prosody
69f810014853
util/set.lua

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util/set.lua @ 9887:69f810014853

mod_storage_memory: Add support for archive item limits
author Kim Alvefur <zash@zash.se>
date Wed, 20 Mar 2019 12:14:45 +0100
parent 9488:a96a2fbcc6c0
child 10594:13d5fb74648f
child 11542:c358537c0878
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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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12
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13 local _ENV = nil;
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14 -- luacheck: std none
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15
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16 local set_mt = { __name = "set" };
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17 function set_mt.__call(set, _, k)
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18 return next(set._items, k);
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19 end
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20
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21 local items_mt = {};
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22 function items_mt.__call(items, _, k)
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23 return next(items, k);
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24 end
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25
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26 function set_mt:__freeze()
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27 local a, i = {}, 1;
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28 for item in self._items do
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29 a[i], i = item, i+1;
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30 end
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31 return a;
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32 end
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33
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34 local function new(list)
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35 local items = setmetatable({}, items_mt);
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36 local set = { _items = items };
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37
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38 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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39 --luacheck: ignore 212/self
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40
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41 function set:add(item)
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42 items[item] = true;
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43 end
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44
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45 function set:contains(item)
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46 return items[item];
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47 end
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48
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49 function set:items()
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50 return next, items;
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51 end
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52
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53 function set:remove(item)
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54 items[item] = nil;
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55 end
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56
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57 function set:add_list(item_list)
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58 if item_list then
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59 for _, item in ipairs(item_list) do
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60 items[item] = true;
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61 end
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62 end
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63 end
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64
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65 function set:include(otherset)
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66 for item in otherset do
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67 items[item] = true;
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68 end
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69 end
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70
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71 function set:exclude(otherset)
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72 for item in otherset do
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73 items[item] = nil;
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74 end
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75 end
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76
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77 function set:empty()
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78 return not next(items);
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79 end
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80
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81 if list then
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82 set:add_list(list);
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83 end
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84
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85 return setmetatable(set, set_mt);
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86 end
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87
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88 local function union(set1, set2)
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89 local set = new();
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90 local items = set._items;
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91
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92 for item in pairs(set1._items) do
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93 items[item] = true;
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94 end
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95
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96 for item in pairs(set2._items) do
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97 items[item] = true;
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98 end
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99
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100 return set;
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101 end
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102
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103 local function difference(set1, set2)
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104 local set = new();
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105 local items = set._items;
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106
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107 for item in pairs(set1._items) do
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108 items[item] = (not set2._items[item]) or nil;
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109 end
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110
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111 return set;
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112 end
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113
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114 local function intersection(set1, set2)
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115 local set = new();
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116 local items = set._items;
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117
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118 set1, set2 = set1._items, set2._items;
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119
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120 for item in pairs(set1) do
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121 items[item] = (not not set2[item]) or nil;
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122 end
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123
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124 return set;
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125 end
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126
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127 local function xor(set1, set2)
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128 return union(set1, set2) - intersection(set1, set2);
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129 end
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130
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131 function set_mt.__add(set1, set2)
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132 return union(set1, set2);
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133 end
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134 function set_mt.__sub(set1, set2)
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135 return difference(set1, set2);
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136 end
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137 function set_mt.__div(set, func)
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138 local new_set = new();
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139 local items, new_items = set._items, new_set._items;
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140 for item in pairs(items) do
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141 local new_item = func(item);
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142 if new_item ~= nil then
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143 new_items[new_item] = true;
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144 end
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145 end
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146 return new_set;
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147 end
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148 function set_mt.__eq(set1, set2)
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149 set1, set2 = set1._items, set2._items;
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150 for item in pairs(set1) do
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151 if not set2[item] then
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152 return false;
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153 end
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154 end
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155
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156 for item in pairs(set2) do
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157 if not set1[item] then
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158 return false;
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159 end
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160 end
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161
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162 return true;
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163 end
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164 function set_mt.__tostring(set)
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165 local s, items = { }, set._items;
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166 for item in pairs(items) do
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167 s[#s+1] = tostring(item);
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168 end
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169 return t_concat(s, ", ");
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170 end
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171
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172 return {
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173 new = new;
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174 union = union;
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175 difference = difference;
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176 intersection = intersection;
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177 xor = xor;
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178 };