mv code back into src/. Kindly pointed out by Lemmih
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Don Stewart
262
src/System/Eval/Haskell.hs
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262
src/System/Eval/Haskell.hs
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--
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-- Copyright (C) 2004-5 Don Stewart - http://www.cse.unsw.edu.au/~dons
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--
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-- This library is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU Lesser General Public
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-- License as published by the Free Software Foundation; either
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-- version 2.1 of the License, or (at your option) any later version.
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--
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-- This library is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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-- Lesser General Public License for more details.
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--
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-- You should have received a copy of the GNU Lesser General Public
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-- License along with this library; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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-- USA
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--
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--
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-- compile and run haskell strings at runtime.
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--
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module System.Eval.Haskell (
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eval,
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eval_,
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unsafeEval,
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unsafeEval_,
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typeOf,
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mkHsValues,
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{-
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hs_eval_b, -- return a Bool
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hs_eval_c, -- return a CChar
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hs_eval_i, -- return a CInt
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hs_eval_s, -- return a CString
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-}
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module System.Eval.Utils,
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) where
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import System.Eval.Utils
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import System.Plugins.Make
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import System.Plugins.Load
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import AltData.Dynamic ( Dynamic )
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import AltData.Typeable ( Typeable )
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import Data.Either
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import Data.Map as Map
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import System.IO
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import System.Directory
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-- import Foreign.C
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-- import Foreign
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--
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-- ok. the idea is: the have either installed the library, in which case
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-- is is registered, and the path to altdata is known to ghc, so just
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-- saying "-package altdata" will work. if not, we search in the build
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-- dir just in case. this should work for inplace work.
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--
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-- TODO could have a few extra package.conf search paths in here,
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-- including PREFIX.
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--
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-- ---------------------------------------------------------------------
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-- return a compiled value, and type check it first
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--
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-- TODO make this faster.
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--
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eval :: Typeable a => String -> [Import] -> IO (Maybe a)
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eval src mods = do
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pwd <- getCurrentDirectory
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(cmdline,loadpath) <- getPaths
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tmpf <- mkUniqueWith dynwrap src mods
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status <- make tmpf cmdline
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m_rsrc <- case status of
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MakeSuccess _ obj -> do
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m_v <- dynload obj [pwd] loadpath symbol
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case m_v of LoadFailure _ -> return Nothing
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LoadSuccess _ rsrc -> return $ Just rsrc
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MakeFailure err -> mapM_ putStrLn err >> return Nothing
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makeCleaner tmpf
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return m_rsrc
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-- ---------------------------------------------------------------------
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-- Version of eval with all the buttons available.
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eval_ :: Typeable a =>
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String -- ^ code to compile
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-> [Import] -- ^ any imports
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-> [String] -- ^ extra make flags
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-> [FilePath] -- ^ (package.confs) for load
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-> [FilePath] -- ^ include paths load is to search in
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-> IO (Either [String] (Maybe a)) -- ^ either errors, or maybe a well typed value
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eval_ src mods args ldflags incs = do
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pwd <- getCurrentDirectory
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(cmdline,loadpath) <- getPaths -- find path to altdata
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tmpf <- mkUniqueWith dynwrap src mods
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status <- make tmpf $ ["-Onot"] ++ cmdline ++ args
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m_rsrc <- case status of
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MakeSuccess _ obj -> do
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m_v <- dynload obj (pwd:incs) (loadpath++ldflags) symbol
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return $ case m_v of LoadFailure e -> Left e
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LoadSuccess _ rsrc -> Right (Just rsrc)
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MakeFailure err -> return $ Left err
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makeCleaner tmpf
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return m_rsrc
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-- ---------------------------------------------------------------------
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-- unsafe because it doesn't use Dynamic types
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-- useful for not having to provide type constraints to values, or when
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-- you want to easily deal with polymorphic values.
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--
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unsafeEval :: String -> [Import] -> IO (Maybe a)
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unsafeEval src mods = do
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pwd <- getCurrentDirectory
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tmpf <- mkUniqueWith wrap src mods
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status <- make tmpf []
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m_rsrc <- case status of
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MakeSuccess _ obj -> do
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m_v <- load obj [pwd] [] symbol
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case m_v of LoadFailure _ -> return Nothing
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LoadSuccess _ rsrc -> return $ Just rsrc
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MakeFailure err -> mapM_ putStrLn err >> return Nothing
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makeCleaner tmpf
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return m_rsrc
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--
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-- like unsafeEval, except you can supply extra args to make and load,
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-- and the error messages are returned too.
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--
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-- Need to be able to specify a search path to look in.
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--
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unsafeEval_ :: String -- ^ code to compile
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-> [Import] -- ^ any imports
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-> [String] -- ^ make flags
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-> [FilePath] -- ^ (package.confs) for load
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-> [FilePath] -- ^ include paths load is to search in
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-> IO (Either [String] a)
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unsafeEval_ src mods args ldflags incs = do
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pwd <- getCurrentDirectory
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tmpf <- mkUniqueWith wrap src mods
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status <- make tmpf args
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e_rsrc <- case status of
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MakeSuccess _ obj -> do
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m_v <- load obj (pwd:incs) ldflags symbol
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case m_v of LoadFailure e -> return $ Left e
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LoadSuccess _ rsrc -> return $ Right rsrc
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MakeFailure err -> return $ Left err
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makeCleaner tmpf
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return e_rsrc
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------------------------------------------------------------------------
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--
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-- Convenience function for use with eval (and friends). Returns a
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-- string of Haskell code with the Data.Map passed as values.
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--
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mkHsValues :: (Show a) => Map.Map String a -> String
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mkHsValues values = concat $ elems $ Map.mapWithKey convertToHs values
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where convertToHs :: (Show a) => String -> a -> String
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convertToHs name value = name ++ " = " ++ show value ++ "\n"
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------------------------------------------------------------------------
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--
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-- return a compiled value's type, by using Dynamic to get a
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-- representation of the inferred type.
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--
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typeOf :: String -> [Import] -> IO String
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typeOf src mods = do
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pwd <- getCurrentDirectory
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(cmdline,loadpath) <- getPaths
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tmpf <- mkUniqueWith dynwrap src mods
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status <- make tmpf cmdline
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ty <- case status of
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MakeSuccess _ obj -> do
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m_v <- load obj [pwd] loadpath symbol :: IO (LoadStatus Dynamic)
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case m_v of
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LoadFailure _ -> return "<failure>"
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LoadSuccess _ v -> return $ (init . tail) $ show v
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MakeFailure err -> mapM_ putStrLn err >> return []
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makeCleaner tmpf
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return ty
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--
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-- note that the wrapper uses our altdata library for dynamic typing.
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-- hence it needs to see the path to the altdata package. grr. is it
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-- installed or not? what path does it have?
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--
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dynwrap :: String -> String -> [Import] -> String
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dynwrap expr nm mods =
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"module "++nm++ "( resource ) where\n" ++
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concatMap (\m-> "import "++m++"\n") mods ++
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"import AltData.Dynamic\n" ++
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"resource = let { v = \n" ++
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"{-# LINE 1 \"<eval>\" #-}\n" ++ expr ++ ";} in toDyn v"
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-- ---------------------------------------------------------------------
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-- unsafe wrapper
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--
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wrap :: String -> String -> [Import] -> String
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wrap expr nm mods =
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"module "++nm++ "( resource ) where\n" ++
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concatMap (\m-> "import "++m++"\n") mods ++
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"resource = let { v = \n" ++
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"{-# LINE 1 \"<Plugins.Eval>\" #-}\n" ++ expr ++ ";} in v"
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{-
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------------------------------------------------------------------------
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--
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-- And for our friends in foreign parts
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--
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-- TODO needs to accept char** to import list
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--
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--
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-- return NULL pointer if an error occured.
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--
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foreign export ccall hs_eval_b :: CString -> IO (Ptr CInt)
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foreign export ccall hs_eval_c :: CString -> IO (Ptr CChar)
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foreign export ccall hs_eval_i :: CString -> IO (Ptr CInt)
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foreign export ccall hs_eval_s :: CString -> IO CString
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------------------------------------------------------------------------
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--
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-- TODO implement a marshalling for Dynamics, so that we can pass that
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-- over to the C side for checking.
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--
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hs_eval_b :: CString -> IO (Ptr CInt)
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hs_eval_b s = do m_v <- eval_cstring s
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case m_v of Nothing -> return nullPtr
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Just v -> new (fromBool v)
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hs_eval_c :: CString -> IO (Ptr CChar)
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hs_eval_c s = do m_v <- eval_cstring s
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case m_v of Nothing -> return nullPtr
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Just v -> new (castCharToCChar v)
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-- should be Integral
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hs_eval_i :: CString -> IO (Ptr CInt)
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hs_eval_i s = do m_v <- eval_cstring s :: IO (Maybe Int)
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case m_v of Nothing -> return nullPtr
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Just v -> new (fromIntegral v :: CInt)
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hs_eval_s :: CString -> IO CString
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hs_eval_s s = do m_v <- eval_cstring s
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case m_v of Nothing -> return nullPtr
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Just v -> newCString v
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--
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-- convenience
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--
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eval_cstring :: Typeable a => CString -> IO (Maybe a)
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eval_cstring cs = do s <- peekCString cs
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eval s [] -- TODO use eval()
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-}
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