Bug #123495 for Parse-RecDescent: Autostub and Matchrule

Fri Nov 03 01:51:27 2017 PUGLET [...] cpan.org - Ticket created

CC:	greg [...] foletta.org
Subject:	Autostub and Matchrule

Hi, I've tried to search for information before posting this, but couldn't find any. It appears that if I'm using a matchrule in conjunction with autostubbing, the dynamic matchrule doesn't get autostubbed? Here's an example of what I'm doing: my $parser = new Parse::RecDescent(q{ <autostub> startrule: config_line(s) { $item{'config_line(s)'} } | unrecognised { $item{unrecognised} } config_line: <rulevar: local $type_re = defined $arg[0] ? qr{$arg[0]} : qr{[-\w]+}> config_line: 'set' m{$type_re} <matchrule:$item{__PATTERN1__}> config_line[ $item{__PATTERN1__} ](s?) ... }); If I run this with the input 'set blah blah', I get the error: Unknown starting rule (Parse::RecDescent::namespace000001::blah) called Is this known or expected behaviour?

Fri Nov 03 13:12:32 2017 jtbraun [...] CPAN.org - Correspondence added

I'd have to go look more closely, but I suspect that <autostub> only generates stubs during grammar parsing. For your example to work, the <matchrule> directive would have to re-generate the parser (or at least the stub rule) if it doesn't exist in the current parser namespace. I wouldn't be surprised if that weren't covered. I'd have to look if the matchrule logic is generated in the parser, or if it's part of the runtime. If the former, it would certainly be possible to change the generated code if <autostub> is in effect to add this behavior. If the latter, doing rule existence checks will slow down all matchrule use, as you'll always have to do the check, or condition it on <autostub> having been present at parsing time. On Fri Nov 03 01:51:27 2017, PUGLET wrote: Show quoted text

> Hi, > > I've tried to search for information before posting this, but couldn't > find any. > > It appears that if I'm using a matchrule in conjunction with > autostubbing, the dynamic matchrule doesn't get autostubbed? > > Here's an example of what I'm doing: > > my $parser = new Parse::RecDescent(q{ > <autostub> > startrule: > config_line(s) { $item{'config_line(s)'} } | > unrecognised { $item{unrecognised} } > > config_line: <rulevar: local $type_re = defined $arg[0] ? qr{$arg[0]} > : qr{[-\w]+}> > config_line: 'set' m{$type_re} <matchrule:$item{__PATTERN1__}> > config_line[ $item{__PATTERN1__} ](s?) > > ... > }); > > If I run this with the input 'set blah blah', I get the error: > > Unknown starting rule (Parse::RecDescent::namespace000001::blah) > called > > Is this known or expected behaviour?

Fri Nov 03 13:12:33 2017 The RT System itself - Status changed from 'new' to 'open'