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util/set.lua @ 8852:5e98d62f3f9b
MUC: Ignore unused argumens [luacheck]
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 20 Oct 2017 05:45:03 +0200 |
parent | 8555:4f0f5b49bb03 |
child | 9488:a96a2fbcc6c0 |
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 |
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13 local _ENV = nil; |
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14 -- luacheck: std none |
904 | 15 |
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16 local set_mt = { __name = "set" }; |
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17 function set_mt.__call(set, _, k) |
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18 return next(set._items, k); |
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19 end |
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20 |
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21 local items_mt = {}; |
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22 function items_mt.__call(items, _, k) |
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23 return next(items, k); |
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24 end |
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25 |
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26 local function new(list) |
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27 local items = setmetatable({}, items_mt); |
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28 local set = { _items = items }; |
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29 |
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30 -- We access the set through an upvalue in these methods, so ignore 'self' being unused |
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31 --luacheck: ignore 212/self |
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32 |
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33 function set:add(item) |
904 | 34 items[item] = true; |
35 end | |
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36 |
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37 function set:contains(item) |
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38 return items[item]; |
904 | 39 end |
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40 |
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41 function set:items() |
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42 return next, items; |
904 | 43 end |
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44 |
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45 function set:remove(item) |
904 | 46 items[item] = nil; |
47 end | |
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48 |
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49 function set:add_list(item_list) |
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50 if item_list then |
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51 for _, item in ipairs(item_list) do |
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52 items[item] = true; |
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53 end |
904 | 54 end |
55 end | |
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56 |
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57 function set:include(otherset) |
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58 for item in otherset do |
904 | 59 items[item] = true; |
60 end | |
61 end | |
62 | |
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63 function set:exclude(otherset) |
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64 for item in otherset do |
904 | 65 items[item] = nil; |
66 end | |
67 end | |
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68 |
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69 function set:empty() |
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70 return not next(items); |
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71 end |
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72 |
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73 if list then |
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74 set:add_list(list); |
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75 end |
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76 |
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77 return setmetatable(set, set_mt); |
904 | 78 end |
79 | |
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80 local function union(set1, set2) |
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82 local items = set._items; |
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83 |
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84 for item in pairs(set1._items) do |
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86 end | |
87 | |
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88 for item in pairs(set2._items) do |
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90 end | |
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91 |
904 | 92 return set; |
93 end | |
94 | |
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95 local function difference(set1, set2) |
904 | 96 local set = new(); |
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97 local items = set._items; |
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98 |
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99 for item in pairs(set1._items) do |
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100 items[item] = (not set2._items[item]) or nil; |
904 | 101 end |
102 | |
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103 return set; |
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104 end |
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105 |
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106 local function intersection(set1, set2) |
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107 local set = new(); |
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108 local items = set._items; |
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109 |
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110 set1, set2 = set1._items, set2._items; |
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111 |
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112 for item in pairs(set1) do |
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113 items[item] = (not not set2[item]) or nil; |
904 | 114 end |
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115 |
904 | 116 return set; |
117 end | |
118 | |
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119 local function xor(set1, set2) |
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120 return union(set1, set2) - intersection(set1, set2); |
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121 end |
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122 |
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123 function set_mt.__add(set1, set2) |
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124 return union(set1, set2); |
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125 end |
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126 function set_mt.__sub(set1, set2) |
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127 return difference(set1, set2); |
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128 end |
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129 function set_mt.__div(set, func) |
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130 local new_set = new(); |
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131 local items, new_items = set._items, new_set._items; |
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132 for item in pairs(items) do |
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133 local new_item = func(item); |
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134 if new_item ~= nil then |
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135 new_items[new_item] = true; |
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136 end |
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137 end |
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138 return new_set; |
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139 end |
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140 function set_mt.__eq(set1, set2) |
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141 set1, set2 = set1._items, set2._items; |
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142 for item in pairs(set1) do |
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143 if not set2[item] then |
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144 return false; |
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145 end |
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146 end |
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147 |
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148 for item in pairs(set2) do |
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149 if not set1[item] then |
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150 return false; |
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151 end |
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152 end |
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153 |
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154 return true; |
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155 end |
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156 function set_mt.__tostring(set) |
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157 local s, items = { }, set._items; |
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158 for item in pairs(items) do |
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159 s[#s+1] = tostring(item); |
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160 end |
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161 return t_concat(s, ", "); |
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162 end |
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163 |
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164 return { |
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165 new = new; |
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166 union = union; |
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167 difference = difference; |
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168 intersection = intersection; |
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169 xor = xor; |
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170 }; |