Mercurial > cpython-lru_cache-weakref

annotate Objects/enumobject.c @ 33091:48100a01ac7c 2.3

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author Martin v. Löwis <martin@v.loewis.de>
date Thu, 12 Aug 2004 13:14:20 +0000
parents 811ad5f2f701
children 562143c1c7ae
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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_New(2);
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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 Py_INCREF(Py_None);
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41 PyTuple_SET_ITEM(en->en_result, 0, Py_None);
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42 Py_INCREF(Py_None);
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43 PyTuple_SET_ITEM(en->en_result, 1, Py_None);
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44 return (PyObject *)en;
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45 }
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46
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47 static void
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48 enum_dealloc(enumobject *en)
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49 {
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50 PyObject_GC_UnTrack(en);
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51 Py_XDECREF(en->en_sit);
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52 Py_XDECREF(en->en_result);
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53 en->ob_type->tp_free(en);
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54 }
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55
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56 static int
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57 enum_traverse(enumobject *en, visitproc visit, void *arg)
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58 {
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59 int err;
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60
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61 if (en->en_sit) {
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62 err = visit(en->en_sit, arg);
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63 if (err)
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64 return err;
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65 }
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66 if (en->en_result) {
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67 err = visit(en->en_result, arg);
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68 if (err)
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69 return err;
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70 }
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71 return 0;
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72 }
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73
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74 static PyObject *
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75 enum_next(enumobject *en)
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76 {
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77 PyObject *next_index;
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78 PyObject *next_item;
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79 PyObject *result = en->en_result;
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80 PyObject *it = en->en_sit;
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81
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82 next_item = (*it->ob_type->tp_iternext)(it);
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83 if (next_item == NULL)
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84 return NULL;
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85
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86 next_index = PyInt_FromLong(en->en_index);
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87 if (next_index == NULL) {
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88 Py_DECREF(next_item);
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89 return NULL;
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90 }
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91 en->en_index++;
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92
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93 if (result->ob_refcnt == 1) {
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94 Py_INCREF(result);
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95 Py_DECREF(PyTuple_GET_ITEM(result, 0));
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96 Py_DECREF(PyTuple_GET_ITEM(result, 1));
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97 } else {
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98 result = PyTuple_New(2);
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99 if (result == NULL) {
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100 Py_DECREF(next_index);
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101 Py_DECREF(next_item);
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102 return NULL;
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103 }
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104 }
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105 PyTuple_SET_ITEM(result, 0, next_index);
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106 PyTuple_SET_ITEM(result, 1, next_item);
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107 return result;
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108 }
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109
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110 PyDoc_STRVAR(enum_doc,
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111 "enumerate(iterable) -> iterator for index, value of iterable\n"
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112 "\n"
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113 "Return an enumerate object. iterable must be an other object that supports\n"
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114 "iteration. The enumerate object yields pairs containing a count (from\n"
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115 "zero) and a value yielded by the iterable argument. enumerate is useful\n"
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116 "for obtaining an indexed list: (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
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117
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118 PyTypeObject PyEnum_Type = {
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119 PyObject_HEAD_INIT(&PyType_Type)
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120 0, /* ob_size */
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121 "enumerate", /* tp_name */
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122 sizeof(enumobject), /* tp_basicsize */
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123 0, /* tp_itemsize */
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124 /* methods */
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125 (destructor)enum_dealloc, /* tp_dealloc */
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126 0, /* tp_print */
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127 0, /* tp_getattr */
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128 0, /* tp_setattr */
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129 0, /* tp_compare */
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130 0, /* tp_repr */
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131 0, /* tp_as_number */
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132 0, /* tp_as_sequence */
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133 0, /* tp_as_mapping */
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134 0, /* tp_hash */
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135 0, /* tp_call */
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136 0, /* tp_str */
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137 PyObject_GenericGetAttr, /* tp_getattro */
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138 0, /* tp_setattro */
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139 0, /* tp_as_buffer */
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140 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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141 Py_TPFLAGS_BASETYPE, /* tp_flags */
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142 enum_doc, /* tp_doc */
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143 (traverseproc)enum_traverse, /* tp_traverse */
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144 0, /* tp_clear */
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145 0, /* tp_richcompare */
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146 0, /* tp_weaklistoffset */
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147 PyObject_SelfIter, /* tp_iter */
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148 (iternextfunc)enum_next, /* tp_iternext */
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27e94cacb43b Remove the next() method -- one is supplied automatically by
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149 0, /* tp_methods */
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150 0, /* tp_members */
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151 0, /* tp_getset */
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152 0, /* tp_base */
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153 0, /* tp_dict */
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154 0, /* tp_descr_get */
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155 0, /* tp_descr_set */
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156 0, /* tp_dictoffset */
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157 0, /* tp_init */
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158 PyType_GenericAlloc, /* tp_alloc */
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159 enum_new, /* tp_new */
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160 PyObject_GC_Del, /* tp_free */
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161 };