Namespaces, inverted

ruby-talk
1

Lähettäjä: E S <eero.saynatkari@kolumbus.fi>
> Lähettäjä: Joel VanderWerf <vjoel@PATH.Berkeley.EDU>
> import libfile.as(Extern)
> # This fails because the library complex.rb tries to open an existing
> # class, Numeric, and modify its contents. But instead it opens a new
> # module, also called Numeric, that lives inside the wrapper. You can
> # fix this in complex.rb (assuming you want to touch 3rd party code)
> # by referring to the module as ::Numeric when you define it. But
> # there's still a problem...

Here I am modifying String and I didn't think of anyone
doing the same :slight_smile:

A solution would be to modify the loaded file String
before eval()ing it: do a

... =~ /(?:module|class\s(\w+?)/
if $ALL_STANDARD_MODULE_AND_CLASS_NAMES.has_key? $1
   # Escape the module name with ::
end

This (obviously) only works for standard modules and
classes and it doesn't take into account top-level
functions... (have to do def Kernel.foo explicitly if
necessary -any use of that function inside the imported
module would be sort of 'global' since it's in the same
scope anyway) but I'm not sure if it'd be necessary to
take precautions against anything else?

Alternatively, of course, the parser could look for
module/class declarations that are *not* standard
(e.g. 'module MyMod').

This, as the above example, still leaves the problem
of nested classes/modules, which would have to be
parsed for with some sort of a state machine. But
it really is too complex to implement in anything
but low-level C internally, where some shortcuts can
be taken.

E