prosody
7df29c5fbb9b
util/set.lua

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util/set.lua @ 9217:7df29c5fbb9b

util.stanza + tests: Bail out of loop if we are iterating too far, fixes #981
author Matthew Wild <mwild1@gmail.com>
date Sun, 19 Aug 2018 21:56:33 +0100
parent 8555:4f0f5b49bb03
child 9488:a96a2fbcc6c0
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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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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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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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parents: 6675
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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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parents: 6675
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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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parents: 6675
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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 };