How to determine correctly a lua function call

[avancinirodrigo]

I think that this problem is a recurrent problem to parse script language because it is not typed.

[avancinirodrigo]

Problem:
src/lua/doc.lua

   local mLayer_ = {
        fill = function(self, data) --<<< PROBLEM HERE
            local name = self.file or self.database
            if not name then return nil end

            if not layers[name] then
                layers[name] = {attributes = {}}
            end

            local description = "Operation "..data.operation

data/emas.lua

cl:fill{ --<<< PROBLEM HERE
    operation = "presence",
    attribute = "firebreak",
    layer = "firebreak"
}