prosody
4e38121a349d
util/array.lua

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util/array.lua @ 9487:4e38121a349d

util.array: Add freeze metamethod
author Kim Alvefur <zash@zash.se>
date Fri, 12 Oct 2018 00:51:52 +0200
parent 8521:6f5ce0f09f40
child 9528:1af7cc3b9747
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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, __name = "array", __tostring = function (self) return "{"..self:concat(", ").."}"; end };
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24 function array_mt:__freeze() return self; end
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25
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26 local function new_array(self, t, _s, _var)
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27 if type(t) == "function" then -- Assume iterator
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28 t = self.collect(t, _s, _var);
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29 end
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30 return setmetatable(t or {}, array_mt);
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31 end
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32
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33 function array_mt.__add(a1, a2)
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34 local res = new_array();
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35 return res:append(a1):append(a2);
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36 end
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37
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38 function array_mt.__eq(a, b)
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39 if #a == #b then
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40 for i = 1, #a do
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41 if a[i] ~= b[i] then
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42 return false;
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43 end
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44 end
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45 else
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46 return false;
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47 end
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48 return true;
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49 end
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50
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51 setmetatable(array, { __call = new_array });
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52
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53 -- Read-only methods
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54 function array_methods:random()
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55 return self[math_random(1, #self)];
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56 end
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57
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58 -- These methods can be called two ways:
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59 -- array.method(existing_array, [params [, ...]]) -- Create new array for result
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60 -- existing_array:method([params, ...]) -- Transform existing array into result
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61 --
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62 function array_base.map(outa, ina, func)
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63 for k, v in ipairs(ina) do
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64 outa[k] = func(v);
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65 end
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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.filter(outa, ina, func)
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70 local inplace, start_length = ina == outa, #ina;
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71 local write = 1;
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72 for read = 1, start_length do
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73 local v = ina[read];
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74 if func(v) then
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75 outa[write] = v;
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76 write = write + 1;
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77 end
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78 end
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79
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80 if inplace and write <= start_length then
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81 for i = write, start_length do
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82 outa[i] = nil;
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83 end
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84 end
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85
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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.sort(outa, ina, ...)
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90 if ina ~= outa then
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91 outa:append(ina);
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92 end
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93 t_sort(outa, ...);
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94 return outa;
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95 end
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96
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97 function array_base.unique(outa, ina)
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98 local seen = {};
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99 return array_base.filter(outa, ina, function (item)
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100 if seen[item] then
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101 return false;
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102 else
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103 seen[item] = true;
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104 return true;
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105 end
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106 end);
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107 end
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108
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109 function array_base.pluck(outa, ina, key)
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110 for i = 1, #ina do
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111 outa[i] = ina[i][key];
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112 end
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113 return outa;
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114 end
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115
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116 function array_base.reverse(outa, ina)
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117 local len = #ina;
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118 if ina == outa then
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119 local middle = math_floor(len/2);
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120 len = len + 1;
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121 local o; -- opposite
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122 for i = 1, middle do
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123 o = len - i;
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124 outa[i], outa[o] = outa[o], outa[i];
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125 end
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126 else
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127 local off = len + 1;
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128 for i = 1, len do
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129 outa[i] = ina[off - i];
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130 end
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131 end
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132 return outa;
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133 end
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134
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135 --- These methods only mutate the array
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136 function array_methods:shuffle()
918
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137 local len = #self;
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Kim Alvefur <zash@zash.se>
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138 for i = 1, #self do
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139 local r = math_random(i, len);
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140 self[i], self[r] = self[r], self[i];
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141 end
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142 return self;
918
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143 end
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144
7699
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145 function array_methods:append(ina)
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146 local len, len2 = #self, #ina;
7019
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147 for i = 1, len2 do
7699
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148 self[len+i] = ina[i];
1371
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149 end
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150 return self;
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151 end
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152
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153 function array_methods:push(x)
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154 t_insert(self, x);
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Waqas Hussain <waqas20@gmail.com>
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155 return self;
4440
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156 end
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157
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158 array_methods.pop = t_remove;
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159
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diff changeset
160 function array_methods:concat(sep)
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161 return t_concat(array.map(self, tostring), sep);
4440
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162 end
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163
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diff changeset
164 function array_methods:length()
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165 return #self;
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166 end
1905
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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167
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168 --- These methods always create a new array
1027
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parents: 922
diff changeset
169 function array.collect(f, s, var)
4387
06161b0b83f2 util.array: Fix array.collect() for iterators that expect initial value of var to be preserved
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parents: 3540
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170 local t = {};
1027
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parents: 922
diff changeset
171 while true do
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
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parents: 922
diff changeset
172 var = f(s, var);
7019
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parents: 6777
diff changeset
173 if var == nil then break; end
4449
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Waqas Hussain <waqas20@gmail.com>
parents: 4448
diff changeset
174 t_insert(t, var);
1027
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parents: 922
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175 end
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parents: 922
diff changeset
176 return setmetatable(t, array_mt);
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
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parents: 922
diff changeset
177 end
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
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parents: 922
diff changeset
178
1905
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parents: 1522
diff changeset
179 ---
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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180
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
181 -- Setup methods from array_base
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parents: 1522
diff changeset
182 for method, f in pairs(array_base) do
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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183 local base_method = f;
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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184 -- Setup global array method which makes new array
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
185 array[method] = function (old_a, ...)
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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186 local a = new_array();
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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187 return base_method(a, old_a, ...);
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
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188 end
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
189 -- Setup per-array (mutating) method
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
190 array_methods[method] = function (self, ...)
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
191 return base_method(self, self, ...);
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
192 end
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
Matthew Wild <mwild1@gmail.com>
parents: 1522
diff changeset
193 end
e3e0a17e0b33 util.array: Per-array methods now always mutate the array, array.* return a mutated copy, and most methods (e.g. sort) now return the array
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parents: 1522
diff changeset
194
1027
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parents: 922
diff changeset
195 return array;