Mercurial > cpython-lru_cache-weakref

annotate Objects/methodobject.c @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 65d2d8e67da3
children d1447950fa04
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* Method object implementation */
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33
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34 #include "allobjects.h"
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35
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36 #include "token.h"
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37
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38 typedef struct {
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39 OB_HEAD
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40 struct methodlist *m_ml;
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41 object *m_self;
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42 } methodobject;
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43
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44 object *
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45 newmethodobject(ml, self)
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46 struct methodlist *ml;
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47 object *self;
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48 {
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49 methodobject *op = NEWOBJ(methodobject, &Methodtype);
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50 if (op != NULL) {
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51 op->m_ml = ml;
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52 XINCREF(self);
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53 op->m_self = self;
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54 }
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55 return (object *)op;
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56 }
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57
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58 method
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59 getmethod(op)
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60 object *op;
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61 {
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62 if (!is_methodobject(op)) {
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63 err_badcall();
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64 return NULL;
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65 }
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66 return ((methodobject *)op) -> m_ml -> ml_meth;
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67 }
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68
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69 object *
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70 getself(op)
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71 object *op;
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72 {
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73 if (!is_methodobject(op)) {
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74 err_badcall();
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75 return NULL;
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76 }
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77 return ((methodobject *)op) -> m_self;
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78 }
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79
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80 int
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81 getflags(op)
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82 object *op;
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83 {
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84 if (!is_methodobject(op)) {
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85 err_badcall();
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86 return -1;
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87 }
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88 return ((methodobject *)op) -> m_ml -> ml_flags;
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89 }
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90
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91 /* Methods (the standard built-in methods, that is) */
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92
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93 static void
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94 meth_dealloc(m)
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95 methodobject *m;
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96 {
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97 XDECREF(m->m_self);
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98 free((char *)m);
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99 }
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100
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101 static object *
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102 meth_getattr(m, name)
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103 methodobject *m;
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104 char *name;
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105 {
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106 if (strcmp(name, "__name__") == 0) {
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107 return newstringobject(m->m_ml->ml_name);
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108 }
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109 if (strcmp(name, "__doc__") == 0) {
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110 char *doc = m->m_ml->ml_doc;
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111 if (doc != NULL)
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112 return newstringobject(doc);
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113 INCREF(None);
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114 return None;
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115 }
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116 if (strcmp(name, "__self__") == 0) {
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117 object *self;
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118 if (getrestricted()) {
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119 err_setstr(RuntimeError,
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120 "method.__self__ not accessible in restricted mode");
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121 return NULL;
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122 }
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123 self = m->m_self;
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124 if (self == NULL)
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125 self = None;
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126 INCREF(self);
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127 return self;
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128 }
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129 if (strcmp(name, "__members__") == 0) {
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130 return mkvalue("[sss]", "__doc__", "__name__", "__self__");
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131 }
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132 err_setstr(AttributeError, name);
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133 return NULL;
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134 }
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135
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136 static object *
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137 meth_repr(m)
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138 methodobject *m;
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139 {
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140 char buf[200];
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141 if (m->m_self == NULL)
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142 sprintf(buf, "<built-in function %.80s>", m->m_ml->ml_name);
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143 else
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144 sprintf(buf,
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145 "<built-in method %.80s of %.80s object at %lx>",
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146 m->m_ml->ml_name, m->m_self->ob_type->tp_name,
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147 (long)m->m_self);
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148 return newstringobject(buf);
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149 }
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150
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151 static int
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152 meth_compare(a, b)
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153 methodobject *a, *b;
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154 {
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155 if (a->m_self != b->m_self)
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156 return cmpobject(a->m_self, b->m_self);
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157 if (a->m_ml->ml_meth == b->m_ml->ml_meth)
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158 return 0;
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159 if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
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160 return -1;
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161 else
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162 return 1;
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163 }
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164
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165 static long
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166 meth_hash(a)
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167 methodobject *a;
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168 {
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169 long x;
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170 if (a->m_self == NULL)
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171 x = 0;
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172 else {
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173 x = hashobject(a->m_self);
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174 if (x == -1)
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175 return -1;
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176 }
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177 return x ^ (long) a->m_ml->ml_meth;
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178 }
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179
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180 typeobject Methodtype = {
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181 OB_HEAD_INIT(&Typetype)
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182 0,
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183 "builtin_function_or_method",
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184 sizeof(methodobject),
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185 0,
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186 (destructor)meth_dealloc, /*tp_dealloc*/
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187 0, /*tp_print*/
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188 (getattrfunc)meth_getattr, /*tp_getattr*/
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189 0, /*tp_setattr*/
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190 (cmpfunc)meth_compare, /*tp_compare*/
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191 (reprfunc)meth_repr, /*tp_repr*/
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192 0, /*tp_as_number*/
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193 0, /*tp_as_sequence*/
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194 0, /*tp_as_mapping*/
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195 (hashfunc)meth_hash, /*tp_hash*/
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196 };
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197
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198 /* List all methods in a chain -- helper for findmethodinchain */
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199
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200 static object *
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201 listmethodchain(chain)
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202 struct methodchain *chain;
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203 {
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204 struct methodchain *c;
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205 struct methodlist *ml;
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206 int i, n;
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207 object *v;
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208
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209 n = 0;
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210 for (c = chain; c != NULL; c = c->link) {
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211 for (ml = c->methods; ml->ml_name != NULL; ml++)
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212 n++;
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213 }
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214 v = newlistobject(n);
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215 if (v == NULL)
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216 return NULL;
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217 i = 0;
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218 for (c = chain; c != NULL; c = c->link) {
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219 for (ml = c->methods; ml->ml_name != NULL; ml++) {
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220 setlistitem(v, i, newstringobject(ml->ml_name));
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221 i++;
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222 }
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223 }
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224 if (err_occurred()) {
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225 DECREF(v);
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226 return NULL;
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227 }
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228 sortlist(v);
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229 return v;
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230 }
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231
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232 /* Find a method in a method chain */
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233
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234 object *
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235 findmethodinchain(chain, self, name)
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236 struct methodchain *chain;
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237 object *self;
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238 char *name;
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239 {
395
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240 if (strcmp(name, "__methods__") == 0)
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241 return listmethodchain(chain);
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242 while (chain != NULL) {
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243 struct methodlist *ml = chain->methods;
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244 for (; ml->ml_name != NULL; ml++) {
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245 if (name[0] == ml->ml_name[0] &&
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246 strcmp(name+1, ml->ml_name+1) == 0)
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247 return newmethodobject(ml, self);
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248 }
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249 chain = chain->link;
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250 }
472
1d4b0339b83d Use AttributeError.
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251 err_setstr(AttributeError, name);
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252 return NULL;
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253 }
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254
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255 /* Find a method in a single method list */
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256
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257 object *
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258 findmethod(methods, self, name)
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259 struct methodlist *methods;
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260 object *self;
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261 char *name;
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262 {
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263 struct methodchain chain;
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264 chain.methods = methods;
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265 chain.link = NULL;
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266 return findmethodinchain(&chain, self, name);
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267 }