-- 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 t_insert, t_remove = table.insert, table.remove;
-module "filters"
+local _ENV = nil;
local new_filter_hooks = {};
-function initialize(session)
+local function initialize(session)
if not session.filters then
local filters = {};
session.filters = filters;
-
+
function session.filter(type, data)
local filter_list = filters[type];
if filter_list then
return data;
end
end
-
+
for i=1,#new_filter_hooks do
new_filter_hooks[i](session);
end
-
+
return session.filter;
end
-function add_filter(session, type, callback, priority)
+local function add_filter(session, type, callback, priority)
if not session.filters then
initialize(session);
end
-
+
local filter_list = session.filters[type];
if not filter_list then
filter_list = {};
session.filters[type] = filter_list;
+ elseif filter_list[callback] then
+ return; -- Filter already added
end
-
+
priority = priority or 0;
-
+
local i = 0;
repeat
i = i + 1;
- until not filter_list[i] or filter_list[filter_list[i]] >= priority;
-
+ until not filter_list[i] or filter_list[filter_list[i]] < priority;
+
t_insert(filter_list, i, callback);
filter_list[callback] = priority;
end
-function remove_filter(session, type, callback)
+local function remove_filter(session, type, callback)
if not session.filters then return; end
local filter_list = session.filters[type];
if filter_list and filter_list[callback] then
end
end
-function add_filter_hook(callback)
+local function add_filter_hook(callback)
t_insert(new_filter_hooks, callback);
end
-function remove_filter_hook(callback)
+local function remove_filter_hook(callback)
for i=1,#new_filter_hooks do
if new_filter_hooks[i] == callback then
t_remove(new_filter_hooks, i);
end
end
-return _M;
+return {
+ initialize = initialize;
+ add_filter = add_filter;
+ remove_filter = remove_filter;
+ add_filter_hook = add_filter_hook;
+ remove_filter_hook = remove_filter_hook;
+};