Mercurial > cpython-lru_cache-weakref

annotate Objects/enumobject.c @ 39496:352ffe77b71d legacy-trunk

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Patch #1535500: fix segfault in BZ2File.writelines and make sure it raises the correct exceptions.
author Georg Brandl <georg@python.org>
date Mon, 14 Aug 2006 21:42:55 +0000
parents 7b2e436a4a21
children 1ad0568737f6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* enumerate object */
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2
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3 #include "Python.h"
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4
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5 typedef struct {
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6 PyObject_HEAD
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7 long en_index; /* current index of enumeration */
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8 PyObject* en_sit; /* secondary iterator of enumeration */
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9 PyObject* en_result; /* result tuple */
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10 } enumobject;
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11
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12 static PyObject *
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13 enum_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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14 {
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15 enumobject *en;
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16 PyObject *seq = NULL;
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17 static char *kwlist[] = {"sequence", 0};
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18
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19 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:enumerate", kwlist,
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20 &seq))
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21 return NULL;
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22
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23 en = (enumobject *)type->tp_alloc(type, 0);
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24 if (en == NULL)
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25 return NULL;
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26 en->en_index = 0;
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27 en->en_sit = PyObject_GetIter(seq);
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28 if (en->en_sit == NULL) {
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29 Py_DECREF(en);
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30 return NULL;
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31 }
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32 en->en_result = PyTuple_Pack(2, Py_None, Py_None);
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33 if (en->en_result == NULL) {
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34 Py_DECREF(en);
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35 return NULL;
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36 }
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37 return (PyObject *)en;
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38 }
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39
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40 static void
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41 enum_dealloc(enumobject *en)
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42 {
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43 PyObject_GC_UnTrack(en);
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44 Py_XDECREF(en->en_sit);
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45 Py_XDECREF(en->en_result);
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46 en->ob_type->tp_free(en);
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47 }
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48
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49 static int
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50 enum_traverse(enumobject *en, visitproc visit, void *arg)
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51 {
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52 Py_VISIT(en->en_sit);
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53 Py_VISIT(en->en_result);
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54 return 0;
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55 }
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56
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57 static PyObject *
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58 enum_next(enumobject *en)
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59 {
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60 PyObject *next_index;
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61 PyObject *next_item;
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62 PyObject *result = en->en_result;
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63 PyObject *it = en->en_sit;
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64
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65 next_item = (*it->ob_type->tp_iternext)(it);
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66 if (next_item == NULL)
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67 return NULL;
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68
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69 next_index = PyInt_FromLong(en->en_index);
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70 if (next_index == NULL) {
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71 Py_DECREF(next_item);
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72 return NULL;
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73 }
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74 en->en_index++;
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75
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76 if (result->ob_refcnt == 1) {
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77 Py_INCREF(result);
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78 Py_DECREF(PyTuple_GET_ITEM(result, 0));
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79 Py_DECREF(PyTuple_GET_ITEM(result, 1));
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80 } else {
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81 result = PyTuple_New(2);
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82 if (result == NULL) {
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83 Py_DECREF(next_index);
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84 Py_DECREF(next_item);
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85 return NULL;
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86 }
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87 }
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88 PyTuple_SET_ITEM(result, 0, next_index);
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89 PyTuple_SET_ITEM(result, 1, next_item);
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90 return result;
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91 }
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92
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93 PyDoc_STRVAR(enum_doc,
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94 "enumerate(iterable) -> iterator for index, value of iterable\n"
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95 "\n"
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96 "Return an enumerate object. iterable must be an other object that supports\n"
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97 "iteration. The enumerate object yields pairs containing a count (from\n"
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98 "zero) and a value yielded by the iterable argument. enumerate is useful\n"
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99 "for obtaining an indexed list: (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
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100
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101 PyTypeObject PyEnum_Type = {
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102 PyObject_HEAD_INIT(&PyType_Type)
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103 0, /* ob_size */
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104 "enumerate", /* tp_name */
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105 sizeof(enumobject), /* tp_basicsize */
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106 0, /* tp_itemsize */
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107 /* methods */
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108 (destructor)enum_dealloc, /* tp_dealloc */
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109 0, /* tp_print */
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110 0, /* tp_getattr */
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111 0, /* tp_setattr */
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112 0, /* tp_compare */
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113 0, /* tp_repr */
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114 0, /* tp_as_number */
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115 0, /* tp_as_sequence */
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116 0, /* tp_as_mapping */
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117 0, /* tp_hash */
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118 0, /* tp_call */
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119 0, /* tp_str */
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120 PyObject_GenericGetAttr, /* tp_getattro */
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121 0, /* tp_setattro */
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122 0, /* tp_as_buffer */
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123 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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124 Py_TPFLAGS_BASETYPE, /* tp_flags */
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125 enum_doc, /* tp_doc */
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126 (traverseproc)enum_traverse, /* tp_traverse */
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127 0, /* tp_clear */
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128 0, /* tp_richcompare */
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129 0, /* tp_weaklistoffset */
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130 PyObject_SelfIter, /* tp_iter */
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131 (iternextfunc)enum_next, /* tp_iternext */
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132 0, /* tp_methods */
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133 0, /* tp_members */
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134 0, /* tp_getset */
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135 0, /* tp_base */
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136 0, /* tp_dict */
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137 0, /* tp_descr_get */
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138 0, /* tp_descr_set */
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139 0, /* tp_dictoffset */
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140 0, /* tp_init */
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141 PyType_GenericAlloc, /* tp_alloc */
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142 enum_new, /* tp_new */
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143 PyObject_GC_Del, /* tp_free */
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144 };
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145
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146 /* Reversed Object ***************************************************************/
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147
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148 typedef struct {
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149 PyObject_HEAD
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150 Py_ssize_t index;
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151 PyObject* seq;
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152 } reversedobject;
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153
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154 static PyObject *
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155 reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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156 {
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157 Py_ssize_t n;
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158 PyObject *seq;
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159 reversedobject *ro;
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160
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161 if (!PyArg_UnpackTuple(args, "reversed", 1, 1, &seq))
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162 return NULL;
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163
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164 if (PyObject_HasAttrString(seq, "__reversed__"))
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165 return PyObject_CallMethod(seq, "__reversed__", NULL);
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166
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167 if (!PySequence_Check(seq)) {
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168 PyErr_SetString(PyExc_TypeError,
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169 "argument to reversed() must be a sequence");
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170 return NULL;
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171 }
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172
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173 n = PySequence_Size(seq);
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174 if (n == -1)
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175 return NULL;
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176
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177 ro = (reversedobject *)type->tp_alloc(type, 0);
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178 if (ro == NULL)
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179 return NULL;
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180
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181 ro->index = n-1;
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182 Py_INCREF(seq);
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183 ro->seq = seq;
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184 return (PyObject *)ro;
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185 }
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186
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187 static void
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188 reversed_dealloc(reversedobject *ro)
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189 {
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190 PyObject_GC_UnTrack(ro);
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191 Py_XDECREF(ro->seq);
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192 ro->ob_type->tp_free(ro);
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193 }
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194
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195 static int
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196 reversed_traverse(reversedobject *ro, visitproc visit, void *arg)
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197 {
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198 Py_VISIT(ro->seq);
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199 return 0;
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200 }
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201
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202 static PyObject *
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203 reversed_next(reversedobject *ro)
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204 {
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205 PyObject *item;
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206 Py_ssize_t index = ro->index;
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207
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208 if (index >= 0) {
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209 item = PySequence_GetItem(ro->seq, index);
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210 if (item != NULL) {
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211 ro->index--;
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212 return item;
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213 }
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214 if (PyErr_ExceptionMatches(PyExc_IndexError) ||
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215 PyErr_ExceptionMatches(PyExc_StopIteration))
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216 PyErr_Clear();
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217 }
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218 ro->index = -1;
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219 Py_CLEAR(ro->seq);
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220 return NULL;
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221 }
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222
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223 PyDoc_STRVAR(reversed_doc,
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224 "reversed(sequence) -> reverse iterator over values of the sequence\n"
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225 "\n"
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226 "Return a reverse iterator");
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227
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228 static PyObject *
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229 reversed_len(reversedobject *ro)
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230 {
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231 Py_ssize_t position, seqsize;
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232
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233 if (ro->seq == NULL)
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234 return PyInt_FromLong(0);
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235 seqsize = PySequence_Size(ro->seq);
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236 if (seqsize == -1)
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237 return NULL;
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238 position = ro->index + 1;
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239 return PyInt_FromSsize_t((seqsize < position) ? 0 : position);
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240 }
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241
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242 PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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243
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244 static PyMethodDef reversediter_methods[] = {
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245 {"__length_hint__", (PyCFunction)reversed_len, METH_NOARGS, length_hint_doc},
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246 {NULL, NULL} /* sentinel */
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247 };
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248
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249 PyTypeObject PyReversed_Type = {
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250 PyObject_HEAD_INIT(&PyType_Type)
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251 0, /* ob_size */
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252 "reversed", /* tp_name */
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253 sizeof(reversedobject), /* tp_basicsize */
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254 0, /* tp_itemsize */
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255 /* methods */
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256 (destructor)reversed_dealloc, /* tp_dealloc */
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257 0, /* tp_print */
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258 0, /* tp_getattr */
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259 0, /* tp_setattr */
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260 0, /* tp_compare */
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261 0, /* tp_repr */
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262 0, /* tp_as_number */
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263 0, /* tp_as_sequence */
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264 0, /* tp_as_mapping */
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265 0, /* tp_hash */
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266 0, /* tp_call */
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267 0, /* tp_str */
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268 PyObject_GenericGetAttr, /* tp_getattro */
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269 0, /* tp_setattro */
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270 0, /* tp_as_buffer */
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271 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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272 Py_TPFLAGS_BASETYPE, /* tp_flags */
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273 reversed_doc, /* tp_doc */
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274 (traverseproc)reversed_traverse,/* tp_traverse */
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275 0, /* tp_clear */
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276 0, /* tp_richcompare */
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277 0, /* tp_weaklistoffset */
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278 PyObject_SelfIter, /* tp_iter */
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279 (iternextfunc)reversed_next, /* tp_iternext */
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280 reversediter_methods, /* tp_methods */
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281 0, /* tp_members */
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282 0, /* tp_getset */
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283 0, /* tp_base */
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284 0, /* tp_dict */
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285 0, /* tp_descr_get */
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286 0, /* tp_descr_set */
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287 0, /* tp_dictoffset */
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288 0, /* tp_init */
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289 PyType_GenericAlloc, /* tp_alloc */
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290 reversed_new, /* tp_new */
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291 PyObject_GC_Del, /* tp_free */
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292 };