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util/set.lua @ 5862:7e83c8448cd6
util.sasl: Make registerMechanism a public function (again)
author | Waqas Hussain <waqas20@gmail.com> |
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date | Mon, 07 Oct 2013 17:57:06 -0400 |
parent | 5817:6e087f3b8f3b |
child | 5908:081a91507e4f |
rev | line source |
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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; |
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 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 |
904 | 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) |
904 | 70 items[item] = true; |
71 end | |
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72 |
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73 function set:contains(item) |
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74 return items[item]; |
904 | 75 end |
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76 |
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77 function set:items() |
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78 return next, items; |
904 | 79 end |
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80 |
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81 function set:remove(item) |
904 | 82 items[item] = nil; |
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 |
904 | 90 end |
91 end | |
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92 |
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93 function set:include(otherset) |
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94 for item in otherset do |
904 | 95 items[item] = true; |
96 end | |
97 end | |
98 | |
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99 function set:exclude(otherset) |
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100 for item in otherset do |
904 | 101 items[item] = nil; |
102 end | |
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); |
904 | 114 end |
115 | |
116 function union(set1, set2) | |
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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122 end | |
123 | |
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124 for item in pairs(set2._items) do |
904 | 125 items[item] = true; |
126 end | |
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127 |
904 | 128 return set; |
129 end | |
130 | |
131 function difference(set1, set2) | |
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; |
904 | 137 end |
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; |
904 | 150 end |
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151 |
904 | 152 return set; |
153 end | |
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 |
904 | 159 return _M; |