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annotate mercurial/dirs.c @ 20885:f49d60fa40a5

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fncache: clean up fncache during strips Previously the fncache was cleaned up at read time by noticing when it was out of sync. This caused writes to happen outside the scope of transactions and could have caused race conditions. With this change, we'll keep the fncache up-to-date as we go by removing old entries during repair.strip.
author Durham Goode <durham@fb.com>
date Mon, 24 Mar 2014 15:43:15 -0700
parents 8c0a7eeda06d
children e250b8300e6e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 dirs.c - dynamic directory diddling for dirstates
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3
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4 Copyright 2013 Facebook
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5
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6 This software may be used and distributed according to the terms of
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7 the GNU General Public License, incorporated herein by reference.
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8 */
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9
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10 #define PY_SSIZE_T_CLEAN
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11 #include <Python.h>
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12 #include "util.h"
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13
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14 /*
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15 * This is a multiset of directory names, built from the files that
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16 * appear in a dirstate or manifest.
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17 *
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18 * A few implementation notes:
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19 *
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20 * We modify Python integers for refcounting, but those integers are
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21 * never visible to Python code.
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22 *
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23 * We mutate strings in-place, but leave them immutable once they can
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24 * be seen by Python code.
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25 */
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26 typedef struct {
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27 PyObject_HEAD
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28 PyObject *dict;
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29 } dirsObject;
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30
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31 static inline Py_ssize_t _finddir(PyObject *path, Py_ssize_t pos)
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32 {
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33 const char *s = PyString_AS_STRING(path);
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34
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35 while (pos != -1) {
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36 if (s[pos] == '/')
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37 break;
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38 pos -= 1;
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39 }
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40
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41 return pos;
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42 }
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43
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44 static int _addpath(PyObject *dirs, PyObject *path)
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45 {
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46 const char *cpath = PyString_AS_STRING(path);
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47 Py_ssize_t pos = PyString_GET_SIZE(path);
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48 PyObject *key = NULL;
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49 int ret = -1;
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50
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51 while ((pos = _finddir(path, pos - 1)) != -1) {
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52 PyObject *val;
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53
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54 /* It's likely that every prefix already has an entry
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55 in our dict. Try to avoid allocating and
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56 deallocating a string for each prefix we check. */
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57 if (key != NULL)
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58 ((PyStringObject *)key)->ob_shash = -1;
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59 else {
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60 /* Force Python to not reuse a small shared string. */
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61 key = PyString_FromStringAndSize(cpath,
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62 pos < 2 ? 2 : pos);
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63 if (key == NULL)
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64 goto bail;
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65 }
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66 PyString_GET_SIZE(key) = pos;
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67 PyString_AS_STRING(key)[pos] = '\0';
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68
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69 val = PyDict_GetItem(dirs, key);
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70 if (val != NULL) {
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71 PyInt_AS_LONG(val) += 1;
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72 continue;
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73 }
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74
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75 /* Force Python to not reuse a small shared int. */
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76 val = PyInt_FromLong(0x1eadbeef);
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77
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78 if (val == NULL)
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79 goto bail;
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80
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81 PyInt_AS_LONG(val) = 1;
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82 ret = PyDict_SetItem(dirs, key, val);
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83 Py_DECREF(val);
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84 if (ret == -1)
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85 goto bail;
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86 Py_CLEAR(key);
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87 }
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88 ret = 0;
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89
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90 bail:
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91 Py_XDECREF(key);
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92
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93 return ret;
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94 }
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95
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96 static int _delpath(PyObject *dirs, PyObject *path)
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97 {
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98 Py_ssize_t pos = PyString_GET_SIZE(path);
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99 PyObject *key = NULL;
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100 int ret = -1;
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101
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102 while ((pos = _finddir(path, pos - 1)) != -1) {
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103 PyObject *val;
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104
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105 key = PyString_FromStringAndSize(PyString_AS_STRING(path), pos);
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106
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107 if (key == NULL)
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108 goto bail;
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109
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110 val = PyDict_GetItem(dirs, key);
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111 if (val == NULL) {
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112 PyErr_SetString(PyExc_ValueError,
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113 "expected a value, found none");
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114 goto bail;
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115 }
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116
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117 if (--PyInt_AS_LONG(val) <= 0 &&
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118 PyDict_DelItem(dirs, key) == -1)
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119 goto bail;
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120 Py_CLEAR(key);
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121 }
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122 ret = 0;
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123
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124 bail:
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125 Py_XDECREF(key);
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126
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127 return ret;
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128 }
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129
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130 static int dirs_fromdict(PyObject *dirs, PyObject *source, char skipchar)
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131 {
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132 PyObject *key, *value;
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133 Py_ssize_t pos = 0;
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134
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135 while (PyDict_Next(source, &pos, &key, &value)) {
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136 if (!PyString_Check(key)) {
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137 PyErr_SetString(PyExc_TypeError, "expected string key");
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138 return -1;
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139 }
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140 if (skipchar) {
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diff changeset
141 PyObject *st;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
142
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
143 if (!PyTuple_Check(value) ||
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
144 PyTuple_GET_SIZE(value) == 0) {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
145 PyErr_SetString(PyExc_TypeError,
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
146 "expected non-empty tuple");
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
147 return -1;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
148 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
149
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
150 st = PyTuple_GET_ITEM(value, 0);
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
151
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
152 if (!PyString_Check(st) || PyString_GET_SIZE(st) == 0) {
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diff changeset
153 PyErr_SetString(PyExc_TypeError,
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
154 "expected non-empty string "
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
155 "at tuple index 0");
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
156 return -1;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
157 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
158
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
159 if (PyString_AS_STRING(st)[0] == skipchar)
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diff changeset
160 continue;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
161 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
162
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
163 if (_addpath(dirs, key) == -1)
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diff changeset
164 return -1;
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parents:
diff changeset
165 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
166
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diff changeset
167 return 0;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
168 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
169
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diff changeset
170 static int dirs_fromiter(PyObject *dirs, PyObject *source)
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171 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
172 PyObject *iter, *item = NULL;
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diff changeset
173 int ret;
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
174
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diff changeset
175 iter = PyObject_GetIter(source);
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diff changeset
176 if (iter == NULL)
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177 return -1;
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diff changeset
178
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
179 while ((item = PyIter_Next(iter)) != NULL) {
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180 if (!PyString_Check(item)) {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
181 PyErr_SetString(PyExc_TypeError, "expected string");
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diff changeset
182 break;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
183 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
184
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
185 if (_addpath(dirs, item) == -1)
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
186 break;
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
187 Py_CLEAR(item);
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
188 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
189
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
190 ret = PyErr_Occurred() ? -1 : 0;
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
191 Py_XDECREF(item);
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
192 return ret;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
193 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
194
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
195 /*
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196 * Calculate a refcounted set of directory names for the files in a
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diff changeset
197 * dirstate.
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diff changeset
198 */
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diff changeset
199 static int dirs_init(dirsObject *self, PyObject *args)
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diff changeset
200 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
201 PyObject *dirs = NULL, *source = NULL;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
202 char skipchar = 0;
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
203 int ret = -1;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
204
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
205 self->dict = NULL;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
206
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
207 if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar))
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
208 return -1;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
209
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
210 dirs = PyDict_New();
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
211
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
212 if (dirs == NULL)
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
213 return -1;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
214
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
215 if (source == NULL)
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diff changeset
216 ret = 0;
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
217 else if (PyDict_Check(source))
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diff changeset
218 ret = dirs_fromdict(dirs, source, skipchar);
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diff changeset
219 else if (skipchar)
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
220 PyErr_SetString(PyExc_ValueError,
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
221 "skip character is only supported "
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
222 "with a dict source");
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
223 else
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
224 ret = dirs_fromiter(dirs, source);
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
225
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
226 if (ret == -1)
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
227 Py_XDECREF(dirs);
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
228 else
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
229 self->dict = dirs;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
230
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
231 return ret;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
232 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
233
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
234 PyObject *dirs_addpath(dirsObject *self, PyObject *args)
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diff changeset
235 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
236 PyObject *path;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
237
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
238 if (!PyArg_ParseTuple(args, "O!:addpath", &PyString_Type, &path))
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
239 return NULL;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
240
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
241 if (_addpath(self->dict, path) == -1)
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
242 return NULL;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
243
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
244 Py_RETURN_NONE;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
245 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
246
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
247 static PyObject *dirs_delpath(dirsObject *self, PyObject *args)
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
248 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
249 PyObject *path;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
250
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
251 if (!PyArg_ParseTuple(args, "O!:delpath", &PyString_Type, &path))
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
252 return NULL;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
253
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
254 if (_delpath(self->dict, path) == -1)
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
255 return NULL;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
256
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
257 Py_RETURN_NONE;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
258 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
259
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
260 static int dirs_contains(dirsObject *self, PyObject *value)
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parents:
diff changeset
261 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
262 return PyString_Check(value) ? PyDict_Contains(self->dict, value) : 0;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
263 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
264
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
265 static void dirs_dealloc(dirsObject *self)
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
266 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
267 Py_XDECREF(self->dict);
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
268 PyObject_Del(self);
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
269 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
270
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
271 static PyObject *dirs_iter(dirsObject *self)
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
272 {
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
273 return PyObject_GetIter(self->dict);
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
274 }
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
275
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
276 static PySequenceMethods dirs_sequence_methods;
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
277
02ee846b246a scmutil: rewrite dirs in C, use if available
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diff changeset
278 static PyMethodDef dirs_methods[] = {
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
279 {"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"},
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
280 {"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"},
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
281 {NULL} /* Sentinel */
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
282 };
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
283
02ee846b246a scmutil: rewrite dirs in C, use if available
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parents:
diff changeset
284 static PyTypeObject dirsType = { PyObject_HEAD_INIT(NULL) };
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parents:
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285
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286 void dirs_module_init(PyObject *mod)
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287 {
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288 dirs_sequence_methods.sq_contains = (objobjproc)dirs_contains;
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289 dirsType.tp_name = "parsers.dirs";
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290 dirsType.tp_new = PyType_GenericNew;
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291 dirsType.tp_basicsize = sizeof(dirsObject);
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292 dirsType.tp_dealloc = (destructor)dirs_dealloc;
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293 dirsType.tp_as_sequence = &dirs_sequence_methods;
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294 dirsType.tp_flags = Py_TPFLAGS_DEFAULT;
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295 dirsType.tp_doc = "dirs";
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296 dirsType.tp_iter = (getiterfunc)dirs_iter;
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297 dirsType.tp_methods = dirs_methods;
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298 dirsType.tp_init = (initproc)dirs_init;
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299
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300 if (PyType_Ready(&dirsType) < 0)
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301 return;
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302 Py_INCREF(&dirsType);
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303
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304 PyModule_AddObject(mod, "dirs", (PyObject *)&dirsType);
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305 }