pi-calculus (empty) → 0.0.1
raw patch · 5 files changed
+1462/−0 lines, 5 filesdep +HTTPdep +basedep +containerssetup-changed
Dependencies added: HTTP, base, containers, mtl, network, parsec, transformers
Files
- Channel.hs +117/−0
- LICENSE +675/−0
- PiCalculus.hs +648/−0
- Setup.hs +2/−0
- pi-calculus.cabal +20/−0
+ Channel.hs view
@@ -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
+ LICENSE view
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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.++ <one line to give the program's name and a brief idea of what it does.>+ Copyright (C) <year> <name of author>++ 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 <http://www.gnu.org/licenses/>.++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:++ <program> Copyright (C) <year> <name of author>+ 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+<http://www.gnu.org/licenses/>.++ 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+<http://www.gnu.org/philosophy/why-not-lgpl.html>.+
+ PiCalculus.hs view
@@ -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 "<chan>" (map TStr ex) $ length ex+ where ex = extra ch+showValue (PrimitiveFunc _) = "<primitive>" +showValue (Func {}) = "<user function>" ++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 "<chan>" 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)+
+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ pi-calculus.cabal view
@@ -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