prosody
fbd1ebd86369
util/filters.lua

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util/filters.lua @ 11576:fbd1ebd86369

teal: Add new util.hashes APIs
author Kim Alvefur <zash@zash.se>
date Thu, 20 May 2021 23:09:45 +0200
parent 8555:4f0f5b49bb03
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rev   line source
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d3f16b4c1ecb util.filters: New utility library for managing filters on an object
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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 -- luacheck: std none
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13
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14 local new_filter_hooks = {};
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15
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16 local function initialize(session)
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17 if not session.filters then
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18 local filters = {};
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19 session.filters = filters;
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20
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21 function session.filter(type, data)
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22 local filter_list = filters[type];
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23 if filter_list then
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24 for i = 1, #filter_list do
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25 data = filter_list[i](data, session);
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26 if data == nil then break; end
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27 end
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28 end
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29 return data;
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30 end
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31 end
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32
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33 for i=1,#new_filter_hooks do
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34 new_filter_hooks[i](session);
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35 end
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36
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37 return session.filter;
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38 end
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39
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40 local function add_filter(session, type, callback, priority)
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41 if not session.filters then
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42 initialize(session);
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43 end
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44
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45 local filter_list = session.filters[type];
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46 if not filter_list then
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47 filter_list = {};
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48 session.filters[type] = filter_list;
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49 elseif filter_list[callback] then
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50 return; -- Filter already added
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51 end
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52
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53 priority = priority or 0;
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54
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55 local i = 0;
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56 repeat
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57 i = i + 1;
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58 until not filter_list[i] or filter_list[filter_list[i]] < priority;
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59
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60 t_insert(filter_list, i, callback);
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61 filter_list[callback] = priority;
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62 end
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63
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64 local function remove_filter(session, type, callback)
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65 if not session.filters then return; end
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66 local filter_list = session.filters[type];
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67 if filter_list and filter_list[callback] then
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68 for i=1, #filter_list do
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69 if filter_list[i] == callback then
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70 t_remove(filter_list, i);
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71 filter_list[callback] = nil;
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72 return true;
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73 end
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74 end
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75 end
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76 end
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77
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78 local function add_filter_hook(callback)
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79 t_insert(new_filter_hooks, callback);
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80 end
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81
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82 local function remove_filter_hook(callback)
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83 for i=1,#new_filter_hooks do
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84 if new_filter_hooks[i] == callback then
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85 t_remove(new_filter_hooks, i);
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86 end
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87 end
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88 end
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89
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90 return {
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91 initialize = initialize;
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92 add_filter = add_filter;
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93 remove_filter = remove_filter;
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94 add_filter_hook = add_filter_hook;
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95 remove_filter_hook = remove_filter_hook;
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96 };