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/*
utils.c
Copyright (C) 2012-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
This module is part of SQLAlchemy and is released under
the MIT License: http://www.opensource.org/licenses/mit-license.php
*/
#include <Python.h>
/*
Given arguments from the calling form *multiparams, **params,
return a list of bind parameter structures, usually a list of
dictionaries.
In the case of 'raw' execution which accepts positional parameters,
it may be a list of tuples or lists.
*/
static PyObject *
distill_params(PyObject *self, PyObject *args)
{
PyObject *multiparams, *params;
PyObject *enclosing_list, *double_enclosing_list;
PyObject *zero_element, *zero_element_item;
Py_ssize_t multiparam_size, zero_element_length;
if (!PyArg_UnpackTuple(args, "_distill_params", 2, 2, &multiparams, ¶ms)) {
return NULL;
}
if (multiparams != Py_None) {
multiparam_size = PyTuple_Size(multiparams);
if (multiparam_size < 0) {
return NULL;
}
}
else {
multiparam_size = 0;
}
if (multiparam_size == 0) {
if (params != Py_None && PyDict_Size(params) != 0) {
enclosing_list = PyList_New(1);
if (enclosing_list == NULL) {
return NULL;
}
Py_INCREF(params);
if (PyList_SetItem(enclosing_list, 0, params) == -1) {
Py_DECREF(params);
Py_DECREF(enclosing_list);
return NULL;
}
}
else {
enclosing_list = PyList_New(0);
if (enclosing_list == NULL) {
return NULL;
}
}
return enclosing_list;
}
else if (multiparam_size == 1) {
zero_element = PyTuple_GetItem(multiparams, 0);
if (PyTuple_Check(zero_element) || PyList_Check(zero_element)) {
zero_element_length = PySequence_Length(zero_element);
if (zero_element_length != 0) {
zero_element_item = PySequence_GetItem(zero_element, 0);
if (zero_element_item == NULL) {
return NULL;
}
}
else {
zero_element_item = NULL;
}
if (zero_element_length == 0 ||
(
PyObject_HasAttrString(zero_element_item, "__iter__") &&
!PyObject_HasAttrString(zero_element_item, "strip")
)
) {
/*
* execute(stmt, [{}, {}, {}, ...])
* execute(stmt, [(), (), (), ...])
*/
Py_XDECREF(zero_element_item);
Py_INCREF(zero_element);
return zero_element;
}
else {
/*
* execute(stmt, ("value", "value"))
*/
Py_XDECREF(zero_element_item);
enclosing_list = PyList_New(1);
if (enclosing_list == NULL) {
return NULL;
}
Py_INCREF(zero_element);
if (PyList_SetItem(enclosing_list, 0, zero_element) == -1) {
Py_DECREF(zero_element);
Py_DECREF(enclosing_list);
return NULL;
}
return enclosing_list;
}
}
else if (PyObject_HasAttrString(zero_element, "keys")) {
/*
* execute(stmt, {"key":"value"})
*/
enclosing_list = PyList_New(1);
if (enclosing_list == NULL) {
return NULL;
}
Py_INCREF(zero_element);
if (PyList_SetItem(enclosing_list, 0, zero_element) == -1) {
Py_DECREF(zero_element);
Py_DECREF(enclosing_list);
return NULL;
}
return enclosing_list;
} else {
enclosing_list = PyList_New(1);
if (enclosing_list == NULL) {
return NULL;
}
double_enclosing_list = PyList_New(1);
if (double_enclosing_list == NULL) {
Py_DECREF(enclosing_list);
return NULL;
}
Py_INCREF(zero_element);
if (PyList_SetItem(enclosing_list, 0, zero_element) == -1) {
Py_DECREF(zero_element);
Py_DECREF(enclosing_list);
Py_DECREF(double_enclosing_list);
return NULL;
}
if (PyList_SetItem(double_enclosing_list, 0, enclosing_list) == -1) {
Py_DECREF(zero_element);
Py_DECREF(enclosing_list);
Py_DECREF(double_enclosing_list);
return NULL;
}
return double_enclosing_list;
}
}
else {
zero_element = PyTuple_GetItem(multiparams, 0);
if (PyObject_HasAttrString(zero_element, "__iter__") &&
!PyObject_HasAttrString(zero_element, "strip")
) {
Py_INCREF(multiparams);
return multiparams;
}
else {
enclosing_list = PyList_New(1);
if (enclosing_list == NULL) {
return NULL;
}
Py_INCREF(multiparams);
if (PyList_SetItem(enclosing_list, 0, multiparams) == -1) {
Py_DECREF(multiparams);
Py_DECREF(enclosing_list);
return NULL;
}
return enclosing_list;
}
}
}
#ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif
static PyMethodDef module_methods[] = {
{"_distill_params", distill_params, METH_VARARGS,
"Distill an execute() parameter structure."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
PyMODINIT_FUNC
initcutils(void)
{
PyObject *m;
m = Py_InitModule3("cutils", module_methods,
"Internal utility functions.");
if (m == NULL)
return;
}
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