[mirror_frr.git] / lib / command_py.c

/*
 * clippy (CLI preparator in python) wrapper for FRR command_graph
 * Copyright (C) 2016-2017  David Lamparter for NetDEF, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* note: this wrapper is intended to be used as build-time helper.  while
 * it should be generally correct and proper, there may be the occasional
 * memory leak or SEGV for things that haven't been well-tested.
 */

/* This file is "exempt" from having
#include "config.h"
 * as the first include statement because Python.h also does environment
 * setup & these trample over each other.
 */

#include <Python.h>
#include "structmember.h"
#include <string.h>
#include <stdlib.h>

#include "command_graph.h"
#include "clippy.h"

struct wrap_graph;
static PyObject *graph_to_pyobj(struct wrap_graph *graph,
				struct graph_node *gn);

/*
 * nodes are wrapped as follows:
 *  - instances can only be acquired from a graph
 *  - the same node will return the same wrapper object (they're buffered
 *    through "idx")
 *  - a reference is held onto the graph
 *  - fields are copied for easy access with PyMemberDef
 */
struct wrap_graph_node {
	PyObject_HEAD

		bool allowrepeat;
	const char *type;

	bool deprecated;
	bool hidden;
	const char *text;
	const char *desc;
	const char *varname;
	long long min, max;

	struct graph_node *node;
	struct wrap_graph *wgraph;
	size_t idx;
};

/*
 * graphs are wrapped as follows:
 *  - they can only be created by parsing a definition string
 *  - there's a table here for the wrapped nodes (nodewrappers), indexed
 *    by "idx" (corresponds to node's position in graph's table of nodes)
 *  - graphs do NOT hold references to nodes (would be circular)
 */
struct wrap_graph {
	PyObject_HEAD

		char *definition;
	struct graph *graph;
	struct wrap_graph_node **nodewrappers;
};

static PyObject *refuse_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	PyErr_SetString(PyExc_ValueError,
			"cannot create instances of this type");
	return NULL;
}

#define member(name, type)                                                     \
	{                                                                      \
		(char *)#name, type, offsetof(struct wrap_graph_node, name),   \
			READONLY, (char *)#name " (" #type ")"                 \
	}
static PyMemberDef members_graph_node[] = {
	member(allowrepeat, T_BOOL), member(type, T_STRING),
	member(deprecated, T_BOOL),  member(hidden, T_BOOL),
	member(text, T_STRING),      member(desc, T_STRING),
	member(min, T_LONGLONG),     member(max, T_LONGLONG),
	member(varname, T_STRING),   {},
};
#undef member

/*
 * node.next() -- returns list of all "next" nodes.
 * this will include circles if the graph has them.
 */
static PyObject *graph_node_next(PyObject *self, PyObject *args)
{
	struct wrap_graph_node *wrap = (struct wrap_graph_node *)self;
	PyObject *pylist;

	if (wrap->node->data
	    && ((struct cmd_token *)wrap->node->data)->type == END_TKN)
		return PyList_New(0);
	pylist = PyList_New(vector_active(wrap->node->to));
	for (size_t i = 0; i < vector_active(wrap->node->to); i++) {
		struct graph_node *gn = vector_slot(wrap->node->to, i);
		PyList_SetItem(pylist, i, graph_to_pyobj(wrap->wgraph, gn));
	}
	return pylist;
};

/*
 * node.join() -- return FORK's JOIN node or None
 */
static PyObject *graph_node_join(PyObject *self, PyObject *args)
{
	struct wrap_graph_node *wrap = (struct wrap_graph_node *)self;

	if (!wrap->node->data
	    || ((struct cmd_token *)wrap->node->data)->type == END_TKN)
		Py_RETURN_NONE;

	struct cmd_token *tok = wrap->node->data;
	if (tok->type != FORK_TKN)
		Py_RETURN_NONE;

	return graph_to_pyobj(wrap->wgraph, tok->forkjoin);
};

static PyMethodDef methods_graph_node[] = {
	{"next", graph_node_next, METH_NOARGS, "outbound graph edge list"},
	{"join", graph_node_join, METH_NOARGS, "outbound join node"},
	{}};

static void graph_node_wrap_free(void *arg)
{
	struct wrap_graph_node *wrap = arg;
	wrap->wgraph->nodewrappers[wrap->idx] = NULL;
	Py_DECREF(wrap->wgraph);
}

static PyTypeObject typeobj_graph_node = {
	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.GraphNode",
	.tp_basicsize = sizeof(struct wrap_graph_node),
	.tp_flags = Py_TPFLAGS_DEFAULT,
	.tp_doc = "struct graph_node *",
	.tp_new = refuse_new,
	.tp_free = graph_node_wrap_free,
	.tp_members = members_graph_node,
	.tp_methods = methods_graph_node,
};

static PyObject *graph_to_pyobj(struct wrap_graph *wgraph,
				struct graph_node *gn)
{
	struct wrap_graph_node *wrap;
	size_t i;

	for (i = 0; i < vector_active(wgraph->graph->nodes); i++)
		if (vector_slot(wgraph->graph->nodes, i) == gn)
			break;
	if (i == vector_active(wgraph->graph->nodes)) {
		PyErr_SetString(PyExc_ValueError, "cannot find node in graph");
		return NULL;
	}
	if (wgraph->nodewrappers[i]) {
		PyObject *obj = (PyObject *)wgraph->nodewrappers[i];
		Py_INCREF(obj);
		return obj;
	}

	wrap = (struct wrap_graph_node *)typeobj_graph_node.tp_alloc(
		&typeobj_graph_node, 0);
	if (!wrap)
		return NULL;
	wgraph->nodewrappers[i] = wrap;
	Py_INCREF(wgraph);

	wrap->idx = i;
	wrap->wgraph = wgraph;
	wrap->node = gn;
	wrap->type = "NULL";
	wrap->allowrepeat = false;
	if (gn->data) {
		struct cmd_token *tok = gn->data;
		switch (tok->type) {
#define item(x) case x: wrap->type = #x; break;
			item(WORD_TKN)		      // words
				item(VARIABLE_TKN)    // almost anything
				item(RANGE_TKN)       // integer range
				item(IPV4_TKN)	// IPV4 addresses
				item(IPV4_PREFIX_TKN) // IPV4 network prefixes
				item(IPV6_TKN)	// IPV6 prefixes
				item(IPV6_PREFIX_TKN) // IPV6 network prefixes
				item(MAC_TKN)	 // MAC address
				item(MAC_PREFIX_TKN)  // MAC address with mask

				/* plumbing types */
				item(FORK_TKN) item(JOIN_TKN) item(START_TKN)
					item(END_TKN) default
				: wrap->type = "???";
		}

		wrap->deprecated = (tok->attr == CMD_ATTR_DEPRECATED);
		wrap->hidden = (tok->attr == CMD_ATTR_HIDDEN);
		wrap->text = tok->text;
		wrap->desc = tok->desc;
		wrap->varname = tok->varname;
		wrap->min = tok->min;
		wrap->max = tok->max;
		wrap->allowrepeat = tok->allowrepeat;
	}

	return (PyObject *)wrap;
}

#define member(name, type)                                                     \
	{                                                                      \
		(char *)#name, type, offsetof(struct wrap_graph, name),        \
			READONLY, (char *)#name " (" #type ")"                 \
	}
static PyMemberDef members_graph[] = {
	member(definition, T_STRING),
	{},
};
#undef member

/* graph.first() - root node */
static PyObject *graph_first(PyObject *self, PyObject *args)
{
	struct wrap_graph *gwrap = (struct wrap_graph *)self;
	struct graph_node *gn = vector_slot(gwrap->graph->nodes, 0);
	return graph_to_pyobj(gwrap, gn);
};

static PyMethodDef methods_graph[] = {
	{"first", graph_first, METH_NOARGS, "first graph node"},
	{}};

static PyObject *graph_parse(PyTypeObject *type, PyObject *args,
			     PyObject *kwds);

static void graph_wrap_free(void *arg)
{
	struct wrap_graph *wgraph = arg;

	graph_delete_graph(wgraph->graph);
	free(wgraph->nodewrappers);
	free(wgraph->definition);
}

static PyTypeObject typeobj_graph = {
	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.Graph",
	.tp_basicsize = sizeof(struct wrap_graph),
	.tp_flags = Py_TPFLAGS_DEFAULT,
	.tp_doc = "struct graph *",
	.tp_new = graph_parse,
	.tp_free = graph_wrap_free,
	.tp_members = members_graph,
	.tp_methods = methods_graph,
};

/* top call / entrypoint for python code */
static PyObject *graph_parse(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
	const char *def, *doc = NULL;
	struct wrap_graph *gwrap;
	static const char *kwnames[] = {"cmddef", "doc", NULL};

	gwrap = (struct wrap_graph *)typeobj_graph.tp_alloc(&typeobj_graph, 0);
	if (!gwrap)
		return NULL;

	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s|s", (char **)kwnames,
					 &def, &doc))
		return NULL;

	struct graph *graph = graph_new();
	struct cmd_token *token = cmd_token_new(START_TKN, 0, NULL, NULL);
	graph_new_node(graph, token, (void (*)(void *)) & cmd_token_del);

	struct cmd_element cmd = {.string = def, .doc = doc};
	cmd_graph_parse(graph, &cmd);
	cmd_graph_names(graph);

	gwrap->graph = graph;
	gwrap->definition = strdup(def);
	gwrap->nodewrappers = calloc(vector_active(graph->nodes),
				     sizeof(gwrap->nodewrappers[0]));
	return (PyObject *)gwrap;
}

static PyMethodDef clippy_methods[] = {
	{"parse", clippy_parse, METH_VARARGS, "Parse a C file"},
	{NULL, NULL, 0, NULL}};

#if PY_MAJOR_VERSION >= 3
static struct PyModuleDef pymoddef_clippy = {
	PyModuleDef_HEAD_INIT,
	"_clippy",
	NULL, /* docstring */
	-1,
	clippy_methods,
};
#define modcreate() PyModule_Create(&pymoddef_clippy)
#define initret(val) return val;
#else
#define modcreate() Py_InitModule("_clippy", clippy_methods)
#define initret(val)                                                           \
	do {                                                                   \
		if (!val)                                                      \
			Py_FatalError("initialization failure");               \
		return;                                                        \
	} while (0)
#endif

#pragma GCC diagnostic ignored "-Wstrict-aliasing"
PyMODINIT_FUNC command_py_init(void)
{
	PyObject *pymod;

	if (PyType_Ready(&typeobj_graph_node) < 0)
		initret(NULL);
	if (PyType_Ready(&typeobj_graph) < 0)
		initret(NULL);

	pymod = modcreate();
	if (!pymod)
		initret(NULL);

	Py_INCREF(&typeobj_graph_node);
	PyModule_AddObject(pymod, "GraphNode", (PyObject *)&typeobj_graph_node);
	Py_INCREF(&typeobj_graph);
	PyModule_AddObject(pymod, "Graph", (PyObject *)&typeobj_graph);
	initret(pymod);
}
Commit	Line	Data
29ad6f68 DL	1	/*
	2	* clippy (CLI preparator in python) wrapper for FRR command_graph
	3	* Copyright (C) 2016-2017 David Lamparter for NetDEF, Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the Free
	7	* Software Foundation; either version 2 of the License, or (at your option)
	8	* any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along
	16	* with this program; see the file COPYING; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18	*/
	19
	20	/* note: this wrapper is intended to be used as build-time helper. while
	21	* it should be generally correct and proper, there may be the occasional
	22	* memory leak or SEGV for things that haven't been well-tested.
	23	*/
	24
2618a52e DL	25	/* This file is "exempt" from having
	26	#include "config.h"
	27	* as the first include statement because Python.h also does environment
	28	* setup & these trample over each other.
	29	*/
	30
29ad6f68 DL	31	#include <Python.h>
	32	#include "structmember.h"
	33	#include <string.h>
	34	#include <stdlib.h>
	35
	36	#include "command_graph.h"
	37	#include "clippy.h"
	38
	39	struct wrap_graph;
d62a17ae	40	static PyObject graph_to_pyobj(struct wrap_graph graph,
d62a17ae	41	struct graph_node *gn);
29ad6f68 DL	42
	43	/*
	44	* nodes are wrapped as follows:
	45	* - instances can only be acquired from a graph
	46	* - the same node will return the same wrapper object (they're buffered
	47	* through "idx")
	48	* - a reference is held onto the graph
	49	* - fields are copied for easy access with PyMemberDef
	50	*/
	51	struct wrap_graph_node {
	52	PyObject_HEAD
	53
d62a17ae	54	bool allowrepeat;
29ad6f68 DL	55	const char *type;
	56
	57	bool deprecated;
	58	bool hidden;
	59	const char *text;
	60	const char *desc;
	61	const char *varname;
	62	long long min, max;
	63
	64	struct graph_node *node;
	65	struct wrap_graph *wgraph;
	66	size_t idx;
	67	};
	68
	69	/*
	70	* graphs are wrapped as follows:
	71	* - they can only be created by parsing a definition string
	72	* - there's a table here for the wrapped nodes (nodewrappers), indexed
	73	* by "idx" (corresponds to node's position in graph's table of nodes)
	74	* - graphs do NOT hold references to nodes (would be circular)
	75	*/
	76	struct wrap_graph {
	77	PyObject_HEAD
	78
d62a17ae	79	char *definition;
29ad6f68 DL	80	struct graph *graph;
	81	struct wrap_graph_node **nodewrappers;
	82	};
	83
	84	static PyObject refuse_new(PyTypeObject type, PyObject args, PyObject kwds)
	85	{
d62a17ae	86	PyErr_SetString(PyExc_ValueError,
d62a17ae	87	"cannot create instances of this type");
29ad6f68 DL	88	return NULL;
	89	}
	90
d62a17ae	91	#define member(name, type) \
	92	{ \
	93	(char *)#name, type, offsetof(struct wrap_graph_node, name), \
	94	READONLY, (char *)#name " (" #type ")" \
	95	}
29ad6f68	96	static PyMemberDef members_graph_node[] = {
d62a17ae	97	member(allowrepeat, T_BOOL), member(type, T_STRING),
	98	member(deprecated, T_BOOL), member(hidden, T_BOOL),
	99	member(text, T_STRING), member(desc, T_STRING),
	100	member(min, T_LONGLONG), member(max, T_LONGLONG),
3e300703	101	member(varname, T_STRING), {},
29ad6f68 DL	102	};
	103	#undef member
	104
	105	/*
	106	* node.next() -- returns list of all "next" nodes.
	107	* this will include circles if the graph has them.
	108	*/
	109	static PyObject graph_node_next(PyObject self, PyObject *args)
	110	{
	111	struct wrap_graph_node wrap = (struct wrap_graph_node )self;
	112	PyObject *pylist;
	113
	114	if (wrap->node->data
d62a17ae	115	&& ((struct cmd_token *)wrap->node->data)->type == END_TKN)
29ad6f68 DL	116	return PyList_New(0);
	117	pylist = PyList_New(vector_active(wrap->node->to));
	118	for (size_t i = 0; i < vector_active(wrap->node->to); i++) {
	119	struct graph_node *gn = vector_slot(wrap->node->to, i);
	120	PyList_SetItem(pylist, i, graph_to_pyobj(wrap->wgraph, gn));
	121	}
	122	return pylist;
	123	};
	124
	125	/*
	126	* node.join() -- return FORK's JOIN node or None
	127	*/
	128	static PyObject graph_node_join(PyObject self, PyObject *args)
	129	{
	130	struct wrap_graph_node wrap = (struct wrap_graph_node )self;
	131
	132	if (!wrap->node->data
d62a17ae	133	\|\| ((struct cmd_token *)wrap->node->data)->type == END_TKN)
29ad6f68 DL	134	Py_RETURN_NONE;
	135
	136	struct cmd_token *tok = wrap->node->data;
	137	if (tok->type != FORK_TKN)
	138	Py_RETURN_NONE;
	139
	140	return graph_to_pyobj(wrap->wgraph, tok->forkjoin);
	141	};
	142
	143	static PyMethodDef methods_graph_node[] = {
	144	{"next", graph_node_next, METH_NOARGS, "outbound graph edge list"},
	145	{"join", graph_node_join, METH_NOARGS, "outbound join node"},
3e300703	146	{}};
29ad6f68 DL	147
	148	static void graph_node_wrap_free(void *arg)
	149	{
	150	struct wrap_graph_node *wrap = arg;
	151	wrap->wgraph->nodewrappers[wrap->idx] = NULL;
	152	Py_DECREF(wrap->wgraph);
	153	}
	154
	155	static PyTypeObject typeobj_graph_node = {
d62a17ae	156	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.GraphNode",
	157	.tp_basicsize = sizeof(struct wrap_graph_node),
	158	.tp_flags = Py_TPFLAGS_DEFAULT,
	159	.tp_doc = "struct graph_node *",
	160	.tp_new = refuse_new,
	161	.tp_free = graph_node_wrap_free,
	162	.tp_members = members_graph_node,
	163	.tp_methods = methods_graph_node,
29ad6f68 DL	164	};
29ad6f68 DL	165
d62a17ae	166	static PyObject graph_to_pyobj(struct wrap_graph wgraph,
d62a17ae	167	struct graph_node *gn)
29ad6f68 DL	168	{
	169	struct wrap_graph_node *wrap;
	170	size_t i;
	171
	172	for (i = 0; i < vector_active(wgraph->graph->nodes); i++)
	173	if (vector_slot(wgraph->graph->nodes, i) == gn)
	174	break;
	175	if (i == vector_active(wgraph->graph->nodes)) {
	176	PyErr_SetString(PyExc_ValueError, "cannot find node in graph");
	177	return NULL;
	178	}
	179	if (wgraph->nodewrappers[i]) {
	180	PyObject obj = (PyObject )wgraph->nodewrappers[i];
	181	Py_INCREF(obj);
	182	return obj;
	183	}
	184
d62a17ae	185	wrap = (struct wrap_graph_node *)typeobj_graph_node.tp_alloc(
d62a17ae	186	&typeobj_graph_node, 0);
29ad6f68 DL	187	if (!wrap)
	188	return NULL;
	189	wgraph->nodewrappers[i] = wrap;
	190	Py_INCREF(wgraph);
	191
	192	wrap->idx = i;
	193	wrap->wgraph = wgraph;
	194	wrap->node = gn;
	195	wrap->type = "NULL";
	196	wrap->allowrepeat = false;
	197	if (gn->data) {
	198	struct cmd_token *tok = gn->data;
	199	switch (tok->type) {
	200	#define item(x) case x: wrap->type = #x; break;
d62a17ae	201	item(WORD_TKN) // words
	202	item(VARIABLE_TKN) // almost anything
	203	item(RANGE_TKN) // integer range
	204	item(IPV4_TKN) // IPV4 addresses
	205	item(IPV4_PREFIX_TKN) // IPV4 network prefixes
	206	item(IPV6_TKN) // IPV6 prefixes
	207	item(IPV6_PREFIX_TKN) // IPV6 network prefixes
473196f6 QY	208	item(MAC_TKN) // MAC address
473196f6 QY	209	item(MAC_PREFIX_TKN) // MAC address with mask
d62a17ae	210
	211	/* plumbing types */
	212	item(FORK_TKN) item(JOIN_TKN) item(START_TKN)
	213	item(END_TKN) default
9d303b37	214	: wrap->type = "???";
29ad6f68 DL	215	}
	216
	217	wrap->deprecated = (tok->attr == CMD_ATTR_DEPRECATED);
	218	wrap->hidden = (tok->attr == CMD_ATTR_HIDDEN);
	219	wrap->text = tok->text;
	220	wrap->desc = tok->desc;
	221	wrap->varname = tok->varname;
	222	wrap->min = tok->min;
	223	wrap->max = tok->max;
	224	wrap->allowrepeat = tok->allowrepeat;
	225	}
	226
	227	return (PyObject *)wrap;
	228	}
	229
d62a17ae	230	#define member(name, type) \
	231	{ \
	232	(char *)#name, type, offsetof(struct wrap_graph, name), \
	233	READONLY, (char *)#name " (" #type ")" \
	234	}
29ad6f68 DL	235	static PyMemberDef members_graph[] = {
29ad6f68 DL	236	member(definition, T_STRING),
3e300703	237	{},
29ad6f68 DL	238	};
	239	#undef member
	240
	241	/* graph.first() - root node */
	242	static PyObject graph_first(PyObject self, PyObject *args)
	243	{
	244	struct wrap_graph gwrap = (struct wrap_graph )self;
	245	struct graph_node *gn = vector_slot(gwrap->graph->nodes, 0);
	246	return graph_to_pyobj(gwrap, gn);
	247	};
	248
	249	static PyMethodDef methods_graph[] = {
	250	{"first", graph_first, METH_NOARGS, "first graph node"},
3e300703	251	{}};
29ad6f68	252
d62a17ae	253	static PyObject graph_parse(PyTypeObject type, PyObject *args,
d62a17ae	254	PyObject *kwds);
29ad6f68 DL	255
	256	static void graph_wrap_free(void *arg)
	257	{
	258	struct wrap_graph *wgraph = arg;
e871b669 DS	259
e871b669 DS	260	graph_delete_graph(wgraph->graph);
29ad6f68 DL	261	free(wgraph->nodewrappers);
	262	free(wgraph->definition);
	263	}
	264
	265	static PyTypeObject typeobj_graph = {
d62a17ae	266	PyVarObject_HEAD_INIT(NULL, 0).tp_name = "_clippy.Graph",
	267	.tp_basicsize = sizeof(struct wrap_graph),
	268	.tp_flags = Py_TPFLAGS_DEFAULT,
	269	.tp_doc = "struct graph *",
	270	.tp_new = graph_parse,
	271	.tp_free = graph_wrap_free,
	272	.tp_members = members_graph,
	273	.tp_methods = methods_graph,
29ad6f68 DL	274	};
	275
	276	/* top call / entrypoint for python code */
	277	static PyObject graph_parse(PyTypeObject type, PyObject args, PyObject kwds)
	278	{
	279	const char def, doc = NULL;
	280	struct wrap_graph *gwrap;
d62a17ae	281	static const char *kwnames[] = {"cmddef", "doc", NULL};
29ad6f68 DL	282
	283	gwrap = (struct wrap_graph *)typeobj_graph.tp_alloc(&typeobj_graph, 0);
	284	if (!gwrap)
	285	return NULL;
	286
d62a17ae	287	if (!PyArg_ParseTupleAndKeywords(args, kwds, "s\|s", (char **)kwnames,
d62a17ae	288	&def, &doc))
29ad6f68 DL	289	return NULL;
29ad6f68 DL	290
d62a17ae	291	struct graph *graph = graph_new();
	292	struct cmd_token *token = cmd_token_new(START_TKN, 0, NULL, NULL);
	293	graph_new_node(graph, token, (void ()(void )) & cmd_token_del);
29ad6f68	294
d62a17ae	295	struct cmd_element cmd = {.string = def, .doc = doc};
	296	cmd_graph_parse(graph, &cmd);
	297	cmd_graph_names(graph);
29ad6f68 DL	298
	299	gwrap->graph = graph;
	300	gwrap->definition = strdup(def);
	301	gwrap->nodewrappers = calloc(vector_active(graph->nodes),
d62a17ae	302	sizeof(gwrap->nodewrappers[0]));
29ad6f68 DL	303	return (PyObject *)gwrap;
	304	}
	305
	306	static PyMethodDef clippy_methods[] = {
	307	{"parse", clippy_parse, METH_VARARGS, "Parse a C file"},
d62a17ae	308	{NULL, NULL, 0, NULL}};
29ad6f68 DL	309
	310	#if PY_MAJOR_VERSION >= 3
	311	static struct PyModuleDef pymoddef_clippy = {
	312	PyModuleDef_HEAD_INIT,
	313	"_clippy",
	314	NULL, /* docstring */
	315	-1,
	316	clippy_methods,
	317	};
	318	#define modcreate() PyModule_Create(&pymoddef_clippy)
	319	#define initret(val) return val;
	320	#else
	321	#define modcreate() Py_InitModule("_clippy", clippy_methods)
d62a17ae	322	#define initret(val) \
	323	do { \
	324	if (!val) \
	325	Py_FatalError("initialization failure"); \
	326	return; \
	327	} while (0)
29ad6f68 DL	328	#endif
29ad6f68 DL	329
f54dd468	330	#pragma GCC diagnostic ignored "-Wstrict-aliasing"
29ad6f68 DL	331	PyMODINIT_FUNC command_py_init(void)
29ad6f68 DL	332	{
d62a17ae	333	PyObject *pymod;
29ad6f68 DL	334
	335	if (PyType_Ready(&typeobj_graph_node) < 0)
	336	initret(NULL);
	337	if (PyType_Ready(&typeobj_graph) < 0)
	338	initret(NULL);
	339
	340	pymod = modcreate();
	341	if (!pymod)
	342	initret(NULL);
	343
	344	Py_INCREF(&typeobj_graph_node);
	345	PyModule_AddObject(pymod, "GraphNode", (PyObject *)&typeobj_graph_node);
	346	Py_INCREF(&typeobj_graph);
	347	PyModule_AddObject(pymod, "Graph", (PyObject *)&typeobj_graph);
	348	initret(pymod);
	349	}