prosody
0c077800cd70
util/events.lua

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util/events.lua @ 8681:0c077800cd70

util.async: Make parameters to async.runner() optional
author Matthew Wild <mwild1@gmail.com>
date Fri, 23 Mar 2018 14:02:33 +0000
parent 8555:4f0f5b49bb03
child 8759:9e839fb4541a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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10 local pairs = pairs;
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11 local t_insert = table.insert;
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12 local t_remove = table.remove;
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13 local t_sort = table.sort;
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14 local setmetatable = setmetatable;
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15 local next = next;
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16
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17 local _ENV = nil;
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18 -- luacheck: std none
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19
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20 local function new()
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21 -- Map event name to ordered list of handlers (lazily built): handlers[event_name] = array_of_handler_functions
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22 local handlers = {};
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23 -- Array of wrapper functions that wrap all events (nil if empty)
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24 local global_wrappers;
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25 -- Per-event wrappers: wrappers[event_name] = wrapper_function
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26 local wrappers = {};
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27 -- Event map: event_map[handler_function] = priority_number
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28 local event_map = {};
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29 -- Called on-demand to build handlers entries
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30 local function _rebuild_index(self, event)
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31 local _handlers = event_map[event];
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32 if not _handlers or next(_handlers) == nil then return; end
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33 local index = {};
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34 for handler in pairs(_handlers) do
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35 t_insert(index, handler);
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36 end
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37 t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
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38 self[event] = index;
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39 return index;
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40 end;
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41 setmetatable(handlers, { __index = _rebuild_index });
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42 local function add_handler(event, handler, priority)
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43 local map = event_map[event];
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44 if map then
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45 map[handler] = priority or 0;
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46 else
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47 map = {[handler] = priority or 0};
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48 event_map[event] = map;
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49 end
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50 handlers[event] = nil;
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51 end;
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52 local function remove_handler(event, handler)
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53 local map = event_map[event];
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54 if map then
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55 map[handler] = nil;
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56 handlers[event] = nil;
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57 if next(map) == nil then
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58 event_map[event] = nil;
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59 end
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60 end
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61 end;
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62 local function get_handlers(event)
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63 return handlers[event];
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64 end;
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65 local function add_handlers(self)
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66 for event, handler in pairs(self) do
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67 add_handler(event, handler);
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68 end
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69 end;
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70 local function remove_handlers(self)
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71 for event, handler in pairs(self) do
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72 remove_handler(event, handler);
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73 end
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74 end;
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75 local function _fire_event(event_name, event_data)
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76 local h = handlers[event_name];
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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](event_data);
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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 fire_event(event_name, event_data)
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85 -- luacheck: ignore 432/event_name 432/event_data
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86 local w = wrappers[event_name] or global_wrappers;
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87 if w then
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88 local curr_wrapper = #w;
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89 local function c(event_name, event_data)
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90 curr_wrapper = curr_wrapper - 1;
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91 if curr_wrapper == 0 then
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92 if global_wrappers == nil or w == global_wrappers then
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93 return _fire_event(event_name, event_data);
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94 end
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95 w, curr_wrapper = global_wrappers, #global_wrappers;
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96 return w[curr_wrapper](c, event_name, event_data);
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97 else
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98 return w[curr_wrapper](c, event_name, event_data);
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99 end
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100 end
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101 return w[curr_wrapper](c, event_name, event_data);
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102 end
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103 return _fire_event(event_name, event_data);
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104 end
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105 local function add_wrapper(event_name, wrapper)
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106 local w;
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107 if event_name == false then
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108 w = global_wrappers;
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109 if not w then
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110 w = {};
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111 global_wrappers = w;
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112 end
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113 else
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114 w = wrappers[event_name];
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115 if not w then
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116 w = {};
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117 wrappers[event_name] = w;
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118 end
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119 end
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120 w[#w+1] = wrapper;
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121 end
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122 local function remove_wrapper(event_name, wrapper)
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123 local w;
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124 if event_name == false then
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125 w = global_wrappers;
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126 else
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127 w = wrappers[event_name];
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128 end
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129 if not w then return; end
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130 for i = #w, 1 do
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131 if w[i] == wrapper then
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132 t_remove(w, i);
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133 end
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134 end
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135 if #w == 0 then
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136 if event_name == false then
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137 global_wrappers = nil;
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138 else
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139 wrappers[event_name] = nil;
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140 end
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141 end
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142 end
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143 return {
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144 add_handler = add_handler;
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145 remove_handler = remove_handler;
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146 add_handlers = add_handlers;
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147 remove_handlers = remove_handlers;
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148 get_handlers = get_handlers;
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149 wrappers = {
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150 add_handler = add_wrapper;
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151 remove_handler = remove_wrapper;
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152 };
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153 add_wrapper = add_wrapper;
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154 remove_wrapper = remove_wrapper;
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155 fire_event = fire_event;
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156 _handlers = handlers;
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157 _event_map = event_map;
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158 };
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159 end
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160
6777
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161 return {
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162 new = new;
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163 };