Use raw access again, less false catches

Author: alerque

fluent/_nodes.lua

@@ -17,7 +17,7 @@ FluentNode._name = "FluentNode"
 
 function FluentNode:_init (ast, resource)
   if self._name == "MessageReference" or self._name == "TermReference" then
-    getmetatable(self)._resource = resource
+    rawset(getmetatable(self), "_resource", resource)
   end
   for key, value in pairs(ast) do
     if type(key) == "string" then
@@ -295,7 +295,7 @@ FTL.MessageReference = class(FluentNode)
 FTL.MessageReference._name = "MessageReference"
 
 function FTL.MessageReference:format (parameters)
-  return getmetatable(self)._resource:get_message(self.id.name):format(parameters)
+  return rawget(getmetatable(self), "_resource"):get_message(self.id.name):format(parameters)
 end
 
 FTL.TermReference = class(FluentNode)
@@ -314,7 +314,7 @@ function FTL.TermReference:__mul (node)
 end
 
 function FTL.TermReference:format (parameters)
-  return getmetatable(self)._resource:get_term(self.id.name):format(parameters)
+  return rawget(getmetatable(self), "_resource"):get_term(self.id.name):format(parameters)
 end
 
 FTL._TermReference = FTL.TermReference

fluent/resource.lua

@@ -88,7 +88,7 @@ end
 function FluentResource:__add (other)
   if not self:is_a(other:is_a()) then error("Cannot merge unlike types") end
   for _, node in ipairs(other.body) do
-    if node._resource then node._resource = self end
+    if rawget(node, "_resource") then rawset(node, "_resource", self) end
     self:load_node(node)
   end
   return self