prosody
d5360307a99d
util/set.lua

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util/set.lua @ 11568:d5360307a99d

mod_http_file_share: Handle out of bounds Range request Turns out you can seek past the end of the file without getting an error. Also rejects empty range instead of sending the whole file.
author Kim Alvefur <zash@zash.se>
date Mon, 17 May 2021 14:14:25 +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 };