Mercurial > hg
annotate mercurial/dirs.c @ 28359:f6b5b041c6c9
commit: block amend while histedit is in progress (issue4800)
author | timeless <timeless@mozdev.org> |
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date | Sun, 14 Feb 2016 07:35:50 +0000 |
parents | fe3a72a3e7ca |
children | 63e1dca2d6a4 |
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(const char *path, Py_ssize_t pos) |
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32 { |
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33 while (pos != -1) { |
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34 if (path[pos] == '/') |
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35 break; |
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36 pos -= 1; |
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37 } |
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38 |
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39 return pos; |
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40 } |
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41 |
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42 static int _addpath(PyObject *dirs, PyObject *path) |
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43 { |
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44 const char *cpath = PyString_AS_STRING(path); |
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45 Py_ssize_t pos = PyString_GET_SIZE(path); |
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46 PyObject *key = NULL; |
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47 int ret = -1; |
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48 |
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49 while ((pos = _finddir(cpath, pos - 1)) != -1) { |
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50 PyObject *val; |
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51 |
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52 /* It's likely that every prefix already has an entry |
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53 in our dict. Try to avoid allocating and |
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54 deallocating a string for each prefix we check. */ |
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55 if (key != NULL) |
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56 ((PyStringObject *)key)->ob_shash = -1; |
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57 else { |
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58 /* Force Python to not reuse a small shared string. */ |
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59 key = PyString_FromStringAndSize(cpath, |
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60 pos < 2 ? 2 : pos); |
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61 if (key == NULL) |
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62 goto bail; |
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63 } |
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64 PyString_GET_SIZE(key) = pos; |
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65 PyString_AS_STRING(key)[pos] = '\0'; |
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66 |
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67 val = PyDict_GetItem(dirs, key); |
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68 if (val != NULL) { |
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69 PyInt_AS_LONG(val) += 1; |
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70 break; |
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71 } |
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72 |
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73 /* Force Python to not reuse a small shared int. */ |
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74 val = PyInt_FromLong(0x1eadbeef); |
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75 |
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76 if (val == NULL) |
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77 goto bail; |
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78 |
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79 PyInt_AS_LONG(val) = 1; |
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80 ret = PyDict_SetItem(dirs, key, val); |
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81 Py_DECREF(val); |
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82 if (ret == -1) |
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83 goto bail; |
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84 Py_CLEAR(key); |
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85 } |
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86 ret = 0; |
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87 |
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88 bail: |
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89 Py_XDECREF(key); |
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90 |
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91 return ret; |
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92 } |
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93 |
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94 static int _delpath(PyObject *dirs, PyObject *path) |
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95 { |
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96 char *cpath = PyString_AS_STRING(path); |
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97 Py_ssize_t pos = PyString_GET_SIZE(path); |
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98 PyObject *key = NULL; |
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99 int ret = -1; |
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100 |
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101 while ((pos = _finddir(cpath, pos - 1)) != -1) { |
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102 PyObject *val; |
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103 |
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104 key = PyString_FromStringAndSize(cpath, pos); |
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105 |
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106 if (key == NULL) |
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107 goto bail; |
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108 |
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109 val = PyDict_GetItem(dirs, key); |
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110 if (val == NULL) { |
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111 PyErr_SetString(PyExc_ValueError, |
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112 "expected a value, found none"); |
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113 goto bail; |
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114 } |
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115 |
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116 if (--PyInt_AS_LONG(val) <= 0) { |
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117 if (PyDict_DelItem(dirs, key) == -1) |
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118 goto bail; |
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119 } else |
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120 break; |
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121 Py_CLEAR(key); |
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122 } |
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123 ret = 0; |
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124 |
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125 bail: |
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126 Py_XDECREF(key); |
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127 |
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128 return ret; |
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129 } |
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130 |
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131 static int dirs_fromdict(PyObject *dirs, PyObject *source, char skipchar) |
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132 { |
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133 PyObject *key, *value; |
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134 Py_ssize_t pos = 0; |
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135 |
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136 while (PyDict_Next(source, &pos, &key, &value)) { |
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137 if (!PyString_Check(key)) { |
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138 PyErr_SetString(PyExc_TypeError, "expected string key"); |
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139 return -1; |
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140 } |
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141 if (skipchar) { |
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142 if (!dirstate_tuple_check(value)) { |
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143 PyErr_SetString(PyExc_TypeError, |
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144 "expected a dirstate tuple"); |
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145 return -1; |
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146 } |
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147 if (((dirstateTupleObject *)value)->state == skipchar) |
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148 continue; |
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149 } |
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150 |
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151 if (_addpath(dirs, key) == -1) |
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152 return -1; |
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153 } |
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154 |
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155 return 0; |
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156 } |
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157 |
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158 static int dirs_fromiter(PyObject *dirs, PyObject *source) |
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159 { |
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160 PyObject *iter, *item = NULL; |
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161 int ret; |
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162 |
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163 iter = PyObject_GetIter(source); |
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164 if (iter == NULL) |
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165 return -1; |
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166 |
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167 while ((item = PyIter_Next(iter)) != NULL) { |
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168 if (!PyString_Check(item)) { |
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169 PyErr_SetString(PyExc_TypeError, "expected string"); |
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170 break; |
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171 } |
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172 |
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173 if (_addpath(dirs, item) == -1) |
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174 break; |
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175 Py_CLEAR(item); |
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176 } |
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177 |
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178 ret = PyErr_Occurred() ? -1 : 0; |
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179 Py_DECREF(iter); |
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180 Py_XDECREF(item); |
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181 return ret; |
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182 } |
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183 |
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184 /* |
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185 * Calculate a refcounted set of directory names for the files in a |
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186 * dirstate. |
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187 */ |
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188 static int dirs_init(dirsObject *self, PyObject *args) |
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189 { |
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190 PyObject *dirs = NULL, *source = NULL; |
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191 char skipchar = 0; |
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192 int ret = -1; |
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193 |
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194 self->dict = NULL; |
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195 |
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196 if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar)) |
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197 return -1; |
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198 |
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199 dirs = PyDict_New(); |
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200 |
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201 if (dirs == NULL) |
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202 return -1; |
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203 |
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204 if (source == NULL) |
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205 ret = 0; |
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206 else if (PyDict_Check(source)) |
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207 ret = dirs_fromdict(dirs, source, skipchar); |
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208 else if (skipchar) |
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209 PyErr_SetString(PyExc_ValueError, |
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210 "skip character is only supported " |
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211 "with a dict source"); |
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212 else |
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213 ret = dirs_fromiter(dirs, source); |
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214 |
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215 if (ret == -1) |
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216 Py_XDECREF(dirs); |
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217 else |
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218 self->dict = dirs; |
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219 |
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220 return ret; |
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221 } |
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222 |
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223 PyObject *dirs_addpath(dirsObject *self, PyObject *args) |
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224 { |
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225 PyObject *path; |
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226 |
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227 if (!PyArg_ParseTuple(args, "O!:addpath", &PyString_Type, &path)) |
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228 return NULL; |
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229 |
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230 if (_addpath(self->dict, path) == -1) |
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231 return NULL; |
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232 |
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233 Py_RETURN_NONE; |
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234 } |
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235 |
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236 static PyObject *dirs_delpath(dirsObject *self, PyObject *args) |
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237 { |
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238 PyObject *path; |
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239 |
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240 if (!PyArg_ParseTuple(args, "O!:delpath", &PyString_Type, &path)) |
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241 return NULL; |
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242 |
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243 if (_delpath(self->dict, path) == -1) |
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244 return NULL; |
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245 |
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246 Py_RETURN_NONE; |
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247 } |
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248 |
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249 static int dirs_contains(dirsObject *self, PyObject *value) |
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250 { |
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251 return PyString_Check(value) ? PyDict_Contains(self->dict, value) : 0; |
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252 } |
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253 |
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254 static void dirs_dealloc(dirsObject *self) |
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255 { |
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256 Py_XDECREF(self->dict); |
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257 PyObject_Del(self); |
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258 } |
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259 |
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260 static PyObject *dirs_iter(dirsObject *self) |
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261 { |
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262 return PyObject_GetIter(self->dict); |
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263 } |
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264 |
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265 static PySequenceMethods dirs_sequence_methods; |
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266 |
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267 static PyMethodDef dirs_methods[] = { |
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268 {"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"}, |
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269 {"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"}, |
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270 {NULL} /* Sentinel */ |
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271 }; |
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272 |
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273 static PyTypeObject dirsType = { PyObject_HEAD_INIT(NULL) }; |
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274 |
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275 void dirs_module_init(PyObject *mod) |
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276 { |
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277 dirs_sequence_methods.sq_contains = (objobjproc)dirs_contains; |
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278 dirsType.tp_name = "parsers.dirs"; |
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279 dirsType.tp_new = PyType_GenericNew; |
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280 dirsType.tp_basicsize = sizeof(dirsObject); |
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281 dirsType.tp_dealloc = (destructor)dirs_dealloc; |
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282 dirsType.tp_as_sequence = &dirs_sequence_methods; |
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283 dirsType.tp_flags = Py_TPFLAGS_DEFAULT; |
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284 dirsType.tp_doc = "dirs"; |
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285 dirsType.tp_iter = (getiterfunc)dirs_iter; |
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286 dirsType.tp_methods = dirs_methods; |
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287 dirsType.tp_init = (initproc)dirs_init; |
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288 |
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289 if (PyType_Ready(&dirsType) < 0) |
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290 return; |
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291 Py_INCREF(&dirsType); |
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292 |
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293 PyModule_AddObject(mod, "dirs", (PyObject *)&dirsType); |
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294 } |