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dibbler/sqlalchemy/cextension/processors.c

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/*
processors.c
Copyright (C) 2010-2017 the SQLAlchemy authors and contributors <see AUTHORS file>
Copyright (C) 2010-2011 Gaetan de Menten gdementen@gmail.com
This module is part of SQLAlchemy and is released under
the MIT License: http://www.opensource.org/licenses/mit-license.php
*/
#include <Python.h>
#include <datetime.h>
#define MODULE_NAME "cprocessors"
#define MODULE_DOC "Module containing C versions of data processing functions."
#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
#endif
static PyObject *
int_to_boolean(PyObject *self, PyObject *arg)
{
int l = 0;
PyObject *res;
if (arg == Py_None)
Py_RETURN_NONE;
l = PyObject_IsTrue(arg);
if (l == 0) {
res = Py_False;
} else if (l == 1) {
res = Py_True;
} else {
return NULL;
}
Py_INCREF(res);
return res;
}
static PyObject *
to_str(PyObject *self, PyObject *arg)
{
if (arg == Py_None)
Py_RETURN_NONE;
return PyObject_Str(arg);
}
static PyObject *
to_float(PyObject *self, PyObject *arg)
{
if (arg == Py_None)
Py_RETURN_NONE;
return PyNumber_Float(arg);
}
static PyObject *
str_to_datetime(PyObject *self, PyObject *arg)
{
#if PY_MAJOR_VERSION >= 3
PyObject *bytes;
PyObject *err_bytes;
#endif
const char *str;
int numparsed;
unsigned int year, month, day, hour, minute, second, microsecond = 0;
PyObject *err_repr;
if (arg == Py_None)
Py_RETURN_NONE;
#if PY_MAJOR_VERSION >= 3
bytes = PyUnicode_AsASCIIString(arg);
if (bytes == NULL)
str = NULL;
else
str = PyBytes_AS_STRING(bytes);
#else
str = PyString_AsString(arg);
#endif
if (str == NULL) {
err_repr = PyObject_Repr(arg);
if (err_repr == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
err_bytes = PyUnicode_AsASCIIString(err_repr);
if (err_bytes == NULL)
return NULL;
PyErr_Format(
PyExc_ValueError,
"Couldn't parse datetime string '%.200s' "
"- value is not a string.",
PyBytes_AS_STRING(err_bytes));
Py_DECREF(err_bytes);
#else
PyErr_Format(
PyExc_ValueError,
"Couldn't parse datetime string '%.200s' "
"- value is not a string.",
PyString_AsString(err_repr));
#endif
Py_DECREF(err_repr);
return NULL;
}
/* microseconds are optional */
/*
TODO: this is slightly less picky than the Python version which would
not accept "2000-01-01 00:00:00.". I don't know which is better, but they
should be coherent.
*/
numparsed = sscanf(str, "%4u-%2u-%2u %2u:%2u:%2u.%6u", &year, &month, &day,
&hour, &minute, &second, &microsecond);
#if PY_MAJOR_VERSION >= 3
Py_DECREF(bytes);
#endif
if (numparsed < 6) {
err_repr = PyObject_Repr(arg);
if (err_repr == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
err_bytes = PyUnicode_AsASCIIString(err_repr);
if (err_bytes == NULL)
return NULL;
PyErr_Format(
PyExc_ValueError,
"Couldn't parse datetime string: %.200s",
PyBytes_AS_STRING(err_bytes));
Py_DECREF(err_bytes);
#else
PyErr_Format(
PyExc_ValueError,
"Couldn't parse datetime string: %.200s",
PyString_AsString(err_repr));
#endif
Py_DECREF(err_repr);
return NULL;
}
return PyDateTime_FromDateAndTime(year, month, day,
hour, minute, second, microsecond);
}
static PyObject *
str_to_time(PyObject *self, PyObject *arg)
{
#if PY_MAJOR_VERSION >= 3
PyObject *bytes;
PyObject *err_bytes;
#endif
const char *str;
int numparsed;
unsigned int hour, minute, second, microsecond = 0;
PyObject *err_repr;
if (arg == Py_None)
Py_RETURN_NONE;
#if PY_MAJOR_VERSION >= 3
bytes = PyUnicode_AsASCIIString(arg);
if (bytes == NULL)
str = NULL;
else
str = PyBytes_AS_STRING(bytes);
#else
str = PyString_AsString(arg);
#endif
if (str == NULL) {
err_repr = PyObject_Repr(arg);
if (err_repr == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
err_bytes = PyUnicode_AsASCIIString(err_repr);
if (err_bytes == NULL)
return NULL;
PyErr_Format(
PyExc_ValueError,
"Couldn't parse time string '%.200s' - value is not a string.",
PyBytes_AS_STRING(err_bytes));
Py_DECREF(err_bytes);
#else
PyErr_Format(
PyExc_ValueError,
"Couldn't parse time string '%.200s' - value is not a string.",
PyString_AsString(err_repr));
#endif
Py_DECREF(err_repr);
return NULL;
}
/* microseconds are optional */
/*
TODO: this is slightly less picky than the Python version which would
not accept "00:00:00.". I don't know which is better, but they should be
coherent.
*/
numparsed = sscanf(str, "%2u:%2u:%2u.%6u", &hour, &minute, &second,
&microsecond);
#if PY_MAJOR_VERSION >= 3
Py_DECREF(bytes);
#endif
if (numparsed < 3) {
err_repr = PyObject_Repr(arg);
if (err_repr == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
err_bytes = PyUnicode_AsASCIIString(err_repr);
if (err_bytes == NULL)
return NULL;
PyErr_Format(
PyExc_ValueError,
"Couldn't parse time string: %.200s",
PyBytes_AS_STRING(err_bytes));
Py_DECREF(err_bytes);
#else
PyErr_Format(
PyExc_ValueError,
"Couldn't parse time string: %.200s",
PyString_AsString(err_repr));
#endif
Py_DECREF(err_repr);
return NULL;
}
return PyTime_FromTime(hour, minute, second, microsecond);
}
static PyObject *
str_to_date(PyObject *self, PyObject *arg)
{
#if PY_MAJOR_VERSION >= 3
PyObject *bytes;
PyObject *err_bytes;
#endif
const char *str;
int numparsed;
unsigned int year, month, day;
PyObject *err_repr;
if (arg == Py_None)
Py_RETURN_NONE;
#if PY_MAJOR_VERSION >= 3
bytes = PyUnicode_AsASCIIString(arg);
if (bytes == NULL)
str = NULL;
else
str = PyBytes_AS_STRING(bytes);
#else
str = PyString_AsString(arg);
#endif
if (str == NULL) {
err_repr = PyObject_Repr(arg);
if (err_repr == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
err_bytes = PyUnicode_AsASCIIString(err_repr);
if (err_bytes == NULL)
return NULL;
PyErr_Format(
PyExc_ValueError,
"Couldn't parse date string '%.200s' - value is not a string.",
PyBytes_AS_STRING(err_bytes));
Py_DECREF(err_bytes);
#else
PyErr_Format(
PyExc_ValueError,
"Couldn't parse date string '%.200s' - value is not a string.",
PyString_AsString(err_repr));
#endif
Py_DECREF(err_repr);
return NULL;
}
numparsed = sscanf(str, "%4u-%2u-%2u", &year, &month, &day);
#if PY_MAJOR_VERSION >= 3
Py_DECREF(bytes);
#endif
if (numparsed != 3) {
err_repr = PyObject_Repr(arg);
if (err_repr == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
err_bytes = PyUnicode_AsASCIIString(err_repr);
if (err_bytes == NULL)
return NULL;
PyErr_Format(
PyExc_ValueError,
"Couldn't parse date string: %.200s",
PyBytes_AS_STRING(err_bytes));
Py_DECREF(err_bytes);
#else
PyErr_Format(
PyExc_ValueError,
"Couldn't parse date string: %.200s",
PyString_AsString(err_repr));
#endif
Py_DECREF(err_repr);
return NULL;
}
return PyDate_FromDate(year, month, day);
}
/***********
* Structs *
***********/
typedef struct {
PyObject_HEAD
PyObject *encoding;
PyObject *errors;
} UnicodeResultProcessor;
typedef struct {
PyObject_HEAD
PyObject *type;
PyObject *format;
} DecimalResultProcessor;
/**************************
* UnicodeResultProcessor *
**************************/
static int
UnicodeResultProcessor_init(UnicodeResultProcessor *self, PyObject *args,
PyObject *kwds)
{
PyObject *encoding, *errors = NULL;
static char *kwlist[] = {"encoding", "errors", NULL};
#if PY_MAJOR_VERSION >= 3
if (!PyArg_ParseTupleAndKeywords(args, kwds, "U|U:__init__", kwlist,
&encoding, &errors))
return -1;
#else
if (!PyArg_ParseTupleAndKeywords(args, kwds, "S|S:__init__", kwlist,
&encoding, &errors))
return -1;
#endif
#if PY_MAJOR_VERSION >= 3
encoding = PyUnicode_AsASCIIString(encoding);
#else
Py_INCREF(encoding);
#endif
self->encoding = encoding;
if (errors) {
#if PY_MAJOR_VERSION >= 3
errors = PyUnicode_AsASCIIString(errors);
#else
Py_INCREF(errors);
#endif
} else {
#if PY_MAJOR_VERSION >= 3
errors = PyBytes_FromString("strict");
#else
errors = PyString_FromString("strict");
#endif
if (errors == NULL)
return -1;
}
self->errors = errors;
return 0;
}
static PyObject *
UnicodeResultProcessor_process(UnicodeResultProcessor *self, PyObject *value)
{
const char *encoding, *errors;
char *str;
Py_ssize_t len;
if (value == Py_None)
Py_RETURN_NONE;
#if PY_MAJOR_VERSION >= 3
if (PyBytes_AsStringAndSize(value, &str, &len))
return NULL;
encoding = PyBytes_AS_STRING(self->encoding);
errors = PyBytes_AS_STRING(self->errors);
#else
if (PyString_AsStringAndSize(value, &str, &len))
return NULL;
encoding = PyString_AS_STRING(self->encoding);
errors = PyString_AS_STRING(self->errors);
#endif
return PyUnicode_Decode(str, len, encoding, errors);
}
static PyObject *
UnicodeResultProcessor_conditional_process(UnicodeResultProcessor *self, PyObject *value)
{
const char *encoding, *errors;
char *str;
Py_ssize_t len;
if (value == Py_None)
Py_RETURN_NONE;
#if PY_MAJOR_VERSION >= 3
if (PyUnicode_Check(value) == 1) {
Py_INCREF(value);
return value;
}
if (PyBytes_AsStringAndSize(value, &str, &len))
return NULL;
encoding = PyBytes_AS_STRING(self->encoding);
errors = PyBytes_AS_STRING(self->errors);
#else
if (PyUnicode_Check(value) == 1) {
Py_INCREF(value);
return value;
}
if (PyString_AsStringAndSize(value, &str, &len))
return NULL;
encoding = PyString_AS_STRING(self->encoding);
errors = PyString_AS_STRING(self->errors);
#endif
return PyUnicode_Decode(str, len, encoding, errors);
}
static void
UnicodeResultProcessor_dealloc(UnicodeResultProcessor *self)
{
Py_XDECREF(self->encoding);
Py_XDECREF(self->errors);
#if PY_MAJOR_VERSION >= 3
Py_TYPE(self)->tp_free((PyObject*)self);
#else
self->ob_type->tp_free((PyObject*)self);
#endif
}
static PyMethodDef UnicodeResultProcessor_methods[] = {
{"process", (PyCFunction)UnicodeResultProcessor_process, METH_O,
"The value processor itself."},
{"conditional_process", (PyCFunction)UnicodeResultProcessor_conditional_process, METH_O,
"Conditional version of the value processor."},
{NULL} /* Sentinel */
};
static PyTypeObject UnicodeResultProcessorType = {
PyVarObject_HEAD_INIT(NULL, 0)
"sqlalchemy.cprocessors.UnicodeResultProcessor", /* tp_name */
sizeof(UnicodeResultProcessor), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)UnicodeResultProcessor_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
"UnicodeResultProcessor objects", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
UnicodeResultProcessor_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)UnicodeResultProcessor_init, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
};
/**************************
* DecimalResultProcessor *
**************************/
static int
DecimalResultProcessor_init(DecimalResultProcessor *self, PyObject *args,
PyObject *kwds)
{
PyObject *type, *format;
#if PY_MAJOR_VERSION >= 3
if (!PyArg_ParseTuple(args, "OU", &type, &format))
#else
if (!PyArg_ParseTuple(args, "OS", &type, &format))
#endif
return -1;
Py_INCREF(type);
self->type = type;
Py_INCREF(format);
self->format = format;
return 0;
}
static PyObject *
DecimalResultProcessor_process(DecimalResultProcessor *self, PyObject *value)
{
PyObject *str, *result, *args;
if (value == Py_None)
Py_RETURN_NONE;
/* Decimal does not accept float values directly */
/* SQLite can also give us an integer here (see [ticket:2432]) */
/* XXX: starting with Python 3.1, we could use Decimal.from_float(f),
but the result wouldn't be the same */
args = PyTuple_Pack(1, value);
if (args == NULL)
return NULL;
#if PY_MAJOR_VERSION >= 3
str = PyUnicode_Format(self->format, args);
#else
str = PyString_Format(self->format, args);
#endif
Py_DECREF(args);
if (str == NULL)
return NULL;
result = PyObject_CallFunctionObjArgs(self->type, str, NULL);
Py_DECREF(str);
return result;
}
static void
DecimalResultProcessor_dealloc(DecimalResultProcessor *self)
{
Py_XDECREF(self->type);
Py_XDECREF(self->format);
#if PY_MAJOR_VERSION >= 3
Py_TYPE(self)->tp_free((PyObject*)self);
#else
self->ob_type->tp_free((PyObject*)self);
#endif
}
static PyMethodDef DecimalResultProcessor_methods[] = {
{"process", (PyCFunction)DecimalResultProcessor_process, METH_O,
"The value processor itself."},
{NULL} /* Sentinel */
};
static PyTypeObject DecimalResultProcessorType = {
PyVarObject_HEAD_INIT(NULL, 0)
"sqlalchemy.DecimalResultProcessor", /* tp_name */
sizeof(DecimalResultProcessor), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)DecimalResultProcessor_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
"DecimalResultProcessor objects", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
DecimalResultProcessor_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)DecimalResultProcessor_init, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
};
static PyMethodDef module_methods[] = {
{"int_to_boolean", int_to_boolean, METH_O,
"Convert an integer to a boolean."},
{"to_str", to_str, METH_O,
"Convert any value to its string representation."},
{"to_float", to_float, METH_O,
"Convert any value to its floating point representation."},
{"str_to_datetime", str_to_datetime, METH_O,
"Convert an ISO string to a datetime.datetime object."},
{"str_to_time", str_to_time, METH_O,
"Convert an ISO string to a datetime.time object."},
{"str_to_date", str_to_date, METH_O,
"Convert an ISO string to a datetime.date object."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
#ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif
#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef module_def = {
PyModuleDef_HEAD_INIT,
MODULE_NAME,
MODULE_DOC,
-1,
module_methods
};
#define INITERROR return NULL
PyMODINIT_FUNC
PyInit_cprocessors(void)
#else
#define INITERROR return
PyMODINIT_FUNC
initcprocessors(void)
#endif
{
PyObject *m;
UnicodeResultProcessorType.tp_new = PyType_GenericNew;
if (PyType_Ready(&UnicodeResultProcessorType) < 0)
INITERROR;
DecimalResultProcessorType.tp_new = PyType_GenericNew;
if (PyType_Ready(&DecimalResultProcessorType) < 0)
INITERROR;
#if PY_MAJOR_VERSION >= 3
m = PyModule_Create(&module_def);
#else
m = Py_InitModule3(MODULE_NAME, module_methods, MODULE_DOC);
#endif
if (m == NULL)
INITERROR;
PyDateTime_IMPORT;
Py_INCREF(&UnicodeResultProcessorType);
PyModule_AddObject(m, "UnicodeResultProcessor",
(PyObject *)&UnicodeResultProcessorType);
Py_INCREF(&DecimalResultProcessorType);
PyModule_AddObject(m, "DecimalResultProcessor",
(PyObject *)&DecimalResultProcessorType);
#if PY_MAJOR_VERSION >= 3
return m;
#endif
}
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