prosody
3cf02e5e632b
util/filters.lua

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util/filters.lua @ 3142:3cf02e5e632b

util.filters: Ensure initialize() never initializes an object twice - and return the filter function to the caller
author Matthew Wild <mwild1@gmail.com>
date Wed, 02 Jun 2010 17:23:57 +0100
parent 3140:8c6ed6fd2d35
child 3331:57a9cf5f4259
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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 if not session.filters then
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15 local filters = {};
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16 session.filters = filters;
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17
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18 function session.filter(type, data)
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19 local filter_list = filters[type];
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20 if filter_list then
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21 for i = 1, #filter_list do
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22 data = filter_list[i](data);
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23 if data == nil then break; end
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24 end
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25 end
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26 return data;
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27 end
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28 end
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29 return session.filter;
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30 end
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31
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32 function add_filter(session, type, callback, priority)
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33 if not session.filters then
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34 initialize(session);
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35 end
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36
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37 local filter_list = session.filters[type];
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38 if not filter_list then
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39 filter_list = {};
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40 session.filters[type] = filter_list;
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41 end
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42
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43 priority = priority or 0;
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44
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45 local i = 0;
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46 repeat
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47 i = i + 1;
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48 until not filter_list[i] or filter_list[filter_list[i]] >= priority;
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49
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50 t_insert(filter_list, i, callback);
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51 filter_list[callback] = priority;
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52 end
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53
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54 function remove_filter(session, type, callback)
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55 if not session.filters then return; end
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56 local filter_list = session.filters[type];
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57 if filter_list and filter_list[callback] then
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58 for i=1, #filter_list do
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59 if filter_list[i] == callback then
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60 t_remove(filter_list, i);
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61 filter_list[callback] = nil;
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62 return true;
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63 end
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64 end
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65 end
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66 end
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67
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68 return _M;