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1 | -- Prosody IM |
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2 | -- Copyright (C) 2008-2010 Matthew Wild |
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3 | -- Copyright (C) 2008-2010 Waqas Hussain |
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4 | -- |
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5 | -- This project is MIT/X11 licensed. Please see the |
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6 | -- COPYING file in the source package for more information. |
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7 | -- |
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8 | |
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9 | |
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10 | local pairs = pairs; |
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11 | local t_insert = table.insert; |
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12 | local t_sort = table.sort; |
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13 | local setmetatable = setmetatable; |
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14 | local next = next; |
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15 | |
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16 | module "events" |
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17 | |
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18 | function new() |
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19 | local handlers = {}; |
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20 | local event_map = {}; |
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21 | local function _rebuild_index(handlers, event) |
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22 | local _handlers = event_map[event]; |
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23 | if not _handlers or next(_handlers) == nil then return; end |
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24 | local index = {}; |
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25 | for handler in pairs(_handlers) do |
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26 | t_insert(index, handler); |
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27 | end |
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28 | t_sort(index, function(a, b) return _handlers[a] > _handlers[b]; end); |
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29 | handlers[event] = index; |
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30 | return index; |
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31 | end; |
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32 | setmetatable(handlers, { __index = _rebuild_index }); |
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33 | local function add_handler(event, handler, priority) |
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34 | local map = event_map[event]; |
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35 | if map then |
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36 | map[handler] = priority or 0; |
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37 | else |
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38 | map = {[handler] = priority or 0}; |
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39 | event_map[event] = map; |
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40 | end |
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41 | handlers[event] = nil; |
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42 | end; |
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43 | local function remove_handler(event, handler) |
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44 | local map = event_map[event]; |
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45 | if map then |
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46 | map[handler] = nil; |
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47 | handlers[event] = nil; |
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48 | end |
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49 | end; |
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50 | local function add_handlers(handlers) |
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51 | for event, handler in pairs(handlers) do |
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52 | add_handler(event, handler); |
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53 | end |
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54 | end; |
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55 | local function remove_handlers(handlers) |
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56 | for event, handler in pairs(handlers) do |
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57 | remove_handler(event, handler); |
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58 | end |
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59 | end; |
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60 | local function fire_event(event, ...) |
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61 | local h = handlers[event]; |
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62 | if h then |
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63 | for i=1,#h do |
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64 | local ret = h[i](...); |
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65 | if ret ~= nil then return ret; end |
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66 | end |
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67 | end |
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68 | end; |
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69 | return { |
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70 | add_handler = add_handler; |
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71 | remove_handler = remove_handler; |
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72 | add_handlers = add_handlers; |
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73 | remove_handlers = remove_handlers; |
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74 | fire_event = fire_event; |
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75 | _handlers = handlers; |
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76 | _event_map = event_map; |
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77 | }; |
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78 | end |
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79 | |
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80 | return _M; |