prosody
6c2c2fc4b8dd
util/multitable.lua

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util/multitable.lua @ 8502:6c2c2fc4b8dd

util.pubsub: Support a 'nodestore' for persisting nodes (same API as kv stores)
author Matthew Wild <mwild1@gmail.com>
date Fri, 02 Feb 2018 19:31:03 +0000
parent 8389:5d866eb8f18f
child 8555:4f0f5b49bb03
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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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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 113 143
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13
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14 local _ENV = nil;
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15
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16 local function get(self, ...)
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17 local t = self.data;
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18 for n = 1,select('#', ...) do
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19 t = t[select(n, ...)];
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20 if not t then break; end
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21 end
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22 return t;
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23 end
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24
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25 local function add(self, ...)
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26 local t = self.data;
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27 local count = select('#', ...);
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28 for n = 1,count-1 do
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29 local key = select(n, ...);
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30 local tab = t[key];
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31 if not tab then tab = {}; t[key] = tab; end
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32 t = tab;
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33 end
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34 t_insert(t, (select(count, ...)));
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35 end
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36
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37 local function set(self, ...)
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38 local t = self.data;
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39 local count = select('#', ...);
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40 for n = 1,count-2 do
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41 local key = select(n, ...);
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42 local tab = t[key];
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43 if not tab then tab = {}; t[key] = tab; end
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44 t = tab;
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45 end
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46 t[(select(count-1, ...))] = (select(count, ...));
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47 end
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48
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49 local function r(t, n, _end, ...)
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50 if t == nil then return; end
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51 local k = select(n, ...);
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52 if n == _end then
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53 t[k] = nil;
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54 return;
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55 end
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56 if k then
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57 local v = t[k];
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58 if v then
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59 r(v, n+1, _end, ...);
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60 if not next(v) then
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61 t[k] = nil;
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62 end
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63 end
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64 else
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65 for _,b in pairs(t) do
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66 r(b, n+1, _end, ...);
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67 if not next(b) then
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68 t[_] = nil;
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69 end
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70 end
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71 end
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72 end
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73
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74 local function remove(self, ...)
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75 local _end = select('#', ...);
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76 for n = _end,1 do
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77 if select(n, ...) then _end = n; break; end
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78 end
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79 r(self.data, 1, _end, ...);
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80 end
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81
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82
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83 local function s(t, n, results, _end, ...)
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84 if t == nil then return; end
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85 local k = select(n, ...);
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86 if n == _end then
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87 if k == nil then
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88 for _, v in pairs(t) do
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89 t_insert(results, v);
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90 end
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91 else
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92 t_insert(results, t[k]);
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93 end
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94 return;
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95 end
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96 if k then
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97 local v = t[k];
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98 if v then
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99 s(v, n+1, results, _end, ...);
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100 end
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101 else
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102 for _,b in pairs(t) do
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103 s(b, n+1, results, _end, ...);
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104 end
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105 end
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106 end
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107
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108 -- Search for keys, nil == wildcard
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109 local function search(self, ...)
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110 local _end = select('#', ...);
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111 for n = _end,1 do
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112 if select(n, ...) then _end = n; break; end
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113 end
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114 local results = {};
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115 s(self.data, 1, results, _end, ...);
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116 return results;
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117 end
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118
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119 -- Append results to an existing list
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120 local function search_add(self, results, ...)
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121 if not results then results = {}; end
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122 local _end = select('#', ...);
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123 for n = _end,1 do
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124 if select(n, ...) then _end = n; break; end
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125 end
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126 s(self.data, 1, results, _end, ...);
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127 return results;
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128 end
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129
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130 local function iter(self, ...)
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131 local query = { ... };
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132 local maxdepth = select("#", ...);
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133 local stack = { self.data };
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134 local keys = { };
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135 local function it(self) -- luacheck: ignore 432/self
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136 local depth = #stack;
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137 local key = next(stack[depth], keys[depth]);
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138 if key == nil then -- Go up the stack
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139 stack[depth], keys[depth] = nil, nil;
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140 if depth > 1 then
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141 return it(self);
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142 end
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143 return; -- The end
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144 else
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145 keys[depth] = key;
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146 end
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147 local value = stack[depth][key];
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148 if query[depth] == nil or key == query[depth] then
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149 if depth == maxdepth then -- Result
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150 local result = {}; -- Collect keys forming path to result
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151 for i = 1, depth do
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152 result[i] = keys[i];
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153 end
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154 result[depth+1] = value;
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155 return unpack(result, 1, depth+1);
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156 elseif type(value) == "table" then
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157 t_insert(stack, value); -- Descend
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158 end
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159 end
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160 return it(self);
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161 end;
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162 return it, self;
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163 end
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164
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165 local function new()
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166 return {
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167 data = {};
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168 get = get;
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169 add = add;
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170 set = set;
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171 remove = remove;
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172 search = search;
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173 search_add = search_add;
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174 iter = iter;
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175 };
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176 end
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177
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178 return {
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179 iter = iter;
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180 new = new;
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181 };