prosody
eca44e058eed
util/multitable.lua

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util/multitable.lua @ 13196:eca44e058eed

util.human.io: Use tail call in test to get correct line numbers This is probably not guaranteed to work and might vary with Lua version, but it's good enough for me to get accurate line numbers out of Busted that don't all point to the test() function.
author Kim Alvefur <zash@zash.se>
date Sun, 16 Jul 2023 18:42:58 +0200
parent 12589:39ae08180c81
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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;
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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 };