prosody
569d58d21612
util/array.lua

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util/array.lua @ 1522:569d58d21612

Add copyright header to those files missing one
author Matthew Wild <mwild1@gmail.com>
date Fri, 10 Jul 2009 03:08:38 +0100
parent 1373:120275376bbb
child 1905:e3e0a17e0b33
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1522
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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 array = {};
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11 local array_mt = { __index = array, __tostring = function (array) return array:concat(", "); end };
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12 local function new_array(_, t)
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13 return setmetatable(t or {}, array_mt);
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14 end
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15
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16 function array_mt.__add(a1, a2)
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17 local res = new_array();
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18 return res:append(a1):append(a2);
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19 end
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20
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21 setmetatable(array, { __call = new_array });
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22
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23 function array:map(func, t2)
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24 local t2 = t2 or array{};
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25 for k,v in ipairs(self) do
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26 t2[k] = func(v);
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27 end
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28 return t2;
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29 end
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30
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31 function array:filter(func, t2)
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32 local t2 = t2 or array{};
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33 for k,v in ipairs(self) do
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34 if func(v) then
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35 t2:push(v);
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36 end
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37 end
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38 return t2;
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39 end
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41
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42 array.push = table.insert;
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43 array.pop = table.remove;
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44 array.sort = table.sort;
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45 array.concat = table.concat;
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46 array.length = function (t) return #t; end
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47
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48 function array:random()
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49 return self[math.random(1,#self)];
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50 end
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51
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52 function array:shuffle()
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53 local len = #self;
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54 for i=1,#self do
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55 local r = math.random(i,len);
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56 self[i], self[r] = self[r], self[i];
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57 end
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58 return self;
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59 end
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60
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61 function array:reverse()
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62 local len = #self-1;
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63 for i=len,1,-1 do
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64 self:push(self[i]);
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65 self:pop(i);
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66 end
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67 return self;
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68 end
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69
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70 function array:append(array)
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71 local len,len2 = #self, #array;
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72 for i=1,len2 do
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73 self[len+i] = array[i];
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74 end
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75 return self;
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76 end
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77
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78 function array.collect(f, s, var)
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79 local t, var = {};
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80 while true do
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81 var = f(s, var);
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82 if var == nil then break; end
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83 table.insert(t, var);
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84 end
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85 return setmetatable(t, array_mt);
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86 end
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87
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88 _G.array = array;
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89 module("array");
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90
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91 return array;