Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
Perl::CriticPerl::CritUserPContributedePerlEDocumentationrohibitEmptyCommas(3)

NAME
       Perl::Critic::Policy::ValuesAndExpressions::ProhibitEmptyCommas -
       disallow	empty consecutive commas

DESCRIPTION
       This policy is part of the "Perl::Critic::Pulp" add-on.	It prohibits
       empty comma operators "," or "=>" meaning either	consecutive commas or
       a comma at the start of a list or expression.

	   print 'foo',,'bar';	    # bad
	   @a =	(,1,2);		    # bad
	   foo (x, => 123);	    # bad
	   a =>=> 456;		    # bad
	   for (; $i++<10; $i++,,)  # bad
	   func	(,)		    # bad

       Extra commas like this are harmless and simply collapse out when	the
       program runs (see "List value constructors" in perldata), so this
       policy is only under the	"cosmetic" theme (see "POLICY THEMES" in
       Perl::Critic).  Usually this sort of thing is just a stray, or leftover
       from cut	and paste, or perhaps some over-enthusiastic column layout.
       Occasionally it can be something	more dubious,

	   # did you mean 1..6 range operator?
	   @a =	(1,,6);	       # bad

	   # this is two args, did you want three?
	   foo (1, , 2);       # bad

	   # this is three args, probably you forgot a value
	   bar (abc => ,       # bad
		def => 20);

       A comma at the end of a list or call is allowed.	 That's	quite usual
       and can be a good thing when cutting and	pasting	lines (see
       "RequireTrailingCommas" to mandate them!).

	   @b =	("foo",
		 "bar",	 # ok
		);

       If you use multiple commas in some systematic way for code layout you
       can always disable "ProhibitEmptyCommas"	from your .perlcriticrc	file
       in the usual way	(see "CONFIGURATION" in	Perl::Critic),

	   [-ValuesAndExpressions::ProhibitEmptyCommas]

SEE ALSO
       Perl::Critic::Pulp, Perl::Critic,
       Perl::Critic::Policy::CodeLayout::RequireTrailingCommas,
       Perl::Critic::Policy::ValuesAndExpressions::ProhibitCommaSeparatedStatements,
       Perl::Critic::Policy::Tics::ProhibitManyArrows

HOME PAGE
       http://user42.tuxfamily.org/perl-critic-pulp/index.html

COPYRIGHT
       Copyright 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
       Kevin Ryde

       Perl-Critic-Pulp	is free	software; you can redistribute it and/or
       modify it under the terms of the	GNU General Public License as
       published by the	Free Software Foundation; either version 3, or (at
       your option) any	later version.

       Perl-Critic-Pulp	is distributed in the hope that	it will	be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A	PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.

       You should have received	a copy of the GNU General Public License along
       with Perl-Critic-Pulp.  If not, see <http://www.gnu.org/licenses/>.

perl v5.24.1Perl::Critic::Policy::ValuesAndExpressions::ProhibitEmptyCommas(3)

NAME | DESCRIPTION | SEE ALSO | HOME PAGE | COPYRIGHT

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=Perl::Critic::Policy::ValuesAndExpressions::ProhibitEmptyCommas&sektion=3&manpath=FreeBSD+12.1-RELEASE+and+Ports>

home | help