From f5358335353e48e96706dbbf4936b24eca0a3176 Mon Sep 17 00:00:00 2001 From: Robin Date: Wed, 13 Jan 2021 13:16:15 +0100 Subject: [PATCH] Revision 1246 --- CallbackHandler-1.0.lua | 212 ++++++++++++++++++++++++++++++++++++++++ CallbackHandler-1.0.xml | 4 + LICENSE.txt | 29 ++++++ README.md | 1 + rev.txt | 1 + 5 files changed, 247 insertions(+) create mode 100644 CallbackHandler-1.0.lua create mode 100644 CallbackHandler-1.0.xml create mode 100644 LICENSE.txt create mode 100644 README.md create mode 100644 rev.txt diff --git a/CallbackHandler-1.0.lua b/CallbackHandler-1.0.lua new file mode 100644 index 0000000..a8377fe --- /dev/null +++ b/CallbackHandler-1.0.lua @@ -0,0 +1,212 @@ +--[[ $Id: CallbackHandler-1.0.lua 1186 2018-07-21 14:19:18Z nevcairiel $ ]] +local MAJOR, MINOR = "CallbackHandler-1.0", 7 +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 Dispatch(handlers, ...) + local index, method = next(handlers) + if not method then return end + repeat + xpcall(method, errorhandler, ...) + index, method = next(handlers, index) + until not method +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) + + 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 + + Dispatch(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. + diff --git a/CallbackHandler-1.0.xml b/CallbackHandler-1.0.xml new file mode 100644 index 0000000..876df83 --- /dev/null +++ b/CallbackHandler-1.0.xml @@ -0,0 +1,4 @@ + +