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cpython/Modules/_sqlite/microprotocols.c at 3.8 · python-emscripten/cpython · GitHub
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Modules
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_sqlite
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microprotocols.c
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cpython
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Modules
/
_sqlite
/
microprotocols.c
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/* microprotocols.c - minimalist and non-validating protocols implementation
*
* Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
*
* This file is part of psycopg and was adapted for pysqlite. Federico Di
* Gregorio gave the permission to use it within pysqlite under the following
* license:
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include
<Python.h>
#include
<structmember.h>
#include
"cursor.h"
#include
"microprotocols.h"
#include
"prepare_protocol.h"
/** the adapters registry **/
static
PyObject
*
psyco_adapters
=
NULL
;
/* pysqlite_microprotocols_init - initialize the adapters dictionary */
int
pysqlite_microprotocols_init
(
PyObject
*
dict
)
{
/* create adapters dictionary and put it in module namespace */
if
((
psyco_adapters
=
PyDict_New
())
==
NULL
) {
return
-1
;
}
return
PyDict_SetItemString
(
dict
,
"adapters"
,
psyco_adapters
);
}
/* pysqlite_microprotocols_add - add a reverse type-caster to the dictionary */
int
pysqlite_microprotocols_add
(
PyTypeObject
*
type
,
PyObject
*
proto
,
PyObject
*
cast
)
{
PyObject
*
key
;
int
rc
;
if
(
proto
==
NULL
)
proto
=
(
PyObject
*
)
&
pysqlite_PrepareProtocolType
;
key
=
Py_BuildValue
(
"(OO)"
, (
PyObject
*
)
type
,
proto
);
if
(!
key
) {
return
-1
;
}
rc
=
PyDict_SetItem
(
psyco_adapters
,
key
,
cast
);
Py_DECREF
(
key
);
return
rc
;
}
/* pysqlite_microprotocols_adapt - adapt an object to the built-in protocol */
PyObject
*
pysqlite_microprotocols_adapt
(
PyObject
*
obj
,
PyObject
*
proto
,
PyObject
*
alt
)
{
_Py_IDENTIFIER
(
__adapt__
);
_Py_IDENTIFIER
(
__conform__
);
PyObject
*
adapter
,
*
key
,
*
adapted
;
/* we don't check for exact type conformance as specified in PEP 246
because the pysqlite_PrepareProtocolType type is abstract and there is no
way to get a quotable object to be its instance */
/* look for an adapter in the registry */
key
=
Py_BuildValue
(
"(OO)"
, (
PyObject
*
)
obj
->
ob_type
,
proto
);
if
(!
key
) {
return
NULL
;
}
adapter
=
PyDict_GetItemWithError
(
psyco_adapters
,
key
);
Py_DECREF
(
key
);
if
(
adapter
) {
Py_INCREF
(
adapter
);
adapted
=
PyObject_CallFunctionObjArgs
(
adapter
,
obj
,
NULL
);
Py_DECREF
(
adapter
);
return
adapted
;
}
if
(
PyErr_Occurred
()) {
return
NULL
;
}
/* try to have the protocol adapt this object */
if
(
_PyObject_LookupAttrId
(
proto
,
&
PyId___adapt__
,
&
adapter
)
<
0
) {
return
NULL
;
}
if
(
adapter
) {
adapted
=
PyObject_CallFunctionObjArgs
(
adapter
,
obj
,
NULL
);
Py_DECREF
(
adapter
);
if
(
adapted
==
Py_None
) {
Py_DECREF
(
adapted
);
}
else
if
(
adapted
||
!
PyErr_ExceptionMatches
(
PyExc_TypeError
)) {
return
adapted
;
}
else
{
PyErr_Clear
();
}
}
/* and finally try to have the object adapt itself */
if
(
_PyObject_LookupAttrId
(
obj
,
&
PyId___conform__
,
&
adapter
)
<
0
) {
return
NULL
;
}
if
(
adapter
) {
adapted
=
PyObject_CallFunctionObjArgs
(
adapter
,
proto
,
NULL
);
Py_DECREF
(
adapter
);
if
(
adapted
==
Py_None
) {
Py_DECREF
(
adapted
);
}
else
if
(
adapted
||
!
PyErr_ExceptionMatches
(
PyExc_TypeError
)) {
return
adapted
;
}
else
{
PyErr_Clear
();
}
}
if
(
alt
) {
Py_INCREF
(
alt
);
return
alt
;
}
/* else set the right exception and return NULL */
PyErr_SetString
(
pysqlite_ProgrammingError
,
"can't adapt"
);
return
NULL
;
}
/** module-level functions **/
PyObject
*
pysqlite_adapt
(
pysqlite_Cursor
*
self
,
PyObject
*
args
)
{
PyObject
*
obj
,
*
alt
=
NULL
;
PyObject
*
proto
=
(
PyObject
*
)
&
pysqlite_PrepareProtocolType
;
if
(!
PyArg_ParseTuple
(
args
,
"O|OO"
,
&
obj
,
&
proto
,
&
alt
))
return
NULL
;
return
pysqlite_microprotocols_adapt
(
obj
,
proto
,
alt
);
}
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