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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local pairs = pairs;
local t_insert = table.insert;
local t_sort = table.sort;
module "events"
function new()
local handlers = {};
local event_map = {};
local function _rebuild_index(event) -- TODO optimize index rebuilding
local _handlers = event_map[event];
local index = handlers[event];
if index then
for i=#index,1,-1 do index[i] = nil; end
else index = {}; handlers[event] = index; end
for handler in pairs(_handlers) do
t_insert(index, handler);
end
t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
end;
local function add_handler(event, handler, priority)
local map = event_map[event];
if map then
map[handler] = priority or 0;
else
map = {[handler] = priority or 0};
event_map[event] = map;
end
_rebuild_index(event);
end;
local function remove_handler(event, handler)
local map = event_map[event];
if map then
map[handler] = nil;
_rebuild_index(event);
end
end;
local function add_handlers(handlers)
for event, handler in pairs(handlers) do
add_handler(event, handler);
end
end;
local function remove_handlers(handlers)
for event, handler in pairs(handlers) do
remove_handler(event, handler);
end
end;
local function fire_event(event, ...)
local h = handlers[event];
if h then
for i=1,#h do
local ret = h[i](...);
if ret ~= nil then return ret; end
end
end
end;
return {
add_handler = add_handler;
remove_handler = remove_handler;
add_handlers = add_handlers;
remove_handlers = remove_handlers;
fire_event = fire_event;
_handlers = handlers;
_event_map = event_map;
};
end
return _M;
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