prosody
e6fed1d80116
util/iterators.lua

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util/iterators.lua @ 5915:e6fed1d80116

Back out 1b0ac7950129, as SSLv3 appears to still be in moderate use on the network. Also, although obsolete, SSLv3 isn't documented to have any weaknesses that TLS 1.0 (the most common version used today) doesn't also have. Get your act together clients!
author Matthew Wild <mwild1@gmail.com>
date Tue, 12 Nov 2013 02:13:01 +0000
parent 5468:2660407c3b73
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;