1 files changed, 85 insertions, 7 deletions

diff --git a/util/events.lua b/util/events.lua
index 412acccd..e2943e44 100644
--- a/util/events.lua
+++ b/util/events.lua
@@ -1,7 +1,7 @@
 -- 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.
 --
@@ -9,15 +9,23 @@
 
 local pairs = pairs;
 local t_insert = table.insert;
+local t_remove = table.remove;
 local t_sort = table.sort;
 local setmetatable = setmetatable;
 local next = next;
 
-module "events"
+local _ENV = nil;
 
-function new()
+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
@@ -50,6 +58,9 @@ function new()
 			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);
@@ -60,24 +71,91 @@ function new()
 			remove_handler(event, handler);
 		end
 	end;
-	local function fire_event(event, ...)
-		local h = handlers[event];
+	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](...);
+				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 _M;
+return {
+	new = new;
+};