prosody
063036ac82b7
util/set.lua

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util/set.lua @ 1121:063036ac82b7

Merge with 0.4
author Matthew Wild <mwild1@gmail.com>
date Tue, 05 May 2009 16:17:40 +0100
parent 1030:a82268d507fc
child 1522:569d58d21612
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rev   line source
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1 local ipairs, pairs, setmetatable, next, tostring =
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2 ipairs, pairs, setmetatable, next, tostring;
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3 local t_concat = table.concat;
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4
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5 module "set"
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6
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7 local set_mt = {};
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8 function set_mt.__call(set, _, k)
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9 return next(set._items, k);
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10 end
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11 function set_mt.__add(set1, set2)
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12 return _M.union(set1, set2);
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13 end
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14 function set_mt.__sub(set1, set2)
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15 return _M.difference(set1, set2);
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16 end
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17 function set_mt.__div(set, func)
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18 local new_set, new_items = _M.new();
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19 local items, new_items = set._items, new_set._items;
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20 for item in pairs(items) do
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21 if func(item) then
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22 new_items[item] = true;
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23 end
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24 end
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25 return new_set;
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26 end
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27 function set_mt.__eq(set1, set2)
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28 local set1, set2 = set1._items, set2._items;
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29 for item in pairs(set1) do
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30 if not set2[item] then
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31 return false;
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32 end
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33 end
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34
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35 for item in pairs(set2) do
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36 if not set1[item] then
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37 return false;
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38 end
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39 end
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40
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41 return true;
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42 end
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43 function set_mt.__tostring(set)
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44 local s, items = { }, set._items;
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45 for item in pairs(items) do
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46 s[#s+1] = tostring(item);
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47 end
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48 return t_concat(s, ", ");
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49 end
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50
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51 local items_mt = {};
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52 function items_mt.__call(items, _, k)
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53 return next(items, k);
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54 end
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55
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56 function new(list)
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57 local items = setmetatable({}, items_mt);
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58 local set = { _items = items };
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59
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60 function set:add(item)
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61 items[item] = true;
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62 end
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63
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64 function set:contains(item)
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65 return items[item];
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66 end
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67
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68 function set:items()
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69 return items;
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70 end
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71
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72 function set:remove(item)
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73 items[item] = nil;
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74 end
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75
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76 function set:add_list(list)
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77 for _, item in ipairs(list) do
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78 items[item] = true;
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79 end
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80 end
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81
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82 function set:include(otherset)
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83 for item in pairs(otherset) do
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84 items[item] = true;
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85 end
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86 end
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87
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88 function set:exclude(otherset)
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89 for item in pairs(otherset) do
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90 items[item] = nil;
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91 end
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92 end
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93
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94 function set:empty()
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95 return not next(items);
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96 end
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97
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98 if list then
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99 set:add_list(list);
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100 end
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101
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102 return setmetatable(set, set_mt);
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103 end
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104
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105 function union(set1, set2)
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106 local set = new();
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107 local items = set._items;
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108
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109 for item in pairs(set1._items) do
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110 items[item] = true;
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111 end
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112
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113 for item in pairs(set2._items) do
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114 items[item] = true;
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115 end
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116
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117 return set;
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118 end
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119
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120 function difference(set1, set2)
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121 local set = new();
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122 local items = set._items;
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123
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124 for item in pairs(set1._items) do
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125 items[item] = (not set2._items[item]) or nil;
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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 intersection(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 set1, set2 = set1._items, set2._items;
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136
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137 for item in pairs(set1) do
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138 items[item] = (not not set2[item]) or nil;
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139 end
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140
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141 return set;
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142 end
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143
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144 function xor(set1, set2)
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145 return union(set1, set2) - intersection(set1, set2);
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146 end
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147
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148 return _M;