prosody
77f900bbbf25
util/set.lua

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util/set.lua @ 10226:77f900bbbf25

Remove COMPAT with temporary luasec fork The changes in the temporary fork were merged into mainline luasec ca 2013 and included in the 0.5 release in 2014.
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 23:12:55 +0200
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 };