prosody
feaef6215bb8
util/set.lua

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util/set.lua @ 9307:feaef6215bb8

util.stanza: Don't automatically generate ids for iq stanzas Users of this API should provide their own id attribute that meets their uniqueness requirements. The current implementation leaks information (i.e. how many iq stanzas have been sent by the server to other JIDs). Providing any strong guarantees of randomness here would need to pull in additional dependencies that we don't want in this simple library.
author Matthew Wild <mwild1@gmail.com>
date Thu, 13 Sep 2018 16:35:48 +0100
parent 8555:4f0f5b49bb03
child 9488:a96a2fbcc6c0
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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 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 local function new(list)
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27 local items = setmetatable({}, items_mt);
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28 local set = { _items = items };
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29
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30 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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31 --luacheck: ignore 212/self
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32
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33 function set:add(item)
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34 items[item] = true;
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35 end
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36
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37 function set:contains(item)
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38 return items[item];
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39 end
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40
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41 function set:items()
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42 return next, items;
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43 end
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44
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45 function set:remove(item)
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46 items[item] = nil;
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47 end
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48
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49 function set:add_list(item_list)
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50 if item_list then
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51 for _, item in ipairs(item_list) do
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52 items[item] = true;
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53 end
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54 end
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55 end
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56
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57 function set:include(otherset)
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58 for item in otherset do
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59 items[item] = true;
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60 end
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61 end
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62
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63 function set:exclude(otherset)
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64 for item in otherset do
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65 items[item] = nil;
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66 end
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67 end
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68
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69 function set:empty()
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70 return not next(items);
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71 end
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72
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73 if list then
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74 set:add_list(list);
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75 end
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76
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77 return setmetatable(set, set_mt);
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78 end
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79
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80 local function union(set1, set2)
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81 local set = new();
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82 local items = set._items;
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83
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84 for item in pairs(set1._items) do
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85 items[item] = true;
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86 end
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87
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88 for item in pairs(set2._items) do
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89 items[item] = true;
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90 end
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91
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92 return set;
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93 end
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94
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95 local function difference(set1, set2)
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96 local set = new();
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97 local items = set._items;
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98
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99 for item in pairs(set1._items) do
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100 items[item] = (not set2._items[item]) or nil;
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101 end
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102
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103 return set;
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104 end
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105
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106 local function intersection(set1, set2)
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107 local set = new();
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108 local items = set._items;
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109
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110 set1, set2 = set1._items, set2._items;
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111
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112 for item in pairs(set1) do
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113 items[item] = (not not set2[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 xor(set1, set2)
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120 return union(set1, set2) - intersection(set1, set2);
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121 end
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122
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123 function set_mt.__add(set1, set2)
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124 return union(set1, set2);
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125 end
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126 function set_mt.__sub(set1, set2)
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127 return difference(set1, set2);
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128 end
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129 function set_mt.__div(set, func)
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130 local new_set = new();
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131 local items, new_items = set._items, new_set._items;
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132 for item in pairs(items) do
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133 local new_item = func(item);
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134 if new_item ~= nil then
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135 new_items[new_item] = true;
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136 end
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137 end
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138 return new_set;
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139 end
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140 function set_mt.__eq(set1, set2)
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141 set1, set2 = set1._items, set2._items;
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142 for item in pairs(set1) do
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143 if not set2[item] then
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144 return false;
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145 end
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146 end
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147
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148 for item in pairs(set2) do
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149 if not set1[item] then
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150 return false;
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151 end
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152 end
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153
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154 return true;
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155 end
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156 function set_mt.__tostring(set)
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157 local s, items = { }, set._items;
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158 for item in pairs(items) do
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159 s[#s+1] = tostring(item);
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160 end
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161 return t_concat(s, ", ");
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162 end
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163
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164 return {
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165 new = new;
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166 union = union;
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167 difference = difference;
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168 intersection = intersection;
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169 xor = xor;
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170 };