prosody
b7049746bd29
util/events.lua

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util/events.lua @ 2923:b7049746bd29

Update copyright headers for 2010
author Matthew Wild <mwild1@gmail.com>
date Mon, 22 Mar 2010 17:06:15 +0000
parent 1522:569d58d21612
child 2925:692b3c6c5bd2
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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
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10 local ipairs = ipairs;
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11 local pairs = pairs;
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12 local t_insert = table.insert;
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13 local t_sort = table.sort;
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14 local select = select;
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15
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16 module "events"
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17
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18 function new()
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19 local dispatchers = {};
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20 local handlers = {};
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21 local event_map = {};
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22 local function _rebuild_index(event) -- TODO optimize index rebuilding
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23 local _handlers = event_map[event];
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24 local index = handlers[event];
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25 if index then
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26 for i=#index,1,-1 do index[i] = nil; end
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27 else index = {}; handlers[event] = index; end
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28 for handler in pairs(_handlers) do
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29 t_insert(index, handler);
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30 end
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31 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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32 end;
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33 local function add_handler(event, handler, priority)
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34 local map = event_map[event];
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35 if map then
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36 map[handler] = priority or 0;
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37 else
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38 map = {[handler] = priority or 0};
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39 event_map[event] = map;
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40 end
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41 _rebuild_index(event);
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42 end;
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43 local function remove_handler(event, handler)
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44 local map = event_map[event];
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45 if map then
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46 map[handler] = nil;
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47 _rebuild_index(event);
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48 end
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49 end;
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50 local function add_plugin(plugin)
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51 for event, handler in pairs(plugin) do
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52 add_handler(event, handler);
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53 end
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54 end;
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55 local function remove_plugin(plugin)
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56 for event, handler in pairs(plugin) do
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57 remove_handler(event, handler);
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58 end
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59 end;
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60 local function _create_dispatcher(event) -- FIXME duplicate code in fire_event
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61 local h = handlers[event];
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62 if not h then h = {}; handlers[event] = h; end
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63 local dispatcher = function(...)
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64 for i=1,#h do
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65 local ret = h[i](...);
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66 if ret ~= nil then return ret; end
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67 end
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68 end;
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69 dispatchers[event] = dispatcher;
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70 return dispatcher;
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71 end;
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72 local function get_dispatcher(event)
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73 return dispatchers[event] or _create_dispatcher(event);
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74 end;
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75 local function fire_event(event, ...) -- FIXME duplicates dispatcher code
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76 local h = handlers[event];
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77 if h then
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78 for i=1,#h do
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79 local ret = h[i](...);
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80 if ret ~= nil then return ret; end
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81 end
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82 end
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83 end;
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84 local function get_named_arg_dispatcher(event, ...)
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85 local dispatcher = get_dispatcher(event);
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86 local keys = {...};
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87 local data = {};
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88 return function(...)
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89 for i, key in ipairs(keys) do data[key] = select(i, ...); end
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90 dispatcher(data);
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91 end;
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92 end;
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93 return {
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94 add_handler = add_handler;
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95 remove_handler = remove_handler;
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96 add_plugin = add_plugin;
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97 remove_plugin = remove_plugin;
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98 get_dispatcher = get_dispatcher;
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99 fire_event = fire_event;
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100 get_named_arg_dispatcher = get_named_arg_dispatcher;
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101 _dispatchers = dispatchers;
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102 _handlers = handlers;
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103 _event_map = event_map;
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104 };
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105 end
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106
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107 return _M;