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util/filters.lua @ 3689:2ca76b4f6404
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author | Waqas Hussain <waqas20@gmail.com> |
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date | Fri, 03 Dec 2010 00:04:32 +0500 |
parent | 3625:f8d61da5bcc1 |
child | 3943:ad5924c31953 |
rev | line source |
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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 local new_filter_hooks = {}; |
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14 |
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15 function initialize(session) |
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16 if not session.filters then |
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17 local filters = {}; |
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18 session.filters = filters; |
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19 |
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20 function session.filter(type, data) |
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21 local filter_list = filters[type]; |
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22 if filter_list then |
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23 for i = 1, #filter_list do |
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24 data = filter_list[i](data, session); |
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25 if data == nil then break; end |
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26 end |
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27 end |
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28 return data; |
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29 end |
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30 end |
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31 |
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32 for i=1,#new_filter_hooks do |
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33 new_filter_hooks[i](session); |
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34 end |
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35 |
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36 return session.filter; |
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37 end |
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38 |
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39 function add_filter(session, type, callback, priority) |
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40 if not session.filters then |
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41 initialize(session); |
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42 end |
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43 |
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44 local filter_list = session.filters[type]; |
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45 if not filter_list then |
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46 filter_list = {}; |
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47 session.filters[type] = filter_list; |
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48 end |
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49 |
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50 priority = priority or 0; |
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51 |
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52 local i = 0; |
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53 repeat |
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54 i = i + 1; |
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55 until not filter_list[i] or filter_list[filter_list[i]] >= priority; |
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56 |
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57 t_insert(filter_list, i, callback); |
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58 filter_list[callback] = priority; |
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59 end |
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60 |
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61 function remove_filter(session, type, callback) |
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62 if not session.filters then return; end |
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63 local filter_list = session.filters[type]; |
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64 if filter_list and filter_list[callback] then |
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65 for i=1, #filter_list do |
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66 if filter_list[i] == callback then |
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67 t_remove(filter_list, i); |
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68 filter_list[callback] = nil; |
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69 return true; |
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70 end |
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71 end |
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72 end |
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73 end |
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74 |
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75 function add_filter_hook(callback) |
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76 t_insert(new_filter_hooks, callback); |
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77 end |
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78 |
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79 return _M; |