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annotate Objects/enumobject.c @ 27998:e27f58a50737 legacy-trunk

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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents 27e94cacb43b
children 9c3572a5575f
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 } enumobject;
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10
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11 PyTypeObject PyEnum_Type;
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12
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13 static PyObject *
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14 enum_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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15 {
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16 enumobject *en;
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17 PyObject *seq = NULL;
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18 static char *kwlist[] = {"sequence", 0};
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19
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20 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:enumerate", kwlist,
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21 &seq))
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22 return NULL;
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23
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24 en = (enumobject *)type->tp_alloc(type, 0);
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25 if (en == NULL)
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26 return NULL;
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27 en->en_index = 0;
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28 en->en_sit = PyObject_GetIter(seq);
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29 if (en->en_sit == NULL) {
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30 Py_DECREF(en);
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31 return NULL;
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32 }
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33 return (PyObject *)en;
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34 }
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35
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36 static void
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37 enum_dealloc(enumobject *en)
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38 {
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39 PyObject_GC_UnTrack(en);
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40 Py_XDECREF(en->en_sit);
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41 en->ob_type->tp_free(en);
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42 }
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43
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44 static int
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45 enum_traverse(enumobject *en, visitproc visit, void *arg)
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46 {
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47 if (en->en_sit)
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48 return visit(en->en_sit, arg);
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49 return 0;
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50 }
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51
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52 static PyObject *
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53 enum_next(enumobject *en)
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54 {
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55 PyObject *result;
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56 PyObject *next_index;
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57 PyObject *next_item;
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58
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59 result = PyTuple_New(2);
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60 if (result == NULL)
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61 return NULL;
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62
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63 next_index = PyInt_FromLong(en->en_index);
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64 if (next_index == NULL) {
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65 Py_DECREF(result);
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66 return NULL;
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67 }
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68 PyTuple_SET_ITEM(result, 0, next_index);
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69
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70 next_item = PyIter_Next(en->en_sit);
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71 if (next_item == NULL) {
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72 Py_DECREF(result);
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73 return NULL;
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74 }
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75
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76 en->en_index++;
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77 PyTuple_SET_ITEM(result, 1, next_item);
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78 return result;
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79 }
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80
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81 static PyObject *
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82 enum_getiter(PyObject *en)
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83 {
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84 Py_INCREF(en);
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85 return en;
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86 }
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87
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88 PyDoc_STRVAR(enum_doc,
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89 "enumerate(iterable) -> create an enumerating-iterator");
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90
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91 PyTypeObject PyEnum_Type = {
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92 PyObject_HEAD_INIT(&PyType_Type)
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93 0, /* ob_size */
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94 "enumerate", /* tp_name */
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95 sizeof(enumobject), /* tp_basicsize */
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96 0, /* tp_itemsize */
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97 /* methods */
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98 (destructor)enum_dealloc, /* tp_dealloc */
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99 0, /* tp_print */
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100 0, /* tp_getattr */
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101 0, /* tp_setattr */
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102 0, /* tp_compare */
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103 0, /* tp_repr */
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104 0, /* tp_as_number */
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105 0, /* tp_as_sequence */
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106 0, /* tp_as_mapping */
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107 0, /* tp_hash */
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108 0, /* tp_call */
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109 0, /* tp_str */
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110 PyObject_GenericGetAttr, /* tp_getattro */
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111 0, /* tp_setattro */
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112 0, /* tp_as_buffer */
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113 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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114 Py_TPFLAGS_BASETYPE, /* tp_flags */
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115 enum_doc, /* tp_doc */
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116 (traverseproc)enum_traverse, /* tp_traverse */
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117 0, /* tp_clear */
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118 0, /* tp_richcompare */
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119 0, /* tp_weaklistoffset */
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120 (getiterfunc)enum_getiter, /* tp_iter */
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121 (iternextfunc)enum_next, /* tp_iternext */
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122 0, /* tp_methods */
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123 0, /* tp_members */
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124 0, /* tp_getset */
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125 0, /* tp_base */
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126 0, /* tp_dict */
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127 0, /* tp_descr_get */
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128 0, /* tp_descr_set */
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129 0, /* tp_dictoffset */
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130 0, /* tp_init */
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131 PyType_GenericAlloc, /* tp_alloc */
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132 enum_new, /* tp_new */
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133 PyObject_GC_Del, /* tp_free */
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134 };