prosody
eaaa8ca742a7
util/iterators.lua

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util/iterators.lua @ 11270:eaaa8ca742a7

mod_mam: Implement extended MAM metadata query
author Kim Alvefur <zash@zash.se>
date Mon, 30 Nov 2020 23:42:13 +0100
parent 9688:eade1316728e
child 12589:39ae08180c81
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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 --[[ Iterators ]]--
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10
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11 local it = {};
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12
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13 local t_insert = table.insert;
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14 local next = next;
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15 local unpack = table.unpack or unpack; --luacheck: ignore 113
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16 local pack = table.pack or require "util.table".pack;
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17 local type = type;
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18 local table, setmetatable = table, setmetatable;
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19
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20 local _ENV = nil;
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21 --luacheck: std none
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22
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23 -- Reverse an iterator
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24 function it.reverse(f, s, var)
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25 local results = {};
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26
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27 -- First call the normal iterator
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28 while true do
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29 local ret = { f(s, var) };
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30 var = ret[1];
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31 if var == nil then break; end
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32 t_insert(results, 1, ret);
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33 end
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34
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35 -- Then return our reverse one
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36 local i,max = 0, #results;
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37 return function (_results)
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38 if i<max then
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39 i = i + 1;
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40 return unpack(_results[i]);
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41 end
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42 end, results;
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43 end
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44
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45 -- Iterate only over keys in a table
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46 local function _keys_it(t, key)
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47 return (next(t, key));
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48 end
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49 function it.keys(t)
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50 return _keys_it, t;
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51 end
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52
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53 -- Iterate only over values in a table
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54 function it.values(t)
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55 local key, val;
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56 return function (_t)
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57 key, val = next(_t, key);
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58 return val;
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59 end, t;
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60 end
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61
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62 -- Iterate over the n:th return value
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63 function it.select(n, f, s, var)
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64 return function (_s)
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65 local ret = pack(f(_s, var));
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66 var = ret[1];
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67 return ret[n];
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68 end, s, var;
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69 end
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70
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71 -- Given an iterator, iterate only over unique items
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72 function it.unique(f, s, var)
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73 local set = {};
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74
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75 return function ()
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76 while true do
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77 local ret = pack(f(s, var));
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78 var = ret[1];
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79 if var == nil then break; end
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80 if not set[var] then
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81 set[var] = true;
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82 return unpack(ret, 1, ret.n);
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83 end
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84 end
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85 end;
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86 end
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87
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88 --[[ Return the number of items an iterator returns ]]--
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89 function it.count(f, s, var)
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90 local x = 0;
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91
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92 while true do
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93 var = f(s, var);
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94 if var == nil then break; end
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95 x = x + 1;
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96 end
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97
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98 return x;
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99 end
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100
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101 -- Return the first n items an iterator returns
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102 function it.head(n, f, s, var)
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103 local c = 0;
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104 return function (_s, _var)
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105 if c >= n then
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106 return nil;
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107 end
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108 c = c + 1;
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109 return f(_s, _var);
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110 end, s, var;
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111 end
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112
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113 -- Skip the first n items an iterator returns
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114 function it.skip(n, f, s, var)
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115 for _ = 1, n do
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116 var = f(s, var);
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117 end
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118 return f, s, var;
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119 end
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120
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121 -- Return the last n items an iterator returns
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122 function it.tail(n, f, s, var)
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123 local results, count = {}, 0;
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124 while true do
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125 local ret = pack(f(s, var));
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126 var = ret[1];
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127 if var == nil then break; end
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128 results[(count%n)+1] = ret;
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129 count = count + 1;
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130 end
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131
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132 if n > count then n = count; end
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133
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134 local pos = 0;
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135 return function ()
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136 pos = pos + 1;
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137 if pos > n then return nil; end
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138 local ret = results[((count-1+pos)%n)+1];
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139 return unpack(ret, 1, ret.n);
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140 end
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141 --return reverse(head(n, reverse(f, s, var))); -- !
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142 end
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143
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144 function it.filter(filter, f, s, var)
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145 if type(filter) ~= "function" then
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146 local filter_value = filter;
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147 function filter(x) return x ~= filter_value; end
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148 end
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149 return function (_s, _var)
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150 local ret;
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151 repeat ret = pack(f(_s, _var));
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152 _var = ret[1];
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153 until _var == nil or filter(unpack(ret, 1, ret.n));
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154 return unpack(ret, 1, ret.n);
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155 end, s, var;
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156 end
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157
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158 local function _ripairs_iter(t, key) if key > 1 then return key-1, t[key-1]; end end
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159 function it.ripairs(t)
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160 return _ripairs_iter, t, #t+1;
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161 end
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162
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163 local function _range_iter(max, curr) if curr < max then return curr + 1; end end
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164 function it.range(x, y)
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165 if not y then x, y = 1, x; end -- Default to 1..x if y not given
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166 return _range_iter, y, x-1;
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167 end
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168
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169 -- Convert the values returned by an iterator to an array
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170 function it.to_array(f, s, var)
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171 local t = {};
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172 while true do
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173 var = f(s, var);
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174 if var == nil then break; end
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175 t_insert(t, var);
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176 end
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177 return t;
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178 end
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179
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180 function it.sorted_pairs(t, sort_func)
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181 local keys = it.to_array(it.keys(t));
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182 table.sort(keys, sort_func);
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183 local i = 0;
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184 return function ()
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185 i = i + 1;
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186 local key = keys[i];
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187 if key ~= nil then
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188 return key, t[key];
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189 end
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190 end;
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191 end
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192
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193 -- Treat the return of an iterator as key,value pairs,
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194 -- and build a table
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195 function it.to_table(f, s, var)
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196 local t, var2 = {};
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197 while true do
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198 var, var2 = f(s, var);
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199 if var == nil then break; end
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200 t[var] = var2;
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201 end
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202 return t;
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203 end
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204
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205 local function _join_iter(j_s, j_var)
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206 local iterators, current_idx = j_s[1], j_s[2];
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207 local f, s, var = unpack(iterators[current_idx], 1, 3);
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208 if j_var ~= nil then
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209 var = j_var;
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210 end
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211 local ret = pack(f(s, var));
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212 local var1 = ret[1];
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213 if var1 == nil then
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214 -- End of this iterator, advance to next
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215 if current_idx == #iterators then
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216 -- No more iterators, return nil
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217 return;
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218 end
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219 j_s[2] = current_idx + 1;
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220 return _join_iter(j_s);
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221 end
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222 return unpack(ret, 1, ret.n);
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223 end
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224 local join_methods = {};
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225 local join_mt = {
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226 __index = join_methods;
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227 __call = function (t, s, var) --luacheck: ignore 212/t
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228 return _join_iter(s, var);
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229 end;
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230 };
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231
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232 function join_methods:append(f, s, var)
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233 table.insert(self, { f, s, var });
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234 return self, { self, 1 };
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235 end
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236
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237 function join_methods:prepend(f, s, var)
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238 table.insert(self, { f, s, var }, 1);
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239 return self, { self, 1 };
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240 end
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241
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242 function it.join(f, s, var)
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243 return setmetatable({ {f, s, var} }, join_mt);
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244 end
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245
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246 return it;