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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_remove = table.remove;
local t_sort = table.sort;
local setmetatable = setmetatable;
local next = next;
local _ENV = nil;
local function new()
-- Map event name to ordered list of handlers (lazily built): handlers[event_name] = array_of_handler_functions
local handlers = {};
-- Array of wrapper functions that wrap all events (nil if empty)
local global_wrappers;
-- Per-event wrappers: wrappers[event_name] = wrapper_function
local wrappers = {};
-- Event map: event_map[handler_function] = priority_number
local event_map = {};
-- Called on-demand to build handlers entries
local function _rebuild_index(handlers, event)
local _handlers = event_map[event];
if not _handlers or next(_handlers) == nil then return; end
local index = {};
for handler in pairs(_handlers) do
t_insert(index, handler);
end
t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end);
handlers[event] = index;
return index;
end;
setmetatable(handlers, { __index = _rebuild_index });
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
handlers[event] = nil;
end;
local function remove_handler(event, handler)
local map = event_map[event];
if map then
map[handler] = nil;
handlers[event] = nil;
if next(map) == nil then
event_map[event] = nil;
end
end
end;
local function get_handlers(event)
return handlers[event];
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_name, event_data)
local h = handlers[event_name];
if h then
for i=1,#h do
local ret = h[i](event_data);
if ret ~= nil then return ret; end
end
end
end;
local function fire_event(event_name, event_data)
local w = wrappers[event_name] or global_wrappers;
if w then
local curr_wrapper = #w;
local function c(event_name, event_data)
curr_wrapper = curr_wrapper - 1;
if curr_wrapper == 0 then
if global_wrappers == nil or w == global_wrappers then
return _fire_event(event_name, event_data);
end
w, curr_wrapper = global_wrappers, #global_wrappers;
return w[curr_wrapper](c, event_name, event_data);
else
return w[curr_wrapper](c, event_name, event_data);
end
end
return w[curr_wrapper](c, event_name, event_data);
end
return _fire_event(event_name, event_data);
end
local function add_wrapper(event_name, wrapper)
local w;
if event_name == false then
w = global_wrappers;
if not w then
w = {};
global_wrappers = w;
end
else
w = wrappers[event_name];
if not w then
w = {};
wrappers[event_name] = w;
end
end
w[#w+1] = wrapper;
end
local function remove_wrapper(event_name, wrapper)
local w;
if event_name == false then
w = global_wrappers;
else
w = wrappers[event_name];
end
if not w then return; end
for i = #w, 1 do
if w[i] == wrapper then
t_remove(w, i);
end
end
if #w == 0 then
if event_name == false then
global_wrappers = nil;
else
wrappers[event_name] = nil;
end
end
end
return {
add_handler = add_handler;
remove_handler = remove_handler;
add_handlers = add_handlers;
remove_handlers = remove_handlers;
get_handlers = get_handlers;
wrappers = {
add_handler = add_wrapper;
remove_handler = remove_wrapper;
};
add_wrapper = add_wrapper;
remove_wrapper = remove_wrapper;
fire_event = fire_event;
_handlers = handlers;
_event_map = event_map;
};
end
return {
new = new;
};
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