IronRuby and Me

Ruby IronRuby
1

Hello again (sorry for the double post),

We’ve noticed some slightly odd behavior. IronRuby, it seems, won’t
mangle methods that have the word “Me” in them, so if I have a method:

UncheckMeAndMyChildren, uncheck_me_and_my_children won’t work

but for:

UncheckSelfAndMyChildren, uncheck_self_and_my_children DOES work.

Is this a bug or the expected behavior?

Thanks,
Martin

2

Looks like a bug.

Tomas

3

Martin,

Expected, but also a bug. IronRuby will not provide a mangled name if
the method name contains a 2-letter-word that is not in this list:

as
by
do
id
it
if
in
is
go
my
of
ok
on
to
up

This list is pretty arbitrary … so “me” can probably be added to it.
FYI, the code is in
Merlin\Main\Languages\Ruby\Ruby\Runtime\RubyUtils.cs#TryMangleName
(approx. line 298).

~Jimmy

4

Thanks guys. Appreciate the (detailed) response.

Actually, this explains quite a bit. I’ve run into times sporadically
where i’d be using the mangled name and it wouldn’t be recognized and
had no ready explanation for it.

Is there a specific reason that two letter words arent mangled? (I
was looking in the comments of RubyUtils.cs but didn’t find anything
:stuck_out_tongue: ).

Thanks,
Martin

On Tue, Nov 10, 2009 at 5:45 PM, Jimmy S.

5

Gotcha… Thanks. I guess i’ve run into this myself with the
occasionally mangled name some_h_t_m_l, but that makes perfect sense.

Thanks,
Martin

On Tue, Nov 10, 2009 at 7:00 PM, Tomas M.

6

FYI: The special cases are listed in unit tests
(IronRuby.Tests\Runtime\RubyUtilsTests.cs). So you can look there if you
are not sure if the behavior is intended or not.

Tomas

7

Yes, the reason is that .NET naming guidelines says that two-letter
abbreviations are not camel-cased. That means we have names like
GetIPAddress, PI, GetILGenerator etc. These are mangled to
get_ip_address, pi, get_il_generator (not get_i_p_address, p_i, or
get_i_l_generator). Unmangling is inverse of mangling (name ==
unmangle(mangle(name))), thus unmangling cannot turn “ip” into “Ip”.

Name-mangling is only heuristics. If some name doesn’t follow the
guidelines or is ambiguous (let’s say “IT” in ITManager vs. “It” in
ItJustWorks) then you need to use regular name.

Tomas