Annotate

tools/migration/migrator/mtools.lua @ 5233:342c46e62f50

mod_http_files: Return 404 faster if file does not exist
author Kim Alvefur <zash@zash.se>
date Tue, 11 Dec 2012 22:26:41 +0100
parent 4216:ff80a8471e86
child 7881:4e3067272fae
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2
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3 local print = print;
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4 local t_insert = table.insert;
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5 local t_sort = table.sort;
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6
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7 module "mtools"
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8
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9 function sorted(params)
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11 local reader = params.reader; -- iterator to get items from
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12 local sorter = params.sorter; -- sorting function
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13 local filter = params.filter; -- filter function
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14
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15 local cache = {};
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16 for item in reader do
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17 if filter then item = filter(item); end
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18 if item then t_insert(cache, item); end
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19 end
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20 if sorter then
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21 t_sort(cache, sorter);
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22 end
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23 local i = 0;
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24 return function()
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25 i = i + 1;
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26 return cache[i];
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27 end;
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28
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29 end
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30
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31 function merged(reader, merger)
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32
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33 local item1 = reader();
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34 local merged = { item1 };
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35 return function()
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36 while true do
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37 if not item1 then return nil; end
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38 local item2 = reader();
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39 if not item2 then item1 = nil; return merged; end
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40 if merger(item1, item2) then
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41 --print("merged")
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42 item1 = item2;
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43 t_insert(merged, item1);
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44 else
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45 --print("unmerged", merged)
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46 item1 = item2;
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47 local tmp = merged;
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48 merged = { item1 };
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49 return tmp;
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50 end
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51 end
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52 end;
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53
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54 end
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55
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56 return _M;