cperl mode comments still parsed and colored

cperl mode comments still parsed and colored

[jidanni]

#-*-cperl-*-
# Notice how the ]{2} is in a different color than comment color. This ]{2} too.

Re: cperl mode comments still parsed and colored

[jidanni]

bla /m #-*-cperl-*-
#h /Delivery
# \@m

#Save this message body into a file bla.pl and do emacs -Q bla.pl, to
#see more of my discoveries which I hereby report as bugs. Real
#comment color is [this color]. Above you can see I have tricked cperl
#mode into making things in comments render in non comment colors.
#Syntax errors or not, like \@m.

Re: cperl mode comments still parsed and colored

[jidanni]

P.S., my delicate bug will be mangled if reading
http://article.gmane.org/gmane.emacs.devel/76734 .
http://article.gmane.org/gmane.emacs.devel/76734/raw
is what I actually wrote.

Re: cperl mode comments still parsed and colored

[Randal L. Schwartz]

>>>>> "jidanni" == jidanni  <jidanni@jidanni.org> writes:

jidanni> bla /m #-*-cperl-*-
jidanni> #h /Delivery
jidanni> # \@m

jidanni> #Save this message body into a file bla.pl and do emacs -Q bla.pl, to
jidanni> #see more of my discoveries which I hereby report as bugs. Real
jidanni> #comment color is [this color]. Above you can see I have tricked cperl
jidanni> #mode into making things in comments render in non comment colors.
jidanni> #Syntax errors or not, like \@m.

You've got gibberish there.  I could see Perl trying to parse that as

  bla (function, taking arguments...)
  / (begin of regex)
  m #-*-cperl-*- (content of regex)

so it's not a comment yet.

If you can show a reasonable Perl program that breaks, it'd be much
more interesting.  Gibberish in, Gibberish out.

It's like you'd claim that:

q{   # this is a comment

when in fact it's not a comment.  It's part of a single-quoted string.
Don't be naive about Perl if you're going to report bugs in cperl-mode.

-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!

Re: cperl mode comments still parsed and colored

[jidanni]

RLS> You've got gibberish there.
OK, but you must admit that lines 2 and 3 of this have non-comment
colors inside comments:
#-*-cperl-*-
#  ]{2} ]{2} too.
#\@m

Re: cperl mode comments still parsed and colored

[Randal L. Schwartz]

>>>>> "jidanni" == jidanni  <jidanni@jidanni.org> writes:

RLS> You've got gibberish there.
jidanni> OK, but you must admit that lines 2 and 3 of this have non-comment
jidanni> colors inside comments:
jidanni> #-*-cperl-*-
jidanni> #  ]{2} ]{2} too.
jidanni> #\@m

And again, not typical Perl code.

That's because cperl-mode doesn't promise to be perfect. It actually *can't
be*: see my summary of why *no* parser can parse Perl without executing Perl
at <http://www.perlmonks.org/index.pl?node_id=44722>.  Perl cannot be
statically lexed.  That's incontrovertible.

We've all learned to allow cperl-mode to color Perl "mostly ok", knowing it
can be tricked by very atypical Perl code, including gibberish.  Your stuff is
still very atypical character sequences.  Stop doing that.  Show us a useful
Perl program that doesn't get colored right, and I'm sure Ilya will be happy
to take a stab at compromising cperl-mode a bit more to make it work again.
And even then, most of us have also learned to "give cperl-mode a bone"
occasionally to keep it happy.  It's definitely a lot better than perl-mode,
which required some serious contortions to get right, and why no serious Perl
hacker uses perl-mode any more, and why we're happy Ilya crafted cperl-mode to
get it "mostly right".  Ilya wrote half of the regular expression engine and
half the Perl debugger as well, so he's intimately familiar with trying
to wrangle text engines to do the right thing.

-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
Perl/Unix/security consulting, Technical writing, Comedy, etc. etc.
See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!

Re: cperl mode comments still parsed and colored

[Stefan Monnier]

> occasionally to keep it happy.  It's definitely a lot better than perl-mode,
> which required some serious contortions to get right,

For what it's worth perl-mode now does a better job of it.
Obviously I use perl-mode.

> and why no serious Perl hacker uses perl-mode any more,

And indeed, I'm no Perl hacker ;-)

> and why we're happy Ilya crafted cperl-mode to

Yes, it was a significant improvement.  But I must say it had too many
idiosyncrasies for my taste, which is why I preferred to improve perl-mode
than to use cperl-mode.  perl-mode still lacks some things from cperl-mode,
of course.


        Stefan