prosody
5ac99cd46545
util/array.lua

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util/array.lua @ 1921:5ac99cd46545

util.array: Fix for array:filter() (in-place filtering)
author Matthew Wild <mwild1@gmail.com>
date Mon, 05 Oct 2009 17:56:31 +0100
parent 1918:dd35d07d673f
child 1922:d5fe0f9b377a
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 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 array = {};
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13 local array_base = {};
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14 local array_methods = {};
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15 local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end };
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16
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17 local function new_array(_, t)
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18 return setmetatable(t or {}, array_mt);
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19 end
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20
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21 function array_mt.__add(a1, a2)
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22 local res = new_array();
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23 return res:append(a1):append(a2);
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24 end
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25
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26 setmetatable(array, { __call = new_array });
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28 function array_base.map(outa, ina, func)
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29 for k,v in ipairs(ina) do
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30 outa[k] = func(v);
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31 end
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32 return outa;
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33 end
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35 function array_base.filter(outa, ina, func)
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36 local inplace, start_length = ina == outa, #ina;
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37 local write = 1;
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38 for read=1,start_length do
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39 local v = ina[read];
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40 if func(v) then
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41 outa[write] = v;
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42 write = write + 1;
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43 end
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44 end
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45
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46 if inplace and write < start_length then
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47 for i=write,start_length do
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48 outa[i] = nil;
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49 end
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50 end
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51
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52 return outa;
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53 end
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54
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55 function array_base.sort(outa, ina, ...)
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56 if ina ~= outa then
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57 outa:append(ina);
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58 end
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59 t_sort(outa, ...);
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60 return outa;
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61 end
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62
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63 --- These methods only mutate
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64 function array_methods:random()
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65 return self[math.random(1,#self)];
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66 end
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67
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68 function array_methods:shuffle(outa, ina)
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69 local len = #self;
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70 for i=1,#self do
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71 local r = math.random(i,len);
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72 self[i], self[r] = self[r], self[i];
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73 end
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74 return self;
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75 end
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76
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77 function array_methods:reverse()
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78 local len = #self-1;
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79 for i=len,1,-1 do
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80 self:push(self[i]);
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81 self:pop(i);
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82 end
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83 return self;
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84 end
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85
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86 function array_methods:append(array)
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87 local len,len2 = #self, #array;
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88 for i=1,len2 do
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89 self[len+i] = array[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 array_methods.push = table.insert;
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95 array_methods.pop = table.remove;
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96 array_methods.concat = table.concat;
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97 array_methods.length = function (t) return #t; end
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98
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99 --- These methods always create a new array
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100 function array.collect(f, s, var)
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101 local t, var = {};
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102 while true do
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103 var = f(s, var);
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104 if var == nil then break; end
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105 table.insert(t, var);
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106 end
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107 return setmetatable(t, array_mt);
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108 end
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109
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110 ---
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111
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112 -- Setup methods from array_base
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113 for method, f in pairs(array_base) do
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114 local method = method; -- Yes, this is necessary :)
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115 local base_method = f;
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116 -- Setup global array method which makes new array
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117 array[method] = function (old_a, ...)
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118 local a = new_array();
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119 return base_method(a, old_a, ...);
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120 end
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121 -- Setup per-array (mutating) method
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122 array_methods[method] = function (self, ...)
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123 return base_method(self, self, ...);
dd35d07d673f 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
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124 end
dd35d07d673f 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
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125 end
dd35d07d673f 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
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126
1027
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
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127 _G.array = array;
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
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128 module("array");
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
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129
fe2e3d3dba6a util.array: Add array.collect() to collect results from iterators into an array, and use module() to correctly set the module name
Matthew Wild <mwild1@gmail.com>
parents: 922
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130 return array;