author | Matthew Wild <mwild1@gmail.com> |
Wed, 02 Jun 2010 13:31:36 +0100 | |
changeset 3140 | 8c6ed6fd2d35 |
parent 3139 | 7b4f180d7c6f |
child 3142 | 3cf02e5e632b |
permissions | -rw-r--r-- |
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util.filters: New utility library for managing filters on an object
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-- Prosody IM |
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-- Copyright (C) 2008-2010 Matthew Wild |
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-- Copyright (C) 2008-2010 Waqas Hussain |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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local t_insert, t_remove = table.insert, table.remove; |
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module "filters" |
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util.filters: Expose the initialization function
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function initialize(session) |
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local filters = {}; |
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session.filters = filters; |
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function session.filter(type, data) |
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local filter_list = filters[type]; |
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if filter_list then |
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for i = 1, #filter_list do |
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data = filter_list[i](data); |
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if data == nil then break; end |
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end |
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end |
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return data; |
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end |
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end |
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function add_filter(session, type, callback, priority) |
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if not session.filters then |
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initialize(session); |
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end |
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local filter_list = session.filters[type]; |
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if not filter_list then |
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filter_list = {}; |
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session.filters[type] = filter_list; |
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end |
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priority = priority or 0; |
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local i = 0; |
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repeat |
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i = i + 1; |
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until not filter_list[i] or filter_list[filter_list[i]] >= priority; |
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t_insert(filter_list, i, callback); |
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filter_list[callback] = priority; |
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end |
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function remove_filter(session, type, callback) |
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if not session.filters then return; end |
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local filter_list = session.filters[type]; |
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if filter_list and filter_list[callback] then |
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for i=1, #filter_list do |
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if filter_list[i] == callback then |
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t_remove(filter_list, i); |
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filter_list[callback] = nil; |
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return true; |
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end |
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end |
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end |
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end |
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return _M; |