prosody
fb522fbd495e
util/array.lua

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util/array.lua @ 4666:fb522fbd495e

moduleapi: Add module:add_timer(delay, callback) - automatically halts the timer on module unload
author Matthew Wild <mwild1@gmail.com>
date Mon, 23 Apr 2012 15:38:40 +0100
parent 4449:ca74d8ed1a15
child 5085:cbc7eb5cfa8c
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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 setmetatable = setmetatable;
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13 local math_random = math.random;
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14 local pairs, ipairs = pairs, ipairs;
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15 local tostring = tostring;
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16
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17 local array = {};
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18 local array_base = {};
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19 local array_methods = {};
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20 local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end };
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21
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22 local function new_array(_, t)
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23 return setmetatable(t or {}, array_mt);
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24 end
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25
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26 function array_mt.__add(a1, a2)
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27 local res = new_array();
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28 return res:append(a1):append(a2);
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29 end
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30
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31 setmetatable(array, { __call = new_array });
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32
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33 -- Read-only methods
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34 function array_methods:random()
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35 return self[math_random(1,#self)];
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36 end
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37
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38 -- These methods can be called two ways:
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39 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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40 -- existing_array:method([params, ...]) -- Transform existing array into result
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41 --
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42 function array_base.map(outa, ina, func)
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43 for k,v in ipairs(ina) do
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44 outa[k] = func(v);
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45 end
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46 return outa;
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47 end
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48
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49 function array_base.filter(outa, ina, func)
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50 local inplace, start_length = ina == outa, #ina;
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51 local write = 1;
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52 for read=1,start_length do
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53 local v = ina[read];
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54 if func(v) then
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55 outa[write] = v;
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56 write = write + 1;
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57 end
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58 end
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59
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60 if inplace and write <= start_length then
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61 for i=write,start_length do
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62 outa[i] = nil;
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63 end
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64 end
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65
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66 return outa;
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67 end
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68
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69 function array_base.sort(outa, ina, ...)
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70 if ina ~= outa then
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71 outa:append(ina);
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72 end
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73 t_sort(outa, ...);
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74 return outa;
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75 end
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76
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77 function array_base.pluck(outa, ina, key)
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78 for i=1,#ina do
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79 outa[i] = ina[i][key];
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80 end
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81 return outa;
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82 end
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83
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84 --- These methods only mutate the array
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85 function array_methods:shuffle(outa, ina)
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86 local len = #self;
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87 for i=1,#self do
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88 local r = math_random(i,len);
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89 self[i], self[r] = self[r], self[i];
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90 end
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91 return self;
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92 end
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93
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94 function array_methods:reverse()
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95 local len = #self-1;
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96 for i=len,1,-1 do
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97 self:push(self[i]);
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98 self:pop(i);
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99 end
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100 return self;
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101 end
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102
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103 function array_methods:append(array)
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104 local len,len2 = #self, #array;
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105 for i=1,len2 do
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106 self[len+i] = array[i];
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107 end
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108 return self;
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109 end
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110
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111 function array_methods:push(x)
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112 t_insert(self, x);
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113 return self;
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114 end
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115
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116 function array_methods:pop(x)
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117 local v = self[x];
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118 t_remove(self, x);
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119 return v;
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120 end
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121
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122 function array_methods:concat(sep)
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123 return t_concat(array.map(self, tostring), sep);
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124 end
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125
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126 function array_methods:length()
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127 return #self;
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128 end
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129
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130 --- These methods always create a new array
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131 function array.collect(f, s, var)
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132 local t = {};
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133 while true do
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134 var = f(s, var);
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135 if var == nil then break; end
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136 t_insert(t, var);
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137 end
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138 return setmetatable(t, array_mt);
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139 end
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140
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141 ---
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142
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143 -- Setup methods from array_base
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144 for method, f in pairs(array_base) do
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145 local base_method = f;
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146 -- Setup global array method which makes new array
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147 array[method] = function (old_a, ...)
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148 local a = new_array();
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149 return base_method(a, old_a, ...);
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150 end
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151 -- Setup per-array (mutating) method
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152 array_methods[method] = function (self, ...)
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153 return base_method(self, self, ...);
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154 end
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155 end
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156
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157 _G.array = array;
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158 module("array");
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159
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160 return array;