Module: Im::ModuleConstAdded
- Defined in:
- lib/im/module_const_added.rb
Instance Method Summary collapse
-
#const_added(const_name) ⇒ Object
We patch Module#const_added to track every time a constant is added to a permanently-named module pointing to an Im-autoloaded constant.
Instance Method Details
#const_added(const_name) ⇒ Object
We patch Module#const_added to track every time a constant is added to a permanently-named module pointing to an Im-autoloaded constant. This is important because the moment that an Im-autoloaded constant is attached to a permanently named module, its name changes permanently. Although Im internally avoids the use of absolute cpaths, ExplicitNamespace must use them and thus we need to update its internal registry accordingly.
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# File 'lib/im/module_const_added.rb', line 15 def const_added(const_name) # If we are called from an autoload, no need to track. return super if autoload?(const_name) # Get the name of this module and only continue if it is a permanent name. return unless cpath = Im.permanent_cpath(self) # We know this is not an autoloaded constant, so it is safe to fetch the # value. We fetch the value, get it's object_id, and check the registry to # see if it is an Im-autoloaded module. relative_cpath, loader, references = Im::Registry.autoloaded_modules[const_get(const_name).object_id] return super unless loader # Update the context for this const add. This is important for reloading so # we can reset inbound references when the autoloaded module is unloaded. references << [self, const_name] # Update all absolute cpath references to this module by replacing all # references to the original cpath with the new, permanently-named cpath. # # For example, if we had a module loader::Foo::Bar, and loader::Foo was # assigned to Baz like this: # # Baz = loader::Foo # # then we must update cpaths from a string like # # "#<Im::Loader ...>::Foo::Bar" # # to # # "Baz::Bar" # # To do this, we take the loader's module_prefix ("#<Im::Loader ...>::"), # append to it the relative cpath of the constant ("Foo") and replace that by the new # name ("Baz"), roughly like this: # # "#<Im::Loader ...>::Foo::Bar".gsub(/^#{"#<Im::Loader ...>::Foo"}/, "Baz") # prefix = relative_cpath ? "#{loader.module_prefix}#{relative_cpath}" : loader.module_prefix.delete_suffix("::") ::Im::ExplicitNamespace.__update_cpaths(prefix, "#{cpath}::#{const_name}") super rescue NameError super end |