prosody
0fe6a9a3676f
util/set.lua

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util/set.lua @ 11647:0fe6a9a3676f

util.format: Allow newlines but ensure following lines are indented This should a) prevent injection of text that looks like legitimate log lines and b) not mangle tracebacks.
author Kim Alvefur <zash@zash.se>
date Sat, 03 Jul 2021 04:29:25 +0200
parent 11560:3bbb1af92514
child 11788:1ceee8becb1a
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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 getmetatable = getmetatable;
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12 local t_concat = table.concat;
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14 local _ENV = nil;
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15 -- luacheck: std none
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16
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17 local set_mt = { __name = "set" };
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18 function set_mt.__call(set, _, k)
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19 return next(set._items, k);
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20 end
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21
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22 local items_mt = {};
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23 function items_mt.__call(items, _, k)
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24 return next(items, k);
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25 end
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26
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27 function set_mt:__freeze()
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28 local a, i = {}, 1;
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29 for item in self._items do
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30 a[i], i = item, i+1;
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31 end
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32 return a;
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33 end
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34
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35 local function is_set(o)
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36 local mt = getmetatable(o);
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37 return mt == set_mt;
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38 end
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39
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40 local function new(list)
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41 local items = setmetatable({}, items_mt);
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42 local set = { _items = items };
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43
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44 -- We access the set through an upvalue in these methods, so ignore 'self' being unused
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45 --luacheck: ignore 212/self
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46
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47 function set:add(item)
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48 items[item] = true;
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49 end
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50
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51 function set:contains(item)
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52 return items[item];
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53 end
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54
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55 function set:items()
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56 return next, items;
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57 end
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58
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59 function set:remove(item)
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60 items[item] = nil;
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61 end
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62
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63 function set:add_list(item_list)
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64 if item_list then
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65 for _, item in ipairs(item_list) do
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66 items[item] = true;
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67 end
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68 end
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69 end
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70
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71 function set:include(otherset)
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72 for item in otherset do
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73 items[item] = true;
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74 end
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75 end
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76
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77 function set:exclude(otherset)
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78 for item in otherset do
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79 items[item] = nil;
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80 end
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81 end
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82
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83 function set:empty()
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84 return not next(items);
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85 end
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86
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87 if list then
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88 set:add_list(list);
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89 end
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90
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91 return setmetatable(set, set_mt);
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92 end
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93
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94 local function union(set1, set2)
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95 local set = new();
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96 local items = set._items;
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97
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98 for item in pairs(set1._items) do
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99 items[item] = true;
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100 end
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101
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102 for item in pairs(set2._items) do
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103 items[item] = true;
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104 end
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105
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106 return set;
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107 end
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108
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109 local function difference(set1, set2)
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110 local set = new();
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111 local items = set._items;
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112
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113 for item in pairs(set1._items) do
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114 items[item] = (not set2._items[item]) or nil;
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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 local function intersection(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 set1, set2 = set1._items, set2._items;
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125
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126 for item in pairs(set1) do
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127 items[item] = (not not set2[item]) or nil;
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128 end
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129
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130 return set;
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131 end
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132
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133 local function xor(set1, set2)
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134 return union(set1, set2) - intersection(set1, set2);
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135 end
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136
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137 function set_mt.__add(set1, set2)
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138 return union(set1, set2);
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139 end
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140 function set_mt.__sub(set1, set2)
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141 return difference(set1, set2);
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142 end
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143 function set_mt.__div(set, func)
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144 local new_set = new();
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145 local items, new_items = set._items, new_set._items;
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146 for item in pairs(items) do
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147 local new_item = func(item);
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148 if new_item ~= nil then
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149 new_items[new_item] = true;
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150 end
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151 end
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152 return new_set;
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153 end
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154 function set_mt.__eq(set1, set2)
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155 if getmetatable(set1) ~= set_mt or getmetatable(set2) ~= set_mt then
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156 -- Lua 5.3+ calls this if both operands are tables, even if metatables differ
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157 return false;
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158 end
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159
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160 set1, set2 = set1._items, set2._items;
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161 for item in pairs(set1) do
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162 if not set2[item] then
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163 return false;
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164 end
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165 end
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166
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167 for item in pairs(set2) do
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168 if not set1[item] then
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169 return false;
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170 end
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171 end
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172
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173 return true;
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174 end
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175 function set_mt.__tostring(set)
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176 local s, items = { }, set._items;
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177 for item in pairs(items) do
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178 s[#s+1] = tostring(item);
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179 end
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180 return t_concat(s, ", ");
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181 end
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182
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183 return {
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184 new = new;
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185 is_set = is_set;
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186 union = union;
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187 difference = difference;
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188 intersection = intersection;
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189 xor = xor;
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190 };