prosody
8c5b5ebaacb0
util/set.lua

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util/set.lua @ 4908:8c5b5ebaacb0

util.set: Change '/' operator from filter to map+filter (nil to drop from set, false is a valid item). No code found which depends on current behaviour.
author Matthew Wild <mwild1@gmail.com>
date Thu, 24 May 2012 18:51:18 +0100
parent 4544:316e2b09a562
child 5776:bd0ff8ae98a8
child 5813:c888f548876b
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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 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 local 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 function set:add(item)
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70 items[item] = true;
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71 end
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72
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73 function set:contains(item)
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74 return items[item];
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75 end
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76
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77 function set:items()
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78 return items;
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79 end
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80
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81 function set:remove(item)
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82 items[item] = nil;
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83 end
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84
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85 function set:add_list(list)
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86 if list then
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87 for _, item in ipairs(list) do
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88 items[item] = true;
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89 end
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90 end
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91 end
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92
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93 function set:include(otherset)
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94 for item in pairs(otherset) do
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95 items[item] = true;
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96 end
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97 end
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98
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99 function set:exclude(otherset)
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100 for item in pairs(otherset) do
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101 items[item] = nil;
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102 end
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103 end
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104
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105 function set:empty()
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106 return not next(items);
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107 end
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108
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109 if list then
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110 set:add_list(list);
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111 end
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112
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113 return setmetatable(set, set_mt);
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114 end
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115
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116 function union(set1, set2)
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117 local set = new();
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118 local items = set._items;
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119
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120 for item in pairs(set1._items) do
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121 items[item] = true;
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122 end
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123
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124 for item in pairs(set2._items) do
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125 items[item] = true;
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126 end
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127
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128 return set;
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129 end
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130
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131 function difference(set1, set2)
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132 local set = new();
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133 local items = set._items;
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134
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135 for item in pairs(set1._items) do
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136 items[item] = (not set2._items[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 function intersection(set1, set2)
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143 local set = new();
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144 local items = set._items;
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145
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146 set1, set2 = set1._items, set2._items;
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147
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148 for item in pairs(set1) do
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149 items[item] = (not not set2[item]) or nil;
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150 end
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151
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152 return set;
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153 end
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154
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155 function xor(set1, set2)
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156 return union(set1, set2) - intersection(set1, set2);
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157 end
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158
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159 return _M;