prosody
c60ed6732b34
util/array.lua

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util/array.lua @ 4440:c60ed6732b34

util.array: Expand some of the more basic methods to act more sensibly than their names suggested
author Matthew Wild <mwild1@gmail.com>
date Wed, 07 Dec 2011 05:14:58 +0000
parent 4439:1c8d2c0d02db
child 4448:d745f4c28294
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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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12 local array = {};
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13 local array_base = {};
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14 local array_methods = {};
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15 local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end };
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16
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17 local function new_array(_, t)
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18 return setmetatable(t or {}, array_mt);
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19 end
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21 function array_mt.__add(a1, a2)
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22 local res = new_array();
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23 return res:append(a1):append(a2);
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24 end
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25
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26 setmetatable(array, { __call = new_array });
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27
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28 -- Read-only methods
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29 function array_methods:random()
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30 return self[math.random(1,#self)];
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31 end
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32
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33 -- These methods can be called two ways:
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34 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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35 -- existing_array:method([params, ...]) -- Transform existing array into result
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36 --
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37 function array_base.map(outa, ina, func)
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38 for k,v in ipairs(ina) do
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39 outa[k] = func(v);
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40 end
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41 return outa;
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42 end
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43
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44 function array_base.filter(outa, ina, func)
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45 local inplace, start_length = ina == outa, #ina;
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46 local write = 1;
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47 for read=1,start_length do
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48 local v = ina[read];
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49 if func(v) then
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50 outa[write] = v;
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51 write = write + 1;
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52 end
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53 end
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54
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55 if inplace and write <= start_length then
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56 for i=write,start_length do
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57 outa[i] = nil;
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58 end
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59 end
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60
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61 return outa;
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62 end
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63
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64 function array_base.sort(outa, ina, ...)
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65 if ina ~= outa then
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66 outa:append(ina);
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67 end
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68 t_sort(outa, ...);
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69 return outa;
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70 end
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71
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72 function array_base.pluck(outa, ina, key)
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73 for i=1,#ina do
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74 outa[i] = ina[i][key];
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75 end
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76 return outa;
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77 end
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78
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79 --- These methods only mutate the array
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80 function array_methods:shuffle(outa, ina)
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81 local len = #self;
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82 for i=1,#self do
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83 local r = math.random(i,len);
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84 self[i], self[r] = self[r], self[i];
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85 end
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86 return self;
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87 end
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88
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89 function array_methods:reverse()
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90 local len = #self-1;
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91 for i=len,1,-1 do
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92 self:push(self[i]);
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93 self:pop(i);
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94 end
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95 return self;
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96 end
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97
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98 function array_methods:append(array)
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99 local len,len2 = #self, #array;
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100 for i=1,len2 do
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101 self[len+i] = array[i];
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102 end
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103 return self;
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104 end
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105
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106 function array_methods:push(x)
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107 table.insert(self, x);
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108 end
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109
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110 function array_methods:pop(x)
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111 local v = self[x];
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112 table.remove(self, x);
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113 return v;
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114 end
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115
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116 function array_methods:concat(sep)
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117 return table.concat(array.map(self, tostring), sep);
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118 end
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119
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120 function array_methods:length()
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121 return #self;
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122 end
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124 --- These methods always create a new array
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125 function array.collect(f, s, var)
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126 local t = {};
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127 while true do
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128 var = f(s, var);
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129 if var == nil then break; end
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130 table.insert(t, var);
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131 end
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132 return setmetatable(t, array_mt);
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133 end
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134
1905
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135 ---
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136
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137 -- Setup methods from array_base
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138 for method, f in pairs(array_base) do
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139 local base_method = f;
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140 -- Setup global array method which makes new array
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141 array[method] = function (old_a, ...)
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142 local a = new_array();
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143 return base_method(a, old_a, ...);
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144 end
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145 -- Setup per-array (mutating) method
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146 array_methods[method] = function (self, ...)
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147 return base_method(self, self, ...);
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148 end
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149 end
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150
1027
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151 _G.array = array;
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152 module("array");
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153
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154 return array;