prosody
495de404a8ae
util/set.lua

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util/set.lua @ 7567:495de404a8ae

ejabberdsql2prosody: rename variable 'host' to prevent shadowing upvalue [luacheck] Functions roster(), roster_pending(), roster_group(), private_storage() and offline_msg() have argument named "host", which used to shadow upvalue of this variable before this change. Instead of renaming this argument, let's rename the variable to match what the script says in usage: Usage: ejabberdsql2prosody.lua filename.txt hostname
author Anton Shestakov <av6@dwimlabs.net>
date Fri, 12 Aug 2016 13:44:47 +0800
parent 6777:5de6b93d0190
child 8522:073e517a1487
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local ipairs, pairs, setmetatable, next, tostring =
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10 ipairs, pairs, setmetatable, next, tostring;
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11 local t_concat = table.concat;
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13 local _ENV = nil;
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14
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15 local set_mt = {};
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16 function set_mt.__call(set, _, k)
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17 return next(set._items, k);
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18 end
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19
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20 local items_mt = {};
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21 function items_mt.__call(items, _, k)
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22 return next(items, k);
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23 end
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24
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25 local function new(list)
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26 local items = setmetatable({}, items_mt);
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27 local set = { _items = items };
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29 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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30 --luacheck: ignore 212/self
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31
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32 function set:add(item)
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33 items[item] = true;
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34 end
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35
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36 function set:contains(item)
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37 return items[item];
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38 end
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39
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40 function set:items()
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41 return next, items;
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42 end
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43
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44 function set:remove(item)
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45 items[item] = nil;
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46 end
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47
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48 function set:add_list(item_list)
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49 if item_list then
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50 for _, item in ipairs(item_list) do
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51 items[item] = true;
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52 end
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53 end
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54 end
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55
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56 function set:include(otherset)
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57 for item in otherset do
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58 items[item] = true;
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59 end
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60 end
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61
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62 function set:exclude(otherset)
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63 for item in otherset do
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64 items[item] = nil;
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65 end
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66 end
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67
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68 function set:empty()
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69 return not next(items);
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70 end
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71
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72 if list then
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73 set:add_list(list);
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74 end
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75
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76 return setmetatable(set, set_mt);
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77 end
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78
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79 local function union(set1, set2)
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80 local set = new();
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81 local items = set._items;
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82
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83 for item in pairs(set1._items) do
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84 items[item] = true;
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85 end
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86
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87 for item in pairs(set2._items) do
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88 items[item] = true;
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89 end
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90
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91 return set;
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92 end
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93
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94 local function difference(set1, set2)
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95 local set = new();
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96 local items = set._items;
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97
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98 for item in pairs(set1._items) do
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99 items[item] = (not set2._items[item]) or nil;
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100 end
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101
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102 return set;
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103 end
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104
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105 local function intersection(set1, set2)
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106 local set = new();
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107 local items = set._items;
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108
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109 set1, set2 = set1._items, set2._items;
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110
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111 for item in pairs(set1) do
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112 items[item] = (not not set2[item]) or nil;
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113 end
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114
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115 return set;
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116 end
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117
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118 local function xor(set1, set2)
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119 return union(set1, set2) - intersection(set1, set2);
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120 end
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121
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122 function set_mt.__add(set1, set2)
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123 return union(set1, set2);
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124 end
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125 function set_mt.__sub(set1, set2)
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126 return difference(set1, set2);
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127 end
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128 function set_mt.__div(set, func)
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129 local new_set = new();
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130 local items, new_items = set._items, new_set._items;
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131 for item in pairs(items) do
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132 local new_item = func(item);
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133 if new_item ~= nil then
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134 new_items[new_item] = true;
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135 end
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136 end
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137 return new_set;
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138 end
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139 function set_mt.__eq(set1, set2)
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140 set1, set2 = set1._items, set2._items;
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141 for item in pairs(set1) do
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142 if not set2[item] then
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143 return false;
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144 end
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145 end
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146
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147 for item in pairs(set2) do
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148 if not set1[item] then
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149 return false;
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150 end
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151 end
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152
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153 return true;
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154 end
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155 function set_mt.__tostring(set)
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156 local s, items = { }, set._items;
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157 for item in pairs(items) do
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158 s[#s+1] = tostring(item);
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159 end
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160 return t_concat(s, ", ");
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161 end
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162
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163 return {
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164 new = new;
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165 union = union;
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166 difference = difference;
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167 intersection = intersection;
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168 xor = xor;
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169 };