prosody
44c9cb4094bb
util/array.lua

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util/array.lua @ 11272:44c9cb4094bb

mod_mam: Add support for before-id and after-id fields
author Kim Alvefur <zash@zash.se>
date Sat, 09 Jan 2021 21:31:45 +0100
parent 10895:5777968301e8
child 11787:3ae6fa901a8b
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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 t_insert, t_sort, t_remove, t_concat
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10 = table.insert, table.sort, table.remove, table.concat;
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11
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12 local setmetatable = setmetatable;
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13 local getmetatable = getmetatable;
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14 local math_random = math.random;
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15 local math_floor = math.floor;
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16 local pairs, ipairs = pairs, ipairs;
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17 local tostring = tostring;
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18 local type = type;
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19
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20 local array = {};
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21 local array_base = {};
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22 local array_methods = {};
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23 local array_mt = {
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24 __index = array_methods;
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25 __name = "array";
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26 __tostring = function (self) return "{"..self:concat(", ").."}"; end;
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27 };
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28
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29 function array_mt:__freeze() return self; end
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30
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31 local function new_array(self, t, _s, _var)
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32 if type(t) == "function" then -- Assume iterator
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33 t = self.collect(t, _s, _var);
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34 end
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35 return setmetatable(t or {}, array_mt);
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36 end
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37
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38 function array_mt.__add(a1, a2)
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39 local res = new_array();
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40 return res:append(a1):append(a2);
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41 end
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42
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43 function array_mt.__eq(a, b)
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44 if getmetatable(a) ~= array_mt or getmetatable(b) ~= array_mt then
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45 -- Lua 5.3+ calls this if both operands are tables, even if metatables differ
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46 return false;
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47 end
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48 if #a == #b then
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49 for i = 1, #a do
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50 if a[i] ~= b[i] then
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51 return false;
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52 end
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53 end
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54 else
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55 return false;
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56 end
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57 return true;
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58 end
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59
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60 function array_mt.__div(a1, func)
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61 local a2 = new_array();
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62 local o = 0;
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63 for i = 1, #a1 do
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64 local new_value = func(a1[i]);
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65 if new_value ~= nil then
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66 o = o + 1;
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67 a2[o] = new_value;
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68 end
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69 end
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70 return a2;
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71 end
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72
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73 setmetatable(array, { __call = new_array });
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74
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75 -- Read-only methods
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76 function array_methods:random()
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77 return self[math_random(1, #self)];
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78 end
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79
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80 -- Return a random value excluding the one at idx
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81 function array_methods:random_other(idx)
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82 local max = #self;
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83 return self[((math.random(1, max-1)+(idx-1))%max)+1];
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84 end
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85
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86 -- These methods can be called two ways:
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87 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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88 -- existing_array:method([params, ...]) -- Transform existing array into result
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89 --
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90 function array_base.map(outa, ina, func)
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91 for k, v in ipairs(ina) do
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92 outa[k] = func(v);
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93 end
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94 return outa;
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95 end
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96
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97 function array_base.filter(outa, ina, func)
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98 local inplace, start_length = ina == outa, #ina;
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99 local write = 1;
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100 for read = 1, start_length do
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101 local v = ina[read];
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102 if func(v) then
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103 outa[write] = v;
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104 write = write + 1;
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105 end
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106 end
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107
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108 if inplace and write <= start_length then
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109 for i = write, start_length do
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110 outa[i] = nil;
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111 end
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112 end
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113
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114 return outa;
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115 end
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116
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117 function array_base.sort(outa, ina, ...)
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118 if ina ~= outa then
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119 outa:append(ina);
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120 end
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121 t_sort(outa, ...);
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122 return outa;
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123 end
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124
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125 function array_base.unique(outa, ina)
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126 local seen = {};
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127 return array_base.filter(outa, ina, function (item)
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128 if seen[item] then
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129 return false;
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130 else
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131 seen[item] = true;
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132 return true;
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133 end
ec7cab8e744d util.array: Add method for filtering out duplicate values
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134 end);
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
parents: 7976
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135 end
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
parents: 7976
diff changeset
136
10895
5777968301e8 util.array: pluck: Support default value to avoid holes
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137 function array_base.pluck(outa, ina, key, default)
7019
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138 for i = 1, #ina do
10895
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diff changeset
139 local v = ina[i][key];
5777968301e8 util.array: pluck: Support default value to avoid holes
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diff changeset
140 if v == nil then
5777968301e8 util.array: pluck: Support default value to avoid holes
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diff changeset
141 v = default;
5777968301e8 util.array: pluck: Support default value to avoid holes
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parents: 10592
diff changeset
142 end
5777968301e8 util.array: pluck: Support default value to avoid holes
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diff changeset
143 outa[i] = v;
4439
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Matthew Wild <mwild1@gmail.com>
parents: 4387
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144 end
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Matthew Wild <mwild1@gmail.com>
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145 return outa;
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Matthew Wild <mwild1@gmail.com>
parents: 4387
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146 end
1c8d2c0d02db util.array: Add pluck() method to pick a given property from each item
Matthew Wild <mwild1@gmail.com>
parents: 4387
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147
5857
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parents: 5776
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148 function array_base.reverse(outa, ina)
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149 local len = #ina;
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150 if ina == outa then
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151 local middle = math_floor(len/2);
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152 len = len + 1;
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153 local o; -- opposite
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154 for i = 1, middle do
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parents: 5776
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155 o = len - i;
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parents: 5776
diff changeset
156 outa[i], outa[o] = outa[o], outa[i];
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parents: 5776
diff changeset
157 end
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Kim Alvefur <zash@zash.se>
parents: 5776
diff changeset
158 else
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Kim Alvefur <zash@zash.se>
parents: 5776
diff changeset
159 local off = len + 1;
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parents: 5776
diff changeset
160 for i = 1, len do
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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diff changeset
161 outa[i] = ina[off - i];
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Kim Alvefur <zash@zash.se>
parents: 5776
diff changeset
162 end
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
Kim Alvefur <zash@zash.se>
parents: 5776
diff changeset
163 end
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parents: 5776
diff changeset
164 return outa;
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parents: 5776
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165 end
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
Kim Alvefur <zash@zash.se>
parents: 5776
diff changeset
166
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167 --- These methods only mutate the array
7700
0d70410efdcf util.array: Remove unused arguments [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7699
diff changeset
168 function array_methods:shuffle()
918
967edf874df7 util.array: New array library
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parents:
diff changeset
169 local len = #self;
7019
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Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
170 for i = 1, #self do
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
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diff changeset
171 local r = math_random(i, len);
918
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parents:
diff changeset
172 self[i], self[r] = self[r], self[i];
967edf874df7 util.array: New array library
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parents:
diff changeset
173 end
1372
3b13bb57002e util.array: Make array:reverse() and array:shuffle() return the array to allow chaining
Matthew Wild <mwild1@gmail.com>
parents: 1371
diff changeset
174 return self;
918
967edf874df7 util.array: New array library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
175 end
967edf874df7 util.array: New array library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
176
7699
9c40d0be2295 util.array: Rename arguments to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7020
diff changeset
177 function array_methods:append(ina)
9c40d0be2295 util.array: Rename arguments to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7020
diff changeset
178 local len, len2 = #self, #ina;
7019
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
179 for i = 1, len2 do
7699
9c40d0be2295 util.array: Rename arguments to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7020
diff changeset
180 self[len+i] = ina[i];
1371
9e45bdf55353 util.array: Add array:append() method, to append a new array to an existing one
Matthew Wild <mwild1@gmail.com>
parents: 1027
diff changeset
181 end
9e45bdf55353 util.array: Add array:append() method, to append a new array to an existing one
Matthew Wild <mwild1@gmail.com>
parents: 1027
diff changeset
182 return self;
9e45bdf55353 util.array: Add array:append() method, to append a new array to an existing one
Matthew Wild <mwild1@gmail.com>
parents: 1027
diff changeset
183 end
9e45bdf55353 util.array: Add array:append() method, to append a new array to an existing one
Matthew Wild <mwild1@gmail.com>
parents: 1027
diff changeset
184
4440
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
185 function array_methods:push(x)
4449
ca74d8ed1a15 util.array: Avoid globals.
Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
186 t_insert(self, x);
4448
d745f4c28294 util.array: Make array:push() chainable.
Waqas Hussain <waqas20@gmail.com>
parents: 4440
diff changeset
187 return self;
4440
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
188 end
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
189
7020
6ab9c691c4c6 util.array: Just use table.remove as array:pop()
Kim Alvefur <zash@zash.se>
parents: 7019
diff changeset
190 array_methods.pop = t_remove;
4440
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
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parents: 4439
diff changeset
191
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
192 function array_methods:concat(sep)
4449
ca74d8ed1a15 util.array: Avoid globals.
Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
193 return t_concat(array.map(self, tostring), sep);
4440
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
194 end
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
195
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
196 function array_methods:length()
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
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parents: 4439
diff changeset
197 return #self;
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
Matthew Wild <mwild1@gmail.com>
parents: 4439
diff changeset
198 end
1905
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
199
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
200 --- These methods always create a new array
1027
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
201 function array.collect(f, s, var)
4387
06161b0b83f2 util.array: Fix array.collect() for iterators that expect initial value of var to be preserved
Matthew Wild <mwild1@gmail.com>
parents: 3540
diff changeset
202 local t = {};
1027
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
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parents: 922
diff changeset
203 while true do
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
204 var = f(s, var);
7019
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
205 if var == nil then break; end
4449
ca74d8ed1a15 util.array: Avoid globals.
Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
206 t_insert(t, var);
1027
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
207 end
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
208 return setmetatable(t, array_mt);
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
209 end
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
210
1905
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
211 ---
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
212
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
213 -- Setup methods from array_base
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
214 for method, f in pairs(array_base) do
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
215 local base_method = f;
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
216 -- Setup global array method which makes new array
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
217 array[method] = function (old_a, ...)
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
218 local a = new_array();
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
219 return base_method(a, old_a, ...);
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
220 end
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
221 -- Setup per-array (mutating) method
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
222 array_methods[method] = function (self, ...)
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
223 return base_method(self, self, ...);
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
224 end
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
225 end
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
226
1027
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
diff changeset
227 return array;