Mercurial > hg
annotate mercurial/cext/dirs.c @ 40272:a36c5e23c055
rust: iterator bindings to C code
In this changeset, still made of Rust code only,
we expose the Rust iterator for instantiation and
consumption from C code.
The idea is that both the index and index_get_parents()
will be passed from the C extension, hence avoiding a hard
link dependency to parsers.so, so that the crate can
still be built and tested independently.
On the other hand, parsers.so will use the symbols
defined in this changeset.
author | Georges Racinet <gracinet@anybox.fr> |
---|---|
date | Thu, 27 Sep 2018 16:51:36 +0200 |
parents | b90e8da190da |
children | d8e55c0c642c |
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 |
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13 #include "util.h" |
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14 |
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15 #ifdef IS_PY3K |
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16 #define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[1] |
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17 #else |
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18 #define PYLONG_VALUE(o) PyInt_AS_LONG(o) |
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19 #endif |
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20 |
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21 /* |
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22 * This is a multiset of directory names, built from the files that |
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23 * appear in a dirstate or manifest. |
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24 * |
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25 * A few implementation notes: |
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26 * |
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27 * We modify Python integers for refcounting, but those integers are |
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28 * never visible to Python code. |
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29 * |
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30 * We mutate strings in-place, but leave them immutable once they can |
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31 * be seen by Python code. |
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32 */ |
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33 typedef struct { |
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34 PyObject_HEAD |
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35 PyObject *dict; |
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36 } dirsObject; |
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37 |
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38 static inline Py_ssize_t _finddir(const char *path, Py_ssize_t pos) |
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39 { |
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40 while (pos != -1) { |
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41 if (path[pos] == '/') |
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42 break; |
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43 pos -= 1; |
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44 } |
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45 |
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46 return pos; |
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47 } |
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48 |
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49 static int _addpath(PyObject *dirs, PyObject *path) |
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50 { |
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51 const char *cpath = PyBytes_AS_STRING(path); |
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52 Py_ssize_t pos = PyBytes_GET_SIZE(path); |
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53 PyObject *key = NULL; |
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54 int ret = -1; |
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55 |
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56 /* This loop is super critical for performance. That's why we inline |
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57 * access to Python structs instead of going through a supported API. |
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58 * The implementation, therefore, is heavily dependent on CPython |
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59 * implementation details. We also commit violations of the Python |
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60 * "protocol" such as mutating immutable objects. But since we only |
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61 * mutate objects created in this function or in other well-defined |
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62 * locations, the references are known so these violations should go |
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63 * unnoticed. The code for adjusting the length of a PyBytesObject is |
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64 * essentially a minimal version of _PyBytes_Resize. */ |
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65 while ((pos = _finddir(cpath, pos - 1)) != -1) { |
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66 PyObject *val; |
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67 |
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68 /* It's likely that every prefix already has an entry |
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69 in our dict. Try to avoid allocating and |
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70 deallocating a string for each prefix we check. */ |
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71 if (key != NULL) |
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72 ((PyBytesObject *)key)->ob_shash = -1; |
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73 else { |
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74 /* Force Python to not reuse a small shared string. */ |
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75 key = PyBytes_FromStringAndSize(cpath, |
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76 pos < 2 ? 2 : pos); |
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77 if (key == NULL) |
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78 goto bail; |
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79 } |
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80 /* Py_SIZE(o) refers to the ob_size member of the struct. Yes, |
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81 * assigning to what looks like a function seems wrong. */ |
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82 Py_SIZE(key) = pos; |
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83 ((PyBytesObject *)key)->ob_sval[pos] = '\0'; |
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84 |
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85 val = PyDict_GetItem(dirs, key); |
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86 if (val != NULL) { |
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87 PYLONG_VALUE(val) += 1; |
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88 break; |
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89 } |
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90 |
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91 /* Force Python to not reuse a small shared int. */ |
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92 #ifdef IS_PY3K |
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93 val = PyLong_FromLong(0x1eadbeef); |
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94 #else |
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95 val = PyInt_FromLong(0x1eadbeef); |
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96 #endif |
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97 |
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98 if (val == NULL) |
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99 goto bail; |
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100 |
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101 PYLONG_VALUE(val) = 1; |
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102 ret = PyDict_SetItem(dirs, key, val); |
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103 Py_DECREF(val); |
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104 if (ret == -1) |
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105 goto bail; |
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106 Py_CLEAR(key); |
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107 } |
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108 ret = 0; |
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109 |
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110 bail: |
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111 Py_XDECREF(key); |
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112 |
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113 return ret; |
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114 } |
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115 |
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116 static int _delpath(PyObject *dirs, PyObject *path) |
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117 { |
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118 char *cpath = PyBytes_AS_STRING(path); |
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119 Py_ssize_t pos = PyBytes_GET_SIZE(path); |
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120 PyObject *key = NULL; |
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121 int ret = -1; |
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122 |
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123 while ((pos = _finddir(cpath, pos - 1)) != -1) { |
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124 PyObject *val; |
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125 |
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126 key = PyBytes_FromStringAndSize(cpath, pos); |
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127 |
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128 if (key == NULL) |
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129 goto bail; |
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130 |
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131 val = PyDict_GetItem(dirs, key); |
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132 if (val == NULL) { |
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133 PyErr_SetString(PyExc_ValueError, |
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134 "expected a value, found none"); |
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135 goto bail; |
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136 } |
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137 |
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138 if (--PYLONG_VALUE(val) <= 0) { |
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139 if (PyDict_DelItem(dirs, key) == -1) |
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140 goto bail; |
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141 } else |
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142 break; |
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143 Py_CLEAR(key); |
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144 } |
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145 ret = 0; |
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146 |
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147 bail: |
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148 Py_XDECREF(key); |
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149 |
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150 return ret; |
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151 } |
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152 |
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153 static int dirs_fromdict(PyObject *dirs, PyObject *source, char skipchar) |
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154 { |
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155 PyObject *key, *value; |
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156 Py_ssize_t pos = 0; |
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157 |
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158 while (PyDict_Next(source, &pos, &key, &value)) { |
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159 if (!PyBytes_Check(key)) { |
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160 PyErr_SetString(PyExc_TypeError, "expected string key"); |
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161 return -1; |
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|
162 } |
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163 if (skipchar) { |
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164 if (!dirstate_tuple_check(value)) { |
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165 PyErr_SetString(PyExc_TypeError, |
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|
166 "expected a dirstate tuple"); |
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167 return -1; |
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|
168 } |
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169 if (((dirstateTupleObject *)value)->state == skipchar) |
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170 continue; |
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|
171 } |
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172 |
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173 if (_addpath(dirs, key) == -1) |
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174 return -1; |
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|
175 } |
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|
176 |
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177 return 0; |
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|
178 } |
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179 |
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180 static int dirs_fromiter(PyObject *dirs, PyObject *source) |
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181 { |
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182 PyObject *iter, *item = NULL; |
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183 int ret; |
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184 |
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185 iter = PyObject_GetIter(source); |
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186 if (iter == NULL) |
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187 return -1; |
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188 |
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189 while ((item = PyIter_Next(iter)) != NULL) { |
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190 if (!PyBytes_Check(item)) { |
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191 PyErr_SetString(PyExc_TypeError, "expected string"); |
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192 break; |
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|
193 } |
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194 |
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195 if (_addpath(dirs, item) == -1) |
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196 break; |
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|
197 Py_CLEAR(item); |
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|
198 } |
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199 |
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200 ret = PyErr_Occurred() ? -1 : 0; |
23960
bca4b6f126f2
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Augie Fackler <augie@google.com>
parents:
21809
diff
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|
201 Py_DECREF(iter); |
18900
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202 Py_XDECREF(item); |
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203 return ret; |
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|
204 } |
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|
205 |
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|
206 /* |
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207 * Calculate a refcounted set of directory names for the files in a |
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208 * dirstate. |
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|
209 */ |
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210 static int dirs_init(dirsObject *self, PyObject *args) |
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211 { |
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|
212 PyObject *dirs = NULL, *source = NULL; |
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|
213 char skipchar = 0; |
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|
214 int ret = -1; |
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|
215 |
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|
216 self->dict = NULL; |
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|
217 |
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218 if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar)) |
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219 return -1; |
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220 |
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221 dirs = PyDict_New(); |
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222 |
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223 if (dirs == NULL) |
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224 return -1; |
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225 |
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|
226 if (source == NULL) |
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227 ret = 0; |
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228 else if (PyDict_Check(source)) |
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229 ret = dirs_fromdict(dirs, source, skipchar); |
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230 else if (skipchar) |
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231 PyErr_SetString(PyExc_ValueError, |
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232 "skip character is only supported " |
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233 "with a dict source"); |
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|
234 else |
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235 ret = dirs_fromiter(dirs, source); |
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236 |
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237 if (ret == -1) |
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238 Py_XDECREF(dirs); |
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|
239 else |
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240 self->dict = dirs; |
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241 |
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242 return ret; |
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243 } |
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244 |
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245 PyObject *dirs_addpath(dirsObject *self, PyObject *args) |
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246 { |
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247 PyObject *path; |
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248 |
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249 if (!PyArg_ParseTuple(args, "O!:addpath", &PyBytes_Type, &path)) |
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250 return NULL; |
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251 |
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252 if (_addpath(self->dict, path) == -1) |
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253 return NULL; |
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254 |
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255 Py_RETURN_NONE; |
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256 } |
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257 |
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258 static PyObject *dirs_delpath(dirsObject *self, PyObject *args) |
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259 { |
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260 PyObject *path; |
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261 |
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262 if (!PyArg_ParseTuple(args, "O!:delpath", &PyBytes_Type, &path)) |
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263 return NULL; |
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264 |
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265 if (_delpath(self->dict, path) == -1) |
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266 return NULL; |
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267 |
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268 Py_RETURN_NONE; |
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269 } |
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270 |
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271 static int dirs_contains(dirsObject *self, PyObject *value) |
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272 { |
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273 return PyBytes_Check(value) ? PyDict_Contains(self->dict, value) : 0; |
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274 } |
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275 |
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276 static void dirs_dealloc(dirsObject *self) |
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277 { |
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278 Py_XDECREF(self->dict); |
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279 PyObject_Del(self); |
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280 } |
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281 |
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282 static PyObject *dirs_iter(dirsObject *self) |
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283 { |
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284 return PyObject_GetIter(self->dict); |
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285 } |
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286 |
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287 static PySequenceMethods dirs_sequence_methods; |
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288 |
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289 static PyMethodDef dirs_methods[] = { |
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290 {"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"}, |
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291 {"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"}, |
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292 {NULL} /* Sentinel */ |
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293 }; |
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294 |
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295 static PyTypeObject dirsType = { PyVarObject_HEAD_INIT(NULL, 0) }; |
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296 |
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297 void dirs_module_init(PyObject *mod) |
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298 { |
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299 dirs_sequence_methods.sq_contains = (objobjproc)dirs_contains; |
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300 dirsType.tp_name = "parsers.dirs"; |
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301 dirsType.tp_new = PyType_GenericNew; |
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302 dirsType.tp_basicsize = sizeof(dirsObject); |
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303 dirsType.tp_dealloc = (destructor)dirs_dealloc; |
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304 dirsType.tp_as_sequence = &dirs_sequence_methods; |
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305 dirsType.tp_flags = Py_TPFLAGS_DEFAULT; |
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306 dirsType.tp_doc = "dirs"; |
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307 dirsType.tp_iter = (getiterfunc)dirs_iter; |
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308 dirsType.tp_methods = dirs_methods; |
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309 dirsType.tp_init = (initproc)dirs_init; |
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310 |
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311 if (PyType_Ready(&dirsType) < 0) |
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312 return; |
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313 Py_INCREF(&dirsType); |
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314 |
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315 PyModule_AddObject(mod, "dirs", (PyObject *)&dirsType); |
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316 } |