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1 | -- Prosody IM |
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2 | -- Copyright (C) 2008-2009 Matthew Wild |
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3 | -- Copyright (C) 2008-2009 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; |
904 | 12 | |
13 | module "set" | |
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 | |
904 | 64 | function new(list) |
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65 | local items = setmetatable({}, items_mt); |
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66 | local set = { _items = items }; |
904 | 67 | |
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68 | function set:add(item) |
904 | 69 | items[item] = true; |
70 | end | |
71 | ||
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72 | function set:contains(item) |
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73 | return items[item]; |
904 | 74 | end |
75 | ||
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76 | function set:items() |
904 | 77 | return items; |
78 | end | |
79 | ||
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80 | function set:remove(item) |
904 | 81 | items[item] = nil; |
82 | end | |
83 | ||
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84 | function set:add_list(list) |
904 | 85 | for _, item in ipairs(list) do |
86 | items[item] = true; | |
87 | end | |
88 | end | |
89 | ||
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90 | function set:include(otherset) |
904 | 91 | for item in pairs(otherset) do |
92 | items[item] = true; | |
93 | end | |
94 | end | |
95 | ||
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96 | function set:exclude(otherset) |
904 | 97 | for item in pairs(otherset) do |
98 | items[item] = nil; | |
99 | end | |
100 | end | |
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); |
904 | 111 | end |
112 | ||
113 | function union(set1, set2) | |
114 | local set = new(); | |
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115 | local items = set._items; |
904 | 116 | |
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117 | for item in pairs(set1._items) do |
904 | 118 | items[item] = true; |
119 | end | |
120 | ||
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121 | for item in pairs(set2._items) do |
904 | 122 | items[item] = true; |
123 | end | |
124 | ||
125 | return set; | |
126 | end | |
127 | ||
128 | function difference(set1, set2) | |
129 | local set = new(); | |
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130 | local items = set._items; |
904 | 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; |
904 | 134 | end |
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; |
904 | 147 | end |
148 | ||
149 | return set; | |
150 | end | |
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 |
a82268d507fc
util.set: Add set.xor() to get a set consisting of items not in both sets
Matthew Wild <mwild1@gmail.com>
parents:
1029
diff
changeset
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155 | |
904 | 156 | return _M; |