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|
{-# OPTIONS -fallow-overlapping-instances #-}
{- arch-tag: Python dict-like objects
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.Objects.Dict
Copyright : Copyright (C) 2005 John Goerzen
License : GNU GPL, version 2 or above
Maintainer : John Goerzen,
Maintainer : jgoerzen\@complete.org
Stability : provisional
Portability: portable
Python dict-like objects
Written by John Goerzen, jgoerzen\@complete.org
This module can be used to access Python dicts and dict-like objects such as
dbm databases. For a higher-level interface to creating and working with these
dbm interfaces, please see the functions in "MissingPy.AnyDBM". Also,
for functions that use this, please see "Database.AnyDBM".
-}
module Python.Objects.Dict (PyDict,
mkPyDict,
fromPyDict)
where
import Python.ForeignImports
import Python.Objects
import Python.Utils
import Foreign
import Foreign.C.Types
import Python.Exceptions
import Database.AnyDBM
import Python.Types
{- | The basic type for a Python dict or dict-like object. -}
newtype PyDict = PyDict
PyObject -- Main dict object
{- | Takes a 'PyObject' representing a Python dict or dict-like objext
and makes it into a 'PyDict'. -}
mkPyDict :: PyObject -> PyDict
mkPyDict o = PyDict o
{- | Takes a 'PyDict' and returns its internal 'PyObject'. -}
fromPyDict :: PyDict -> PyObject
fromPyDict (PyDict o) = o
{- | Wrap an operation, raising exceptions in the IO monad as appropriate. -}
pydwrap :: PyDict -> (PyObject -> IO a) -> IO a
pydwrap (PyDict pyobj) func = catchPy (func pyobj) exc2ioerror
{- | Give it a CPyObject instead. -}
cpydwrap :: PyDict -> (Ptr CPyObject -> IO a) -> IO a
cpydwrap x func = pydwrap x (\y -> withPyObject y func)
instance AnyDBM PyDict where
insertA h k v =
do ko <- toPyObject k
kv <- toPyObject v
withPyObject ko (\ck ->
withPyObject kv (\cv ->
cpydwrap h (\cdict ->
pyObject_SetItem cdict ck cv >>= checkCInt >> return()
)
)
)
deleteA h k =
do ko <- toPyObject k
withPyObject ko (\ck ->
cpydwrap h (\cdict ->
pyObject_DelItem cdict ck >>= checkCInt >> return ()))
lookupA h k =
do ko <- toPyObject k
withPyObject ko (\ck ->
cpydwrap h (\cdict ->
do r <- pyObject_GetItem cdict ck
if r == nullPtr
then do pyErr_Clear -- Ignore this exception
return Nothing
else do retval <- fromCPyObject r >>= fromPyObject
return $ Just retval
))
{-
toListA h =
This used to be:
pydwrap h fromPyObject
but some *dbm's are incompatible with that. Sigh. -}
keysA h =
cpydwrap h (\ch ->
do keysobj <- pyMapping_Keys ch >>= fromCPyObject
keys <- (fromPyObject keysobj)::IO [String]
return keys
)
flushA h = pydwrap h (\pyo -> do h <- hasattr pyo "sync"
if h
then runMethodHs pyo "sync" noParms noKwParms
else return ()
)
closeA h = pydwrap h (\pyo -> do h <- hasattr pyo "close"
if h
then runMethodHs pyo "close" noParms noKwParms
else return ()
)
|
