Module:log set and get

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The following documentation is located at Module:log set and get/documentation. ^[edit]

Useful links: subpage list • links • transclusions • testcases • sandbox

Creates a new version of a table that prints setting (__newindex) and getting (__index) operations to the log, that is table[key] = value and value = table[key]. This can help you identify why a value in your table has vanished or appeared. May not work if the table already has a metatable.

-- unique keys
local inner_key = function() end
local name_key = function() end

local function write_key(self, k)
	return (rawget(self, name_key) or "") .. "[" .. tostring(k) .. "]"
end

local mt = {
	__newindex = function(self, k, v)
		mw.logObject(v, "setting " .. write_key(self, k))
		rawset(rawget(self, inner_key), k, v)
	end,
	__index = function(self, k)
		local v = rawget(rawget(self, inner_key), k)
		mw.logObject(v, "getting " .. write_key(self, k))
		return v
	end,
	__pairs = function(self)
		return pairs(self[inner_key])
	end,
	__ipairs = function(self)
		return ipairs(self[inner_key])
	end,
}

return function(t, name)
	return setmetatable({ [inner_key] = t, [name_key] = name }, mt)
end