home *** CD-ROM | disk | FTP | other *** search
- /***********************************************************
- 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
- both that copyright notice and this permission notice appear in
- supporting documentation, and that the names of Stichting Mathematisch
- Centrum or CWI or Corporation for National Research Initiatives or
- CNRI not be used in advertising or publicity pertaining to
- distribution of the software without specific, written prior
- permission.
-
- While CWI is the initial source for this software, a modified version
- is made available by the Corporation for National Research Initiatives
- (CNRI) at the Internet address ftp://ftp.python.org.
-
- STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
- REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
- MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
- CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
- DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
- TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- PERFORMANCE OF THIS SOFTWARE.
-
- ******************************************************************/
-
- /* Module object implementation */
-
- #include "Python.h"
-
- typedef struct {
- PyObject_HEAD
- PyObject *md_dict;
- } PyModuleObject;
-
- #include "protos/moduleobject.h"
-
- PyObject *
- PyModule_New(name)
- char *name;
- {
- PyModuleObject *m;
- PyObject *nameobj;
- m = PyObject_NEW(PyModuleObject, &PyModule_Type);
- if (m == NULL)
- return NULL;
- nameobj = PyString_FromString(name);
- m->md_dict = PyDict_New();
- if (m->md_dict == NULL || nameobj == NULL)
- goto fail;
- if (PyDict_SetItemString(m->md_dict, "__name__", nameobj) != 0)
- goto fail;
- if (PyDict_SetItemString(m->md_dict, "__doc__", Py_None) != 0)
- goto fail;
- Py_DECREF(nameobj);
- return (PyObject *)m;
-
- fail:
- Py_XDECREF(nameobj);
- Py_DECREF(m);
- return NULL;
- }
-
- PyObject *
- PyModule_GetDict(m)
- PyObject *m;
- {
- if (!PyModule_Check(m)) {
- PyErr_BadInternalCall();
- return NULL;
- }
- return ((PyModuleObject *)m) -> md_dict;
- }
-
- char *
- PyModule_GetName(m)
- PyObject *m;
- {
- PyObject *nameobj;
- if (!PyModule_Check(m)) {
- PyErr_BadArgument();
- return NULL;
- }
- nameobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
- "__name__");
- if (nameobj == NULL || !PyString_Check(nameobj)) {
- PyErr_SetString(PyExc_SystemError, "nameless module");
- return NULL;
- }
- return PyString_AsString(nameobj);
- }
-
- char *
- PyModule_GetFilename(m)
- PyObject *m;
- {
- PyObject *fileobj;
- if (!PyModule_Check(m)) {
- PyErr_BadArgument();
- return NULL;
- }
- fileobj = PyDict_GetItemString(((PyModuleObject *)m)->md_dict,
- "__file__");
- if (fileobj == NULL || !PyString_Check(fileobj)) {
- PyErr_SetString(PyExc_SystemError, "module filename missing");
- return NULL;
- }
- return PyString_AsString(fileobj);
- }
-
- void
- _PyModule_Clear(m)
- PyObject *m;
- {
- /* To make the execution order of destructors for global
- objects a bit more predictable, we first zap all objects
- whose name starts with a single underscore, before we clear
- the entire dictionary. We zap them by replacing them with
- None, rather than deleting them from the dictionary, to
- avoid rehashing the dictionary (to some extent). */
-
- int pos;
- PyObject *key, *value;
- PyObject *d;
-
- d = ((PyModuleObject *)m)->md_dict;
-
- /* First, clear only names starting with a single underscore */
- pos = 0;
- while (PyDict_Next(d, &pos, &key, &value)) {
- if (value != Py_None && PyString_Check(key)) {
- char *s = PyString_AsString(key);
- if (s[0] == '_' && s[1] != '_') {
- if (Py_VerboseFlag > 1)
- PySys_WriteStderr("# clear[1] %s\n", s);
- PyDict_SetItem(d, key, Py_None);
- }
- }
- }
-
- /* Next, clear all names except for __builtins__ */
- pos = 0;
- while (PyDict_Next(d, &pos, &key, &value)) {
- if (value != Py_None && PyString_Check(key)) {
- char *s = PyString_AsString(key);
- if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
- if (Py_VerboseFlag > 1)
- PySys_WriteStderr("# clear[2] %s\n", s);
- PyDict_SetItem(d, key, Py_None);
- }
- }
- }
-
- /* Note: we leave __builtins__ in place, so that destructors
- of non-global objects defined in this module can still use
- builtins, in particularly 'None'. */
-
- }
-
- /* Methods */
-
- static void
- module_dealloc(m)
- PyModuleObject *m;
- {
- if (m->md_dict != NULL) {
- _PyModule_Clear((PyObject *)m);
- Py_DECREF(m->md_dict);
- }
- free((char *)m);
- }
-
- static PyObject *
- module_repr(m)
- PyModuleObject *m;
- {
- char buf[400];
- char *name;
- char *filename;
- name = PyModule_GetName((PyObject *)m);
- if (name == NULL) {
- PyErr_Clear();
- name = "?";
- }
- filename = PyModule_GetFilename((PyObject *)m);
- if (filename == NULL) {
- PyErr_Clear();
- sprintf(buf, "<module '%.80s' (built-in)>", name);
- } else {
- sprintf(buf, "<module '%.80s' from '%.255s'>", name, filename);
- }
-
- return PyString_FromString(buf);
- }
-
- static PyObject *
- module_getattr(m, name)
- PyModuleObject *m;
- char *name;
- {
- PyObject *res;
- if (strcmp(name, "__dict__") == 0) {
- Py_INCREF(m->md_dict);
- return m->md_dict;
- }
- res = PyDict_GetItemString(m->md_dict, name);
- if (res == NULL)
- PyErr_SetString(PyExc_AttributeError, name);
- else
- Py_INCREF(res);
- return res;
- }
-
- static int
- module_setattr(m, name, v)
- PyModuleObject *m;
- char *name;
- PyObject *v;
- {
- if (name[0] == '_' && strcmp(name, "__dict__") == 0) {
- PyErr_SetString(PyExc_TypeError,
- "read-only special attribute");
- return -1;
- }
- if (v == NULL) {
- int rv = PyDict_DelItemString(m->md_dict, name);
- if (rv < 0)
- PyErr_SetString(PyExc_AttributeError,
- "delete non-existing module attribute");
- return rv;
- }
- else
- return PyDict_SetItemString(m->md_dict, name, v);
- }
-
- PyTypeObject PyModule_Type = {
- PyObject_HEAD_INIT(&PyType_Type)
- 0, /*ob_size*/
- "module", /*tp_name*/
- sizeof(PyModuleObject), /*tp_size*/
- 0, /*tp_itemsize*/
- (destructor)module_dealloc, /*tp_dealloc*/
- 0, /*tp_print*/
- (getattrfunc)module_getattr, /*tp_getattr*/
- (setattrfunc)module_setattr, /*tp_setattr*/
- 0, /*tp_compare*/
- (reprfunc)module_repr, /*tp_repr*/
- };
-