Mon, 26 Oct 2009 02:41:08 +0000
Clear up the confusing key/value/name issue
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1 | ------------------------------------------------------------------------------- |
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2 | -- This module implements a function that traverses all live objects. |
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3 | -- You can implement your own function to pass as a parameter of traverse |
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4 | -- and give you the information you want. As an example we have implemented |
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5 | -- countreferences and findallpaths |
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6 | -- |
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7 | -- Alexandra Barros - 2006.03.15 |
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8 | ------------------------------------------------------------------------------- |
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9 | |
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10 | module("traverse", package.seeall) |
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11 | local traverse = _M; |
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12 | |
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13 | local List = {} |
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14 | |
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15 | function List.new () |
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16 | return {first = 0, last = -1} |
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17 | end |
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18 | |
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19 | function List.push (list, value) |
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20 | local last = list.last + 1 |
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21 | list.last = last |
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22 | list[last] = value |
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23 | end |
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24 | |
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25 | function List.pop (list) |
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26 | local first = list.first |
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27 | if first > list.last then error("list is empty") end |
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28 | local value = list[first] |
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29 | list[first] = nil |
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30 | list.first = first + 1 |
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31 | return value |
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32 | end |
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33 | |
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34 | function List.isempty (list) |
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35 | return list.first > list.last |
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36 | end |
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37 | |
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38 | -- Counts all references for a given object |
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39 | function countreferences(value) |
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40 | local count = -1 |
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41 | local f = function(from, to, how, v) |
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42 | if to == value then |
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43 | count = count + 1 |
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44 | end |
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45 | end |
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46 | traverse({edge=f}, {count, f}) |
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47 | return count |
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48 | end |
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49 | |
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50 | -- Main function |
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51 | -- 'funcs' is a table that contains a funcation for every lua type and also the |
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52 | -- function edge edge (traverseedge). |
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53 | function traverse(funcs, ignoreobjs) |
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54 | |
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55 | -- The keys of the marked table are the objetcts (for example, table: 00442330). |
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56 | -- The value of each key is true if the object has been found and false |
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57 | -- otherwise. |
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58 | local env = {marked = {}, list=List.new(), funcs=funcs} |
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59 | |
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60 | if ignoreobjs then |
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61 | for i=1, #ignoreobjs do |
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62 | env.marked[ignoreobjs[i]] = true |
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63 | end |
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64 | end |
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65 | |
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66 | env.marked["traverse"] = true |
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67 | env.marked[traverse] = true |
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68 | |
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69 | -- marks and inserts on the list |
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70 | edge(env, nil, "_G", "isname", nil) |
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71 | edge(env, nil, _G, "value", "_G") |
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72 | |
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73 | -- traverses the active thread |
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74 | -- inserts the local variables |
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75 | -- interates over the function on the stack, starting from the one that |
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76 | -- called traverse |
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77 | |
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78 | for i=2, math.huge do |
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79 | local info = debug.getinfo(i, "f") |
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80 | if not info then break end |
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81 | for j=1, math.huge do |
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82 | local n, v = debug.getlocal(i, j) |
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83 | if not n then break end |
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84 | |
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85 | edge(env, nil, n, "isname", nil) |
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86 | edge(env, nil, v, "local", n) |
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87 | end |
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88 | end |
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89 | |
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90 | while not List.isempty(env.list) do |
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91 | |
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92 | local obj = List.pop(env.list) |
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93 | local t = type(obj) |
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94 | traverse["traverse" .. t](env, obj) |
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95 | |
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96 | end |
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97 | |
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98 | end |
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99 | |
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100 | function traversetable(env, obj) |
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101 | |
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102 | local f = env.funcs.table |
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103 | if f then f(obj) end |
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104 | |
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105 | for key, value in pairs(obj) do |
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106 | edge(env, obj, key, "key", nil) |
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107 | edge(env, obj, value, "value", key) |
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108 | end |
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109 | |
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110 | local mtable = debug.getmetatable(obj) |
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111 | if mtable then edge(env, obj, mtable, "ismetatable", nil) end |
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112 | |
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113 | end |
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114 | |
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115 | function traversestring(env, obj) |
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116 | local f = env.funcs.string |
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117 | if f then f(obj) end |
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118 | |
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119 | end |
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120 | |
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121 | function traverseuserdata(env, obj) |
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122 | local f = env.funcs.userdata |
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123 | if f then f(obj) end |
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124 | |
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125 | local mtable = debug.getmetatable(obj) |
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126 | if mtable then edge(env, obj, mtable, "ismetatable", nil) end |
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127 | |
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128 | local fenv = debug.getfenv(obj) |
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129 | if fenv then edge(env, obj, fenv, "environment", nil) end |
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130 | |
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131 | end |
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132 | |
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133 | function traversefunction(env, obj) |
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134 | local f = env.funcs.func |
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135 | if f then f(obj) end |
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136 | |
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137 | -- gets the upvalues |
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138 | local i = 1 |
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139 | while true do |
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140 | local n, v = debug.getupvalue(obj, i) |
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141 | if not n then break end -- when there is no upvalues |
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142 | edge(env, obj, n, "isname", nil) |
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143 | edge(env, obj, v, "upvalue", n) |
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144 | i = i + 1 |
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145 | end |
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146 | |
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147 | local fenv = debug.getfenv(obj) |
5 | 148 | edge(env, obj, fenv, "environment", nil) |
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149 | |
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150 | end |
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151 | |
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152 | function traversethread(env, t) |
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153 | local f = env.funcs.thread |
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154 | if f then f(t) end |
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155 | |
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156 | for i=1, math.huge do |
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157 | local info = debug.getinfo(t, i, "f") |
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158 | if not info then break end |
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159 | for j=1, math.huge do |
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160 | local n, v = debug.getlocal(t, i , j) |
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161 | if not n then break end |
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162 | print(n, v) |
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163 | |
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164 | edge(env, nil, n, "isname", nil) |
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165 | edge(env, nil, v, "local", n) |
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166 | end |
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167 | end |
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168 | |
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169 | local fenv = debug.getfenv(t) |
5 | 170 | edge(env, t, fenv, "environment", nil) |
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171 | |
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172 | end |
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173 | |
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174 | |
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175 | -- 'how' is a string that identifies the content of 'to' and 'value': |
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176 | -- if 'how' is "key", then 'to' is a key and 'name' is nil. |
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177 | -- if 'how' is "value", then 'to' is an object and 'name' is the name of the |
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178 | -- key. |
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179 | function edge(env, from, to, how, name) |
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180 | |
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181 | local t = type(to) |
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182 | |
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183 | if to and (t~="boolean") and (t~="number") and (t~="new") then |
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184 | -- If the destination object has not been found yet |
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185 | if not env.marked[to] then |
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186 | env.marked[to] = true |
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187 | List.push(env.list, to) -- puts on the list to be traversed |
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188 | end |
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189 | |
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190 | local f = env.funcs.edge |
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191 | if f then f(from, to, how, name) end |
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192 | |
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193 | end |
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194 | end |
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195 | |
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196 | return _M; |