prosody
98c8d14be4ef
util/array.lua

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util/array.lua @ 7496:98c8d14be4ef

Merge 0.9->0.10
author Kim Alvefur <zash@zash.se>
date Wed, 13 Jul 2016 18:43:28 +0200
parent 7020:6ab9c691c4c6
child 7699:9c40d0be2295
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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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18
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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 = { __index = array_methods, __tostring = function (array) return "{"..array:concat(", ").."}"; end };
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24 local function new_array(self, t, _s, _var)
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25 if type(t) == "function" then -- Assume iterator
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26 t = self.collect(t, _s, _var);
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27 end
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28 return setmetatable(t or {}, array_mt);
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29 end
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30
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31 function array_mt.__add(a1, a2)
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32 local res = new_array();
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33 return res:append(a1):append(a2);
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34 end
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35
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36 setmetatable(array, { __call = new_array });
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37
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38 -- Read-only methods
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39 function array_methods:random()
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40 return self[math_random(1, #self)];
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41 end
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42
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43 -- These methods can be called two ways:
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44 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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45 -- existing_array:method([params, ...]) -- Transform existing array into result
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46 --
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47 function array_base.map(outa, ina, func)
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48 for k, v in ipairs(ina) do
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49 outa[k] = func(v);
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50 end
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51 return outa;
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52 end
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53
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54 function array_base.filter(outa, ina, func)
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55 local inplace, start_length = ina == outa, #ina;
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56 local write = 1;
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57 for read = 1, start_length do
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58 local v = ina[read];
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59 if func(v) then
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60 outa[write] = v;
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61 write = write + 1;
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62 end
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63 end
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64
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65 if inplace and write <= start_length then
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66 for i = write, start_length do
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67 outa[i] = nil;
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68 end
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69 end
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70
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71 return outa;
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72 end
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73
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74 function array_base.sort(outa, ina, ...)
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75 if ina ~= outa then
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76 outa:append(ina);
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77 end
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78 t_sort(outa, ...);
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79 return outa;
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80 end
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81
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82 function array_base.pluck(outa, ina, key)
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83 for i = 1, #ina do
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84 outa[i] = ina[i][key];
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85 end
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86 return outa;
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87 end
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88
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89 function array_base.reverse(outa, ina)
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90 local len = #ina;
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91 if ina == outa then
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92 local middle = math_floor(len/2);
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93 len = len + 1;
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94 local o; -- opposite
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95 for i = 1, middle do
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96 o = len - i;
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97 outa[i], outa[o] = outa[o], outa[i];
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98 end
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99 else
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100 local off = len + 1;
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101 for i = 1, len do
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102 outa[i] = ina[off - i];
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103 end
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104 end
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105 return outa;
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106 end
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107
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108 --- These methods only mutate the array
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109 function array_methods:shuffle(outa, ina)
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110 local len = #self;
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111 for i = 1, #self do
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112 local r = math_random(i, len);
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113 self[i], self[r] = self[r], self[i];
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114 end
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115 return self;
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116 end
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117
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118 function array_methods:append(array)
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119 local len, len2 = #self, #array;
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120 for i = 1, len2 do
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121 self[len+i] = array[i];
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122 end
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123 return self;
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124 end
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125
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126 function array_methods:push(x)
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127 t_insert(self, x);
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128 return self;
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129 end
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130
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131 array_methods.pop = t_remove;
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132
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133 function array_methods:concat(sep)
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134 return t_concat(array.map(self, tostring), sep);
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135 end
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136
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137 function array_methods:length()
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138 return #self;
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139 end
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140
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141 --- These methods always create a new array
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142 function array.collect(f, s, var)
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143 local t = {};
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144 while true do
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145 var = f(s, var);
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146 if var == nil then break; end
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147 t_insert(t, var);
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148 end
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149 return setmetatable(t, array_mt);
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150 end
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151
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152 ---
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153
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154 -- Setup methods from array_base
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155 for method, f in pairs(array_base) do
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156 local base_method = f;
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157 -- Setup global array method which makes new array
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158 array[method] = function (old_a, ...)
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159 local a = new_array();
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160 return base_method(a, old_a, ...);
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161 end
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162 -- Setup per-array (mutating) method
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163 array_methods[method] = function (self, ...)
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164 return base_method(self, self, ...);
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165 end
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166 end
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167
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168 return array;