Thu, 01 Jul 2010 13:27:51 +0100
configure: Add ostype preset for FreeBSD (thanks dersd and tobias (no, the other one))
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util.filters: New utility library for managing filters on an object
Matthew Wild <mwild1@gmail.com>
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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; |