Mercurial > cpython-lru_cache-weakref

annotate Modules/_sqlite/cache.c @ 37829:f048116aade0 legacy-trunk

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It's probably a good idea to actually *install* setuptools, too. ;)
author Phillip J. Eby <pje@telecommunity.com>
date Tue, 18 Apr 2006 04:34:50 +0000
parents d3969aeba777
children 7da4af95ebad
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1 /* cache .c - a LRU cache
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2 *
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3 * Copyright (C) 2004-2006 Gerhard Häring <gh@ghaering.de>
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4 *
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5 * This file is part of pysqlite.
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6 *
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7 * This software is provided 'as-is', without any express or implied
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8 * warranty. In no event will the authors be held liable for any damages
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9 * arising from the use of this software.
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10 *
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11 * Permission is granted to anyone to use this software for any purpose,
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12 * including commercial applications, and to alter it and redistribute it
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13 * freely, subject to the following restrictions:
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14 *
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15 * 1. The origin of this software must not be misrepresented; you must not
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16 * claim that you wrote the original software. If you use this software
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17 * in a product, an acknowledgment in the product documentation would be
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18 * appreciated but is not required.
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19 * 2. Altered source versions must be plainly marked as such, and must not be
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20 * misrepresented as being the original software.
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21 * 3. This notice may not be removed or altered from any source distribution.
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22 */
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23
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24 #include "cache.h"
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25
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26 /* only used internally */
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27 Node* new_node(PyObject* key, PyObject* data)
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28 {
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29 Node* node;
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30
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31 node = (Node*) (NodeType.tp_alloc(&NodeType, 0));
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32 if (!node) {
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33 return NULL;
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34 }
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35
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36 Py_INCREF(key);
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37 node->key = key;
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38
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39 Py_INCREF(data);
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40 node->data = data;
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41
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42 node->prev = NULL;
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43 node->next = NULL;
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44
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45 return node;
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46 }
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47
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48 void node_dealloc(Node* self)
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49 {
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50 Py_DECREF(self->key);
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51 Py_DECREF(self->data);
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52
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53 self->ob_type->tp_free((PyObject*)self);
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54 }
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55
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56 int cache_init(Cache* self, PyObject* args, PyObject* kwargs)
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57 {
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58 PyObject* factory;
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59 int size = 10;
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60
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61 self->factory = NULL;
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62
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63 if (!PyArg_ParseTuple(args, "O|i", &factory, &size))
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64 {
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65 return -1;
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66 }
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67
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68 if (size < 5) {
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69 size = 5;
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70 }
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71 self->size = size;
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72 self->first = NULL;
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73 self->last = NULL;
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74
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75 self->mapping = PyDict_New();
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76 if (!self->mapping) {
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77 return -1;
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78 }
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79
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80 Py_INCREF(factory);
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81 self->factory = factory;
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82
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83 self->decref_factory = 1;
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84
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85 return 0;
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86 }
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87
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88 void cache_dealloc(Cache* self)
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89 {
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90 Node* node;
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91 Node* delete_node;
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92
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93 if (!self->factory) {
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94 /* constructor failed, just get out of here */
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95 return;
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96 }
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97
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98 node = self->first;
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99 while (node) {
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100 delete_node = node;
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101 node = node->next;
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102 Py_DECREF(delete_node);
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103 }
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104
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105 if (self->decref_factory) {
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106 Py_DECREF(self->factory);
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107 }
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108 Py_DECREF(self->mapping);
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109
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110 self->ob_type->tp_free((PyObject*)self);
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111 }
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112
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113 PyObject* cache_get(Cache* self, PyObject* args)
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114 {
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115 PyObject* key = args;
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116 Node* node;
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117 Node* ptr;
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118 PyObject* data;
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119
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120 node = (Node*)PyDict_GetItem(self->mapping, key);
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121 if (node) {
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122 node->count++;
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123 if (node->prev && node->count > node->prev->count) {
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124 ptr = node->prev;
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125
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126 while (ptr->prev && node->count > ptr->prev->count) {
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127 ptr = ptr->prev;
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128 }
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129
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130 if (node->next) {
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131 node->next->prev = node->prev;
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132 } else {
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133 self->last = node->prev;
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134 }
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135 if (node->prev) {
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136 node->prev->next = node->next;
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137 }
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138 if (ptr->prev) {
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139 ptr->prev->next = node;
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140 } else {
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141 self->first = node;
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142 }
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143
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144 node->next = ptr;
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145 node->prev = ptr->prev;
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146 if (!node->prev) {
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147 self->first = node;
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148 }
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149 ptr->prev = node;
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150 }
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151 } else {
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152 if (PyDict_Size(self->mapping) == self->size) {
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153 if (self->last) {
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154 node = self->last;
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155
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156 if (PyDict_DelItem(self->mapping, self->last->key) != 0) {
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157 return NULL;
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158 }
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159
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160 if (node->prev) {
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161 node->prev->next = NULL;
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162 }
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163 self->last = node->prev;
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164 node->prev = NULL;
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165
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166 Py_DECREF(node);
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167 }
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168 }
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169
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170 data = PyObject_CallFunction(self->factory, "O", key);
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171
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172 if (!data) {
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173 return NULL;
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174 }
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175
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176 node = new_node(key, data);
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177 if (!node) {
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178 return NULL;
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179 }
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180 node->prev = self->last;
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181
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182 Py_DECREF(data);
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183
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184 if (PyDict_SetItem(self->mapping, key, (PyObject*)node) != 0) {
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185 Py_DECREF(node);
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186 return NULL;
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187 }
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188
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189 if (self->last) {
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190 self->last->next = node;
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191 } else {
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192 self->first = node;
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193 }
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194 self->last = node;
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195 }
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196
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197 Py_INCREF(node->data);
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198 return node->data;
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199 }
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200
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201 PyObject* cache_display(Cache* self, PyObject* args)
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202 {
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203 Node* ptr;
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204 PyObject* prevkey;
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205 PyObject* nextkey;
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206 PyObject* fmt_args;
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207 PyObject* template;
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208 PyObject* display_str;
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209
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210 ptr = self->first;
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211
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212 while (ptr) {
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213 if (ptr->prev) {
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214 prevkey = ptr->prev->key;
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215 } else {
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216 prevkey = Py_None;
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217 }
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218 Py_INCREF(prevkey);
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219
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220 if (ptr->next) {
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221 nextkey = ptr->next->key;
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222 } else {
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223 nextkey = Py_None;
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224 }
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225 Py_INCREF(nextkey);
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226
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227 fmt_args = Py_BuildValue("OOO", prevkey, ptr->key, nextkey);
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228 if (!fmt_args) {
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229 return NULL;
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230 }
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231 template = PyString_FromString("%s <- %s ->%s\n");
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232 if (!template) {
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233 return NULL;
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234 }
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235 display_str = PyString_Format(template, fmt_args);
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236 Py_DECREF(template);
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237 Py_DECREF(fmt_args);
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238 if (!display_str) {
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239 return NULL;
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240 }
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241 PyObject_Print(display_str, stdout, Py_PRINT_RAW);
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242 Py_DECREF(display_str);
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243
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244 Py_DECREF(prevkey);
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245 Py_DECREF(nextkey);
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246
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247 ptr = ptr->next;
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248 }
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249
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250 Py_INCREF(Py_None);
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251 return Py_None;
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252 }
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253
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254 static PyMethodDef cache_methods[] = {
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255 {"get", (PyCFunction)cache_get, METH_O,
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256 PyDoc_STR("Gets an entry from the cache.")},
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257 {"display", (PyCFunction)cache_display, METH_NOARGS,
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258 PyDoc_STR("For debugging only.")},
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259 {NULL, NULL}
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260 };
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261
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262 PyTypeObject NodeType = {
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263 PyObject_HEAD_INIT(NULL)
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264 0, /* ob_size */
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265 MODULE_NAME "Node", /* tp_name */
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266 sizeof(Node), /* tp_basicsize */
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267 0, /* tp_itemsize */
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268 (destructor)node_dealloc, /* tp_dealloc */
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269 0, /* tp_print */
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270 0, /* tp_getattr */
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271 0, /* tp_setattr */
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272 0, /* tp_compare */
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273 0, /* tp_repr */
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274 0, /* tp_as_number */
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275 0, /* tp_as_sequence */
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276 0, /* tp_as_mapping */
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277 0, /* tp_hash */
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278 0, /* tp_call */
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279 0, /* tp_str */
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280 0, /* tp_getattro */
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281 0, /* tp_setattro */
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282 0, /* tp_as_buffer */
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283 Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
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284 0, /* tp_doc */
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285 0, /* tp_traverse */
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286 0, /* tp_clear */
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287 0, /* tp_richcompare */
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288 0, /* tp_weaklistoffset */
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289 0, /* tp_iter */
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290 0, /* tp_iternext */
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291 0, /* tp_methods */
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292 0, /* tp_members */
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293 0, /* tp_getset */
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294 0, /* tp_base */
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295 0, /* tp_dict */
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296 0, /* tp_descr_get */
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297 0, /* tp_descr_set */
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298 0, /* tp_dictoffset */
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299 (initproc)0, /* tp_init */
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300 0, /* tp_alloc */
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301 0, /* tp_new */
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302 0 /* tp_free */
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303 };
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304
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305 PyTypeObject CacheType = {
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306 PyObject_HEAD_INIT(NULL)
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307 0, /* ob_size */
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308 MODULE_NAME ".Cache", /* tp_name */
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309 sizeof(Cache), /* tp_basicsize */
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310 0, /* tp_itemsize */
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311 (destructor)cache_dealloc, /* tp_dealloc */
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312 0, /* tp_print */
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313 0, /* tp_getattr */
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314 0, /* tp_setattr */
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315 0, /* tp_compare */
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316 0, /* tp_repr */
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317 0, /* tp_as_number */
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318 0, /* tp_as_sequence */
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319 0, /* tp_as_mapping */
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320 0, /* tp_hash */
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321 0, /* tp_call */
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322 0, /* tp_str */
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323 0, /* tp_getattro */
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324 0, /* tp_setattro */
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325 0, /* tp_as_buffer */
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326 Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
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327 0, /* tp_doc */
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328 0, /* tp_traverse */
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329 0, /* tp_clear */
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330 0, /* tp_richcompare */
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331 0, /* tp_weaklistoffset */
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332 0, /* tp_iter */
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333 0, /* tp_iternext */
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334 cache_methods, /* tp_methods */
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335 0, /* tp_members */
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336 0, /* tp_getset */
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337 0, /* tp_base */
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338 0, /* tp_dict */
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339 0, /* tp_descr_get */
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340 0, /* tp_descr_set */
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341 0, /* tp_dictoffset */
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342 (initproc)cache_init, /* tp_init */
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343 0, /* tp_alloc */
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344 0, /* tp_new */
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345 0 /* tp_free */
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346 };
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347
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348 extern int cache_setup_types(void)
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349 {
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350 int rc;
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351
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352 NodeType.tp_new = PyType_GenericNew;
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353 CacheType.tp_new = PyType_GenericNew;
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354
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355 rc = PyType_Ready(&NodeType);
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356 if (rc < 0) {
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357 return rc;
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358 }
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359
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360 rc = PyType_Ready(&CacheType);
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361 return rc;
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362 }