prosody
898554323338
util/multitable.lua

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util/multitable.lua @ 12314:898554323338

util.poll: Restructure to make adding additional system APIs easier
author Kim Alvefur <zash@zash.se>
date Wed, 23 Feb 2022 20:30:22 +0100
parent 9692:affcbccc1dff
child 12589:39ae08180c81
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1 -- Prosody IM
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b7049746bd29 Update copyright headers for 2010
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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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b1885732e979 GPL->MIT!
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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 select = select;
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10 local t_insert = table.insert;
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11 local pairs, next, type = pairs, next, type;
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12 local unpack = table.unpack or unpack; --luacheck: ignore 113
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13
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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 function get(self, ...)
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18 local t = self.data;
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19 for n = 1,select('#', ...) do
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20 t = t[select(n, ...)];
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21 if not t then break; end
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22 end
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23 return t;
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24 end
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25
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26 local function add(self, ...)
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27 local t = self.data;
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28 local count = select('#', ...);
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29 for n = 1,count-1 do
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30 local key = select(n, ...);
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31 local tab = t[key];
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32 if not tab then tab = {}; t[key] = tab; end
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33 t = tab;
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34 end
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35 t_insert(t, (select(count, ...)));
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36 end
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37
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38 local function set(self, ...)
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39 local t = self.data;
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40 local count = select('#', ...);
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41 for n = 1,count-2 do
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42 local key = select(n, ...);
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43 local tab = t[key];
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44 if not tab then tab = {}; t[key] = tab; end
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45 t = tab;
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46 end
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47 t[(select(count-1, ...))] = (select(count, ...));
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48 end
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49
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50 local function r(t, n, _end, ...)
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51 if t == nil then return; end
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52 local k = select(n, ...);
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53 if n == _end then
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54 t[k] = nil;
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55 return;
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56 end
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57 if k then
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58 local v = t[k];
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59 if v then
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60 r(v, n+1, _end, ...);
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61 if not next(v) then
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62 t[k] = nil;
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63 end
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64 end
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65 else
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66 for _,b in pairs(t) do
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67 r(b, n+1, _end, ...);
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68 if not next(b) then
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69 t[_] = nil;
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70 end
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71 end
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72 end
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73 end
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74
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75 local function remove(self, ...)
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76 local _end = select('#', ...);
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77 for n = _end,1 do
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78 if select(n, ...) then _end = n; break; end
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79 end
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80 r(self.data, 1, _end, ...);
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81 end
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82
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83
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84 local function s(t, n, results, _end, ...)
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85 if t == nil then return; end
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86 local k = select(n, ...);
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87 if n == _end then
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88 if k == nil then
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89 for _, v in pairs(t) do
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90 t_insert(results, v);
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91 end
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92 else
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93 t_insert(results, t[k]);
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94 end
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95 return;
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96 end
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97 if k then
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98 local v = t[k];
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99 if v then
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100 s(v, n+1, results, _end, ...);
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101 end
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102 else
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103 for _,b in pairs(t) do
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104 s(b, n+1, results, _end, ...);
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105 end
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106 end
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107 end
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108
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109 -- Search for keys, nil == wildcard
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110 local function search(self, ...)
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111 local _end = select('#', ...);
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112 for n = _end,1 do
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113 if select(n, ...) then _end = n; break; end
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114 end
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115 local results = {};
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116 s(self.data, 1, results, _end, ...);
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117 return results;
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118 end
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119
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120 -- Append results to an existing list
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121 local function search_add(self, results, ...)
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122 if not results then results = {}; end
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123 local _end = select('#', ...);
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124 for n = _end,1 do
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125 if select(n, ...) then _end = n; break; end
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126 end
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127 s(self.data, 1, results, _end, ...);
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128 return results;
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129 end
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130
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131 local function iter(self, ...)
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132 local query = { ... };
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133 local maxdepth = select("#", ...);
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134 local stack = { self.data };
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135 local keys = { };
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136 local function it(self) -- luacheck: ignore 432/self
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137 local depth = #stack;
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138 local key = next(stack[depth], keys[depth]);
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139 if key == nil then -- Go up the stack
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140 stack[depth], keys[depth] = nil, nil;
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141 if depth > 1 then
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142 return it(self);
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143 end
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144 return; -- The end
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145 else
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146 keys[depth] = key;
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147 end
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148 local value = stack[depth][key];
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149 if query[depth] == nil or key == query[depth] then
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150 if depth == maxdepth then -- Result
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151 local result = {}; -- Collect keys forming path to result
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152 for i = 1, depth do
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153 result[i] = keys[i];
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154 end
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155 result[depth+1] = value;
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156 return unpack(result, 1, depth+1);
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157 elseif type(value) == "table" then
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158 t_insert(stack, value); -- Descend
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159 end
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160 end
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161 return it(self);
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162 end;
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163 return it, self;
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164 end
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165
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166 local function new()
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167 return {
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168 data = {};
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169 get = get;
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170 add = add;
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171 set = set;
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172 remove = remove;
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173 search = search;
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174 search_add = search_add;
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175 iter = iter;
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176 };
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177 end
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178
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179 return {
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180 iter = iter;
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181 new = new;
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182 };