prosody
2660407c3b73
util/iterators.lua

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util/iterators.lua @ 5468:2660407c3b73

util.iterators: Add ripairs() (ipairs() in reverse) (thanks Maranda)
author Matthew Wild <mwild1@gmail.com>
date Fri, 12 Apr 2013 00:44:49 +0100
parent 4545:c9b91ddc9c11
child 5581:167c1da54606
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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 --[[ Iterators ]]--
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10
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11 local it = {};
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12
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13 -- Reverse an iterator
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14 function it.reverse(f, s, var)
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15 local results = {};
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16
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17 -- First call the normal iterator
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18 while true do
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19 local ret = { f(s, var) };
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20 var = ret[1];
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21 if var == nil then break; end
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22 table.insert(results, 1, ret);
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23 end
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24
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25 -- Then return our reverse one
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26 local i,max = 0, #results;
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27 return function (results)
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28 if i<max then
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29 i = i + 1;
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30 return unpack(results[i]);
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31 end
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32 end, results;
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33 end
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34
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35 -- Iterate only over keys in a table
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36 local function _keys_it(t, key)
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37 return (next(t, key));
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38 end
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39 function it.keys(t)
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40 return _keys_it, t;
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41 end
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42
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43 -- Iterate only over values in a table
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44 function it.values(t)
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45 local key, val;
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46 return function (t)
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47 key, val = next(t, key);
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48 return val;
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49 end, t;
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50 end
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51
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52 -- Given an iterator, iterate only over unique items
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53 function it.unique(f, s, var)
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54 local set = {};
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55
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56 return function ()
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57 while true do
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58 local ret = { f(s, var) };
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59 var = ret[1];
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60 if var == nil then break; end
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61 if not set[var] then
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62 set[var] = true;
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63 return var;
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64 end
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65 end
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66 end;
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67 end
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68
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69 --[[ Return the number of items an iterator returns ]]--
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70 function it.count(f, s, var)
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71 local x = 0;
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72
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73 while true do
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74 local ret = { f(s, var) };
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75 var = ret[1];
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76 if var == nil then break; end
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77 x = x + 1;
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78 end
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79
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80 return x;
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81 end
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82
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83 -- Return the first n items an iterator returns
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84 function it.head(n, f, s, var)
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85 local c = 0;
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86 return function (s, var)
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87 if c >= n then
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88 return nil;
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89 end
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90 c = c + 1;
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91 return f(s, var);
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92 end, s;
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93 end
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94
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95 -- Skip the first n items an iterator returns
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96 function it.skip(n, f, s, var)
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97 for i=1,n do
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98 var = f(s, var);
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99 end
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100 return f, s, var;
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101 end
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102
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103 -- Return the last n items an iterator returns
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104 function it.tail(n, f, s, var)
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105 local results, count = {}, 0;
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106 while true do
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107 local ret = { f(s, var) };
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108 var = ret[1];
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109 if var == nil then break; end
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110 results[(count%n)+1] = ret;
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111 count = count + 1;
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112 end
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113
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114 if n > count then n = count; end
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115
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116 local pos = 0;
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117 return function ()
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118 pos = pos + 1;
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119 if pos > n then return nil; end
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120 return unpack(results[((count-1+pos)%n)+1]);
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121 end
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122 --return reverse(head(n, reverse(f, s, var)));
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123 end
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124
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125 local function _ripairs_iter(t, key) if key > 1 then return key-1, t[key-1]; end end
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126 function it.ripairs(t)
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127 return _ripairs_iter, t, #t+1;
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128 end
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129
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130 local function _range_iter(max, curr) if curr < max then return curr + 1; end end
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131 function it.range(x, y)
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132 if not y then x, y = 1, x; end -- Default to 1..x if y not given
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133 return _range_iter, y, x-1;
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134 end
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135
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136 -- Convert the values returned by an iterator to an array
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137 function it.to_array(f, s, var)
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138 local t, var = {};
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139 while true do
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140 var = f(s, var);
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141 if var == nil then break; end
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142 table.insert(t, var);
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143 end
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144 return t;
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145 end
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146
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147 -- Treat the return of an iterator as key,value pairs,
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148 -- and build a table
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149 function it.to_table(f, s, var)
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150 local t, var2 = {};
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151 while true do
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152 var, var2 = f(s, var);
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153 if var == nil then break; end
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154 t[var] = var2;
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155 end
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156 return t;
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157 end
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158
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159 return it;