Mercurial > hg
annotate mercurial/dirs.c @ 19785:1d2ca307bf22
merge with stable
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 23 Sep 2013 13:26:11 -0700 |
parents | 8c0a7eeda06d |
children | e250b8300e6e |
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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141 PyObject *st; |
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142 |
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143 if (!PyTuple_Check(value) || |
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144 PyTuple_GET_SIZE(value) == 0) { |
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145 PyErr_SetString(PyExc_TypeError, |
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146 "expected non-empty tuple"); |
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147 return -1; |
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148 } |
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149 |
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150 st = PyTuple_GET_ITEM(value, 0); |
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151 |
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152 if (!PyString_Check(st) || PyString_GET_SIZE(st) == 0) { |
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153 PyErr_SetString(PyExc_TypeError, |
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154 "expected non-empty string " |
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155 "at tuple index 0"); |
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156 return -1; |
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157 } |
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158 |
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159 if (PyString_AS_STRING(st)[0] == skipchar) |
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160 continue; |
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161 } |
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162 |
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163 if (_addpath(dirs, key) == -1) |
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164 return -1; |
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165 } |
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166 |
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167 return 0; |
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168 } |
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169 |
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170 static int dirs_fromiter(PyObject *dirs, PyObject *source) |
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171 { |
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172 PyObject *iter, *item = NULL; |
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173 int ret; |
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174 |
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175 iter = PyObject_GetIter(source); |
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176 if (iter == NULL) |
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177 return -1; |
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178 |
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179 while ((item = PyIter_Next(iter)) != NULL) { |
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180 if (!PyString_Check(item)) { |
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181 PyErr_SetString(PyExc_TypeError, "expected string"); |
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182 break; |
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183 } |
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184 |
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185 if (_addpath(dirs, item) == -1) |
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186 break; |
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187 Py_CLEAR(item); |
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188 } |
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189 |
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190 ret = PyErr_Occurred() ? -1 : 0; |
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191 Py_XDECREF(item); |
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192 return ret; |
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193 } |
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194 |
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195 /* |
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196 * Calculate a refcounted set of directory names for the files in a |
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197 * dirstate. |
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198 */ |
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199 static int dirs_init(dirsObject *self, PyObject *args) |
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200 { |
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201 PyObject *dirs = NULL, *source = NULL; |
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202 char skipchar = 0; |
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203 int ret = -1; |
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204 |
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205 self->dict = NULL; |
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206 |
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207 if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar)) |
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208 return -1; |
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209 |
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210 dirs = PyDict_New(); |
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211 |
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212 if (dirs == NULL) |
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213 return -1; |
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214 |
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215 if (source == NULL) |
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216 ret = 0; |
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217 else if (PyDict_Check(source)) |
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218 ret = dirs_fromdict(dirs, source, skipchar); |
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219 else if (skipchar) |
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220 PyErr_SetString(PyExc_ValueError, |
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221 "skip character is only supported " |
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222 "with a dict source"); |
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223 else |
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224 ret = dirs_fromiter(dirs, source); |
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225 |
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226 if (ret == -1) |
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227 Py_XDECREF(dirs); |
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228 else |
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229 self->dict = dirs; |
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230 |
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231 return ret; |
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232 } |
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233 |
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234 PyObject *dirs_addpath(dirsObject *self, PyObject *args) |
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235 { |
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236 PyObject *path; |
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237 |
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238 if (!PyArg_ParseTuple(args, "O!:addpath", &PyString_Type, &path)) |
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239 return NULL; |
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240 |
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241 if (_addpath(self->dict, path) == -1) |
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242 return NULL; |
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243 |
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244 Py_RETURN_NONE; |
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245 } |
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246 |
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247 static PyObject *dirs_delpath(dirsObject *self, PyObject *args) |
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248 { |
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249 PyObject *path; |
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250 |
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251 if (!PyArg_ParseTuple(args, "O!:delpath", &PyString_Type, &path)) |
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252 return NULL; |
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253 |
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254 if (_delpath(self->dict, path) == -1) |
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255 return NULL; |
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256 |
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257 Py_RETURN_NONE; |
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258 } |
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259 |
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260 static int dirs_contains(dirsObject *self, PyObject *value) |
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261 { |
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262 return PyString_Check(value) ? PyDict_Contains(self->dict, value) : 0; |
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263 } |
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264 |
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265 static void dirs_dealloc(dirsObject *self) |
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266 { |
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267 Py_XDECREF(self->dict); |
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268 PyObject_Del(self); |
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269 } |
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270 |
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271 static PyObject *dirs_iter(dirsObject *self) |
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272 { |
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273 return PyObject_GetIter(self->dict); |
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274 } |
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275 |
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276 static PySequenceMethods dirs_sequence_methods; |
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277 |
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278 static PyMethodDef dirs_methods[] = { |
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279 {"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"}, |
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280 {"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"}, |
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281 {NULL} /* Sentinel */ |
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282 }; |
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283 |
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284 static PyTypeObject dirsType = { PyObject_HEAD_INIT(NULL) }; |
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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 } |