prosody
13d5fb74648f
util/set.lua

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util/set.lua @ 10594:13d5fb74648f

util.set: Fix equality metamethod in Lua 5.3
author Kim Alvefur <zash@zash.se>
date Wed, 15 Jan 2020 21:18:30 +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, setmetatable, next, tostring =
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10 ipairs, pairs, setmetatable, next, tostring;
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11 local getmetatable = getmetatable;
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12 local t_concat = table.concat;
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13
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14 local _ENV = nil;
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15 -- luacheck: std none
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16
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17 local set_mt = { __name = "set" };
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18 function set_mt.__call(set, _, k)
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19 return next(set._items, k);
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20 end
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21
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22 local items_mt = {};
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23 function items_mt.__call(items, _, k)
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24 return next(items, k);
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25 end
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26
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27 function set_mt:__freeze()
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28 local a, i = {}, 1;
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29 for item in self._items do
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30 a[i], i = item, i+1;
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31 end
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32 return a;
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33 end
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34
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35 local function new(list)
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36 local items = setmetatable({}, items_mt);
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37 local set = { _items = items };
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38
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39 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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40 --luacheck: ignore 212/self
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41
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42 function set:add(item)
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43 items[item] = true;
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44 end
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45
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46 function set:contains(item)
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47 return items[item];
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48 end
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49
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50 function set:items()
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51 return next, items;
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52 end
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53
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54 function set:remove(item)
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55 items[item] = nil;
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56 end
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57
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58 function set:add_list(item_list)
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59 if item_list then
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60 for _, item in ipairs(item_list) do
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61 items[item] = true;
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62 end
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63 end
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64 end
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65
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66 function set:include(otherset)
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67 for item in otherset do
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68 items[item] = true;
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69 end
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70 end
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71
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72 function set:exclude(otherset)
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73 for item in otherset do
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74 items[item] = nil;
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75 end
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76 end
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77
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78 function set:empty()
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79 return not next(items);
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80 end
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81
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82 if list then
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83 set:add_list(list);
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84 end
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85
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86 return setmetatable(set, set_mt);
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87 end
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88
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89 local function union(set1, set2)
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90 local set = new();
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91 local items = set._items;
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92
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93 for item in pairs(set1._items) do
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94 items[item] = true;
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95 end
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96
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97 for item in pairs(set2._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 return set;
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102 end
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103
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104 local function difference(set1, set2)
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105 local set = new();
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106 local items = set._items;
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107
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108 for item in pairs(set1._items) do
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109 items[item] = (not set2._items[item]) or nil;
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110 end
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111
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112 return set;
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113 end
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114
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115 local function intersection(set1, set2)
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116 local set = new();
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117 local items = set._items;
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118
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119 set1, set2 = set1._items, set2._items;
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120
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121 for item in pairs(set1) do
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122 items[item] = (not not set2[item]) or nil;
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123 end
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124
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125 return set;
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126 end
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127
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128 local function xor(set1, set2)
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129 return union(set1, set2) - intersection(set1, set2);
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130 end
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131
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132 function set_mt.__add(set1, set2)
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133 return union(set1, set2);
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134 end
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135 function set_mt.__sub(set1, set2)
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136 return difference(set1, set2);
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137 end
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138 function set_mt.__div(set, func)
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139 local new_set = new();
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140 local items, new_items = set._items, new_set._items;
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141 for item in pairs(items) do
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142 local new_item = func(item);
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143 if new_item ~= nil then
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144 new_items[new_item] = true;
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145 end
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146 end
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147 return new_set;
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148 end
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149 function set_mt.__eq(set1, set2)
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150 if getmetatable(set1) ~= set_mt or getmetatable(set2) ~= set_mt then
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151 -- Lua 5.3+ calls this if both operands are tables, even if metatables differ
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152 return false;
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153 end
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154
6777
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155 set1, set2 = set1._items, set2._items;
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156 for item in pairs(set1) do
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157 if not set2[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 for item in pairs(set2) do
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163 if not set1[item] then
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164 return false;
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165 end
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166 end
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167
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168 return true;
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169 end
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170 function set_mt.__tostring(set)
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171 local s, items = { }, set._items;
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172 for item in pairs(items) do
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173 s[#s+1] = tostring(item);
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174 end
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175 return t_concat(s, ", ");
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176 end
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177
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178 return {
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179 new = new;
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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 };