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util/array.lua

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util/array.lua @ 5085:cbc7eb5cfa8c

util.array: Accept an iterator to the array constructor
author Matthew Wild <mwild1@gmail.com>
date Wed, 08 Aug 2012 11:49:31 +0100
parent 4449:ca74d8ed1a15
child 5564:1292643ac498
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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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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(self, t, _s, _var)
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23 if type(t) == "function" then -- Assume iterator
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24 t = self.collect(t, _s, _var);
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25 end
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26 return setmetatable(t or {}, array_mt);
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27 end
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29 function array_mt.__add(a1, a2)
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30 local res = new_array();
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31 return res:append(a1):append(a2);
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32 end
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33
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34 setmetatable(array, { __call = new_array });
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35
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36 -- Read-only methods
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37 function array_methods:random()
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38 return self[math_random(1,#self)];
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39 end
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41 -- These methods can be called two ways:
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42 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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43 -- existing_array:method([params, ...]) -- Transform existing array into result
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44 --
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45 function array_base.map(outa, ina, func)
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46 for k,v in ipairs(ina) do
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47 outa[k] = func(v);
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48 end
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49 return outa;
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50 end
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51
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52 function array_base.filter(outa, ina, func)
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53 local inplace, start_length = ina == outa, #ina;
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54 local write = 1;
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55 for read=1,start_length do
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56 local v = ina[read];
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57 if func(v) then
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58 outa[write] = v;
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59 write = write + 1;
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60 end
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61 end
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62
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63 if inplace and write <= start_length then
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64 for i=write,start_length do
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65 outa[i] = nil;
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66 end
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67 end
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68
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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.sort(outa, ina, ...)
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73 if ina ~= outa then
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74 outa:append(ina);
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75 end
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76 t_sort(outa, ...);
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77 return outa;
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78 end
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79
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80 function array_base.pluck(outa, ina, key)
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81 for i=1,#ina do
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82 outa[i] = ina[i][key];
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83 end
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84 return outa;
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85 end
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86
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87 --- These methods only mutate the array
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88 function array_methods:shuffle(outa, ina)
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89 local len = #self;
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90 for i=1,#self do
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91 local r = math_random(i,len);
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92 self[i], self[r] = self[r], self[i];
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93 end
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94 return self;
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95 end
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96
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97 function array_methods:reverse()
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98 local len = #self-1;
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99 for i=len,1,-1 do
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100 self:push(self[i]);
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101 self:pop(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:append(array)
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107 local len,len2 = #self, #array;
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108 for i=1,len2 do
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109 self[len+i] = array[i];
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110 end
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111 return self;
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112 end
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113
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114 function array_methods:push(x)
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115 t_insert(self, x);
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116 return self;
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117 end
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118
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119 function array_methods:pop(x)
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120 local v = self[x];
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121 t_remove(self, x);
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122 return v;
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123 end
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124
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125 function array_methods:concat(sep)
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126 return t_concat(array.map(self, tostring), sep);
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127 end
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128
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129 function array_methods:length()
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130 return #self;
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131 end
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132
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133 --- These methods always create a new array
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134 function array.collect(f, s, var)
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135 local t = {};
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136 while true do
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137 var = f(s, var);
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138 if var == nil then break; end
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139 t_insert(t, var);
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140 end
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141 return setmetatable(t, array_mt);
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142 end
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143
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144 ---
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145
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146 -- Setup methods from array_base
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147 for method, f in pairs(array_base) do
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148 local base_method = f;
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149 -- Setup global array method which makes new array
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150 array[method] = function (old_a, ...)
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151 local a = new_array();
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152 return base_method(a, old_a, ...);
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153 end
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154 -- Setup per-array (mutating) method
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155 array_methods[method] = function (self, ...)
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156 return base_method(self, self, ...);
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157 end
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158 end
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159
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160 _G.array = array;
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161 module("array");
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162
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163 return array;