prosody
0769cc5f34b6
util/set.lua

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util/set.lua @ 3340:0769cc5f34b6

mod_posix: Truncate the pidfile before writing to ensure that we never overwrite with a PID shorter than the previous, and end with an invalid PID in the file.
author Brian Cully <bjc@junctionnetworks.com>
date Fri, 09 Jul 2010 01:16:09 +0100
parent 2923:b7049746bd29
child 3540:bc139431830b
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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, new_items = _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 if func(item) then
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30 new_items[item] = true;
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31 end
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32 end
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33 return new_set;
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34 end
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35 function set_mt.__eq(set1, set2)
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36 local set1, set2 = set1._items, set2._items;
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37 for item in pairs(set1) do
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38 if not set2[item] then
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39 return false;
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40 end
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41 end
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42
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43 for item in pairs(set2) do
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44 if not set1[item] then
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45 return false;
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46 end
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47 end
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48
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49 return true;
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50 end
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51 function set_mt.__tostring(set)
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52 local s, items = { }, set._items;
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53 for item in pairs(items) do
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54 s[#s+1] = tostring(item);
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55 end
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56 return t_concat(s, ", ");
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57 end
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58
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59 local items_mt = {};
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60 function items_mt.__call(items, _, k)
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61 return next(items, k);
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62 end
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63
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64 function new(list)
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65 local items = setmetatable({}, items_mt);
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66 local set = { _items = items };
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67
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68 function set:add(item)
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69 items[item] = true;
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70 end
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71
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72 function set:contains(item)
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73 return items[item];
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74 end
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75
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76 function set:items()
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77 return items;
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78 end
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79
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80 function set:remove(item)
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81 items[item] = nil;
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82 end
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83
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84 function set:add_list(list)
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85 for _, item in ipairs(list) do
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86 items[item] = true;
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87 end
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88 end
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89
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90 function set:include(otherset)
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91 for item in pairs(otherset) do
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92 items[item] = true;
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93 end
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94 end
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95
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96 function set:exclude(otherset)
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97 for item in pairs(otherset) do
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98 items[item] = nil;
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99 end
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100 end
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101
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102 function set:empty()
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103 return not next(items);
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104 end
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105
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106 if list then
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107 set:add_list(list);
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108 end
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109
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110 return setmetatable(set, set_mt);
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111 end
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112
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113 function union(set1, set2)
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114 local set = new();
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115 local items = set._items;
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116
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117 for item in pairs(set1._items) do
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118 items[item] = true;
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119 end
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120
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121 for item in pairs(set2._items) do
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122 items[item] = true;
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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 function difference(set1, set2)
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129 local set = new();
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130 local items = set._items;
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131
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132 for item in pairs(set1._items) do
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133 items[item] = (not set2._items[item]) or nil;
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134 end
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135
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136 return set;
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137 end
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138
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139 function intersection(set1, set2)
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140 local set = new();
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141 local items = set._items;
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142
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143 set1, set2 = set1._items, set2._items;
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144
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145 for item in pairs(set1) do
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146 items[item] = (not not set2[item]) or nil;
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147 end
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148
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149 return set;
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150 end
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151
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152 function xor(set1, set2)
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153 return union(set1, set2) - intersection(set1, set2);
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154 end
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155
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156 return _M;