Perl::Critic::PoliPerl::Critic::Policy::InputOutput::ProhibitJoinedReadline(3)NAMEPerl::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 v5.14.1Perl::Critic::Policy::InputOutput::ProhibitJoinedReadline(3)
