annotate Objects/sliceobject.c @ 84007:dbfbdf2b5c19 3.3

Fix #17967: For ftp urls CWD to target instead of hopping to each directory towards target. This fixes a bug where target is accessible, but parent directories are restricted.
author Senthil Kumaran <senthil@uthcode.com>
date Sat, 01 Jun 2013 08:27:06 -0700
parents 365da47a6dc1
children 9214f8440c44
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1 /*
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2 Written by Jim Hugunin and Chris Chase.
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3
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4 This includes both the singular ellipsis object and slice objects.
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5
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6 Guido, feel free to do whatever you want in the way of copyrights
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7 for this file.
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8 */
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9
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10 /*
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11 Py_Ellipsis encodes the '...' rubber index token. It is similar to
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12 the Py_NoneStruct in that there is no way to create other objects of
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13 this type and there is exactly one in existence.
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14 */
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15
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16 #include "Python.h"
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17 #include "structmember.h"
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18
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19 static PyObject *
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20 ellipsis_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
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21 {
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22 if (PyTuple_GET_SIZE(args) || (kwargs && PyDict_Size(kwargs))) {
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23 PyErr_SetString(PyExc_TypeError, "EllipsisType takes no arguments");
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24 return NULL;
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25 }
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26 Py_INCREF(Py_Ellipsis);
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27 return Py_Ellipsis;
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28 }
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29
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30 static PyObject *
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31 ellipsis_repr(PyObject *op)
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32 {
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33 return PyUnicode_FromString("Ellipsis");
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34 }
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35
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36 PyTypeObject PyEllipsis_Type = {
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37 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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38 "ellipsis", /* tp_name */
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39 0, /* tp_basicsize */
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40 0, /* tp_itemsize */
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41 0, /*never called*/ /* tp_dealloc */
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42 0, /* tp_print */
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43 0, /* tp_getattr */
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44 0, /* tp_setattr */
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45 0, /* tp_reserved */
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46 ellipsis_repr, /* tp_repr */
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47 0, /* tp_as_number */
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48 0, /* tp_as_sequence */
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49 0, /* tp_as_mapping */
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50 0, /* tp_hash */
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51 0, /* tp_call */
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52 0, /* tp_str */
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53 PyObject_GenericGetAttr, /* tp_getattro */
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54 0, /* tp_setattro */
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55 0, /* tp_as_buffer */
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56 Py_TPFLAGS_DEFAULT, /* tp_flags */
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57 0, /* tp_doc */
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58 0, /* tp_traverse */
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59 0, /* tp_clear */
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60 0, /* tp_richcompare */
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61 0, /* tp_weaklistoffset */
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62 0, /* tp_iter */
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63 0, /* tp_iternext */
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64 0, /* tp_methods */
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65 0, /* tp_members */
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66 0, /* tp_getset */
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67 0, /* tp_base */
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68 0, /* tp_dict */
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69 0, /* tp_descr_get */
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70 0, /* tp_descr_set */
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71 0, /* tp_dictoffset */
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72 0, /* tp_init */
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73 0, /* tp_alloc */
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74 ellipsis_new, /* tp_new */
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75 };
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76
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77 PyObject _Py_EllipsisObject = {
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78 _PyObject_EXTRA_INIT
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79 1, &PyEllipsis_Type
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80 };
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81
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82
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83 /* Slice object implementation */
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84
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85 /* Using a cache is very effective since typically only a single slice is
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86 * created and then deleted again
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87 */
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88 static PySliceObject *slice_cache = NULL;
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89 void PySlice_Fini(void)
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90 {
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91 PySliceObject *obj = slice_cache;
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92 if (obj != NULL) {
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93 slice_cache = NULL;
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94 PyObject_Del(obj);
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95 }
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96 }
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97
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98 /* start, stop, and step are python objects with None indicating no
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99 index is present.
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100 */
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101
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102 PyObject *
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103 PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
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104 {
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105 PySliceObject *obj;
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106 if (slice_cache != NULL) {
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107 obj = slice_cache;
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108 slice_cache = NULL;
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109 _Py_NewReference((PyObject *)obj);
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110 } else {
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111 obj = PyObject_New(PySliceObject, &PySlice_Type);
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112 if (obj == NULL)
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113 return NULL;
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114 }
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115
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116 if (step == NULL) step = Py_None;
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117 Py_INCREF(step);
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118 if (start == NULL) start = Py_None;
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119 Py_INCREF(start);
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120 if (stop == NULL) stop = Py_None;
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121 Py_INCREF(stop);
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122
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123 obj->step = step;
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124 obj->start = start;
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125 obj->stop = stop;
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126
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127 return (PyObject *) obj;
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128 }
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129
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130 PyObject *
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131 _PySlice_FromIndices(Py_ssize_t istart, Py_ssize_t istop)
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132 {
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133 PyObject *start, *end, *slice;
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134 start = PyLong_FromSsize_t(istart);
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135 if (!start)
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136 return NULL;
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137 end = PyLong_FromSsize_t(istop);
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138 if (!end) {
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139 Py_DECREF(start);
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140 return NULL;
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141 }
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142
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143 slice = PySlice_New(start, end, NULL);
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144 Py_DECREF(start);
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145 Py_DECREF(end);
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146 return slice;
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147 }
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148
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149 int
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150 PySlice_GetIndices(PyObject *_r, Py_ssize_t length,
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151 Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
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152 {
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153 PySliceObject *r = (PySliceObject*)_r;
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154 /* XXX support long ints */
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155 if (r->step == Py_None) {
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156 *step = 1;
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157 } else {
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158 if (!PyLong_Check(r->step)) return -1;
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159 *step = PyLong_AsSsize_t(r->step);
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160 }
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161 if (r->start == Py_None) {
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162 *start = *step < 0 ? length-1 : 0;
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163 } else {
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164 if (!PyLong_Check(r->start)) return -1;
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165 *start = PyLong_AsSsize_t(r->start);
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166 if (*start < 0) *start += length;
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167 }
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168 if (r->stop == Py_None) {
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169 *stop = *step < 0 ? -1 : length;
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170 } else {
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171 if (!PyLong_Check(r->stop)) return -1;
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172 *stop = PyLong_AsSsize_t(r->stop);
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173 if (*stop < 0) *stop += length;
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174 }
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175 if (*stop > length) return -1;
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176 if (*start >= length) return -1;
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177 if (*step == 0) return -1;
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178 return 0;
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179 }
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180
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181 int
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182 PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
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183 Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
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184 Py_ssize_t *slicelength)
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185 {
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186 PySliceObject *r = (PySliceObject*)_r;
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187 /* this is harder to get right than you might think */
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188
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189 Py_ssize_t defstart, defstop;
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190
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191 if (r->step == Py_None) {
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192 *step = 1;
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193 }
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194 else {
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195 if (!_PyEval_SliceIndex(r->step, step)) return -1;
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196 if (*step == 0) {
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197 PyErr_SetString(PyExc_ValueError,
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198 "slice step cannot be zero");
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199 return -1;
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200 }
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201 /* Here *step might be -PY_SSIZE_T_MAX-1; in this case we replace it
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202 * with -PY_SSIZE_T_MAX. This doesn't affect the semantics, and it
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203 * guards against later undefined behaviour resulting from code that
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204 * does "step = -step" as part of a slice reversal.
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205 */
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206 if (*step < -PY_SSIZE_T_MAX)
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207 *step = -PY_SSIZE_T_MAX;
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208 }
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209
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210 defstart = *step < 0 ? length-1 : 0;
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211 defstop = *step < 0 ? -1 : length;
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212
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213 if (r->start == Py_None) {
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214 *start = defstart;
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215 }
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216 else {
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217 if (!_PyEval_SliceIndex(r->start, start)) return -1;
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218 if (*start < 0) *start += length;
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219 if (*start < 0) *start = (*step < 0) ? -1 : 0;
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220 if (*start >= length)
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221 *start = (*step < 0) ? length - 1 : length;
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222 }
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223
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224 if (r->stop == Py_None) {
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225 *stop = defstop;
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226 }
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227 else {
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228 if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
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229 if (*stop < 0) *stop += length;
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230 if (*stop < 0) *stop = (*step < 0) ? -1 : 0;
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231 if (*stop >= length)
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232 *stop = (*step < 0) ? length - 1 : length;
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233 }
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234
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235 if ((*step < 0 && *stop >= *start)
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236 || (*step > 0 && *start >= *stop)) {
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237 *slicelength = 0;
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238 }
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239 else if (*step < 0) {
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240 *slicelength = (*stop-*start+1)/(*step)+1;
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241 }
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242 else {
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243 *slicelength = (*stop-*start-1)/(*step)+1;
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244 }
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245
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246 return 0;
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247 }
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248
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249 static PyObject *
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250 slice_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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251 {
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252 PyObject *start, *stop, *step;
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253
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254 start = stop = step = NULL;
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255
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256 if (!_PyArg_NoKeywords("slice()", kw))
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257 return NULL;
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258
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259 if (!PyArg_UnpackTuple(args, "slice", 1, 3, &start, &stop, &step))
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260 return NULL;
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261
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262 /* This swapping of stop and start is to maintain similarity with
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263 range(). */
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264 if (stop == NULL) {
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265 stop = start;
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266 start = NULL;
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267 }
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268 return PySlice_New(start, stop, step);
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269 }
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270
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271 PyDoc_STRVAR(slice_doc,
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272 "slice(stop)\n\
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273 slice(start, stop[, step])\n\
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274 \n\
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275 Create a slice object. This is used for extended slicing (e.g. a[0:10:2]).");
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276
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277 static void
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278 slice_dealloc(PySliceObject *r)
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279 {
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280 Py_DECREF(r->step);
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281 Py_DECREF(r->start);
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282 Py_DECREF(r->stop);
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283 if (slice_cache == NULL)
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284 slice_cache = r;
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285 else
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286 PyObject_Del(r);
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287 }
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288
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289 static PyObject *
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290 slice_repr(PySliceObject *r)
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291 {
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292 return PyUnicode_FromFormat("slice(%R, %R, %R)", r->start, r->stop, r->step);
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293 }
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294
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295 static PyMemberDef slice_members[] = {
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296 {"start", T_OBJECT, offsetof(PySliceObject, start), READONLY},
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297 {"stop", T_OBJECT, offsetof(PySliceObject, stop), READONLY},
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298 {"step", T_OBJECT, offsetof(PySliceObject, step), READONLY},
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299 {0}
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300 };
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301
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302 static PyObject*
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303 slice_indices(PySliceObject* self, PyObject* len)
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304 {
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305 Py_ssize_t ilen, start, stop, step, slicelength;
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306
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307 ilen = PyNumber_AsSsize_t(len, PyExc_OverflowError);
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308
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309 if (ilen == -1 && PyErr_Occurred()) {
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310 return NULL;
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311 }
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312
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313 if (PySlice_GetIndicesEx((PyObject*)self, ilen, &start, &stop,
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314 &step, &slicelength) < 0) {
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315 return NULL;
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316 }
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317
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318 return Py_BuildValue("(nnn)", start, stop, step);
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319 }
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320
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321 PyDoc_STRVAR(slice_indices_doc,
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322 "S.indices(len) -> (start, stop, stride)\n\
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323 \n\
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324 Assuming a sequence of length len, calculate the start and stop\n\
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325 indices, and the stride length of the extended slice described by\n\
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326 S. Out of bounds indices are clipped in a manner consistent with the\n\
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327 handling of normal slices.");
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328
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329 static PyObject *
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330 slice_reduce(PySliceObject* self)
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331 {
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332 return Py_BuildValue("O(OOO)", Py_TYPE(self), self->start, self->stop, self->step);
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333 }
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334
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335 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
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336
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337 static PyMethodDef slice_methods[] = {
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338 {"indices", (PyCFunction)slice_indices,
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339 METH_O, slice_indices_doc},
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340 {"__reduce__", (PyCFunction)slice_reduce,
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341 METH_NOARGS, reduce_doc},
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342 {NULL, NULL}
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343 };
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344
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345 static PyObject *
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346 slice_richcompare(PyObject *v, PyObject *w, int op)
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347 {
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348 PyObject *t1;
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349 PyObject *t2;
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350 PyObject *res;
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351
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352 if (!PySlice_Check(v) || !PySlice_Check(w))
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353 Py_RETURN_NOTIMPLEMENTED;
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354
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355 if (v == w) {
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356 /* XXX Do we really need this shortcut?
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357 There's a unit test for it, but is that fair? */
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358 switch (op) {
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359 case Py_EQ:
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360 case Py_LE:
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361 case Py_GE:
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362 res = Py_True;
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363 break;
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364 default:
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365 res = Py_False;
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366 break;
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367 }
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368 Py_INCREF(res);
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369 return res;
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370 }
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371
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372 t1 = PyTuple_New(3);
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373 if (t1 == NULL)
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374 return NULL;
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375 t2 = PyTuple_New(3);
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376 if (t2 == NULL) {
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377 Py_DECREF(t1);
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378 return NULL;
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379 }
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380
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381 PyTuple_SET_ITEM(t1, 0, ((PySliceObject *)v)->start);
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382 PyTuple_SET_ITEM(t1, 1, ((PySliceObject *)v)->stop);
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383 PyTuple_SET_ITEM(t1, 2, ((PySliceObject *)v)->step);
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384 PyTuple_SET_ITEM(t2, 0, ((PySliceObject *)w)->start);
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385 PyTuple_SET_ITEM(t2, 1, ((PySliceObject *)w)->stop);
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386 PyTuple_SET_ITEM(t2, 2, ((PySliceObject *)w)->step);
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387
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388 res = PyObject_RichCompare(t1, t2, op);
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389
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390 PyTuple_SET_ITEM(t1, 0, NULL);
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391 PyTuple_SET_ITEM(t1, 1, NULL);
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392 PyTuple_SET_ITEM(t1, 2, NULL);
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393 PyTuple_SET_ITEM(t2, 0, NULL);
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394 PyTuple_SET_ITEM(t2, 1, NULL);
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395 PyTuple_SET_ITEM(t2, 2, NULL);
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396
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397 Py_DECREF(t1);
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398 Py_DECREF(t2);
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399
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400 return res;
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401 }
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403 PyTypeObject PySlice_Type = {
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404 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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405 "slice", /* Name of this type */
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406 sizeof(PySliceObject), /* Basic object size */
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407 0, /* Item size for varobject */
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408 (destructor)slice_dealloc, /* tp_dealloc */
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409 0, /* tp_print */
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410 0, /* tp_getattr */
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411 0, /* tp_setattr */
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412 0, /* tp_reserved */
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413 (reprfunc)slice_repr, /* tp_repr */
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414 0, /* tp_as_number */
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415 0, /* tp_as_sequence */
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416 0, /* tp_as_mapping */
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417 PyObject_HashNotImplemented, /* tp_hash */
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418 0, /* tp_call */
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419 0, /* tp_str */
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420 PyObject_GenericGetAttr, /* tp_getattro */
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421 0, /* tp_setattro */
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422 0, /* tp_as_buffer */
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423 Py_TPFLAGS_DEFAULT, /* tp_flags */
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424 slice_doc, /* tp_doc */
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425 0, /* tp_traverse */
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426 0, /* tp_clear */
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427 slice_richcompare, /* tp_richcompare */
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428 0, /* tp_weaklistoffset */
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429 0, /* tp_iter */
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430 0, /* tp_iternext */
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431 slice_methods, /* tp_methods */
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432 slice_members, /* tp_members */
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433 0, /* tp_getset */
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434 0, /* tp_base */
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435 0, /* tp_dict */
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436 0, /* tp_descr_get */
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437 0, /* tp_descr_set */
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438 0, /* tp_dictoffset */
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439 0, /* tp_init */
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440 0, /* tp_alloc */
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441 slice_new, /* tp_new */
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442 };