perl::critic::policy::inputoutput::prohibitjoinedreadline(3) [centos man page]

Perl::Critic::Policy::InputOutput::ProhibitJoinedReadlinUser Contributed Perl DocumentPerl::Critic::Policy::InputOutput::ProhibitJoinedReadline(3)

NAME

       Perl::Critic::Policy::InputOutput::ProhibitJoinedReadline - Use "local $/ = undef" or File::Slurp instead of joined readline.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       It's really easy to slurp a whole filehandle in at once with "join q{}, <$fh">, but that's inefficient -- Perl goes to the trouble of
       splitting the file into lines only to have that work thrown away.

       To save performance, either slurp the filehandle without splitting like so:

	 do { local $/ = undef; <$fh> }

       or use File::Slurp, which is even faster.

       Note that if the "ProhibitPunctuationVars" policy is also in effect, it will complain about the use of $/ in the line above.  In that case,
       write this instead:

	 use English '-no_match_vars';

	 do { local $INPUT_RECORD_SEPARATOR = undef; <$fh> };

CONFIGURATION

       This Policy is not configurable except for the standard options.

CAVEATS

       Due to a bug in the current version of PPI (v1.119_03) and earlier, the readline operator is often misinterpreted as less-than and greater-
       than operators after a comma.  Therefore, this policy only works well on the empty filehandle, "<>".  When PPI is fixed, this should just
       start working.

CREDITS

       Initial development of this policy was supported by a grant from the Perl Foundation.

AUTHOR

       Chris Dolan <cdolan@cpan.org>

COPYRIGHT

       Copyright (c) 2007-2011 Chris Dolan.  Many rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module

perl v5.16.3							    2014-06-09	      Perl::Critic::Policy::InputOutput::ProhibitJoinedReadline(3)

Perl::Critic::Policy::InputOutput::ProhibitExplicitStdinUser)Contributed Perl DocumenPerl::Critic::Policy::InputOutput::ProhibitExplicitStdin(3pm)

NAME

       Perl::Critic::Policy::InputOutput::ProhibitExplicitStdin - Use "<>" or "<ARGV>" or a prompting module instead of "<STDIN>".

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Perl has a useful magic filehandle called *ARGV that checks the command line and if there are any arguments, opens and reads those as
       files.  If there are no arguments, *ARGV behaves like *STDIN instead.  This behavior is almost always what you want if you want to create a
       program that reads from "STDIN".  This is often written in one of the following two equivalent forms:

	 while (<ARGV>) {
	   # ... do something with each input line ...
	 }
	 # or, equivalently:
	 while (<>) {
	   # ... do something with each input line ...
	 }

       If you want to prompt for user input, try special purpose modules like IO::Prompt.

CONFIGURATION

       This Policy is not configurable except for the standard options.

CAVEATS

       Due to a bug in the current version of PPI (v1.119_03) and earlier, the readline operator is often misinterpreted as less-than and greater-
       than operators after a comma.  Therefore, this policy misses important cases like

	 my $content = join '', <STDIN>;

       because it interprets that line as the nonsensical statement:

	 my $content = join '', < STDIN >;

       When that PPI bug is fixed, this policy should start catching those violations automatically.

CREDITS

       Initial development of this policy was supported by a grant from the Perl Foundation.

AUTHOR

       Chris Dolan <cdolan@cpan.org>

COPYRIGHT

       Copyright (c) 2007-2011 Chris Dolan.  Many rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module

perl v5.14.2							    2012-06-07	     Perl::Critic::Policy::InputOutput::ProhibitExplicitStdin(3pm)