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Manual Reference Pages  -  PERL::CRITIC::POLICY::INPUTOUTPUT::PROHIBITJOINEDREADLINE (3)

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NAME

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

CONTENTS

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.

<B>NoteB> 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

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perl v5.20.3 PERL::CRITIC::POLICY::INPUTOUTPUT::PROHIBITJOINEDREADLINE (3) 2016-04-03

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