[perl #130010] v5.25.5-184-ga5540cf breaks texinfo

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[perl #130010] v5.25.5-184-ga5540cf breaks texinfo

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From:

James E Keenan via RT

Date:

November 7, 2016 16:29

Subject:

[perl #130010] v5.25.5-184-ga5540cf breaks texinfo

Message ID:

rt-4.0.24-21686-1478536180-1629.130010-15-0@perl.org

On Mon, 07 Nov 2016 13:47:55 GMT, jkeenan wrote:
> 
> The question is:  What is it about this the pattern:
> 
> #####
> /([^\S\x{202f}\x{00a0}]+)|(\p{InFullwidth})|((?:[^\s\p{InFullwidth}]|[\x{202f}\x{00a0}])+)/
> #####
> 
> ... that (a) as of commit C<a5540cf> but not previously; and (b) in
> the context of this test suite but not in isolation, perceives
> something to be a read-only value not subject to modification?

My next brainstorm:  Add "use re 'debug';" to sub add_text() in tp/Texinfo/Convert/ParagraphNonXS.pm.

When I did so and ran the debugging program found in one of my previous attachments, I got this output:

#####
Texinfo::Convert::ParagraphNonXS::add_text(../../tp/Texinfo/Convert/ParagraphNonXS.pm:329):
329:	  my @segments = split
330:	/([^\S\x{202f}\x{00a0}]+)|(\p{InFullwidth})|((?:[^\s\p{InFullwidth}]|[\x{202f}\x{00a0}])+)/,
331:	    $text;
  DB<6> n
Matching REx "([^\S\x{202f}\x{00a0}]+)|(\p{InFullwidth})|((?:[^\s\p{InFull"... against "This is "
   0 <> <This is >           |   0| 1:BRANCH(18)
   0 <> <This is >           |   1|  2:OPEN1(4)
   0 <> <This is >           |   1|  4:PLUS(16)
                             |   1|  ANYOF[\t\n\x0B\f\r \x85][1680 2000-200A 2028-2029 205F 3000] can match 0 times out of 2147483647...
                             |   1|  failed...
   0 <> <This is >           |   0| 18:BRANCH(34)
   0 <> <This is >           |   1|  19:OPEN2(21)
   0 <> <This is >           |   1|  21:ANYOF[+utf8::Texinfo::Convert::ParagraphNonXS::InFullwidth](32)
                             |   1|  failed...
   0 <> <This is >           |   0| 34:BRANCH(68)
   0 <> <This is >           |   1|  35:OPEN3(37)
   0 <> <This is >           |   1|  37:CURLYM[0]{1,INFTY}(66)
   0 <> <This is >           |   2|   39:BRANCH(51)
   0 <> <This is >           |   3|    40:ANYOF[^\t\n\x0B\f\r \x85\xA0{+utf8::Texinfo::Convert::ParagraphNonXS::InFullwidth}1680 2000-200A 2028-2029 202F 205F 3000](64)
Modification of a read-only value attempted at ../../tp/Texinfo/Convert/ParagraphNonXS.pm line 329.
 at ../../tp/Texinfo/Convert/ParagraphNonXS.pm line 329.
	Texinfo::Convert::ParagraphNonXS::add_text(Texinfo::Convert::ParagraphNonXS=HASH(0x35ba938), "This is ") called at ../../tp/Texinfo/Convert/Info.pm line 308
	Texinfo::Convert::Info::_info_header(Texinfo::Convert::Info=HASH(0x35b3038)) called at ../../tp/Texinfo/Convert/Info.pm line 81
	Texinfo::Convert::Info::output(Texinfo::Convert::Info=HASH(0x35b3038), HASH(0x35ab7c0)) called at ../texi2any.pl line 1348
panic: POPSTACK
Debugged program terminated.
#####

Since I have never previously used the regex debugger, I have no idea if there are any clues to a solution in that output.

Thoughts?

Thank you very much.

-- 
James E Keenan (jkeenan@cpan.org)

---
via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=130010

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