240 lines
9 KiB
Lua
240 lines
9 KiB
Lua
--[[ $Id: CallbackHandler-1.0.lua 14 2010-08-09 00:43:38Z mikk $ ]]
|
|
local MAJOR, MINOR = "CallbackHandler-1.0", 6
|
|
local CallbackHandler = LibStub:NewLibrary(MAJOR, MINOR)
|
|
|
|
if not CallbackHandler then return end -- No upgrade needed
|
|
|
|
local meta = {__index = function(tbl, key) tbl[key] = {} return tbl[key] end}
|
|
|
|
-- Lua APIs
|
|
local tconcat = table.concat
|
|
local assert, error, loadstring = assert, error, loadstring
|
|
local setmetatable, rawset, rawget = setmetatable, rawset, rawget
|
|
local next, select, pairs, type, tostring = next, select, pairs, type, tostring
|
|
|
|
-- Global vars/functions that we don't upvalue since they might get hooked, or upgraded
|
|
-- List them here for Mikk's FindGlobals script
|
|
-- GLOBALS: geterrorhandler
|
|
|
|
local xpcall = xpcall
|
|
|
|
local function errorhandler(err)
|
|
return geterrorhandler()(err)
|
|
end
|
|
|
|
local function CreateDispatcher(argCount)
|
|
local code = [[
|
|
local next, xpcall, eh = ...
|
|
|
|
local method, ARGS
|
|
local function call() method(ARGS) end
|
|
|
|
local function dispatch(handlers, ...)
|
|
local index
|
|
index, method = next(handlers)
|
|
if not method then return end
|
|
local OLD_ARGS = ARGS
|
|
ARGS = ...
|
|
repeat
|
|
xpcall(call, eh)
|
|
index, method = next(handlers, index)
|
|
until not method
|
|
ARGS = OLD_ARGS
|
|
end
|
|
|
|
return dispatch
|
|
]]
|
|
|
|
local ARGS, OLD_ARGS = {}, {}
|
|
for i = 1, argCount do ARGS[i], OLD_ARGS[i] = "arg"..i, "old_arg"..i end
|
|
code = code:gsub("OLD_ARGS", tconcat(OLD_ARGS, ", ")):gsub("ARGS", tconcat(ARGS, ", "))
|
|
return assert(loadstring(code, "safecall Dispatcher["..argCount.."]"))(next, xpcall, errorhandler)
|
|
end
|
|
|
|
local Dispatchers = setmetatable({}, {__index=function(self, argCount)
|
|
local dispatcher = CreateDispatcher(argCount)
|
|
rawset(self, argCount, dispatcher)
|
|
return dispatcher
|
|
end})
|
|
|
|
--------------------------------------------------------------------------
|
|
-- CallbackHandler:New
|
|
--
|
|
-- target - target object to embed public APIs in
|
|
-- RegisterName - name of the callback registration API, default "RegisterCallback"
|
|
-- UnregisterName - name of the callback unregistration API, default "UnregisterCallback"
|
|
-- UnregisterAllName - name of the API to unregister all callbacks, default "UnregisterAllCallbacks". false == don't publish this API.
|
|
|
|
function CallbackHandler:New(target, RegisterName, UnregisterName, UnregisterAllName, OnUsed, OnUnused)
|
|
-- TODO: Remove this after beta has gone out
|
|
assert(not OnUsed and not OnUnused, "ACE-80: OnUsed/OnUnused are deprecated. Callbacks are now done to registry.OnUsed and registry.OnUnused")
|
|
|
|
RegisterName = RegisterName or "RegisterCallback"
|
|
UnregisterName = UnregisterName or "UnregisterCallback"
|
|
if UnregisterAllName==nil then -- false is used to indicate "don't want this method"
|
|
UnregisterAllName = "UnregisterAllCallbacks"
|
|
end
|
|
|
|
-- we declare all objects and exported APIs inside this closure to quickly gain access
|
|
-- to e.g. function names, the "target" parameter, etc
|
|
|
|
|
|
-- Create the registry object
|
|
local events = setmetatable({}, meta)
|
|
local registry = { recurse=0, events=events }
|
|
|
|
-- registry:Fire() - fires the given event/message into the registry
|
|
function registry:Fire(eventname, ...)
|
|
if not rawget(events, eventname) or not next(events[eventname]) then return end
|
|
local oldrecurse = registry.recurse
|
|
registry.recurse = oldrecurse + 1
|
|
|
|
Dispatchers[select('#', ...) + 1](events[eventname], eventname, ...)
|
|
|
|
registry.recurse = oldrecurse
|
|
|
|
if registry.insertQueue and oldrecurse==0 then
|
|
-- Something in one of our callbacks wanted to register more callbacks; they got queued
|
|
for eventname,callbacks in pairs(registry.insertQueue) do
|
|
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.
|
|
for self,func in pairs(callbacks) do
|
|
events[eventname][self] = func
|
|
-- fire OnUsed callback?
|
|
if first and registry.OnUsed then
|
|
registry.OnUsed(registry, target, eventname)
|
|
first = nil
|
|
end
|
|
end
|
|
end
|
|
registry.insertQueue = nil
|
|
end
|
|
end
|
|
|
|
-- Registration of a callback, handles:
|
|
-- self["method"], leads to self["method"](self, ...)
|
|
-- self with function ref, leads to functionref(...)
|
|
-- "addonId" (instead of self) with function ref, leads to functionref(...)
|
|
-- all with an optional arg, which, if present, gets passed as first argument (after self if present)
|
|
target[RegisterName] = function(self, eventname, method, ... --[[actually just a single arg]])
|
|
if type(eventname) ~= "string" then
|
|
error("Usage: "..RegisterName.."(eventname, method[, arg]): 'eventname' - string expected.", 2)
|
|
end
|
|
|
|
method = method or eventname
|
|
|
|
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.
|
|
|
|
if type(method) ~= "string" and type(method) ~= "function" then
|
|
error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - string or function expected.", 2)
|
|
end
|
|
|
|
local regfunc
|
|
|
|
if type(method) == "string" then
|
|
-- self["method"] calling style
|
|
if type(self) ~= "table" then
|
|
error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): self was not a table?", 2)
|
|
elseif self==target then
|
|
error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): do not use Library:"..RegisterName.."(), use your own 'self'", 2)
|
|
elseif type(self[method]) ~= "function" then
|
|
error("Usage: "..RegisterName.."(\"eventname\", \"methodname\"): 'methodname' - method '"..tostring(method).."' not found on self.", 2)
|
|
end
|
|
|
|
if select("#",...)>=1 then -- this is not the same as testing for arg==nil!
|
|
local arg=select(1,...)
|
|
regfunc = function(...) self[method](self,arg,...) end
|
|
else
|
|
regfunc = function(...) self[method](self,...) end
|
|
end
|
|
else
|
|
-- function ref with self=object or self="addonId" or self=thread
|
|
if type(self)~="table" and type(self)~="string" and type(self)~="thread" then
|
|
error("Usage: "..RegisterName.."(self or \"addonId\", eventname, method): 'self or addonId': table or string or thread expected.", 2)
|
|
end
|
|
|
|
if select("#",...)>=1 then -- this is not the same as testing for arg==nil!
|
|
local arg=select(1,...)
|
|
regfunc = function(...) method(arg,...) end
|
|
else
|
|
regfunc = method
|
|
end
|
|
end
|
|
|
|
|
|
if events[eventname][self] or registry.recurse<1 then
|
|
-- if registry.recurse<1 then
|
|
-- we're overwriting an existing entry, or not currently recursing. just set it.
|
|
events[eventname][self] = regfunc
|
|
-- fire OnUsed callback?
|
|
if registry.OnUsed and first then
|
|
registry.OnUsed(registry, target, eventname)
|
|
end
|
|
else
|
|
-- we're currently processing a callback in this registry, so delay the registration of this new entry!
|
|
-- yes, we're a bit wasteful on garbage, but this is a fringe case, so we're picking low implementation overhead over garbage efficiency
|
|
registry.insertQueue = registry.insertQueue or setmetatable({},meta)
|
|
registry.insertQueue[eventname][self] = regfunc
|
|
end
|
|
end
|
|
|
|
-- Unregister a callback
|
|
target[UnregisterName] = function(self, eventname)
|
|
if not self or self==target then
|
|
error("Usage: "..UnregisterName.."(eventname): bad 'self'", 2)
|
|
end
|
|
if type(eventname) ~= "string" then
|
|
error("Usage: "..UnregisterName.."(eventname): 'eventname' - string expected.", 2)
|
|
end
|
|
if rawget(events, eventname) and events[eventname][self] then
|
|
events[eventname][self] = nil
|
|
-- Fire OnUnused callback?
|
|
if registry.OnUnused and not next(events[eventname]) then
|
|
registry.OnUnused(registry, target, eventname)
|
|
end
|
|
end
|
|
if registry.insertQueue and rawget(registry.insertQueue, eventname) and registry.insertQueue[eventname][self] then
|
|
registry.insertQueue[eventname][self] = nil
|
|
end
|
|
end
|
|
|
|
-- OPTIONAL: Unregister all callbacks for given selfs/addonIds
|
|
if UnregisterAllName then
|
|
target[UnregisterAllName] = function(...)
|
|
if select("#",...)<1 then
|
|
error("Usage: "..UnregisterAllName.."([whatFor]): missing 'self' or \"addonId\" to unregister events for.", 2)
|
|
end
|
|
if select("#",...)==1 and ...==target then
|
|
error("Usage: "..UnregisterAllName.."([whatFor]): supply a meaningful 'self' or \"addonId\"", 2)
|
|
end
|
|
|
|
|
|
for i=1,select("#",...) do
|
|
local self = select(i,...)
|
|
if registry.insertQueue then
|
|
for eventname, callbacks in pairs(registry.insertQueue) do
|
|
if callbacks[self] then
|
|
callbacks[self] = nil
|
|
end
|
|
end
|
|
end
|
|
for eventname, callbacks in pairs(events) do
|
|
if callbacks[self] then
|
|
callbacks[self] = nil
|
|
-- Fire OnUnused callback?
|
|
if registry.OnUnused and not next(callbacks) then
|
|
registry.OnUnused(registry, target, eventname)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
return registry
|
|
end
|
|
|
|
|
|
-- CallbackHandler purposefully does NOT do explicit embedding. Nor does it
|
|
-- try to upgrade old implicit embeds since the system is selfcontained and
|
|
-- relies on closures to work.
|
|
|