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/*
Copyright (c) 1996-1998, Digital Creations, Fredericksburg, VA, USA.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
o Redistributions of source code must retain the above copyright
notice, this list of conditions, and the disclaimer that follows.
o Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
o Neither the name of Digital Creations nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS
IS* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.
$Id: Missing.c,v 1.8 1998/11/17 19:54:33 jim Exp $
If you have questions regarding this software,
contact:
Digital Creations L.C.
info@digicool.com
(540) 371-6909
*/
static char Missing_module_documentation[] =
""
"\n$Id: Missing.c,v 1.8 1998/11/17 19:54:33 jim Exp $"
;
#include "ExtensionClass.h"
/* Declarations for objects of type Missing */
typedef struct {
PyObject_HEAD
} Missing;
static PyObject *vname=0, *Missing_dot_Value=0, *empty_string=0, *reduce=0;
static PyObject *theValue;
static void
Missing_dealloc(Missing *self)
{
PyMem_DEL(self);
}
static PyObject *
Missing_repr(Missing *self)
{
Py_INCREF(Missing_dot_Value);
return Missing_dot_Value;
}
static PyObject *
Missing_str(Missing *self)
{
Py_INCREF(empty_string);
return empty_string;
}
/* Code to access Missing objects as numbers */
static PyObject *
Missing_bin(PyObject *v, PyObject *w)
{
Py_INCREF(v);
return v;
}
static PyObject *
Missing_pow(PyObject *v, PyObject *w, PyObject *z)
{
Py_INCREF(v);
return v;
}
static PyObject *
Missing_un(PyObject *v)
{
Py_INCREF(v);
return v;
}
static int
Missing_nonzero(PyObject *v)
{
return 0;
}
static int
Missing_coerce(PyObject **pv, PyObject **pw)
{
Py_INCREF(*pv);
Py_INCREF(*pw);
return 0;
}
static PyObject *
Missing_int(Missing *v)
{
PyErr_SetString(PyExc_TypeError,
"Missing objects do not support conversion to integer");
return NULL;
}
static PyObject *
Missing_long(Missing *v)
{
PyErr_SetString(PyExc_TypeError,
"Missing objects do not support conversion to long");
return NULL;
}
static PyObject *
Missing_float(Missing *v)
{
PyErr_SetString(PyExc_TypeError,
"Missing objects do not support conversion to float");
return NULL;
}
static PyObject *
Missing_oct(Missing *v)
{
PyErr_SetString(PyExc_TypeError,
"Missing objects do not support conversion to an octal string");
return NULL;
}
static PyObject *
Missing_hex(Missing *v)
{
PyErr_SetString(PyExc_TypeError,
"Missing objects do not support conversion to hexadecimal strings");
return NULL;
}
static PyNumberMethods Missing_as_number = {
(binaryfunc)Missing_bin, /*nb_add*/
(binaryfunc)Missing_bin, /*nb_subtract*/
(binaryfunc)Missing_bin, /*nb_multiply*/
(binaryfunc)Missing_bin, /*nb_divide*/
(binaryfunc)Missing_bin, /*nb_remainder*/
(binaryfunc)Missing_bin, /*nb_divmod*/
(ternaryfunc)Missing_pow, /*nb_power*/
(unaryfunc)Missing_un, /*nb_negative*/
(unaryfunc)Missing_un, /*nb_positive*/
(unaryfunc)Missing_un, /*nb_absolute*/
(inquiry)Missing_nonzero, /*nb_nonzero*/
(unaryfunc)Missing_un, /*nb_invert*/
(binaryfunc)Missing_bin, /*nb_lshift*/
(binaryfunc)Missing_bin, /*nb_rshift*/
(binaryfunc)Missing_bin, /*nb_and*/
(binaryfunc)Missing_bin, /*nb_xor*/
(binaryfunc)Missing_bin, /*nb_or*/
(coercion)Missing_coerce, /*nb_coerce*/
(unaryfunc)Missing_int, /*nb_int*/
(unaryfunc)Missing_long, /*nb_long*/
(unaryfunc)Missing_float, /*nb_float*/
(unaryfunc)Missing_oct, /*nb_oct*/
(unaryfunc)Missing_hex, /*nb_hex*/
};
/* ------------------------------------------------------- */
static PyObject *
Missing_reduce(PyObject *self, PyObject *args, PyObject *kw)
{
if(self==theValue)
{
Py_INCREF(vname);
return vname;
}
return Py_BuildValue("O()",self->ob_type);
}
static struct PyMethodDef reduce_ml[] = {
{"__reduce__", (PyCFunction)Missing_reduce, 1,
"Return a missing value reduced to standard python objects"
}
};
static PyObject *
Missing_getattr(PyObject *self, PyObject *name)
{
char *c;
if(!(c=PyString_AsString(name))) return NULL;
if(*c=='_')
{
if(strcmp(c,"__reduce__")==0)
{
if(self==theValue)
{
Py_INCREF(reduce);
return reduce;
}
return PyCFunction_New(reduce_ml, self);
}
PyErr_SetObject(PyExc_AttributeError, name);
return NULL;
}
Py_INCREF(self);
return self;
}
static PyObject *
Missing_call(PyObject *self, PyObject *args, PyObject *kw)
{
Py_INCREF(self);
return self;
}
static int
Missing_cmp(Missing *m1, Missing *m2)
{
return m1->ob_type != m2->ob_type ;
}
static PyExtensionClass MissingType = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"Missing", /*tp_name*/
sizeof(Missing), /*tp_basicsize*/
0, /*tp_itemsize*/
/* methods */
(destructor)Missing_dealloc, /*tp_dealloc*/
(printfunc)0, /*tp_print*/
(getattrfunc)0, /*obsolete tp_getattr*/
(setattrfunc)0, /*obsolete tp_setattr*/
(cmpfunc)Missing_cmp, /*tp_compare*/
(reprfunc)Missing_repr, /*tp_repr*/
&Missing_as_number, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
(hashfunc)0, /*tp_hash*/
(ternaryfunc)Missing_call, /*tp_call*/
(reprfunc)Missing_str, /*tp_str*/
(getattrofunc)Missing_getattr, /*tp_getattro*/
(setattrofunc)0, /*tp_setattro*/
/* Space for future expansion */
0L,0L,
"Represent totally unknown quantities\n"
"\n"
"Missing values are used to represent numberic quantities that are\n"
"unknown. They support all mathematical operations except\n"
"conversions by returning themselves.\n",
METHOD_CHAIN(NULL)
};
/* End of code for Missing objects */
/* -------------------------------------------------------- */
/* List of methods defined in the module */
static struct PyMethodDef Module_Level__methods[] = {
{NULL, (PyCFunction)NULL, 0, NULL} /* sentinel */
};
void
initMissing()
{
PyObject *m, *d;
char *rev="$Revision: 1.8 $";
if(! ((vname=PyString_FromString("V"))
&& (Missing_dot_Value=PyString_FromString("Missing.Value"))
&& (empty_string=PyString_FromString(""))
)) return;
/* Create the module and add the functions */
m = Py_InitModule4("Missing", Module_Level__methods,
Missing_module_documentation,
(PyObject*)NULL,PYTHON_API_VERSION);
/* Add some symbolic constants to the module */
d = PyModule_GetDict(m);
PyDict_SetItemString(d, "__version__",
PyString_FromStringAndSize(rev+11,strlen(rev+11)-2));
PyExtensionClass_Export(d,"Missing",MissingType);
theValue=PyObject_CallObject((PyObject*)&MissingType, NULL);
reduce=PyCFunction_New(reduce_ml, theValue);
PyDict_SetItemString(d, "Value", theValue);
PyDict_SetItemString(d, "V", theValue);
PyDict_SetItemString(d, "MV", theValue);
/* Check for errors */
if (PyErr_Occurred())
Py_FatalError("can't initialize module Missing");
}
/*****************************************************************************
Revision Log:
$Log: Missing.c,v $
Revision 1.8 1998/11/17 19:54:33 jim
new copyright.
Revision 1.7 1997/10/03 14:43:27 jim
Fixed comparison bug, again :-(
Revision 1.6 1997/09/23 16:06:03 jim
Added MV member.
Revision 1.5 1997/09/23 15:17:12 jim
Added cmp.
Revision 1.4 1997/09/18 21:01:33 jim
Added check to getattr to fail on methods that begin with underscore.
Note that Missing really defeats testing from protocols by testing for
attributes.
Revision 1.3 1997/09/17 22:49:35 jim
Fixed refcount bug.
Added logic so: Missing.Value.spam() returns Missing.Value.
Added logic to make Missing.Value picklable.
Revision 1.2 1997/07/02 20:19:37 jim
Got rid of unused macros and ErrorObject.
Revision 1.1 1997/07/01 21:36:34 jim
*****************************************************************************/
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