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annotate Objects/enumobject.c @ 31420:be56fc485e27 legacy-trunk

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no reason not to use boilerplate.tex now that it names the PSF
author Fred Drake <fdrake@acm.org>
date Fri, 23 Jan 2004 15:23:49 +0000
parents 682d1b67c7b5
children f04ccc288542
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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afe263672fd8 - New builtin function enumerate(x), from PEP 279. Example:
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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 PyTypeObject PyEnum_Type;
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13
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14 static PyObject *
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15 enum_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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16 {
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17 enumobject *en;
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18 PyObject *seq = NULL;
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19 static char *kwlist[] = {"sequence", 0};
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20
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21 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:enumerate", kwlist,
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22 &seq))
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23 return NULL;
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24
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25 en = (enumobject *)type->tp_alloc(type, 0);
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26 if (en == NULL)
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27 return NULL;
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28 en->en_index = 0;
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29 en->en_sit = PyObject_GetIter(seq);
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30 if (en->en_sit == NULL) {
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31 Py_DECREF(en);
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32 return NULL;
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33 }
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34 en->en_result = PyTuple_Pack(2, Py_None, Py_None);
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35 if (en->en_result == NULL) {
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36 Py_DECREF(en->en_sit);
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37 Py_DECREF(en);
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38 return NULL;
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39 }
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40 return (PyObject *)en;
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41 }
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42
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43 static void
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44 enum_dealloc(enumobject *en)
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45 {
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46 PyObject_GC_UnTrack(en);
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47 Py_XDECREF(en->en_sit);
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48 Py_XDECREF(en->en_result);
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49 en->ob_type->tp_free(en);
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50 }
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51
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52 static int
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53 enum_traverse(enumobject *en, visitproc visit, void *arg)
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54 {
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55 int err;
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56
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57 if (en->en_sit) {
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58 err = visit(en->en_sit, arg);
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59 if (err)
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60 return err;
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61 }
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62 if (en->en_result) {
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63 err = visit(en->en_result, arg);
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64 if (err)
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65 return err;
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66 }
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67 return 0;
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68 }
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69
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70 static PyObject *
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71 enum_next(enumobject *en)
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72 {
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73 PyObject *next_index;
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74 PyObject *next_item;
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75 PyObject *result = en->en_result;
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76 PyObject *it = en->en_sit;
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77
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78 next_item = (*it->ob_type->tp_iternext)(it);
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79 if (next_item == NULL)
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80 return NULL;
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81
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82 next_index = PyInt_FromLong(en->en_index);
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83 if (next_index == NULL) {
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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 en->en_index++;
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88
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89 if (result->ob_refcnt == 1) {
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90 Py_INCREF(result);
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91 Py_DECREF(PyTuple_GET_ITEM(result, 0));
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92 Py_DECREF(PyTuple_GET_ITEM(result, 1));
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93 } else {
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94 result = PyTuple_New(2);
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95 if (result == NULL) {
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96 Py_DECREF(next_index);
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97 Py_DECREF(next_item);
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98 return NULL;
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99 }
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100 }
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101 PyTuple_SET_ITEM(result, 0, next_index);
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102 PyTuple_SET_ITEM(result, 1, next_item);
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103 return result;
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104 }
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105
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106 PyDoc_STRVAR(enum_doc,
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107 "enumerate(iterable) -> iterator for index, value of iterable\n"
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108 "\n"
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109 "Return an enumerate object. iterable must be an other object that supports\n"
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110 "iteration. The enumerate object yields pairs containing a count (from\n"
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111 "zero) and a value yielded by the iterable argument. enumerate is useful\n"
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112 "for obtaining an indexed list: (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
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113
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114 PyTypeObject PyEnum_Type = {
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115 PyObject_HEAD_INIT(&PyType_Type)
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116 0, /* ob_size */
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117 "enumerate", /* tp_name */
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118 sizeof(enumobject), /* tp_basicsize */
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119 0, /* tp_itemsize */
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120 /* methods */
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121 (destructor)enum_dealloc, /* tp_dealloc */
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122 0, /* tp_print */
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123 0, /* tp_getattr */
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124 0, /* tp_setattr */
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125 0, /* tp_compare */
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126 0, /* tp_repr */
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127 0, /* tp_as_number */
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128 0, /* tp_as_sequence */
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129 0, /* tp_as_mapping */
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130 0, /* tp_hash */
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131 0, /* tp_call */
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132 0, /* tp_str */
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133 PyObject_GenericGetAttr, /* tp_getattro */
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134 0, /* tp_setattro */
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135 0, /* tp_as_buffer */
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136 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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137 Py_TPFLAGS_BASETYPE, /* tp_flags */
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138 enum_doc, /* tp_doc */
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139 (traverseproc)enum_traverse, /* tp_traverse */
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140 0, /* tp_clear */
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141 0, /* tp_richcompare */
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142 0, /* tp_weaklistoffset */
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143 PyObject_SelfIter, /* tp_iter */
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144 (iternextfunc)enum_next, /* tp_iternext */
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145 0, /* tp_methods */
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146 0, /* tp_members */
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147 0, /* tp_getset */
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148 0, /* tp_base */
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149 0, /* tp_dict */
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150 0, /* tp_descr_get */
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151 0, /* tp_descr_set */
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152 0, /* tp_dictoffset */
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153 0, /* tp_init */
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154 PyType_GenericAlloc, /* tp_alloc */
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155 enum_new, /* tp_new */
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156 PyObject_GC_Del, /* tp_free */
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157 };
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158
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159 /* Reversed Object ***************************************************************/
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160
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161 typedef struct {
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162 PyObject_HEAD
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163 long index;
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164 PyObject* seq;
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165 } reversedobject;
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166
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167 static PyObject *
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168 reversed_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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169 {
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170 long n;
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171 PyObject *seq;
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172 reversedobject *ro;
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173
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174 if (!PyArg_UnpackTuple(args, "reversed", 1, 1, &seq))
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175 return NULL;
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176
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177 /* Special case optimization for xrange and lists */
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178 if (PyRange_Check(seq) || PyList_Check(seq))
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179 return PyObject_CallMethod(seq, "__reversed__", NULL);
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180
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181 if (!PySequence_Check(seq)) {
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182 PyErr_SetString(PyExc_TypeError,
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183 "argument to reversed() must be a sequence");
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184 return NULL;
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185 }
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186
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187 n = PySequence_Size(seq);
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188 if (n == -1)
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189 return NULL;
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190
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191 ro = (reversedobject *)type->tp_alloc(type, 0);
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192 if (ro == NULL)
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193 return NULL;
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194
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195 ro->index = n-1;
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196 Py_INCREF(seq);
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197 ro->seq = seq;
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198 return (PyObject *)ro;
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199 }
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200
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201 static void
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202 reversed_dealloc(reversedobject *ro)
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203 {
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204 PyObject_GC_UnTrack(ro);
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205 Py_XDECREF(ro->seq);
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206 ro->ob_type->tp_free(ro);
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207 }
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208
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209 static int
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210 reversed_traverse(reversedobject *ro, visitproc visit, void *arg)
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211 {
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212 if (ro->seq)
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213 return visit((PyObject *)(ro->seq), arg);
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214 return 0;
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215 }
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216
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217 static PyObject *
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218 reversed_next(reversedobject *ro)
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219 {
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220 PyObject *item;
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221
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222 if (ro->index < 0)
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223 return NULL;
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224
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225 assert(PySequence_Check(ro->seq));
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226 item = PySequence_GetItem(ro->seq, ro->index);
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227 if (item == NULL)
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228 return NULL;
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229
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230 ro->index--;
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231 return item;
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232 }
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233
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234 PyDoc_STRVAR(reversed_doc,
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235 "reverse(sequence) -> reverse iterator over values of the sequence\n"
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236 "\n"
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237 "Return a reverse iterator");
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238
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239 PyTypeObject PyReversed_Type = {
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240 PyObject_HEAD_INIT(&PyType_Type)
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241 0, /* ob_size */
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242 "reversed", /* tp_name */
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243 sizeof(reversedobject), /* tp_basicsize */
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244 0, /* tp_itemsize */
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245 /* methods */
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246 (destructor)reversed_dealloc, /* tp_dealloc */
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247 0, /* tp_print */
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248 0, /* tp_getattr */
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249 0, /* tp_setattr */
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250 0, /* tp_compare */
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251 0, /* tp_repr */
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252 0, /* tp_as_number */
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253 0, /* tp_as_sequence */
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254 0, /* tp_as_mapping */
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255 0, /* tp_hash */
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256 0, /* tp_call */
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257 0, /* tp_str */
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258 PyObject_GenericGetAttr, /* tp_getattro */
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259 0, /* tp_setattro */
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260 0, /* tp_as_buffer */
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261 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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262 Py_TPFLAGS_BASETYPE, /* tp_flags */
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263 reversed_doc, /* tp_doc */
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264 (traverseproc)reversed_traverse,/* tp_traverse */
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265 0, /* tp_clear */
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266 0, /* tp_richcompare */
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267 0, /* tp_weaklistoffset */
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268 PyObject_SelfIter, /* tp_iter */
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269 (iternextfunc)reversed_next, /* tp_iternext */
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270 0, /* tp_methods */
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271 0, /* tp_members */
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272 0, /* tp_getset */
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273 0, /* tp_base */
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274 0, /* tp_dict */
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275 0, /* tp_descr_get */
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276 0, /* tp_descr_set */
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277 0, /* tp_dictoffset */
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278 0, /* tp_init */
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279 PyType_GenericAlloc, /* tp_alloc */
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280 reversed_new, /* tp_new */
41c4e143e6e6 Implement and apply PEP 322, reverse iteration
Raymond Hettinger <python@rcn.com>
parents: 30835
diff changeset
281 PyObject_GC_Del, /* tp_free */
41c4e143e6e6 Implement and apply PEP 322, reverse iteration
Raymond Hettinger <python@rcn.com>
parents: 30835
diff changeset
282 };