Mercurial > cpython-lru_cache-weakref

annotate Objects/structseq.c @ 62398:ea25129b94fe 3.1

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Blocked revisions 82071 via svnmerge ........ r82071 | alexander.belopolsky | 2010-06-18 12:57:49 -0400 (Fri, 18 Jun 2010) | 1 line Added a new line at the end of the file. ........
author Alexander Belopolsky <alexander.belopolsky@gmail.com>
date Fri, 18 Jun 2010 16:59:25 +0000
parents f197407bdba2
children 384f73a104e9
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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 static char unnamed_fields_key[] = "n_unnamed_fields";
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11
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12 /* Fields with this name have only a field index, not a field name.
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13 They are only allowed for indices < n_visible_fields. */
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14 char *PyStructSequence_UnnamedField = "unnamed field";
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15
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16 #define VISIBLE_SIZE(op) Py_SIZE(op)
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17 #define VISIBLE_SIZE_TP(tp) PyLong_AsLong( \
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18 PyDict_GetItemString((tp)->tp_dict, visible_length_key))
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20 #define REAL_SIZE_TP(tp) PyLong_AsLong( \
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21 PyDict_GetItemString((tp)->tp_dict, real_length_key))
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22 #define REAL_SIZE(op) REAL_SIZE_TP(Py_TYPE(op))
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24 #define UNNAMED_FIELDS_TP(tp) PyLong_AsLong( \
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25 PyDict_GetItemString((tp)->tp_dict, unnamed_fields_key))
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26 #define UNNAMED_FIELDS(op) UNNAMED_FIELDS_TP(Py_TYPE(op))
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28
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29 PyObject *
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30 PyStructSequence_New(PyTypeObject *type)
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31 {
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32 PyStructSequence *obj;
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33
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34 obj = PyObject_New(PyStructSequence, type);
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35 if (obj == NULL)
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36 return NULL;
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37 Py_SIZE(obj) = VISIBLE_SIZE_TP(type);
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38
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39 return (PyObject*) obj;
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40 }
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41
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42 static void
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43 structseq_dealloc(PyStructSequence *obj)
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44 {
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45 Py_ssize_t i, size;
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46
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47 size = REAL_SIZE(obj);
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48 for (i = 0; i < size; ++i) {
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49 Py_XDECREF(obj->ob_item[i]);
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50 }
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51 PyObject_Del(obj);
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52 }
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53
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54 static Py_ssize_t
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55 structseq_length(PyStructSequence *obj)
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56 {
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57 return VISIBLE_SIZE(obj);
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58 }
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59
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60 static PyObject*
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61 structseq_item(PyStructSequence *obj, Py_ssize_t i)
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62 {
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63 if (i < 0 || i >= VISIBLE_SIZE(obj)) {
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64 PyErr_SetString(PyExc_IndexError, "tuple index out of range");
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65 return NULL;
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66 }
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67 Py_INCREF(obj->ob_item[i]);
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68 return obj->ob_item[i];
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69 }
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70
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71 static PyObject*
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72 structseq_slice(PyStructSequence *obj, Py_ssize_t low, Py_ssize_t high)
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73 {
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74 PyTupleObject *np;
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75 Py_ssize_t i;
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76
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77 if (low < 0)
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78 low = 0;
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79 if (high > VISIBLE_SIZE(obj))
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80 high = VISIBLE_SIZE(obj);
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81 if (high < low)
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82 high = low;
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83 np = (PyTupleObject *)PyTuple_New(high-low);
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84 if (np == NULL)
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85 return NULL;
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86 for(i = low; i < high; ++i) {
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87 PyObject *v = obj->ob_item[i];
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88 Py_INCREF(v);
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89 PyTuple_SET_ITEM(np, i-low, v);
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90 }
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91 return (PyObject *) np;
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92 }
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93
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94 static PyObject *
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95 structseq_subscript(PyStructSequence *self, PyObject *item)
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96 {
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97 if (PyIndex_Check(item)) {
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98 Py_ssize_t i = PyNumber_AsSsize_t(item, PyExc_IndexError);
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99 if (i == -1 && PyErr_Occurred())
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100 return NULL;
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101
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102 if (i < 0)
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103 i += VISIBLE_SIZE(self);
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104
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105 if (i < 0 || i >= VISIBLE_SIZE(self)) {
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106 PyErr_SetString(PyExc_IndexError,
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107 "tuple index out of range");
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108 return NULL;
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109 }
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110 Py_INCREF(self->ob_item[i]);
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111 return self->ob_item[i];
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112 }
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113 else if (PySlice_Check(item)) {
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114 Py_ssize_t start, stop, step, slicelen, cur, i;
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115 PyObject *result;
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116
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117 if (PySlice_GetIndicesEx((PySliceObject *)item,
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118 VISIBLE_SIZE(self), &start, &stop,
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119 &step, &slicelen) < 0) {
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120 return NULL;
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121 }
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122 if (slicelen <= 0)
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123 return PyTuple_New(0);
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124 result = PyTuple_New(slicelen);
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125 if (result == NULL)
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126 return NULL;
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127 for (cur = start, i = 0; i < slicelen;
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128 cur += step, i++) {
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129 PyObject *v = self->ob_item[cur];
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130 Py_INCREF(v);
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131 PyTuple_SET_ITEM(result, i, v);
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132 }
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133 return result;
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134 }
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135 else {
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136 PyErr_SetString(PyExc_TypeError,
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137 "structseq index must be integer");
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138 return NULL;
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139 }
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140 }
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141
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142 static PyObject *
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143 structseq_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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144 {
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145 PyObject *arg = NULL;
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146 PyObject *dict = NULL;
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147 PyObject *ob;
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148 PyStructSequence *res = NULL;
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149 Py_ssize_t len, min_len, max_len, i, n_unnamed_fields;
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150 static char *kwlist[] = {"sequence", "dict", 0};
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151
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152 if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:structseq",
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153 kwlist, &arg, &dict))
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154 return NULL;
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155
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156 arg = PySequence_Fast(arg, "constructor requires a sequence");
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157
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158 if (!arg) {
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159 return NULL;
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160 }
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161
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162 if (dict && !PyDict_Check(dict)) {
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163 PyErr_Format(PyExc_TypeError,
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164 "%.500s() takes a dict as second arg, if any",
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165 type->tp_name);
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166 Py_DECREF(arg);
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167 return NULL;
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168 }
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169
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170 len = PySequence_Fast_GET_SIZE(arg);
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171 min_len = VISIBLE_SIZE_TP(type);
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172 max_len = REAL_SIZE_TP(type);
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173 n_unnamed_fields = UNNAMED_FIELDS_TP(type);
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174
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175 if (min_len != max_len) {
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176 if (len < min_len) {
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177 PyErr_Format(PyExc_TypeError,
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178 "%.500s() takes an at least %zd-sequence (%zd-sequence given)",
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179 type->tp_name, min_len, len);
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180 Py_DECREF(arg);
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181 return NULL;
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182 }
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183
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184 if (len > max_len) {
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185 PyErr_Format(PyExc_TypeError,
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186 "%.500s() takes an at most %zd-sequence (%zd-sequence given)",
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187 type->tp_name, max_len, len);
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188 Py_DECREF(arg);
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189 return NULL;
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190 }
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191 }
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192 else {
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193 if (len != min_len) {
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194 PyErr_Format(PyExc_TypeError,
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195 "%.500s() takes a %zd-sequence (%zd-sequence given)",
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196 type->tp_name, min_len, len);
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197 Py_DECREF(arg);
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198 return NULL;
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199 }
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200 }
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201
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202 res = (PyStructSequence*) PyStructSequence_New(type);
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203 if (res == NULL) {
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204 return NULL;
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205 }
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206 for (i = 0; i < len; ++i) {
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207 PyObject *v = PySequence_Fast_GET_ITEM(arg, i);
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208 Py_INCREF(v);
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209 res->ob_item[i] = v;
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210 }
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211 for (; i < max_len; ++i) {
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212 if (dict && (ob = PyDict_GetItemString(
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213 dict, type->tp_members[i-n_unnamed_fields].name))) {
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214 }
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215 else {
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216 ob = Py_None;
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217 }
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218 Py_INCREF(ob);
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219 res->ob_item[i] = ob;
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220 }
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221
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222 Py_DECREF(arg);
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223 return (PyObject*) res;
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224 }
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225
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226 static PyObject *
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227 make_tuple(PyStructSequence *obj)
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228 {
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229 return structseq_slice(obj, 0, VISIBLE_SIZE(obj));
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230 }
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231
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232 static PyObject *
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233 structseq_repr(PyStructSequence *obj)
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234 {
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235 /* buffer and type size were chosen well considered. */
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236 #define REPR_BUFFER_SIZE 512
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237 #define TYPE_MAXSIZE 100
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238
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239 PyObject *tup;
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240 PyTypeObject *typ = Py_TYPE(obj);
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241 int i, removelast = 0;
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242 Py_ssize_t len;
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243 char buf[REPR_BUFFER_SIZE];
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244 char *endofbuf, *pbuf = buf;
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245
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246 /* pointer to end of writeable buffer; safes space for "...)\0" */
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247 endofbuf= &buf[REPR_BUFFER_SIZE-5];
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248
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249 if ((tup = make_tuple(obj)) == NULL) {
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250 return NULL;
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251 }
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252
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253 /* "typename(", limited to TYPE_MAXSIZE */
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254 len = strlen(typ->tp_name) > TYPE_MAXSIZE ? TYPE_MAXSIZE :
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255 strlen(typ->tp_name);
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256 strncpy(pbuf, typ->tp_name, len);
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257 pbuf += len;
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258 *pbuf++ = '(';
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259
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260 for (i=0; i < VISIBLE_SIZE(obj); i++) {
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261 PyObject *val, *repr;
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262 char *cname, *crepr;
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263
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264 cname = typ->tp_members[i].name;
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265
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266 val = PyTuple_GetItem(tup, i);
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267 if (cname == NULL || val == NULL) {
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268 return NULL;
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269 }
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270 repr = PyObject_Repr(val);
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271 if (repr == NULL) {
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272 Py_DECREF(tup);
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273 return NULL;
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274 }
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275 crepr = _PyUnicode_AsString(repr);
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276 if (crepr == NULL) {
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277 Py_DECREF(tup);
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278 Py_DECREF(repr);
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279 return NULL;
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280 }
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281
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282 /* + 3: keep space for "=" and ", " */
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283 len = strlen(cname) + strlen(crepr) + 3;
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284 if ((pbuf+len) <= endofbuf) {
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285 strcpy(pbuf, cname);
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286 pbuf += strlen(cname);
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287 *pbuf++ = '=';
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288 strcpy(pbuf, crepr);
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289 pbuf += strlen(crepr);
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290 *pbuf++ = ',';
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291 *pbuf++ = ' ';
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292 removelast = 1;
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293 Py_DECREF(repr);
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294 }
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295 else {
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296 strcpy(pbuf, "...");
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297 pbuf += 3;
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298 removelast = 0;
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299 Py_DECREF(repr);
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300 break;
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301 }
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302 }
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303 Py_DECREF(tup);
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304 if (removelast) {
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305 /* overwrite last ", " */
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306 pbuf-=2;
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307 }
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308 *pbuf++ = ')';
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309 *pbuf = '\0';
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310
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311 return PyUnicode_FromString(buf);
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312 }
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313
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314 static PyObject *
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315 structseq_concat(PyStructSequence *obj, PyObject *b)
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316 {
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317 PyObject *tup, *result;
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318 tup = make_tuple(obj);
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319 result = PySequence_Concat(tup, b);
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320 Py_DECREF(tup);
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321 return result;
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322 }
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323
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324 static PyObject *
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325 structseq_repeat(PyStructSequence *obj, Py_ssize_t n)
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326 {
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327 PyObject *tup, *result;
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328 tup = make_tuple(obj);
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329 result = PySequence_Repeat(tup, n);
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330 Py_DECREF(tup);
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331 return result;
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332 }
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333
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334 static int
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335 structseq_contains(PyStructSequence *obj, PyObject *o)
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336 {
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337 PyObject *tup;
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338 int result;
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339 tup = make_tuple(obj);
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340 if (!tup)
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341 return -1;
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342 result = PySequence_Contains(tup, o);
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343 Py_DECREF(tup);
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344 return result;
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345 }
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346
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347 static long
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348 structseq_hash(PyObject *obj)
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349 {
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350 PyObject *tup;
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351 long result;
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352 tup = make_tuple((PyStructSequence*) obj);
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353 if (!tup)
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354 return -1;
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355 result = PyObject_Hash(tup);
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356 Py_DECREF(tup);
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357 return result;
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358 }
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359
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360 static PyObject *
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361 structseq_richcompare(PyObject *obj, PyObject *o2, int op)
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362 {
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363 PyObject *tup, *result;
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364 tup = make_tuple((PyStructSequence*) obj);
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365 result = PyObject_RichCompare(tup, o2, op);
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366 Py_DECREF(tup);
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367 return result;
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368 }
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369
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370 static PyObject *
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371 structseq_reduce(PyStructSequence* self)
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372 {
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373 PyObject* tup;
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374 PyObject* dict;
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375 PyObject* result;
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376 Py_ssize_t n_fields, n_visible_fields, n_unnamed_fields;
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377 int i;
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378
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379 n_fields = REAL_SIZE(self);
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380 n_visible_fields = VISIBLE_SIZE(self);
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381 n_unnamed_fields = UNNAMED_FIELDS(self);
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382 tup = PyTuple_New(n_visible_fields);
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383 if (!tup) {
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384 return NULL;
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385 }
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386
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387 dict = PyDict_New();
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388 if (!dict) {
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389 Py_DECREF(tup);
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390 return NULL;
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391 }
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392
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393 for (i = 0; i < n_visible_fields; i++) {
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394 Py_INCREF(self->ob_item[i]);
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395 PyTuple_SET_ITEM(tup, i, self->ob_item[i]);
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396 }
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397
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398 for (; i < n_fields; i++) {
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399 char *n = Py_TYPE(self)->tp_members[i-n_unnamed_fields].name;
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400 PyDict_SetItemString(dict, n,
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401 self->ob_item[i]);
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402 }
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403
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404 result = Py_BuildValue("(O(OO))", Py_TYPE(self), tup, dict);
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405
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406 Py_DECREF(tup);
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407 Py_DECREF(dict);
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408
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409 return result;
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410 }
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411
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412 static PySequenceMethods structseq_as_sequence = {
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413 (lenfunc)structseq_length,
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414 (binaryfunc)structseq_concat, /* sq_concat */
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415 (ssizeargfunc)structseq_repeat, /* sq_repeat */
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416 (ssizeargfunc)structseq_item, /* sq_item */
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417 0, /* sq_slice */
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418 0, /* sq_ass_item */
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419 0, /* sq_ass_slice */
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420 (objobjproc)structseq_contains, /* sq_contains */
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421 };
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422
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423 static PyMappingMethods structseq_as_mapping = {
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424 (lenfunc)structseq_length,
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425 (binaryfunc)structseq_subscript,
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426 };
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427
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428 static PyMethodDef structseq_methods[] = {
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429 {"__reduce__", (PyCFunction)structseq_reduce,
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430 METH_NOARGS, NULL},
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431 {NULL, NULL}
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432 };
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433
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434 static PyTypeObject _struct_sequence_template = {
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435 PyVarObject_HEAD_INIT(&PyType_Type, 0)
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436 NULL, /* tp_name */
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437 0, /* tp_basicsize */
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438 0, /* tp_itemsize */
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439 (destructor)structseq_dealloc, /* tp_dealloc */
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440 0, /* tp_print */
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441 0, /* tp_getattr */
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442 0, /* tp_setattr */
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443 0, /* tp_reserved */
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444 (reprfunc)structseq_repr, /* tp_repr */
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445 0, /* tp_as_number */
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446 &structseq_as_sequence, /* tp_as_sequence */
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447 &structseq_as_mapping, /* tp_as_mapping */
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448 structseq_hash, /* tp_hash */
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449 0, /* tp_call */
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450 0, /* tp_str */
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451 0, /* tp_getattro */
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452 0, /* tp_setattro */
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453 0, /* tp_as_buffer */
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454 Py_TPFLAGS_DEFAULT, /* tp_flags */
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455 NULL, /* tp_doc */
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456 0, /* tp_traverse */
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457 0, /* tp_clear */
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458 structseq_richcompare, /* tp_richcompare */
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459 0, /* tp_weaklistoffset */
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460 0, /* tp_iter */
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461 0, /* tp_iternext */
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462 structseq_methods, /* tp_methods */
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463 NULL, /* tp_members */
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464 0, /* tp_getset */
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465 0, /* tp_base */
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466 0, /* tp_dict */
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467 0, /* tp_descr_get */
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468 0, /* tp_descr_set */
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469 0, /* tp_dictoffset */
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470 0, /* tp_init */
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471 0, /* tp_alloc */
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472 structseq_new, /* tp_new */
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473 };
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474
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475 void
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476 PyStructSequence_InitType(PyTypeObject *type, PyStructSequence_Desc *desc)
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477 {
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478 PyObject *dict;
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479 PyMemberDef* members;
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480 int n_members, n_unnamed_members, i, k;
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481
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482 #ifdef Py_TRACE_REFS
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483 /* if the type object was chained, unchain it first
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484 before overwriting its storage */
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485 if (type->ob_base.ob_base._ob_next) {
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486 _Py_ForgetReference((PyObject*)type);
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487 }
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488 #endif
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489
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490 n_unnamed_members = 0;
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491 for (i = 0; desc->fields[i].name != NULL; ++i)
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492 if (desc->fields[i].name == PyStructSequence_UnnamedField)
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493 n_unnamed_members++;
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494 n_members = i;
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495
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496 memcpy(type, &_struct_sequence_template, sizeof(PyTypeObject));
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497 type->tp_name = desc->name;
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498 type->tp_doc = desc->doc;
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499 type->tp_basicsize = sizeof(PyStructSequence)+
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500 sizeof(PyObject*)*(n_members-1);
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501 type->tp_itemsize = 0;
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502
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503 members = PyMem_NEW(PyMemberDef, n_members-n_unnamed_members+1);
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504 if (members == NULL)
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505 return;
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506
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507 for (i = k = 0; i < n_members; ++i) {
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508 if (desc->fields[i].name == PyStructSequence_UnnamedField)
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509 continue;
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510 members[k].name = desc->fields[i].name;
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511 members[k].type = T_OBJECT;
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512 members[k].offset = offsetof(PyStructSequence, ob_item)
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513 + i * sizeof(PyObject*);
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514 members[k].flags = READONLY;
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515 members[k].doc = desc->fields[i].doc;
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516 k++;
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517 }
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518 members[k].name = NULL;
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519
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520 type->tp_members = members;
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521
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522 if (PyType_Ready(type) < 0)
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523 return;
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524 Py_INCREF(type);
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525
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526 dict = type->tp_dict;
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527 #define SET_DICT_FROM_INT(key, value) \
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528 do { \
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529 PyObject *v = PyLong_FromLong((long) value); \
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530 if (v != NULL) { \
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531 PyDict_SetItemString(dict, key, v); \
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532 Py_DECREF(v); \
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533 } \
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534 } while (0)
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parents: 48660
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535
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f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 51271
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536 SET_DICT_FROM_INT(visible_length_key, desc->n_in_sequence);
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 51271
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537 SET_DICT_FROM_INT(real_length_key, n_members);
f197407bdba2 Recorded merge of revisions 81032 via svnmerge from
Antoine Pitrou <solipsis@pitrou.net>
parents: 51271
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538 SET_DICT_FROM_INT(unnamed_fields_key, n_unnamed_members);
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ad2662095d77 Missing file structseq.c for SF patch #462296
Guido van Rossum <guido@python.org>
parents:
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539 }