prosody
0103dc8fa179
util/set.lua

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util/set.lua @ 6700:0103dc8fa179

mod_storage_xep0227: Return error from io.open if unable to open file for writing
author Kim Alvefur <zash@zash.se>
date Fri, 15 May 2015 15:25:59 +0200
parent 6675:cb5b56ddabfd
child 6777:5de6b93d0190
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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 module "set"
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14
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15 local set_mt = {};
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16 function set_mt.__call(set, _, k)
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17 return next(set._items, k);
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18 end
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19 function set_mt.__add(set1, set2)
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20 return _M.union(set1, set2);
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21 end
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22 function set_mt.__sub(set1, set2)
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23 return _M.difference(set1, set2);
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24 end
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25 function set_mt.__div(set, func)
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26 local new_set = _M.new();
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27 local items, new_items = set._items, new_set._items;
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28 for item in pairs(items) do
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29 local new_item = func(item);
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30 if new_item ~= nil then
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31 new_items[new_item] = true;
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32 end
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33 end
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34 return new_set;
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35 end
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36 function set_mt.__eq(set1, set2)
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37 set1, set2 = set1._items, set2._items;
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38 for item in pairs(set1) do
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39 if not set2[item] then
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40 return false;
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41 end
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42 end
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43
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44 for item in pairs(set2) do
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45 if not set1[item] then
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46 return false;
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47 end
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48 end
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49
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50 return true;
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51 end
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52 function set_mt.__tostring(set)
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53 local s, items = { }, set._items;
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54 for item in pairs(items) do
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55 s[#s+1] = tostring(item);
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56 end
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57 return t_concat(s, ", ");
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58 end
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59
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60 local items_mt = {};
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61 function items_mt.__call(items, _, k)
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62 return next(items, k);
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63 end
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64
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65 function new(list)
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66 local items = setmetatable({}, items_mt);
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67 local set = { _items = items };
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68
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69 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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70 --luacheck: ignore 212/self
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71
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72 function set:add(item)
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73 items[item] = true;
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74 end
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75
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76 function set:contains(item)
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77 return items[item];
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78 end
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79
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80 function set:items()
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81 return next, items;
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82 end
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83
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84 function set:remove(item)
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85 items[item] = nil;
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86 end
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87
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88 function set:add_list(item_list)
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89 if item_list then
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90 for _, item in ipairs(item_list) do
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91 items[item] = true;
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92 end
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93 end
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94 end
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95
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96 function set:include(otherset)
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97 for item in otherset do
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98 items[item] = true;
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99 end
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100 end
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101
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102 function set:exclude(otherset)
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103 for item in otherset do
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104 items[item] = nil;
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105 end
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106 end
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107
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108 function set:empty()
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109 return not next(items);
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110 end
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111
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112 if list then
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113 set:add_list(list);
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114 end
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115
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116 return setmetatable(set, set_mt);
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117 end
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118
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119 function union(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 for item in pairs(set1._items) do
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124 items[item] = true;
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125 end
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126
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127 for item in pairs(set2._items) do
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128 items[item] = true;
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129 end
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130
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131 return set;
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132 end
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133
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134 function difference(set1, set2)
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135 local set = new();
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136 local items = set._items;
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137
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138 for item in pairs(set1._items) do
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139 items[item] = (not set2._items[item]) or nil;
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140 end
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141
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142 return set;
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143 end
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144
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145 function intersection(set1, set2)
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146 local set = new();
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147 local items = set._items;
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148
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149 set1, set2 = set1._items, set2._items;
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150
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151 for item in pairs(set1) do
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152 items[item] = (not not set2[item]) or nil;
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153 end
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154
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155 return set;
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156 end
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157
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158 function xor(set1, set2)
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159 return union(set1, set2) - intersection(set1, set2);
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160 end
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161
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162 return _M;