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1 --[[ $Id: CallbackHandler-1.0.lua 965 2010-08-09 00:47:52Z mikk $ ]]
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2 local MAJOR, MINOR = "CallbackHandler-1.0", 6
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3 local CallbackHandler = LibStub:NewLibrary(MAJOR, MINOR)
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4
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5 if not CallbackHandler then return end -- No upgrade needed
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6
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7 local meta = {__index = function(tbl, key) tbl[key] = {} return tbl[key] end}
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8
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9 -- Lua APIs
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10 local tconcat = table.concat
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11 local assert, error, loadstring = assert, error, loadstring
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12 local setmetatable, rawset, rawget = setmetatable, rawset, rawget
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13 local next, select, pairs, type, tostring = next, select, pairs, type, tostring
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14
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15 -- Global vars/functions that we don't upvalue since they might get hooked, or upgraded
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16 -- List them here for Mikk's FindGlobals script
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17 -- GLOBALS: geterrorhandler
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18
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19 local xpcall = xpcall
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20
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21 local function errorhandler(err)
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22 return geterrorhandler()(err)
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23 end
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24
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25 local function CreateDispatcher(argCount)
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26 local code = [[
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27 local next, xpcall, eh = ...
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28
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29 local method, ARGS
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30 local function call() method(ARGS) end
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31
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32 local function dispatch(handlers, ...)
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33 local index
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34 index, method = next(handlers)
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35 if not method then return end
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36 local OLD_ARGS = ARGS
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37 ARGS = ...
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38 repeat
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39 xpcall(call, eh)
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40 index, method = next(handlers, index)
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41 until not method
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42 ARGS = OLD_ARGS
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43 end
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44
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45 return dispatch
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46 ]]
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47
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48 local ARGS, OLD_ARGS = {}, {}
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49 for i = 1, argCount do ARGS[i], OLD_ARGS[i] = "arg"..i, "old_arg"..i end
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50 code = code:gsub("OLD_ARGS", tconcat(OLD_ARGS, ", ")):gsub("ARGS", tconcat(ARGS, ", "))
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51 return assert(loadstring(code, "safecall Dispatcher["..argCount.."]"))(next, xpcall, errorhandler)
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52 end
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53
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54 local Dispatchers = setmetatable({}, {__index=function(self, argCount)
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55 local dispatcher = CreateDispatcher(argCount)
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56 rawset(self, argCount, dispatcher)
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57 return dispatcher
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58 end})
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59
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60 --------------------------------------------------------------------------
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61 -- CallbackHandler:New
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62 --
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63 -- target - target object to embed public APIs in
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64 -- RegisterName - name of the callback registration API, default "RegisterCallback"
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65 -- UnregisterName - name of the callback unregistration API, default "UnregisterCallback"
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66 -- UnregisterAllName - name of the API to unregister all callbacks, default "UnregisterAllCallbacks". false == don't publish this API.
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67
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68 function CallbackHandler:New(target, RegisterName, UnregisterName, UnregisterAllName, OnUsed, OnUnused)
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69 -- TODO: Remove this after beta has gone out
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70 assert(not OnUsed and not OnUnused, "ACE-80: OnUsed/OnUnused are deprecated. Callbacks are now done to registry.OnUsed and registry.OnUnused")
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71
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72 RegisterName = RegisterName or "RegisterCallback"
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73 UnregisterName = UnregisterName or "UnregisterCallback"
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74 if UnregisterAllName==nil then -- false is used to indicate "don't want this method"
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75 UnregisterAllName = "UnregisterAllCallbacks"
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76 end
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77
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78 -- we declare all objects and exported APIs inside this closure to quickly gain access
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79 -- to e.g. function names, the "target" parameter, etc
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80
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81
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82 -- Create the registry object
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83 local events = setmetatable({}, meta)
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84 local registry = { recurse=0, events=events }
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85
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86 -- registry:Fire() - fires the given event/message into the registry
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87 function registry:Fire(eventname, ...)
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88 if not rawget(events, eventname) or not next(events[eventname]) then return end
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89 local oldrecurse = registry.recurse
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90 registry.recurse = oldrecurse + 1
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91
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92 Dispatchers[select('#', ...) + 1](events[eventname], eventname, ...)
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93
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94 registry.recurse = oldrecurse
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95
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96 if registry.insertQueue and oldrecurse==0 then
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97 -- Something in one of our callbacks wanted to register more callbacks; they got queued
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98 for eventname,callbacks in pairs(registry.insertQueue) do
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99 local first = not rawget(events, eventname) or not next(events[eventname]) -- test for empty before. not test for one member after. that one member may have been overwritten.
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100 for self,func in pairs(callbacks) do
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101 events[eventname][self] = func
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102 -- fire OnUsed callback?
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103 if first and registry.OnUsed then
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104 registry.OnUsed(registry, target, eventname)
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105 first = nil
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106 end
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107 end
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108 end
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109 registry.insertQueue = nil
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110 end
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111 end
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112
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113 -- Registration of a callback, handles:
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114 -- self["method"], leads to self["method"](self, ...)
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115 -- self with function ref, leads to functionref(...)
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116 -- "addonId" (instead of self) with function ref, leads to functionref(...)
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117 -- all with an optional arg, which, if present, gets passed as first argument (after self if present)
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118 target[RegisterName] = function(self, eventname, method, ... --[[actually just a single arg]])
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119 if type(eventname) ~= "string" then
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120 error("Usage: "..RegisterName.."(eventname, method[, arg]): 'eventname' - string expected.", 2)
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121 end
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122
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123 method = method or eventname
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124
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125 local first = not rawget(events, eventname) or not next(events[eventname]) -- test for empty before. not test for one member after. that one member may have been overwritten.
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126
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127 if type(method) ~= "string" and type(method) ~= "function" then
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128 error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - string or function expected.", 2)
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129 end
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130
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131 local regfunc
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132
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133 if type(method) == "string" then
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134 -- self["method"] calling style
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135 if type(self) ~= "table" then
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136 error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): self was not a table?", 2)
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137 elseif self==target then
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138 error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): do not use Library:"..RegisterName.."(), use your own 'self'", 2)
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139 elseif type(self[method]) ~= "function" then
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140 error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - method '"..tostring(method).."' not found on self.", 2)
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141 end
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142
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143 if select("#",...)>=1 then -- this is not the same as testing for arg==nil!
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144 local arg=select(1,...)
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145 regfunc = function(...) self[method](self,arg,...) end
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146 else
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147 regfunc = function(...) self[method](self,...) end
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148 end
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149 else
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150 -- function ref with self=object or self="addonId" or self=thread
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151 if type(self)~="table" and type(self)~="string" and type(self)~="thread" then
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152 error("Usage: "..RegisterName.."(self or \"addonId\", eventname, method): 'self or addonId': table or string or thread expected.", 2)
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153 end
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154
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155 if select("#",...)>=1 then -- this is not the same as testing for arg==nil!
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156 local arg=select(1,...)
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157 regfunc = function(...) method(arg,...) end
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158 else
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159 regfunc = method
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160 end
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161 end
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162
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163
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164 if events[eventname][self] or registry.recurse<1 then
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165 -- if registry.recurse<1 then
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166 -- we're overwriting an existing entry, or not currently recursing. just set it.
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167 events[eventname][self] = regfunc
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168 -- fire OnUsed callback?
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169 if registry.OnUsed and first then
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170 registry.OnUsed(registry, target, eventname)
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171 end
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172 else
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173 -- we're currently processing a callback in this registry, so delay the registration of this new entry!
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174 -- yes, we're a bit wasteful on garbage, but this is a fringe case, so we're picking low implementation overhead over garbage efficiency
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175 registry.insertQueue = registry.insertQueue or setmetatable({},meta)
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176 registry.insertQueue[eventname][self] = regfunc
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177 end
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178 end
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179
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180 -- Unregister a callback
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181 target[UnregisterName] = function(self, eventname)
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182 if not self or self==target then
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183 error("Usage: "..UnregisterName.."(eventname): bad 'self'", 2)
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184 end
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185 if type(eventname) ~= "string" then
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186 error("Usage: "..UnregisterName.."(eventname): 'eventname' - string expected.", 2)
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187 end
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188 if rawget(events, eventname) and events[eventname][self] then
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189 events[eventname][self] = nil
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190 -- Fire OnUnused callback?
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191 if registry.OnUnused and not next(events[eventname]) then
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192 registry.OnUnused(registry, target, eventname)
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193 end
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194 end
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195 if registry.insertQueue and rawget(registry.insertQueue, eventname) and registry.insertQueue[eventname][self] then
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196 registry.insertQueue[eventname][self] = nil
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197 end
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198 end
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199
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200 -- OPTIONAL: Unregister all callbacks for given selfs/addonIds
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201 if UnregisterAllName then
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202 target[UnregisterAllName] = function(...)
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203 if select("#",...)<1 then
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204 error("Usage: "..UnregisterAllName.."([whatFor]): missing 'self' or \"addonId\" to unregister events for.", 2)
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205 end
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206 if select("#",...)==1 and ...==target then
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207 error("Usage: "..UnregisterAllName.."([whatFor]): supply a meaningful 'self' or \"addonId\"", 2)
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208 end
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209
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210
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211 for i=1,select("#",...) do
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212 local self = select(i,...)
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213 if registry.insertQueue then
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214 for eventname, callbacks in pairs(registry.insertQueue) do
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215 if callbacks[self] then
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216 callbacks[self] = nil
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217 end
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218 end
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219 end
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220 for eventname, callbacks in pairs(events) do
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221 if callbacks[self] then
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222 callbacks[self] = nil
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223 -- Fire OnUnused callback?
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224 if registry.OnUnused and not next(callbacks) then
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225 registry.OnUnused(registry, target, eventname)
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226 end
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227 end
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228 end
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229 end
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230 end
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231 end
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232
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233 return registry
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234 end
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235
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236
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237 -- CallbackHandler purposefully does NOT do explicit embedding. Nor does it
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238 -- try to upgrade old implicit embeds since the system is selfcontained and
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239 -- relies on closures to work.
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240
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