prosody
42b2713ab818
util/array.lua

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util/array.lua @ 12403:42b2713ab818

util.array: Take advantage of table.move()
author Matthew Wild <mwild1@gmail.com>
date Fri, 18 Mar 2022 15:22:00 +0000
parent 11787:3ae6fa901a8b
child 12975:d10957394a3c
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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 local t_move = require "util.table".move;
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12
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13 local setmetatable = setmetatable;
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14 local getmetatable = getmetatable;
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15 local math_random = math.random;
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16 local math_floor = math.floor;
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17 local pairs, ipairs = pairs, ipairs;
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18 local tostring = tostring;
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19 local type = type;
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20
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21 local array = {};
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22 local array_base = {};
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23 local array_methods = {};
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24 local array_mt = {
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25 __index = array_methods;
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26 __name = "array";
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27 __tostring = function (self) return "{"..self:concat(", ").."}"; end;
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28 };
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29
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30 function array_mt:__freeze() return self; end
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31
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32 local function new_array(self, t, _s, _var)
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33 if type(t) == "function" then -- Assume iterator
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34 t = self.collect(t, _s, _var);
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35 end
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36 return setmetatable(t or {}, array_mt);
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37 end
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38
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39 function array_mt.__add(a1, a2)
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40 local res = new_array();
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41 return res:append(a1):append(a2);
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42 end
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43
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44 function array_mt.__eq(a, b)
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45 if getmetatable(a) ~= array_mt or getmetatable(b) ~= array_mt then
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46 -- Lua 5.3+ calls this if both operands are tables, even if metatables differ
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47 return false;
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48 end
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49 if #a == #b then
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50 for i = 1, #a do
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51 if a[i] ~= b[i] then
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52 return false;
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53 end
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54 end
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55 else
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56 return false;
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57 end
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58 return true;
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59 end
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60
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61 function array_mt.__div(a1, func)
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62 local a2 = new_array();
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63 local o = 0;
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64 for i = 1, #a1 do
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65 local new_value = func(a1[i]);
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66 if new_value ~= nil then
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67 o = o + 1;
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68 a2[o] = new_value;
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69 end
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70 end
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71 return a2;
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72 end
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73
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74 setmetatable(array, { __call = new_array });
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75
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76 -- Read-only methods
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77 function array_methods:random()
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78 return self[math_random(1, #self)];
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79 end
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80
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81 -- Return a random value excluding the one at idx
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82 function array_methods:random_other(idx)
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83 local max = #self;
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84 return self[((math.random(1, max-1)+(idx-1))%max)+1];
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85 end
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86
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87 -- These methods can be called two ways:
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88 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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89 -- existing_array:method([params, ...]) -- Transform existing array into result
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90 --
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91 function array_base.map(outa, ina, func)
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92 for k, v in ipairs(ina) do
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93 outa[k] = func(v);
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94 end
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95 return outa;
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96 end
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97
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98 function array_base.filter(outa, ina, func)
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99 local inplace, start_length = ina == outa, #ina;
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100 local write = 1;
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101 for read = 1, start_length do
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102 local v = ina[read];
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103 if func(v) then
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104 outa[write] = v;
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105 write = write + 1;
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106 end
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107 end
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108
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109 if inplace and write <= start_length then
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110 for i = write, start_length do
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111 outa[i] = nil;
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112 end
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113 end
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114
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115 return outa;
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116 end
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117
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118 function array_base.slice(outa, ina, i, j)
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119 if j == nil then
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120 j = -1;
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121 end
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122 if j < 0 then
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123 j = #ina + (j+1);
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124 end
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125 if i < 0 then
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126 i = #ina + (i+1);
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127 end
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128 if i < 1 then
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129 i = 1;
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130 end
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131 if j > #ina then
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132 j = #ina;
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133 end
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134 if i > j then
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135 for idx = 1, #outa do
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136 outa[idx] = nil;
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parents: 10895
diff changeset
137 end
3ae6fa901a8b util.array: Add :slice() method + tests
Matthew Wild <mwild1@gmail.com>
parents: 10895
diff changeset
138 return outa;
3ae6fa901a8b util.array: Add :slice() method + tests
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parents: 10895
diff changeset
139 end
3ae6fa901a8b util.array: Add :slice() method + tests
Matthew Wild <mwild1@gmail.com>
parents: 10895
diff changeset
140
12403
42b2713ab818 util.array: Take advantage of table.move()
Matthew Wild <mwild1@gmail.com>
parents: 11787
diff changeset
141
42b2713ab818 util.array: Take advantage of table.move()
Matthew Wild <mwild1@gmail.com>
parents: 11787
diff changeset
142 t_move(ina, i, j, 1, outa);
11787
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parents: 10895
diff changeset
143 if ina == outa then
12403
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parents: 11787
diff changeset
144 -- Clear (nil) remainder of range
42b2713ab818 util.array: Take advantage of table.move()
Matthew Wild <mwild1@gmail.com>
parents: 11787
diff changeset
145 t_move(ina, #outa+1, #outa*2, 2+j-i, ina);
11787
3ae6fa901a8b util.array: Add :slice() method + tests
Matthew Wild <mwild1@gmail.com>
parents: 10895
diff changeset
146 end
3ae6fa901a8b util.array: Add :slice() method + tests
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parents: 10895
diff changeset
147 return outa;
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diff changeset
148 end
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parents: 10895
diff changeset
149
1905
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150 function array_base.sort(outa, ina, ...)
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parents: 1522
diff changeset
151 if ina ~= outa then
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parents: 1522
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152 outa:append(ina);
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parents: 1522
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153 end
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parents: 1522
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154 t_sort(outa, ...);
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
155 return outa;
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
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156 end
918
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157
8017
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
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diff changeset
158 function array_base.unique(outa, ina)
ec7cab8e744d util.array: Add method for filtering out duplicate values
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159 local seen = {};
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diff changeset
160 return array_base.filter(outa, ina, function (item)
ec7cab8e744d util.array: Add method for filtering out duplicate values
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diff changeset
161 if seen[item] then
ec7cab8e744d util.array: Add method for filtering out duplicate values
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diff changeset
162 return false;
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
parents: 7976
diff changeset
163 else
ec7cab8e744d util.array: Add method for filtering out duplicate values
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parents: 7976
diff changeset
164 seen[item] = true;
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165 return true;
ec7cab8e744d util.array: Add method for filtering out duplicate values
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parents: 7976
diff changeset
166 end
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
parents: 7976
diff changeset
167 end);
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
parents: 7976
diff changeset
168 end
ec7cab8e744d util.array: Add method for filtering out duplicate values
Kim Alvefur <zash@zash.se>
parents: 7976
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169
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5777968301e8 util.array: pluck: Support default value to avoid holes
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diff changeset
170 function array_base.pluck(outa, ina, key, default)
7019
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171 for i = 1, #ina do
10895
5777968301e8 util.array: pluck: Support default value to avoid holes
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parents: 10592
diff changeset
172 local v = ina[i][key];
5777968301e8 util.array: pluck: Support default value to avoid holes
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parents: 10592
diff changeset
173 if v == nil then
5777968301e8 util.array: pluck: Support default value to avoid holes
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parents: 10592
diff changeset
174 v = default;
5777968301e8 util.array: pluck: Support default value to avoid holes
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parents: 10592
diff changeset
175 end
5777968301e8 util.array: pluck: Support default value to avoid holes
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parents: 10592
diff changeset
176 outa[i] = v;
4439
1c8d2c0d02db util.array: Add pluck() method to pick a given property from each item
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parents: 4387
diff changeset
177 end
1c8d2c0d02db util.array: Add pluck() method to pick a given property from each item
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diff changeset
178 return outa;
1c8d2c0d02db util.array: Add pluck() method to pick a given property from each item
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parents: 4387
diff changeset
179 end
1c8d2c0d02db util.array: Add pluck() method to pick a given property from each item
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diff changeset
180
5857
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
181 function array_base.reverse(outa, ina)
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parents: 5776
diff changeset
182 local len = #ina;
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parents: 5776
diff changeset
183 if ina == outa then
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parents: 5776
diff changeset
184 local middle = math_floor(len/2);
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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parents: 5776
diff changeset
185 len = len + 1;
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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parents: 5776
diff changeset
186 local o; -- opposite
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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parents: 5776
diff changeset
187 for i = 1, middle do
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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parents: 5776
diff changeset
188 o = len - i;
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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parents: 5776
diff changeset
189 outa[i], outa[o] = outa[o], outa[i];
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
190 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
191 else
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
192 local off = len + 1;
8613888d0f9e util.array: Improve array:reverse() and make it work as both method and non-mutating function
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parents: 5776
diff changeset
193 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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parents: 5776
diff changeset
194 outa[i] = ina[off - i];
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
195 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
196 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
197 return outa;
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
198 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
199
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
200 --- These methods only mutate the array
7700
0d70410efdcf util.array: Remove unused arguments [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7699
diff changeset
201 function array_methods:shuffle()
918
967edf874df7 util.array: New array library
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parents:
diff changeset
202 local len = #self;
7019
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
203 for i = 1, #self do
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
204 local r = math_random(i, len);
918
967edf874df7 util.array: New array library
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parents:
diff changeset
205 self[i], self[r] = self[r], self[i];
967edf874df7 util.array: New array library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
206 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
207 return self;
918
967edf874df7 util.array: New array library
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parents:
diff changeset
208 end
967edf874df7 util.array: New array library
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
209
7699
9c40d0be2295 util.array: Rename arguments to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7020
diff changeset
210 function array_methods:append(ina)
12403
42b2713ab818 util.array: Take advantage of table.move()
Matthew Wild <mwild1@gmail.com>
parents: 11787
diff changeset
211 t_move(ina, 1, #ina, #self+1, self);
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
212 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
213 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
214
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
215 function array_methods:push(x)
4449
ca74d8ed1a15 util.array: Avoid globals.
Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
216 t_insert(self, x);
4448
d745f4c28294 util.array: Make array:push() chainable.
Waqas Hussain <waqas20@gmail.com>
parents: 4440
diff changeset
217 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
218 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
219
7020
6ab9c691c4c6 util.array: Just use table.remove as array:pop()
Kim Alvefur <zash@zash.se>
parents: 7019
diff changeset
220 array_methods.pop = t_remove;
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
221
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
222 function array_methods:concat(sep)
4449
ca74d8ed1a15 util.array: Avoid globals.
Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
223 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
224 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
225
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
226 function array_methods:length()
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
227 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
228 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
229
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
230 --- 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
231 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
232 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
233 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
234 var = f(s, var);
7019
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
235 if var == nil then break; end
4449
ca74d8ed1a15 util.array: Avoid globals.
Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
236 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
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parents: 922
diff changeset
237 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
238 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
239 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
240
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
241 ---
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
242
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
243 -- 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
244 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
245 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
246 -- 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
247 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
248 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
249 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
250 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
251 -- 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
252 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
253 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
254 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
255 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
256
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
257 return array;