mercurial/dirs.c
author Yuya Nishihara <yuya@tcha.org>
Sat, 27 Sep 2014 22:39:01 +0900
changeset 22991 a94594f5d52f
parent 21809 e250b8300e6e
child 23960 bca4b6f126f2
permissions -rw-r--r--
test-commandserver: remove unused repopath argument from check() Instead of repopath, check() will receive connect() function as argument. It will allow to connect to server of different mode.
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/*
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 dirs.c - dynamic directory diddling for dirstates
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 Copyright 2013 Facebook
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 This software may be used and distributed according to the terms of
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 the GNU General Public License, incorporated herein by reference.
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*/
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#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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#include "util.h"
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/*
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 * This is a multiset of directory names, built from the files that
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 * appear in a dirstate or manifest.
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 *
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 * A few implementation notes:
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 *
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 * We modify Python integers for refcounting, but those integers are
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 * never visible to Python code.
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 *
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 * We mutate strings in-place, but leave them immutable once they can
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 * be seen by Python code.
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 */
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typedef struct {
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	PyObject_HEAD
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	PyObject *dict;
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} dirsObject;
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static inline Py_ssize_t _finddir(PyObject *path, Py_ssize_t pos)
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{
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	const char *s = PyString_AS_STRING(path);
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	while (pos != -1) {
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		if (s[pos] == '/')
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			break;
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		pos -= 1;
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	}
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	return pos;
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}
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static int _addpath(PyObject *dirs, PyObject *path)
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{
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	const char *cpath = PyString_AS_STRING(path);
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	Py_ssize_t pos = PyString_GET_SIZE(path);
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	PyObject *key = NULL;
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	int ret = -1;
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	while ((pos = _finddir(path, pos - 1)) != -1) {
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		PyObject *val;
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		/* It's likely that every prefix already has an entry
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		   in our dict. Try to avoid allocating and
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		   deallocating a string for each prefix we check. */
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		if (key != NULL)
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			((PyStringObject *)key)->ob_shash = -1;
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		else {
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			/* Force Python to not reuse a small shared string. */
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			key = PyString_FromStringAndSize(cpath,
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							 pos < 2 ? 2 : pos);
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			if (key == NULL)
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				goto bail;
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		}
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		PyString_GET_SIZE(key) = pos;
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		PyString_AS_STRING(key)[pos] = '\0';
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		val = PyDict_GetItem(dirs, key);
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		if (val != NULL) {
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			PyInt_AS_LONG(val) += 1;
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			continue;
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		}
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		/* Force Python to not reuse a small shared int. */
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		val = PyInt_FromLong(0x1eadbeef);
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		if (val == NULL)
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			goto bail;
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		PyInt_AS_LONG(val) = 1;
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		ret = PyDict_SetItem(dirs, key, val);
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		Py_DECREF(val);
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		if (ret == -1)
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			goto bail;
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		Py_CLEAR(key);
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	}
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	ret = 0;
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bail:
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	Py_XDECREF(key);
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	return ret;
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}
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static int _delpath(PyObject *dirs, PyObject *path)
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{
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	Py_ssize_t pos = PyString_GET_SIZE(path);
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	PyObject *key = NULL;
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	int ret = -1;
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	while ((pos = _finddir(path, pos - 1)) != -1) {
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		PyObject *val;
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		key = PyString_FromStringAndSize(PyString_AS_STRING(path), pos);
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		if (key == NULL)
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			goto bail;
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		val = PyDict_GetItem(dirs, key);
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		if (val == NULL) {
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			PyErr_SetString(PyExc_ValueError,
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					"expected a value, found none");
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			goto bail;
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		}
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		if (--PyInt_AS_LONG(val) <= 0 &&
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		    PyDict_DelItem(dirs, key) == -1)
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			goto bail;
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		Py_CLEAR(key);
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	}
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	ret = 0;
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bail:
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	Py_XDECREF(key);
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	return ret;
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}
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static int dirs_fromdict(PyObject *dirs, PyObject *source, char skipchar)
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{
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	PyObject *key, *value;
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	Py_ssize_t pos = 0;
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	while (PyDict_Next(source, &pos, &key, &value)) {
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		if (!PyString_Check(key)) {
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			PyErr_SetString(PyExc_TypeError, "expected string key");
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			return -1;
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		}
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		if (skipchar) {
21809
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			if (!dirstate_tuple_check(value)) {
18900
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				PyErr_SetString(PyExc_TypeError,
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						"expected a dirstate tuple");
18900
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				return -1;
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			}
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			if (((dirstateTupleObject *)value)->state == skipchar)
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				continue;
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		}
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		if (_addpath(dirs, key) == -1)
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			return -1;
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	}
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	return 0;
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}
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static int dirs_fromiter(PyObject *dirs, PyObject *source)
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{
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	PyObject *iter, *item = NULL;
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	int ret;
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	iter = PyObject_GetIter(source);
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	if (iter == NULL)
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		return -1;
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	while ((item = PyIter_Next(iter)) != NULL) {
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		if (!PyString_Check(item)) {
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			PyErr_SetString(PyExc_TypeError, "expected string");
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			break;
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		}
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		if (_addpath(dirs, item) == -1)
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			break;
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		Py_CLEAR(item);
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	}
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	ret = PyErr_Occurred() ? -1 : 0;
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	Py_XDECREF(item);
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	return ret;
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}
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/*
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 * Calculate a refcounted set of directory names for the files in a
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 * dirstate.
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 */
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static int dirs_init(dirsObject *self, PyObject *args)
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{
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	PyObject *dirs = NULL, *source = NULL;
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	char skipchar = 0;
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	int ret = -1;
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	self->dict = NULL;
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	if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar))
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		return -1;
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	dirs = PyDict_New();
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	if (dirs == NULL)
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		return -1;
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	if (source == NULL)
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		ret = 0;
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	else if (PyDict_Check(source))
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		ret = dirs_fromdict(dirs, source, skipchar);
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	else if (skipchar)
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		PyErr_SetString(PyExc_ValueError,
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				"skip character is only supported "
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				"with a dict source");
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	else
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		ret = dirs_fromiter(dirs, source);
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	if (ret == -1)
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		Py_XDECREF(dirs);
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	else
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		self->dict = dirs;
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	return ret;
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}
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PyObject *dirs_addpath(dirsObject *self, PyObject *args)
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{
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	PyObject *path;
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	if (!PyArg_ParseTuple(args, "O!:addpath", &PyString_Type, &path))
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		return NULL;
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   227
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	if (_addpath(self->dict, path) == -1)
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		return NULL;
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	Py_RETURN_NONE;
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}
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static PyObject *dirs_delpath(dirsObject *self, PyObject *args)
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{
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	PyObject *path;
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	if (!PyArg_ParseTuple(args, "O!:delpath", &PyString_Type, &path))
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		return NULL;
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	if (_delpath(self->dict, path) == -1)
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		return NULL;
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   243
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	Py_RETURN_NONE;
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}
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   246
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static int dirs_contains(dirsObject *self, PyObject *value)
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{
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	return PyString_Check(value) ? PyDict_Contains(self->dict, value) : 0;
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}
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   251
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static void dirs_dealloc(dirsObject *self)
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{
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	Py_XDECREF(self->dict);
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	PyObject_Del(self);
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   256
}
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   257
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static PyObject *dirs_iter(dirsObject *self)
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{
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	return PyObject_GetIter(self->dict);
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}
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static PySequenceMethods dirs_sequence_methods;
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   264
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static PyMethodDef dirs_methods[] = {
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	{"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"},
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	{"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"},
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	{NULL} /* Sentinel */
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};
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static PyTypeObject dirsType = { PyObject_HEAD_INIT(NULL) };
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void dirs_module_init(PyObject *mod)
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{
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	dirs_sequence_methods.sq_contains = (objobjproc)dirs_contains;
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	dirsType.tp_name = "parsers.dirs";
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	dirsType.tp_new = PyType_GenericNew;
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	dirsType.tp_basicsize = sizeof(dirsObject);
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	dirsType.tp_dealloc = (destructor)dirs_dealloc;
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	dirsType.tp_as_sequence = &dirs_sequence_methods;
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	dirsType.tp_flags = Py_TPFLAGS_DEFAULT;
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	dirsType.tp_doc = "dirs";
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	dirsType.tp_iter = (getiterfunc)dirs_iter;
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	dirsType.tp_methods = dirs_methods;
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	dirsType.tp_init = (initproc)dirs_init;
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	if (PyType_Ready(&dirsType) < 0)
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		return;
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	Py_INCREF(&dirsType);
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	PyModule_AddObject(mod, "dirs", (PyObject *)&dirsType);
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}