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util/iterators.lua @ 1546:7d7bf705675d
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author | Matthew Wild <mwild1@gmail.com> |
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date | Mon, 13 Jul 2009 21:17:51 +0100 |
parent | 1522:569d58d21612 |
child | 1659:6092fc9b078b |
rev | line source |
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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 --[[ Iterators ]]-- |
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10 |
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11 -- Reverse an iterator |
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12 function reverse(f, s, var) |
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13 local results = {}; |
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14 |
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15 -- First call the normal iterator |
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16 while true do |
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17 local ret = { f(s, var) }; |
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18 var = ret[1]; |
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19 if var == nil then break; end |
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20 table.insert(results, 1, ret); |
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21 end |
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22 |
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23 -- Then return our reverse one |
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24 local i,max = 0, #results; |
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25 return function (results) |
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26 if i<max then |
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27 i = i + 1; |
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28 return unpack(results[i]); |
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29 end |
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30 end, results; |
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31 end |
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32 |
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33 -- Iterate only over keys in a table |
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34 local function _keys_it(t, key) |
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35 return (next(t, key)); |
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36 end |
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37 function keys(t) |
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38 return _keys_it, t; |
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39 end |
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40 |
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41 -- Iterate only over values in a table |
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42 function values(t) |
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43 local key, val; |
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44 return function (t) |
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45 key, val = next(t, key); |
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46 return val; |
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47 end, t; |
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48 end |
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49 |
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50 -- Given an iterator, iterate only over unique items |
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51 function unique(f, s, var) |
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52 local set = {}; |
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53 |
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54 return function () |
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55 while true do |
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56 local ret = { f(s, var) }; |
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57 var = ret[1]; |
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58 if var == nil then break; end |
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59 if not set[var] then |
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60 set[var] = true; |
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61 return var; |
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62 end |
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63 end |
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64 end; |
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65 end |
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66 |
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67 --[[ Return the number of items an iterator returns ]]-- |
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68 function count(f, s, var) |
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69 local x = 0; |
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70 |
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71 while true do |
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72 local ret = { f(s, var) }; |
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73 var = ret[1]; |
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74 if var == nil then break; end |
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75 x = x + 1; |
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76 end |
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77 |
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78 return x; |
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79 end |
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80 |
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81 -- Convert the values returned by an iterator to an array |
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82 function it2array(f, s, var) |
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83 local t, var = {}; |
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84 while true do |
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85 var = f(s, var); |
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86 if var == nil then break; end |
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87 table.insert(t, var); |
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88 end |
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89 return t; |
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90 end |
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91 |
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92 -- Treat the return of an iterator as key,value pairs, |
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93 -- and build a table |
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94 function it2table(f, s, var) |
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95 local t, var = {}; |
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96 while true do |
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97 var, var2 = f(s, var); |
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98 if var == nil then break; end |
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99 t[var] = var2; |
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100 end |
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101 return t; |
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102 end |