Mercurial > cpython-lru_cache-weakref

annotate Objects/structseq.c @ 21283:d4907cdcc299 legacy-trunk

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Use an immutable tuple for __slots instead of a mutable list Bump version number
author Andrew M. Kuchling <amk@amk.ca>
date Fri, 07 Dec 2001 14:22:13 +0000
parents 94f5a9fa3583
children 1a5110b4bd72
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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20540
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1 /* Implementation helper: a struct that looks like a tuple. See timemodule
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2 and posixmodule for example uses. */
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3
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4 #include "Python.h"
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5 #include "structmember.h"
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6 #include "structseq.h"
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7
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8 static char visible_length_key[] = "n_sequence_fields";
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9 static char real_length_key[] = "n_fields";
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10
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11 #define VISIBLE_SIZE(op) ((op)->ob_size)
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12 #define VISIBLE_SIZE_TP(tp) PyInt_AsLong( \
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13 PyDict_GetItemString((tp)->tp_dict, visible_length_key))
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14
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15 #define REAL_SIZE_TP(tp) PyInt_AsLong( \
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16 PyDict_GetItemString((tp)->tp_dict, real_length_key))
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17 #define REAL_SIZE(op) REAL_SIZE_TP((op)->ob_type)
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18
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19
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20 PyObject *
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21 PyStructSequence_New(PyTypeObject *type)
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22 {
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23 PyStructSequence *obj;
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24
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25 obj = PyObject_New(PyStructSequence, type);
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26 obj->ob_size = VISIBLE_SIZE_TP(type);
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27
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28 return (PyObject*) obj;
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29 }
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30
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31 static void
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32 structseq_dealloc(PyStructSequence *obj)
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33 {
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34 int i, size;
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35
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36 size = REAL_SIZE(obj);
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37 for (i = 0; i < size; ++i) {
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38 Py_XDECREF(obj->ob_item[i]);
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39 }
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40 PyObject_FREE(obj);
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41 }
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42
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43 static int
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44 structseq_length(PyStructSequence *obj)
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45 {
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46 return VISIBLE_SIZE(obj);
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47 }
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48
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49 static PyObject*
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50 structseq_item(PyStructSequence *obj, int i)
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51 {
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52 if (i < 0 || i >= VISIBLE_SIZE(obj)) {
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53 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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54 return NULL;
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55 }
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56 Py_INCREF(obj->ob_item[i]);
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57 return obj->ob_item[i];
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58 }
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59
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60 static PyObject*
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61 structseq_slice(PyStructSequence *obj, int low, int high)
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62 {
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63 PyTupleObject *np;
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64 int i;
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65
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66 if (low < 0)
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67 low = 0;
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68 if (high > VISIBLE_SIZE(obj))
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69 high = VISIBLE_SIZE(obj);
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70 if (high < low)
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71 high = low;
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72 np = (PyTupleObject *)PyTuple_New(high-low);
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73 if (np == NULL)
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74 return NULL;
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75 for(i = low; i < high; ++i) {
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76 PyObject *v = obj->ob_item[i];
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77 Py_INCREF(v);
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78 PyTuple_SET_ITEM(np, i-low, v);
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79 }
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80 return (PyObject *) np;
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81 }
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82
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83 static PyObject *
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84 structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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85 {
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86 PyObject *arg = NULL;
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87 PyStructSequence *res = NULL;
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88 int len, required_len, i;
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89 static char *kwlist[] = {"sequence", 0};
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90 static char msgbuf[128];
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91
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92 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O:structseq",
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93 kwlist, &arg))
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94 return NULL;
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95
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96 if (!PySequence_Check(arg)) {
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97 PyErr_SetString(PyExc_TypeError,
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98 "constructor requires a sequence");
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99 return NULL;
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100 }
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101
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102 len = PySequence_Length(arg);
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103 required_len = REAL_SIZE_TP(type);
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104 if (len != required_len) {
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105 PyOS_snprintf(
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106 msgbuf, sizeof(msgbuf),
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107 "constructor takes exactly %d arguments (%d given)",
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108 required_len,
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109 len);
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110 PyErr_SetString(PyExc_TypeError, msgbuf);
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111 return NULL;
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112 }
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113
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114 res = (PyStructSequence*) PyStructSequence_New(type);
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115 for (i = 0; i < len; ++i) {
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116 /* INCREF???? XXXX */
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117 res->ob_item[i] = PySequence_GetItem(arg, i);
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118 }
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119
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120 return (PyObject*) res;
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121 }
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122
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123 static PyObject *
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124 make_tuple(PyStructSequence *obj)
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125 {
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126 return structseq_slice(obj, 0, VISIBLE_SIZE(obj));
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127 }
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128
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129 static PyObject *
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130 structseq_repr(PyStructSequence *obj)
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131 {
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132 PyObject *tup, *str;
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133 tup = make_tuple(obj);
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134 str = PyObject_Repr(tup);
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135 Py_DECREF(tup);
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136 return str;
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137 }
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138
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139 static PyObject *
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140 structseq_concat(PyStructSequence *obj, PyObject *b)
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141 {
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142 PyObject *tup, *result;
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143 tup = make_tuple(obj);
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144 result = PySequence_Concat(tup, b);
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145 Py_DECREF(tup);
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diff changeset
146 return result;
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diff changeset
147 }
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diff changeset
148
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parents:
diff changeset
149 static PyObject *
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diff changeset
150 structseq_repeat(PyStructSequence *obj, int n)
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diff changeset
151 {
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diff changeset
152 PyObject *tup, *result;
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diff changeset
153 tup = make_tuple(obj);
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diff changeset
154 result = PySequence_Repeat(tup, n);
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diff changeset
155 Py_DECREF(tup);
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diff changeset
156 return result;
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diff changeset
157 }
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diff changeset
158
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diff changeset
159 static int
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diff changeset
160 structseq_contains(PyStructSequence *obj, PyObject *o)
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diff changeset
161 {
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diff changeset
162 PyObject *tup;
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diff changeset
163 int result;
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diff changeset
164 tup = make_tuple(obj);
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165 result = PySequence_Contains(tup, o);
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166 Py_DECREF(tup);
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diff changeset
167 return result;
ad2662095d77 Missing file structseq.c for SF patch #462296
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diff changeset
168 }
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169
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diff changeset
170 static long
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171 structseq_hash(PyObject *obj)
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diff changeset
172 {
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diff changeset
173 PyObject *tup;
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diff changeset
174 long result;
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diff changeset
175 tup = make_tuple((PyStructSequence*) obj);
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diff changeset
176 result = PyObject_Hash(tup);
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diff changeset
177 Py_DECREF(tup);
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178 return result;
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diff changeset
179 }
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diff changeset
180
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diff changeset
181 static PyObject *
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diff changeset
182 structseq_richcompare(PyObject *obj, PyObject *o2, int op)
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diff changeset
183 {
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diff changeset
184 PyObject *tup, *result;
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diff changeset
185 tup = make_tuple((PyStructSequence*) obj);
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diff changeset
186 result = PyObject_RichCompare(tup, o2, op);
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diff changeset
187 Py_DECREF(tup);
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diff changeset
188 return result;
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diff changeset
189 }
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diff changeset
190
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parents:
diff changeset
191 static PySequenceMethods structseq_as_sequence = {
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diff changeset
192 (inquiry)structseq_length,
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parents:
diff changeset
193 (binaryfunc)structseq_concat, /* sq_concat */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
194 (intargfunc)structseq_repeat, /* sq_repeat */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
195 (intargfunc)structseq_item, /* sq_item */
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parents:
diff changeset
196 (intintargfunc)structseq_slice, /* sq_slice */
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Guido van Rossum <guido@python.org>
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diff changeset
197 0, /* sq_ass_item */
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diff changeset
198 0, /* sq_ass_slice */
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diff changeset
199 (objobjproc)structseq_contains, /* sq_contains */
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diff changeset
200 };
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diff changeset
201
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diff changeset
202 static PyTypeObject _struct_sequence_template = {
ad2662095d77 Missing file structseq.c for SF patch #462296
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diff changeset
203 PyObject_HEAD_INIT(&PyType_Type)
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diff changeset
204 0, /* ob_size */
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diff changeset
205 NULL, /* tp_name */
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parents:
diff changeset
206 0, /* tp_basicsize */
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parents:
diff changeset
207 0, /* tp_itemsize */
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diff changeset
208 (destructor)structseq_dealloc, /* tp_dealloc */
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parents:
diff changeset
209 0, /* tp_print */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
210 0, /* tp_getattr */
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parents:
diff changeset
211 0, /* tp_setattr */
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diff changeset
212 0, /* tp_compare */
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diff changeset
213 (reprfunc)structseq_repr, /* tp_repr */
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parents:
diff changeset
214 0, /* tp_as_number */
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diff changeset
215 &structseq_as_sequence, /* tp_as_sequence */
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parents:
diff changeset
216 0, /* tp_as_mapping */
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parents:
diff changeset
217 (hashfunc)structseq_hash, /* tp_hash */
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parents:
diff changeset
218 0, /* tp_call */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
219 0, /* tp_str */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
220 0, /* tp_getattro */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
221 0, /* tp_setattro */
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Guido van Rossum <guido@python.org>
parents:
diff changeset
222 0, /* tp_as_buffer */
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diff changeset
223 Py_TPFLAGS_DEFAULT, /* tp_flags */
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diff changeset
224 NULL, /* tp_doc */
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diff changeset
225 0, /* tp_traverse */
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diff changeset
226 0, /* tp_clear */
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diff changeset
227 structseq_richcompare, /* tp_richcompare */
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parents:
diff changeset
228 0, /* tp_weaklistoffset */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
229 0, /* tp_iter */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
230 0, /* tp_iternext */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
231 0, /* tp_methods */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
232 NULL, /* tp_members */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
233 0, /* tp_getset */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
234 0, /* tp_base */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
235 0, /* tp_dict */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
236 0, /* tp_descr_get */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
237 0, /* tp_descr_set */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
238 0, /* tp_dictoffset */
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
239 0, /* tp_init */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
240 0, /* tp_alloc */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
241 structseq_new, /* tp_new */
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
242 };
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
243
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
244 void
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
245 PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
246 {
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
247 PyObject *dict;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
248 PyMemberDef* members;
ad2662095d77 Missing file structseq.c for SF patch #462296
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diff changeset
249 int n_members, i;
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
250
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
251 for (i = 0; desc->fields[i].name != NULL; ++i)
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
252 ;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
253 n_members = i;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
254
ad2662095d77 Missing file structseq.c for SF patch #462296
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diff changeset
255 memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
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parents:
diff changeset
256 type->tp_name = desc->name;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
257 type->tp_doc = desc->doc;
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parents:
diff changeset
258 type->tp_basicsize = sizeof(PyStructSequence)+
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
259 sizeof(PyObject*)*(n_members-1);
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
260 type->tp_itemsize = 0;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
261
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
262 members = PyMem_NEW(PyMemberDef, n_members+1);
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
263
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
264 for (i = 0; i < n_members; ++i) {
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
265 members[i].name = desc->fields[i].name;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
266 members[i].type = T_OBJECT;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
267 members[i].offset = offsetof(PyStructSequence, ob_item)
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
268 + i * sizeof(PyObject*);
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
269 members[i].flags = READONLY;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
270 members[i].doc = desc->fields[i].doc;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
271 }
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
272 members[n_members].name = NULL;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
273
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
274 type->tp_members = members;
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
275
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
276 if (PyType_Ready(type) < 0)
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
277 return;
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
278 Py_INCREF(type);
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
279
ad2662095d77 Missing file structseq.c for SF patch #462296
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parents:
diff changeset
280 dict = type->tp_dict;
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
281 PyDict_SetItemString(dict, visible_length_key,
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
282 PyInt_FromLong((long) desc->n_in_sequence));
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
283 PyDict_SetItemString(dict, real_length_key,
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
284 PyInt_FromLong((long) n_members));
ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
diff changeset
285 }