prosody
f29a297471e3
util/filters.lua

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util/filters.lua @ 3135:f29a297471e3

util.filters: Don't traceback when trying to remove a filter from an uninitialized object
author Matthew Wild <mwild1@gmail.com>
date Wed, 02 Jun 2010 12:24:07 +0100
parent 3134:9a29ad6a9b97
child 3139:7b4f180d7c6f
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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 local t_insert, t_remove = table.insert, table.remove;
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10
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11 module "filters"
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12
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13 function initialize(session)
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14 local filters = {};
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15 session.filters = filters;
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16
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17 function session.filter(type, data)
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18 local filter_list = filters[type];
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19 for i = 1, #filter_list do
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20 data = filter_list[i](data);
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21 end
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22 return data;
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23 end
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24 end
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25
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26 function add_filter(session, type, callback, priority)
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27 if not session.filters then
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28 initialize(session);
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29 end
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30
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31 local filter_list = session.filters[type];
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32 if not filter_list then
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33 filter_list = {};
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34 session.filters[type] = filter_list;
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35 end
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36
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37 priority = priority or 0;
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38
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39 local i = 0;
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40 repeat
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41 i = i + 1;
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42 until not filter_list[i] or filter_list[filter_list[i]] >= priority;
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43
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44 t_insert(filter_list, i, callback);
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45 filter_list[callback] = priority;
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46 end
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47
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48 function remove_filter(session, type, callback)
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49 if not session.filters then return; end
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50 local filter_list = session.filters[type];
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51 if filter_list and filter_list[callback] then
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52 for i=1, #filter_list do
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53 if filter_list[i] == callback then
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54 t_remove(filter_list, i);
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55 filter_list[callback] = nil;
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56 return true;
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57 end
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58 end
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59 end
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60 end
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61
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62 return _M;