prosody
6a1e7723208b
util/array.lua

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util/array.lua @ 9529:6a1e7723208b

util.array: Add __div for parity with util.set
author Matthew Wild <mwild1@gmail.com>
date Sun, 21 Oct 2018 15:38:55 +0100
parent 9528:1af7cc3b9747
child 10592:9918b4b0cd58
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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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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 math_random = math.random;
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14 local math_floor = math.floor;
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15 local pairs, ipairs = pairs, ipairs;
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16 local tostring = tostring;
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17 local type = type;
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19 local array = {};
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20 local array_base = {};
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21 local array_methods = {};
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22 local array_mt = {
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23 __index = array_methods;
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24 __name = "array";
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25 __tostring = function (self) return "{"..self:concat(", ").."}"; end;
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26 };
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27
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28 function array_mt:__freeze() return self; end
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29
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30 local function new_array(self, t, _s, _var)
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31 if type(t) == "function" then -- Assume iterator
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32 t = self.collect(t, _s, _var);
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33 end
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34 return setmetatable(t or {}, array_mt);
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35 end
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36
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37 function array_mt.__add(a1, a2)
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38 local res = new_array();
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39 return res:append(a1):append(a2);
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40 end
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41
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42 function array_mt.__eq(a, b)
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43 if #a == #b then
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44 for i = 1, #a do
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45 if a[i] ~= b[i] then
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46 return false;
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47 end
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48 end
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49 else
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50 return false;
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51 end
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52 return true;
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53 end
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54
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55 function array_mt.__div(a1, func)
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56 local a2 = new_array();
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57 local o = 0;
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58 for i = 1, #a1 do
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59 local new_value = func(a1[i]);
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60 if new_value ~= nil then
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61 o = o + 1;
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62 a2[o] = new_value;
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63 end
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64 end
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65 return a2;
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66 end
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67
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68 setmetatable(array, { __call = new_array });
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69
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70 -- Read-only methods
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71 function array_methods:random()
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72 return self[math_random(1, #self)];
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73 end
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74
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75 -- Return a random value excluding the one at idx
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76 function array_methods:random_other(idx)
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77 local max = #self;
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78 return self[((math.random(1, max-1)+(idx-1))%max)+1];
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79 end
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80
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81 -- These methods can be called two ways:
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82 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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83 -- existing_array:method([params, ...]) -- Transform existing array into result
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84 --
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85 function array_base.map(outa, ina, func)
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86 for k, v in ipairs(ina) do
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87 outa[k] = func(v);
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88 end
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89 return outa;
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90 end
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91
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92 function array_base.filter(outa, ina, func)
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93 local inplace, start_length = ina == outa, #ina;
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94 local write = 1;
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95 for read = 1, start_length do
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96 local v = ina[read];
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97 if func(v) then
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98 outa[write] = v;
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99 write = write + 1;
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100 end
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101 end
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102
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103 if inplace and write <= start_length then
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104 for i = write, start_length do
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105 outa[i] = nil;
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106 end
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107 end
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108
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109 return outa;
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110 end
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111
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112 function array_base.sort(outa, ina, ...)
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113 if ina ~= outa then
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114 outa:append(ina);
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115 end
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116 t_sort(outa, ...);
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117 return outa;
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118 end
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119
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120 function array_base.unique(outa, ina)
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121 local seen = {};
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122 return array_base.filter(outa, ina, function (item)
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123 if seen[item] then
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124 return false;
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125 else
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126 seen[item] = true;
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127 return true;
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128 end
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129 end);
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130 end
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131
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132 function array_base.pluck(outa, ina, key)
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133 for i = 1, #ina do
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134 outa[i] = ina[i][key];
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135 end
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136 return outa;
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137 end
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138
5857
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139 function array_base.reverse(outa, ina)
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140 local len = #ina;
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141 if ina == outa then
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142 local middle = math_floor(len/2);
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143 len = len + 1;
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144 local o; -- opposite
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145 for i = 1, middle do
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146 o = len - i;
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147 outa[i], outa[o] = outa[o], outa[i];
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148 end
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149 else
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150 local off = len + 1;
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151 for i = 1, len do
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152 outa[i] = ina[off - i];
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153 end
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154 end
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155 return outa;
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156 end
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157
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158 --- These methods only mutate the array
7700
0d70410efdcf util.array: Remove unused arguments [luacheck]
Kim Alvefur <zash@zash.se>
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159 function array_methods:shuffle()
918
967edf874df7 util.array: New array library
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parents:
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160 local len = #self;
7019
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
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161 for i = 1, #self do
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Kim Alvefur <zash@zash.se>
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162 local r = math_random(i, len);
918
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163 self[i], self[r] = self[r], self[i];
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parents:
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164 end
1372
3b13bb57002e util.array: Make array:reverse() and array:shuffle() return the array to allow chaining
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165 return self;
918
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parents:
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166 end
967edf874df7 util.array: New array library
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parents:
diff changeset
167
7699
9c40d0be2295 util.array: Rename arguments to avoid name clash [luacheck]
Kim Alvefur <zash@zash.se>
parents: 7020
diff changeset
168 function array_methods:append(ina)
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diff changeset
169 local len, len2 = #self, #ina;
7019
abcd5ec3ee41 util.array: Fix minory style issues
Kim Alvefur <zash@zash.se>
parents: 6777
diff changeset
170 for i = 1, len2 do
7699
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parents: 7020
diff changeset
171 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
172 end
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diff changeset
173 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
174 end
9e45bdf55353 util.array: Add array:append() method, to append a new array to an existing one
Matthew Wild <mwild1@gmail.com>
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diff changeset
175
4440
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parents: 4439
diff changeset
176 function array_methods:push(x)
4449
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Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
177 t_insert(self, x);
4448
d745f4c28294 util.array: Make array:push() chainable.
Waqas Hussain <waqas20@gmail.com>
parents: 4440
diff changeset
178 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
179 end
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
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diff changeset
180
7020
6ab9c691c4c6 util.array: Just use table.remove as array:pop()
Kim Alvefur <zash@zash.se>
parents: 7019
diff changeset
181 array_methods.pop = t_remove;
4440
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diff changeset
182
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
183 function array_methods:concat(sep)
4449
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Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
184 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
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parents: 4439
diff changeset
185 end
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
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diff changeset
186
c60ed6732b34 util.array: Expand some of the more basic methods to act more sensibly than their names suggested
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diff changeset
187 function array_methods:length()
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diff changeset
188 return #self;
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
189 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
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190
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parents: 1522
diff changeset
191 --- 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
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parents: 922
diff changeset
192 function array.collect(f, s, var)
4387
06161b0b83f2 util.array: Fix array.collect() for iterators that expect initial value of var to be preserved
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parents: 3540
diff changeset
193 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
194 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
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parents: 922
diff changeset
195 var = f(s, var);
7019
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parents: 6777
diff changeset
196 if var == nil then break; end
4449
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Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
197 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
198 end
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
199 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
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parents: 922
diff changeset
200 end
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
201
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
202 ---
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
203
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
204 -- 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
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parents: 1522
diff changeset
205 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
206 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
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parents: 1522
diff changeset
207 -- 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
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parents: 1522
diff changeset
208 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
209 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
210 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
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parents: 1522
diff changeset
211 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
212 -- 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
213 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
214 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
215 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
216 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
217
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
218 return array;