prosody
18c0ca5fcbb8
util/set.lua

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util/set.lua @ 11988:18c0ca5fcbb8

mod_mam: Switch to new cron API
author Kim Alvefur <zash@zash.se>
date Sun, 21 Nov 2021 18:16:03 +0100
parent 11788:1ceee8becb1a
child 12986:895a82c5d8d4
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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 is_set(o)
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36 local mt = getmetatable(o);
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37 return mt == set_mt;
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38 end
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39
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40 local function new(list)
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41 local items = setmetatable({}, items_mt);
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42 local set = { _items = items };
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43
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44 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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45 --luacheck: ignore 212/self
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46
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47 function set:add(item)
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48 items[item] = true;
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49 end
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50
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51 function set:contains(item)
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52 return items[item];
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53 end
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54
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55 function set:contains_set(other_set)
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56 for item in other_set do
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57 if not self:contains(item) then
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58 return false;
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59 end
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60 end
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61 return true;
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62 end
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63
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64 function set:items()
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65 return next, items;
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66 end
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67
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68 function set:remove(item)
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69 items[item] = nil;
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70 end
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71
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72 function set:add_list(item_list)
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73 if item_list then
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74 for _, item in ipairs(item_list) do
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75 items[item] = true;
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76 end
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77 end
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78 end
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79
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80 function set:include(otherset)
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81 for item in otherset do
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82 items[item] = true;
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83 end
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84 end
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85
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86 function set:exclude(otherset)
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87 for item in otherset do
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88 items[item] = nil;
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89 end
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90 end
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91
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92 function set:empty()
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93 return not next(items);
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94 end
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95
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96 if list then
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97 set:add_list(list);
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98 end
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99
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100 return setmetatable(set, set_mt);
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101 end
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102
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103 local function union(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] = true;
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109 end
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110
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111 for item in pairs(set2._items) do
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112 items[item] = true;
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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 difference(set1, set2)
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119 local set = new();
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120 local items = set._items;
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121
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122 for item in pairs(set1._items) do
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123 items[item] = (not set2._items[item]) or nil;
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124 end
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125
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126 return set;
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127 end
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128
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129 local function intersection(set1, set2)
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130 local set = new();
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131 local items = set._items;
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132
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133 set1, set2 = set1._items, set2._items;
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134
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135 for item in pairs(set1) do
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136 items[item] = (not not set2[item]) or nil;
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137 end
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138
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139 return set;
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140 end
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141
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142 local function xor(set1, set2)
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143 return union(set1, set2) - intersection(set1, set2);
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144 end
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145
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146 function set_mt.__add(set1, set2)
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147 return union(set1, set2);
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148 end
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149 function set_mt.__sub(set1, set2)
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150 return difference(set1, set2);
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151 end
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152 function set_mt.__div(set, func)
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153 local new_set = new();
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154 local items, new_items = set._items, new_set._items;
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155 for item in pairs(items) do
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156 local new_item = func(item);
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157 if new_item ~= nil then
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158 new_items[new_item] = true;
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159 end
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160 end
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161 return new_set;
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162 end
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163 function set_mt.__eq(set1, set2)
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164 if getmetatable(set1) ~= set_mt or getmetatable(set2) ~= set_mt then
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165 -- Lua 5.3+ calls this if both operands are tables, even if metatables differ
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166 return false;
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167 end
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168
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169 set1, set2 = set1._items, set2._items;
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170 for item in pairs(set1) do
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171 if not set2[item] then
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172 return false;
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173 end
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174 end
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175
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176 for item in pairs(set2) do
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177 if not set1[item] then
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178 return false;
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179 end
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180 end
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181
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182 return true;
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183 end
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184 function set_mt.__tostring(set)
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185 local s, items = { }, set._items;
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186 for item in pairs(items) do
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187 s[#s+1] = tostring(item);
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188 end
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189 return t_concat(s, ", ");
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190 end
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191
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192 return {
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193 new = new;
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194 is_set = is_set;
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195 union = union;
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196 difference = difference;
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197 intersection = intersection;
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198 xor = xor;
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199 };