cpython/Modules/newmodule.c

/***********************************************************
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
The Netherlands.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
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While CWI is the initial source for this software, a modified version
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/* Module new -- create new objects of various types */

#include "Python.h"
#include "compile.h"

static char new_instance_doc[] =
"Create an instance object from (CLASS, DICT) without calling its __init__().";

static PyObject *
new_instance(unused, args)
	PyObject* unused;
	PyObject* args;
{
	PyObject* klass;
	PyObject *dict;
	PyInstanceObject *inst;
	if (!PyArg_ParseTuple(args, "O!O!",
			      &PyClass_Type, &klass,
			      &PyDict_Type, &dict))
		return NULL;
	inst = PyObject_NEW(PyInstanceObject, &PyInstance_Type);
	if (inst == NULL)
		return NULL;
	Py_INCREF(klass);
	Py_INCREF(dict);
	inst->in_class = (PyClassObject *)klass;
	inst->in_dict = dict;
	return (PyObject *)inst;
}

static char new_im_doc[] =
"Create a instance method object from (FUNCTION, INSTANCE, CLASS).";

static PyObject *
new_instancemethod(unused, args)
	PyObject* unused;
	PyObject* args;
{
	PyObject* func;
	PyObject* self;
	PyObject* classObj;

	if (!PyArg_ParseTuple(args, "OOO!",
			      &func,
			      &self,
			      &PyClass_Type, &classObj))
		return NULL;
	if (!PyCallable_Check(func)) {
		PyErr_SetString(PyExc_TypeError,
				"first argument must be callable");
		return NULL;
	}
	if (self == Py_None)
		self = NULL;
	else if (!PyInstance_Check(self)) {
		PyErr_SetString(PyExc_TypeError,
				"second argument must be instance or None");
		return NULL;
	}
	return PyMethod_New(func, self, classObj);
}

static char new_function_doc[] =
"Create a function object from (CODE, GLOBALS, [NAME, ARGDEFS]).";

static PyObject *
new_function(unused, args)
	PyObject* unused;
	PyObject* args;
{
	PyObject* code;
	PyObject* globals;
	PyObject* name = Py_None;
	PyObject* defaults = Py_None;
	PyFunctionObject* newfunc;

	if (!PyArg_ParseTuple(args, "O!O!|SO!",
			      &PyCode_Type, &code,
			      &PyDict_Type, &globals,
			      &name,
			      &PyTuple_Type, &defaults))
		return NULL;

	newfunc = (PyFunctionObject *)PyFunction_New(code, globals);
	if (newfunc == NULL)
		return NULL;

	if (name != Py_None) {
		Py_XINCREF(name);
		Py_XDECREF(newfunc->func_name);
		newfunc->func_name = name;
	}
	if (defaults != Py_None) {
		Py_XINCREF(defaults);
		Py_XDECREF(newfunc->func_defaults);
		newfunc->func_defaults  = defaults;
	}

	return (PyObject *)newfunc;
}

static char new_code_doc[] =
"Create a code object from (ARGCOUNT, NLOCALS, STACKSIZE, FLAGS, CODESTRING, CONSTANTS, NAMES, VARNAMES, FILENAME, NAME, FIRSTLINENO, LNOTAB).";

static PyObject *
new_code(unused, args)
	PyObject* unused;
	PyObject* args;
{
	int argcount;
	int nlocals;
	int stacksize;
	int flags;
	PyObject* code;
	PyObject* consts;
	PyObject* names;
	PyObject* varnames;
	PyObject* filename;
	PyObject* name;
	int firstlineno;
	PyObject* lnotab;
	PyBufferProcs *pb;

	if (!PyArg_ParseTuple(args, "iiiiOO!O!O!SSiS",
			      &argcount, &nlocals, &stacksize, &flags,
			      &code,
			      &PyTuple_Type, &consts,
			      &PyTuple_Type, &names,
			      &PyTuple_Type, &varnames,
			      &filename, &name,
			      &firstlineno, &lnotab))
		return NULL;

	pb = code->ob_type->tp_as_buffer;
	if (pb == NULL ||
	    pb->bf_getreadbuffer == NULL ||
	    pb->bf_getsegcount == NULL ||
	    (*pb->bf_getsegcount)(code, NULL) != 1)
	{
		PyErr_SetString(PyExc_TypeError,
		  "bytecode object must be a single-segment read-only buffer");
		return NULL;
	}

	return (PyObject *)PyCode_New(argcount, nlocals, stacksize, flags,
				      code, consts, names, varnames,
				      filename, name, firstlineno, lnotab);
}

static char new_module_doc[] =
"Create a module object from (NAME).";

static PyObject *
new_module(unused, args)
	PyObject* unused;
	PyObject* args;
{
	char *name;
  
	if (!PyArg_ParseTuple(args, "s", &name))
		return NULL;
	return PyModule_New(name);
}

static char new_class_doc[] =
"Create a class object from (NAME, BASE_CLASSES, DICT).";

static PyObject *
new_class(unused, args)
	PyObject* unused;
	PyObject* args;
{
	PyObject * name;
	PyObject * classes;
	PyObject * dict;
  
	if (!PyArg_ParseTuple(args, "SO!O!", &name, &PyTuple_Type, &classes,
			      &PyDict_Type, &dict))
		return NULL;
	return PyClass_New(classes, dict, name);
}

static PyMethodDef new_methods[] = {
	{"instance",		new_instance,		1, new_instance_doc},
	{"instancemethod",	new_instancemethod,	1, new_im_doc},
	{"function",		new_function,		1, new_function_doc},
	{"code",		new_code,		1, new_code_doc},
	{"module",		new_module,		1, new_module_doc},
	{"classobj",		new_class,		1, new_class_doc},
	{NULL,			NULL}		/* sentinel */
};

char new_doc[] =
"Functions to create new objects used by the interpreter.\n\
\n\
You need to know a great deal about the interpreter to use this!";

DL_EXPORT(void)
initnew()
{
	Py_InitModule4("new", new_methods, new_doc, (PyObject *)NULL,
		       PYTHON_API_VERSION);
}