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|
{-# OPTIONS -fallow-overlapping-instances #-}
{- arch-tag: Python interpreter module
Copyright (C) 2005 John Goerzen <jgoerzen@complete.org>
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Python.Interpreter
Copyright : Copyright (C) 2005 John Goerzen
License : GNU GPL, version 2 or above
Maintainer : John Goerzen,
Maintainer : jgoerzen\@complete.org
Stability : provisional
Portability: portable
Interface to Python interpreter
Written by John Goerzen, jgoerzen\@complete.org
-}
module Python.Interpreter (
py_initialize,
-- * Intrepreting Code
pyRun_SimpleString,
pyRun_String,
pyRun_StringHs,
StartFrom(..),
-- * Calling Code
callByName,
callByNameHs,
noParms,
noKwParms,
-- * Imports
pyImport,
pyImport_ImportModule,
pyImport_AddModule,
pyModule_GetDict,
)
where
import Python.Utils
import Python.Objects
import Python.Types
import Python.ForeignImports
import Foreign
import Foreign.C.String
import Foreign.C
import System.IO.Unsafe
{- | Initialize the Python interpreter environment.
MUST BE DONE BEFORE DOING ANYTHING ELSE! -}
py_initialize :: IO ()
py_initialize = do cpy_initialize
pyImport "traceback"
pyRun_SimpleString :: String -> IO ()
pyRun_SimpleString x = withCString x (\cs ->
do cpyRun_SimpleString cs >>= checkCInt
return ()
)
-- | Like 'pyRun_String', but take more Haskellish args and results.
pyRun_StringHs :: (ToPyObject b, FromPyObject c) =>
String -- ^ Command to run
-> StartFrom -- ^ Start token
-- -> [(String, a)] -- ^ Globals (may be empty)
-> [(String, b)] -- ^ Locals (may be empty)
-> IO c
pyRun_StringHs cmd start locals =
let conv (k, v) = do v1 <- toPyObject v
return (k, v1)
in do
--rglobals <- mapM conv globals
rlocals <- mapM conv locals
pyRun_String cmd start rlocals >>= fromPyObject
-- | Run some code in Python.
pyRun_String :: String -- ^ Command to run
-> StartFrom -- ^ Start Token
-- -> [(String, PyObject)] -- ^ Globals (may be empty)
-> [(String, PyObject)] -- ^ Locals (may be empty)
-> IO PyObject -- ^ Result
pyRun_String command startfrom xlocals =
let cstart = sf2c startfrom
in do dobj <- getDefaultGlobals
rlocals <- toPyObject xlocals
withCString command (\ccommand ->
withPyObject dobj (\cglobals ->
withPyObject rlocals (\clocals ->
cpyRun_String ccommand cstart cglobals clocals >>= fromCPyObject
)))
{- | Call a function or callable object by name. -}
callByName :: String -- ^ Object\/function name
-> [PyObject] -- ^ List of non-keyword parameters
-> [(String, PyObject)] -- ^ List of keyword parameters
-> IO PyObject
callByName fname sparms kwparms =
do func <- pyRun_String fname Py_eval_input []
pyObject_Call func sparms kwparms
{- | Call a function or callable object by namem using Haskell args
and return values..
You can use 'noParms' and 'noKwParms' if you have no simple or
keyword parameters to pass, respectively. -}
callByNameHs :: (ToPyObject a, ToPyObject b, FromPyObject c) =>
String -- ^ Object\/function name
-> [a] -- ^ List of non-keyword parameters
-> [(String, b)] -- ^ List of keyword parameters
-> IO c
callByNameHs fname sparms kwparms =
do func <- pyRun_String fname Py_eval_input []
pyObject_CallHs func sparms kwparms
{- | Import a module into the current environment in the normal sense
(similar to \"import\" in Python).
-}
pyImport :: String -> IO ()
pyImport x =
do pyImport_ImportModule x
globals <- getDefaultGlobals
cdict <- pyImport_GetModuleDict
py_incref cdict
pyo2 <- fromCPyObject cdict
dict <- fromPyObject pyo2
case lookup x dict of
Nothing -> return ()
Just pyo -> do withPyObject globals (\cglobals ->
withPyObject pyo (\cmodule ->
withCString x (\cstr ->
pyDict_SetItemString cglobals cstr cmodule >>= checkCInt)))
return ()
{- | Wrapper around C PyImport_ImportModule, which imports a module.
You may want the higher-level 'pyImport' instead. -}
pyImport_ImportModule :: String -> IO PyObject
pyImport_ImportModule x =
do globals <- getDefaultGlobals
fromlist <- toPyObject ['*']
cr <- withPyObject globals (\cglobals ->
withPyObject fromlist (\cfromlist ->
withCString x (\cstr ->
cpyImport_ImportModuleEx cstr cglobals cglobals cfromlist)))
fromCPyObject cr
|
