = paddedChar ',' + +parseTerm :: Parser Term +parseTerm = try parseAnonChan + <|> try parseTFun + <|> parseTNum + <|> parseTVar + <|> parseTStr + where + parseAnonChan = do + paddedChar '(' + arg <- many digit + paddedChar ')' + case arg of + [] -> return $ TFun "anonChan" [] 0 + _ -> return $ TFun "anonChan" [TNum (read arg)] 1 + +parseProcess :: Parser PiProcess +parseProcess = liftM Conc $ sepBy parseProcess' (paddedChar '|') + where + parseProcess' = bracketed parseProcess'' <|> parseProcess'' + parseProcess'' = parseNull + <|> try parseIf + <|> parseIn + <|> parseOut + <|> parseReplicate + <|> parseNew + <|> parseLet + +bracketed :: Parser a -> Parser a +bracketed parser = do + _ <- char '(' + spaces + res <- parser + spaces + _ <- char ')' + return res + +type TermFun = [Term] -> ThrowsError Term + +bindVars :: Env -> [(String , Value)] -> IO Env +bindVars envRef bindings = do + env <- readIORef envRef + newIORef $ Map.union (Map.fromList bindings) env + +coreBindings :: IO Env +coreBindings = do + n <- nullEnv + e1 <- bindVars n (map (second PrimitiveFunc) primitives) + e2 <- bindVars e1 (map (second Chan) nativeChannels) + bindVars e2 [(counterRef, Term $ TNum lowestPort)] + where + lowestPort = 2^(15::Integer) + 2^(14::Integer) +counterRef :: String +counterRef = "###" + + +nativeChannels :: [(String , Channel)] +nativeChannels = [ ("stdin" , stdChan stdin) + , ("0" , stdChan stdin) + , ("stdout" , stdChan stdout) + , ("1" , stdChan stdout) + , ("stderr" , stdChan stderr) + , ("2" , stdChan stderr) + ] + +primitives :: [(String , TermFun)] +primitives = [ ("fst" , first) + , ("snd" , secnd) + , ("hash" , unaryId "hash") + , ("pk" , unaryId "pk") + , ("httpRequest", http) + , ("getmsg" , getmsg) + , ("pair" , binaryId "pair") + , ("sdec" , sdec) + , ("senc" , binaryId "senc") + , ("adec" , adec) + , ("aenc" , binaryId "aenc") + , ("sign" , binaryId "sign") + , ("checksign" , checksign) + , ("mac" , binaryId "mac") + ] + +true :: Term +true = TBool True + +false :: Term +false = TBool False + +constId :: String -> TermFun +constId name [] = return $ TFun name [] 0 +constId name e = throwError $ NumArgs name 0 (map Term e) + +unaryId :: String -> TermFun +unaryId name [x] = return $ TFun name [x] 1 +unaryId name e = throwError $ NumArgs name 1 (map Term e) + +binaryId :: String -> TermFun +binaryId name [x,y] = return $ TFun name [x,y] 2 +binaryId name e = throwError $ NumArgs name 2 (map Term e) + +getmsg :: TermFun +getmsg [TFun "sign" [_,y] 2] = return y +getmsg e = throwError $ TypeMismatch "sign" $ map Term e + +first :: TermFun +first [TPair p] = return $ fst p +first e = throwError $ TypeMismatch "pair" $ map Term e + +secnd :: TermFun +secnd [TPair p] = return $ snd p +secnd e = throwError $ TypeMismatch "pair" $ map Term e + +sdec :: TermFun +sdec [k1, TFun "senc" [k2,y] 2] + |k1 == k2 = return y + |otherwise = throwError $ Default "keys not the same in sdec" +sdec e = throwError $ TypeMismatch "(var,senc(var,var))" $ map Term e + +adec :: TermFun +adec [x , TFun "aenc" [TFun "pk" [k] 1, y ] 2] + | x == k = return y + | otherwise= throwError $ Default "keys not same in adec" +adec e = throwError $ TypeMismatch "(var,aenc(pk(var),var))" $ map Term e + +checksign :: TermFun +checksign [TFun "pk" [k1] 1 , TFun "sign" [k2,_] 2 ] = return $ TBool (k1 == k2) +checksign e = throwError $ TypeMismatch "(pk(var),sign(var,var))" $ map Term e + +http :: TermFun +http [TStr url] = case httpGetRequest http' of + Just x -> return $ TStr x + Nothing -> throwError $ Default "malformed uri" + where + http' = if take 7 url /= http'' then http'' ++ url else url + http'' = "http://" +http _ = throwError $ Default "undefined" + +main :: IO () +main = do + name <- getProgName + args <- getArgs + case args of + [] -> runRepl coreBindings + [x] -> readFile x >>= runProcess coreBindings + _ -> do + putStrLn "Use:" + putStrLn $ name ++ " -- Enter the REPL" + putStrLn $ name ++ " [process] -- Run single process" + +readProgram :: String -> ThrowsError PiProcess +readProgram input = case parse parseProcess "pi-calculus" input of + Left err -> throwError $ Parser err + Right val -> return val + +evalCond :: Env -> Condition -> IOThrowsError Bool +evalCond env (t1 `Equals` t2) = liftM2 (==) (evalTerm env t1) (evalTerm env t2) + +evalTerm :: Env -> Term -> IOThrowsError Value +evalTerm env (TVar name) = getVar env name +evalTerm _ (TNum num) = return $ Term $ TNum num +evalTerm _ (TStr str) = return $ Term $ TStr str +evalTerm _ (TBool b ) = return $ Term $ TBool b +evalTerm env (TPair (t1,t2)) = do + a <- evalTerm env t1 + b <- evalTerm env t2 + case (a,b) of + (Term c, Term d) -> return $ Term $ TPair (c,d) + _ -> throwE $ Default "pair not given two terms" +evalTerm env (TFun "anonChan" [] 0) = do + port <- assignFreePort env + liftM Chan $ liftIO $ newChan Internal ("localhost:"++ show port) port +evalTerm _ (TFun "anonChan" [TNum n] 1) = liftM Chan $ liftIO $ newChan Internal ("localhost:"++ show n) n +evalTerm env (TFun "httpChan" [TStr addr] 1) = do + port <- assignFreePort env + liftM Chan $ liftIO $ newChan HTTP (addr ++ ":80") port +evalTerm env (TFun "chan" [TStr addr,TNum p] 2) = do + port <- assignFreePort env + liftM Chan $ liftIO $ newChan String (addr ++ ":" ++ show p) port +evalTerm env (TFun name args _) = do + fun <- getVar env name + argVals <- mapM (evalTerm env) args + apply fun argVals + + +assignFreePort :: Env -> IOThrowsError Integer +assignFreePort env = do + Term (TNum port) <- getVar env counterRef + _ <- setVar env counterRef $ Term $ TNum $ port + 1 + if port == 2 ^ (16 :: Integer) + then error "HOW MANY CHANNELS DO YOU WANT?!" + else return port + + +apply :: Value -> [Value] -> IOThrowsError Value +apply (PrimitiveFunc fun) args = do + ts <- extracTerms args + res <- liftThrows $ fun ts + return $ Term res +apply (Func parms bdy closre) args = + if num parms /= num args + then throwE $ NumArgs "user-defined" (num parms) args + else do + clos <- liftIO (bindVars closre $ zip parms args) + case bdy of + Term t -> evalTerm clos t + Proc p -> eval clos p >> return bdy + _ -> throwE $ Default "this function makes no sense" + where + num = toInteger . length +apply e _ = throwE $ NotFunction "expecting a function found" $ show e + +extracTerms :: [Value] -> IOThrowsError [Term] +extracTerms ts + | all isTerm ts = return $ map (\(Term t) -> t) ts + | otherwise = throwE $ Default "not all terms" + +isTerm :: Value -> Bool +isTerm (Term _) = True +isTerm _ = False + +liftThrows :: ThrowsError a -> IOThrowsError a +liftThrows = either throwE return + +extractValue :: ThrowsError a -> a +extractValue (Right v) = v +extractValue (Left e) = error $ show e + +eval :: Env -> PiProcess -> IOThrowsError () +eval _ Null = return () +eval env (In a (TVar name)) = do + chan <- evalChan env a + received <- receiveIn chan + _ <- defineVar env name received + return () +eval env (Out a b) = do + chan <- evalChan env a + bVal <- evalTerm env b + sendOut chan bVal + return () +eval env (Replicate proc) = liftIO (threadDelay 1000000) >> eval env (Conc [proc, Replicate proc]) +eval env (Conc []) = eval env Null +eval env (Conc [proc]) = eval env proc +eval env (Conc procs) = do + var <- liftIO newEmptyMVar + mapM_ (forkProcess var) procs + res <- liftIO $ takeMVar var + case res of + Left err -> throwE err + Right _ -> return () + where + forkProcess var proc = liftIO $ forkIO $ do + res <- runExceptT $ eval env proc + _ <- tryPutMVar var res + return () +eval env (p1 `Seq` p2) = do + eval env p1 + eval env p2 +eval env (New var@(TVar name)) = do + _ <- defineVar env name $ Term var + return () +eval env (If b p1 p2) = do + cond <- evalCond env b + eval env (if cond then p1 else p2) +eval env (Let (TVar name) (Term t2) (Just p)) = do + val <- evalTerm env t2 + newEnv <- liftIO $ bindVars env [(name,val)] + eval newEnv p +eval env (Let (TVar name) (Term t2) Nothing) = do + val <- evalTerm env t2 + _ <- defineVar env name val + return () +eval env (Let (TFun name args _) t2 (Just p)) = + defineLocalFun env name args t2 p +eval env (Let (TFun name args _) t2 Nothing) = + defineGlobalFun env name args t2 +eval _ _ = throwE $ Default "undefined action" + +defineGlobalFun :: Env -> String -> [Term] -> Value -> IOThrowsError () +defineGlobalFun env name args term = do + _ <- defineVar env name $ makeFun args term env + return () +defineLocalFun :: Env -> String -> [Term] -> Value -> PiProcess -> IOThrowsError () +defineLocalFun env name args term p = do + clos <- liftIO $ bindVars env [(name, makeFun args term env)] + eval clos p + +makeFun :: [Term] -> Value -> Env -> Value +makeFun args = Func (map show args) + +evalString :: Env -> String -> IO String +evalString env expr = runIOThrows $ liftM show $ liftThrows (readProgram expr) >>= eval env + +runIOThrows :: IOThrowsError String -> IO String +runIOThrows action = liftM extractValue $ runExceptT (trapError action) + +trapError :: IOThrowsError String -> IOThrowsError String +trapError action = catchE action (return . show) + +readTerm :: String -> ThrowsError Term +readTerm str = case parse parseTerm "Term" str of + Left err -> throwError $ Parser err + Right val -> return val + +evalAndPrint :: Env -> String -> IO () +evalAndPrint env expr = do + res <- evalString env expr + case res of + "()" -> return () + _ -> putStrLn res + +runProcess :: IO Env -> String -> IO () +runProcess core expr = core >>= flip evalAndPrint expr + +runRepl :: IO Env -> IO () +runRepl core = core >>= until_ quit (readPrompt "phi>") . evalAndPrint + where + quit = flip any [":quit",":q"] . (==) + +until_ :: Monad m => (a -> Bool) -> m a -> (a -> m ()) -> m () +until_ pre prompt action = do + result <- prompt + unless (pre result) $ action result >> until_ pre prompt action + +readPrompt :: String -> IO String +readPrompt prompt = flushStr prompt >> getLine + +flushStr :: String -> IO () +flushStr str = putStr str >> hFlush stdout + +sendOut :: Channel -> Value -> IOThrowsError () +sendOut chan val = liftIO $ send chan $ show val + +receiveIn :: Channel -> IOThrowsError Value +receiveIn chan = do + msg <- liftIO $ receive chan + let term = extractValue $ readTerm msg + case term of + TFun "" ex _ -> decodeChannel ex + _ -> return $ Term term + where + decodeChannel e = do + let extraStrings = map (\(TStr x) -> x) e + let extraData = map (second tail . break (==dataBreak)) extraStrings + case getChannelData extraData of + Just (t,h,p) -> liftM Chan $ liftIO $ newChan t h p + Nothing -> throwE $ Default "incomplete data in channel" + + +getChannelData :: [(String,String)] -> Maybe (ChannelType, String, Integer) +getChannelData ex = do + t <- lookup "type" ex + host <- lookup "host" ex + cp <- lookup "clientPort" ex + return (read t,host,read cp) + +evalChan :: Env -> Term -> IOThrowsError Channel +evalChan env t = do + chan <- evalTerm env t + case chan of + Chan c -> return c + _ -> throwE $ NotChannel $ show t + + +httpGetRequest :: String -> Maybe String +httpGetRequest str = do + uri <- parseURI str + return $ show (mkRequest GET uri :: Request String) + diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/pi-calculus.cabal b/pi-calculus.cabal new file mode 100644 --- /dev/null +++ b/pi-calculus.cabal @@ -0,0 +1,20 @@ +-- Initial pi-calculus.cabal generated by cabal init. For further +-- documentation, see http://haskell.org/cabal/users-guide/ + +name: pi-calculus +version: 0.0.1 +synopsis: Applied pi-calculus compiler +description: Phi - A compiler for the applied pi-calculus. Very rough around the edges. +license: GPL-3 +license-file: LICENSE +author: Will de Renzy-Martin +maintainer: will.derenzymartin@gmail.com +-- copyright: +category: Web +build-type: Simple +cabal-version: >=1.8 + +executable phi + main-is: PiCalculus.hs + other-modules: Channel + build-depends: base >=4.5 && <=4.7, mtl ==2.2.*, parsec ==3.1.*, containers ==0.5.*, transformers ==0.4.*, network ==2.5.*, HTTP >=2.15