prosody
6c3cae9b96cb
util/set.lua

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util/set.lua @ 8033:6c3cae9b96cb

mod_storage_sql: Move SQL queries into multiline strings for readability [luacheck]
author Kim Alvefur <zash@zash.se>
date Sat, 01 Apr 2017 19:26:27 +0200
parent 6777:5de6b93d0190
child 8522:073e517a1487
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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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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 };