Staging
v0.5.1
v0.5.1
swh:1:snp:635f4099902912592851108bcac178ff574f7c5f
Tip revision: 1da43e5e916949c8e849e656d9d05fa4b9d6836c authored by Benjamin Peterson on 26 June 2009, 13:21:52 UTC
rearrange the sections of the README, so they'll hopefully be more in the order people will interested in
rearrange the sections of the README, so they'll hopefully be more in the order people will interested in
Tip revision: 1da43e5
microprotocols.c
/* 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 **/
PyObject *psyco_adapters;
/* 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)
{
PyObject *adapter, *key;
/* 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_GetItem(psyco_adapters, key);
Py_DECREF(key);
if (adapter) {
PyObject *adapted = PyObject_CallFunctionObjArgs(adapter, obj, NULL);
return adapted;
}
/* try to have the protocol adapt this object*/
if (PyObject_HasAttrString(proto, "__adapt__")) {
PyObject *adapted = PyObject_CallMethod(proto, "__adapt__", "O", obj);
if (adapted) {
if (adapted != Py_None) {
return adapted;
} else {
Py_DECREF(adapted);
}
}
if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError))
return NULL;
}
/* and finally try to have the object adapt itself */
if (PyObject_HasAttrString(obj, "__conform__")) {
PyObject *adapted = PyObject_CallMethod(obj, "__conform__","O", proto);
if (adapted) {
if (adapted != Py_None) {
return adapted;
} else {
Py_DECREF(adapted);
}
}
if (PyErr_Occurred() && !PyErr_ExceptionMatches(PyExc_TypeError)) {
return NULL;
}
}
/* 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);
}