prosody
12e5a54907b6
util/filters.lua

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util/filters.lua @ 7918:12e5a54907b6

util.crand: Clarify that lua_error does not return
author Kim Alvefur <zash@zash.se>
date Sat, 25 Feb 2017 18:12:24 +0100
parent 6777:5de6b93d0190
child 8555:4f0f5b49bb03
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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 local _ENV = nil;
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12
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13 local new_filter_hooks = {};
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14
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15 local 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 local 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 elseif filter_list[callback] then
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49 return; -- Filter already added
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50 end
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51
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52 priority = priority or 0;
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53
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54 local i = 0;
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55 repeat
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56 i = i + 1;
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57 until not filter_list[i] or filter_list[filter_list[i]] < priority;
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58
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59 t_insert(filter_list, i, callback);
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60 filter_list[callback] = priority;
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61 end
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62
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63 local function remove_filter(session, type, callback)
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64 if not session.filters then return; end
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65 local filter_list = session.filters[type];
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66 if filter_list and filter_list[callback] then
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67 for i=1, #filter_list do
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68 if filter_list[i] == callback then
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69 t_remove(filter_list, i);
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70 filter_list[callback] = nil;
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71 return true;
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72 end
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73 end
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74 end
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75 end
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76
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77 local function add_filter_hook(callback)
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78 t_insert(new_filter_hooks, callback);
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79 end
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80
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81 local function remove_filter_hook(callback)
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82 for i=1,#new_filter_hooks do
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83 if new_filter_hooks[i] == callback then
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84 t_remove(new_filter_hooks, i);
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85 end
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86 end
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87 end
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88
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89 return {
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90 initialize = initialize;
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91 add_filter = add_filter;
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92 remove_filter = remove_filter;
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93 add_filter_hook = add_filter_hook;
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94 remove_filter_hook = remove_filter_hook;
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95 };