prosody
120275376bbb
util/array.lua

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util/array.lua @ 1373:120275376bbb

util.array: Add support for + operator to create a new array from two arrays joined
author Matthew Wild <mwild1@gmail.com>
date Sat, 20 Jun 2009 22:47:12 +0100
parent 1372:3b13bb57002e
child 1522:569d58d21612
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1 local array = {};
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2
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3 local array_mt = { __index = array, __tostring = function (array) return array:concat(", "); end };
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4 local function new_array(_, t)
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5 return setmetatable(t or {}, array_mt);
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6 end
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7
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8 function array_mt.__add(a1, a2)
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9 local res = new_array();
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10 return res:append(a1):append(a2);
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11 end
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12
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13 setmetatable(array, { __call = new_array });
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14
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15 function array:map(func, t2)
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16 local t2 = t2 or array{};
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17 for k,v in ipairs(self) do
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18 t2[k] = func(v);
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19 end
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20 return t2;
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21 end
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23 function array:filter(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 if func(v) then
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27 t2:push(v);
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28 end
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29 end
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30 return t2;
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31 end
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34 array.push = table.insert;
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35 array.pop = table.remove;
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36 array.sort = table.sort;
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37 array.concat = table.concat;
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38 array.length = function (t) return #t; end
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39
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40 function array:random()
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41 return self[math.random(1,#self)];
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42 end
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43
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44 function array:shuffle()
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45 local len = #self;
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46 for i=1,#self do
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47 local r = math.random(i,len);
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48 self[i], self[r] = self[r], self[i];
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49 end
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50 return self;
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51 end
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52
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53 function array:reverse()
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54 local len = #self-1;
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55 for i=len,1,-1 do
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56 self:push(self[i]);
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57 self:pop(i);
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58 end
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59 return self;
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60 end
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61
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62 function array:append(array)
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63 local len,len2 = #self, #array;
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64 for i=1,len2 do
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65 self[len+i] = array[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.collect(f, s, var)
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71 local t, var = {};
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72 while true do
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73 var = f(s, var);
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74 if var == nil then break; end
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75 table.insert(t, var);
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76 end
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77 return setmetatable(t, array_mt);
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78 end
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80 _G.array = array;
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81 module("array");
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82
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83 return array;