prosody
8613888d0f9e
util/array.lua

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util/array.lua @ 5857:8613888d0f9e

util.array: Improve array:reverse() and make it work as both method and non-mutating function
author Kim Alvefur <zash@zash.se>
date Sun, 06 Oct 2013 23:18:54 +0200
parent 5776:bd0ff8ae98a8
child 6417:060b63a27e9b
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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
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18 local array = {};
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19 local array_base = {};
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20 local array_methods = {};
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21 local array_mt = { __index = array_methods, __tostring = function (array) return "{"..array:concat(", ").."}"; end };
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23 local function new_array(self, t, _s, _var)
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24 if type(t) == "function" then -- Assume iterator
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25 t = self.collect(t, _s, _var);
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26 end
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27 return setmetatable(t or {}, array_mt);
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28 end
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29
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30 function array_mt.__add(a1, a2)
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31 local res = new_array();
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32 return res:append(a1):append(a2);
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33 end
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34
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35 setmetatable(array, { __call = new_array });
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36
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37 -- Read-only methods
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38 function array_methods:random()
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39 return self[math_random(1,#self)];
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40 end
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41
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42 -- These methods can be called two ways:
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43 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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44 -- existing_array:method([params, ...]) -- Transform existing array into result
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45 --
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46 function array_base.map(outa, ina, func)
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47 for k,v in ipairs(ina) do
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48 outa[k] = func(v);
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49 end
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50 return outa;
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51 end
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52
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53 function array_base.filter(outa, ina, func)
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54 local inplace, start_length = ina == outa, #ina;
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55 local write = 1;
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56 for read=1,start_length do
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57 local v = ina[read];
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58 if func(v) then
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59 outa[write] = v;
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60 write = write + 1;
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61 end
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62 end
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63
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64 if inplace and write <= start_length then
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65 for i=write,start_length do
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66 outa[i] = nil;
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67 end
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68 end
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69
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70 return outa;
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71 end
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72
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73 function array_base.sort(outa, ina, ...)
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74 if ina ~= outa then
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75 outa:append(ina);
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76 end
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77 t_sort(outa, ...);
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78 return outa;
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79 end
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80
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81 function array_base.pluck(outa, ina, key)
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82 for i=1,#ina do
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83 outa[i] = ina[i][key];
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84 end
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85 return outa;
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86 end
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87
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88 function array_base.reverse(outa, ina)
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89 local len = #ina;
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90 if ina == outa then
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91 local middle = math_floor(len/2);
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92 len = len + 1;
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93 local o; -- opposite
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94 for i = 1, middle do
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95 o = len - i;
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96 outa[i], outa[o] = outa[o], outa[i];
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97 end
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98 else
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99 local off = len + 1;
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100 for i = 1, len do
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101 outa[i] = ina[off - i];
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102 end
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103 end
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104 return outa;
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105 end
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106
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107 --- These methods only mutate the array
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108 function array_methods:shuffle(outa, ina)
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109 local len = #self;
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110 for i=1,#self do
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111 local r = math_random(i,len);
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112 self[i], self[r] = self[r], self[i];
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113 end
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114 return self;
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115 end
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116
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117 function array_methods:append(array)
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118 local len,len2 = #self, #array;
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119 for i=1,len2 do
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120 self[len+i] = array[i];
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121 end
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122 return self;
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123 end
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124
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125 function array_methods:push(x)
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126 t_insert(self, x);
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127 return self;
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128 end
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129
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130 function array_methods:pop(x)
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131 local v = self[x];
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132 t_remove(self, x);
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133 return v;
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134 end
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135
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136 function array_methods:concat(sep)
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137 return t_concat(array.map(self, tostring), sep);
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138 end
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139
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140 function array_methods:length()
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141 return #self;
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142 end
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143
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144 --- These methods always create a new array
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145 function array.collect(f, s, var)
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146 local t = {};
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147 while true do
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148 var = f(s, var);
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149 if var == nil then break; end
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150 t_insert(t, var);
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151 end
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152 return setmetatable(t, array_mt);
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153 end
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154
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155 ---
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156
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157 -- Setup methods from array_base
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158 for method, f in pairs(array_base) do
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159 local base_method = f;
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160 -- Setup global array method which makes new array
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161 array[method] = function (old_a, ...)
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162 local a = new_array();
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163 return base_method(a, old_a, ...);
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164 end
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165 -- Setup per-array (mutating) method
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166 array_methods[method] = function (self, ...)
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167 return base_method(self, self, ...);
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168 end
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169 end
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170
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171 _G.array = array;
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172 module("array");
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173
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174 return array;