prosody
c358537c0878
util/set.lua

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util/set.lua @ 11542:c358537c0878 0.11

util.set: Add is_set() to test if an object is a set
author Matthew Wild <mwild1@gmail.com>
date Mon, 10 May 2021 16:41:56 +0100
parent 9488:a96a2fbcc6c0
child 11560:3bbb1af92514
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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, getmetatable, setmetatable, next, tostring =
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10 ipairs, pairs, getmetatable, 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 is_set(o)
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35 local mt = getmetatable(o);
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36 return mt == set_mt;
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37 end
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38
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39 local function new(list)
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40 local items = setmetatable({}, items_mt);
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41 local set = { _items = items };
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42
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43 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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44 --luacheck: ignore 212/self
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45
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46 function set:add(item)
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47 items[item] = true;
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48 end
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49
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50 function set:contains(item)
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51 return items[item];
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52 end
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53
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54 function set:items()
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55 return next, items;
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56 end
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57
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58 function set:remove(item)
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59 items[item] = nil;
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60 end
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61
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62 function set:add_list(item_list)
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63 if item_list then
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64 for _, item in ipairs(item_list) do
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65 items[item] = true;
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66 end
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67 end
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68 end
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69
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70 function set:include(otherset)
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71 for item in otherset do
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72 items[item] = true;
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73 end
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74 end
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75
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76 function set:exclude(otherset)
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77 for item in otherset do
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78 items[item] = nil;
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79 end
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80 end
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81
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82 function set:empty()
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83 return not next(items);
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84 end
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85
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86 if list then
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87 set:add_list(list);
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88 end
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89
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90 return setmetatable(set, set_mt);
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91 end
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92
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93 local function union(set1, set2)
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94 local set = new();
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95 local items = set._items;
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96
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97 for item in pairs(set1._items) do
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98 items[item] = true;
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99 end
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100
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101 for item in pairs(set2._items) do
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102 items[item] = true;
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103 end
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104
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105 return set;
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106 end
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107
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108 local function difference(set1, set2)
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109 local set = new();
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110 local items = set._items;
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111
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112 for item in pairs(set1._items) do
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113 items[item] = (not set2._items[item]) or nil;
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114 end
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115
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116 return set;
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117 end
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118
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119 local function intersection(set1, set2)
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120 local set = new();
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121 local items = set._items;
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122
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123 set1, set2 = set1._items, set2._items;
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124
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125 for item in pairs(set1) do
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126 items[item] = (not not set2[item]) or nil;
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127 end
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128
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129 return set;
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130 end
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131
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132 local function xor(set1, set2)
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133 return union(set1, set2) - intersection(set1, set2);
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134 end
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135
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136 function set_mt.__add(set1, set2)
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137 return union(set1, set2);
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138 end
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139 function set_mt.__sub(set1, set2)
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140 return difference(set1, set2);
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141 end
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142 function set_mt.__div(set, func)
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143 local new_set = new();
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144 local items, new_items = set._items, new_set._items;
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145 for item in pairs(items) do
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146 local new_item = func(item);
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147 if new_item ~= nil then
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148 new_items[new_item] = true;
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149 end
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150 end
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151 return new_set;
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152 end
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153 function set_mt.__eq(set1, set2)
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154 set1, set2 = set1._items, set2._items;
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155 for item in pairs(set1) do
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156 if not set2[item] then
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157 return false;
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158 end
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159 end
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160
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161 for item in pairs(set2) do
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162 if not set1[item] then
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163 return false;
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164 end
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165 end
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166
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167 return true;
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168 end
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169 function set_mt.__tostring(set)
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170 local s, items = { }, set._items;
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171 for item in pairs(items) do
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172 s[#s+1] = tostring(item);
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173 end
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174 return t_concat(s, ", ");
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175 end
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176
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177 return {
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178 new = new;
11542
c358537c0878 util.set: Add is_set() to test if an object is a set
Matthew Wild <mwild1@gmail.com>
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179 is_set = is_set;
6777
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180 union = union;
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181 difference = difference;
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182 intersection = intersection;
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183 xor = xor;
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184 };