golden hour

/opt/cpanel/perl5/536/site_lib/Perl/Critic/Policy/InputOutput

File/Folder	Size	Actions
ProhibitBacktickOperators.pm	4 KB
ProhibitBarewordDirHandles.pm	3.87 KB
ProhibitBarewordFileHandles.pm	3.81 KB
ProhibitExplicitStdin.pm	3.15 KB
ProhibitInteractiveTest.pm	1.97 KB
ProhibitJoinedReadline.pm	3.29 KB
ProhibitOneArgSelect.pm	2.48 KB
ProhibitReadlineInForLoop.pm	2.65 KB
ProhibitTwoArgOpen.pm	3.84 KB
RequireBracedFileHandleWithPrint.pm	4 KB
RequireBriefOpen.pm	11.27 KB
RequireCheckedClose.pm	3.24 KB
RequireCheckedOpen.pm	3.34 KB
RequireCheckedSyscalls.pm	6.93 KB
RequireEncodingWithUTF8Layer.pm	5.31 KB

Edit: ProhibitReadlineInForLoop.pm

package Perl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop;

use 5.010001;
use strict;
use warnings;
use Readonly;

use List::Util qw< first >;

use Perl::Critic::Utils qw{ :severities };
use parent 'Perl::Critic::Policy';

our $VERSION = '1.152';

#-----------------------------------------------------------------------------

Readonly::Scalar my $DESC => q{Readline inside "for" loop};
Readonly::Scalar my $EXPL => [ 211 ];

#-----------------------------------------------------------------------------

sub supported_parameters { return ()                             }
sub default_severity     { return $SEVERITY_HIGH                 }
sub default_themes       { return qw< core bugs pbp >            }
sub applies_to           { return qw< PPI::Statement::Compound > }

#-----------------------------------------------------------------------------

sub violates {
    my ( $self, $elem, undef ) = @_;

return if $elem->type() ne 'foreach';

my $list = first { $_->isa('PPI::Structure::List') } $elem->schildren()
        or return;

if (
        my $readline = $list->find_first('PPI::Token::QuoteLike::Readline')
    ) {
        return $self->violation( $DESC, $EXPL, $readline );
    }

return;  #ok!
}

__END__

#-----------------------------------------------------------------------------

=pod

=head1 NAME

Perl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop - Write C<< while( $line = <> ){...} >> instead of C<< for(<>){...} >>.

=head1 AFFILIATION

This Policy is part of the core L<Perl::Critic|Perl::Critic>
distribution.

=head1 DESCRIPTION

Using the readline operator in a C<for> or C<foreach> loop is very
slow.  The iteration list of the loop creates a list context, which
causes the readline operator to read the entire input stream before
iteration even starts.  Instead, just use a C<while> loop, which only
reads one line at a time.

for my $line ( <$file_handle> ){ do_something($line) }      #not ok
  while ( my $line = <$file_handle> ){ do_something($line) }  #ok

=head1 CONFIGURATION

This Policy is not configurable except for the standard options.

=head1 AUTHOR

Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

=head1 COPYRIGHT

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.

=cut

# Local Variables:
#   mode: cperl
#   cperl-indent-level: 4
#   fill-column: 78
#   indent-tabs-mode: nil
#   c-indentation-style: bsd
# End:
# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround :