Module:fun/isCallable - Revision history

Sware: 1 revision imported

2026-04-21T11:22:37Z

1 revision imported

← Older revision	Revision as of 11:22, 21 April 2026
(No difference)

Sware: Created page with "local table_get_metamethod_module = "Module:table/getMetamethod" local require = require local type = type local function get_metamethod(...) get_metamethod = require(table_get_metamethod_module) return get_metamethod(...) end --[==[ Return {true} if the input is a function or functor (an object which can be called like a function, because it has a {call} metamethod). Note: if the input is an object with a {call} metamethod, but this function is not able to fin..."

2025-06-28T09:15:19Z

Created page with "local table_get_metamethod_module = "Module:table/getMetamethod" local require = require local type = type local function get_metamethod(...) get_metamethod = require(table_get_metamethod_module) return get_metamethod(...) end --[==[ Return {true} if the input is a function or functor (an object which can be called like a function, because it has a {__call} metamethod). Note: if the input is an object with a {__call} metamethod, but this function is not able to fin..."

← Older revision		Revision as of 09:15, 28 June 2025
Line 1:		Line 1:
	~~local debug_track_module = "Module:debug/track"~~
	local table_get_metamethod_module = "Module:table/getMetamethod"		local table_get_metamethod_module = "Module:table/getMetamethod"

	local require = require		local require = require
	local type = type		local type = type

	~~local function debug_track(...)~~
	~~debug_track = require(debug_track_module)~~
	~~return debug_track(...)~~
	~~end~~

	local function get_metamethod(...)		local function get_metamethod(...)
Line 34:		Line 28:
	-- `obj` is callable without actually calling it.		-- `obj` is callable without actually calling it.
	elseif not success then		elseif not success then
	~~debug_track("fun/isCallable/protected metatable")~~
	if allow_maybe then		if allow_maybe then
	return nil		return nil

wikt>Theknightwho: Protected "Module:fun/isCallable": Highly visible template/module ([Edit=Allow only template editors and administrators] (indefinite) [Move=Allow only template editors and administrators] (indefinite))

2025-05-09T20:36:42Z

Protected "Module:fun/isCallable": Highly visible template/module ([Edit=Allow only template editors and administrators] (indefinite) [Move=Allow only template editors and administrators] (indefinite))

New page

local debug_track_module = "Module:debug/track"
local table_get_metamethod_module = "Module:table/getMetamethod"

local require = require
local type = type

local function debug_track(...)
debug_track = require(debug_track_module)
return debug_track(...)
end

local function get_metamethod(...)
get_metamethod = require(table_get_metamethod_module)
return get_metamethod(...)
end

--[==[
Return {true} if the input is a function or functor (an object which can be called like a function, because it has a {__call} metamethod).

Note: if the input is an object with a {__call} metamethod, but this function is not able to find it because the object's metatable is protected with {__metatable}, then it will return {false} by default, or {nil} if the {allow_maybe} flag is set.]==]
return function(obj, allow_maybe)
if type(obj) == "function" then
return true
end
-- An object is callable if it has a __call metamethod, so try to get it
-- with get_metamethod().
local success, __call = get_metamethod(obj, "__call")
-- If this succeeds, `obj` will only be callable if the __call metamethod is
-- a function (i.e. it can't itself be a callable table), so don't recurse
-- to check it.
if __call and type(__call) == "function" then
return true
-- If not, then the metatable is protected, so it's not possible to know if
-- `obj` is callable without actually calling it.
elseif not success then
debug_track("fun/isCallable/protected metatable")
if allow_maybe then
return nil
end
end
return false
end