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ELLIOTJS / Perl-Critic-1.083_004 / lib / Perl / Critic / Policy / BuiltinFunctions / ProhibitStringyEval.pm 

            

              
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##############################################################################
#      $URL: http://perlcritic.tigris.org/svn/perlcritic/trunk/Perl-Critic/lib/Perl/Critic/Policy/BuiltinFunctions/ProhibitStringyEval.pm $
#     $Date: 2008-05-18 18:49:57 -0500 (Sun, 18 May 2008) $
#   $Author: clonezone $
# $Revision: 2367 $
##############################################################################
package Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval;
use strict;
use warnings;
use Readonly;
use Perl::Critic::Utils qw{ :severities :classification :ppi };
use base 'Perl::Critic::Policy';
our $VERSION = '1.083_004';
#-----------------------------------------------------------------------------
Readonly::Scalar my $DESC => q{Expression form of "eval"};
Readonly::Scalar my $EXPL => [ 161 ];
#-----------------------------------------------------------------------------
sub supported_parameters { return ()                  }
sub default_severity     { return $SEVERITY_HIGHEST   }
sub default_themes       { return qw( core pbp bugs ) }
sub applies_to           { return 'PPI::Token::Word'  }
#-----------------------------------------------------------------------------
sub violates {
    my ( $self, $elem, undef ) = @_;
    return if $elem ne 'eval';
    return if ! is_function_call($elem);
    my $arg = first_arg($elem);
    return if !$arg;
    return if $arg->isa('PPI::Structure::Block');
    return $self->violation( $DESC, $EXPL, $elem );
}
1;
__END__
#-----------------------------------------------------------------------------
=pod
=head1 NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval - Write C<eval { my $foo; bar($foo) }> instead of C<eval "my $foo; bar($foo);">.
=head1 AFFILIATION
This Policy is part of the core L<Perl::Critic> distribution.
=head1 DESCRIPTION
The string form of C<eval> is recompiled every time it is executed,
whereas the block form is only compiled once.  Also, the string form
doesn't give compile-time warnings.
  eval "print $foo";        #not ok
  eval {print $foo};        #ok
=head1 CONFIGURATION
This Policy is not configurable except for the standard options.
=head1 SEE ALSO
L<Perl::Critic::Policy::ControlStrucutres::RequireBlockGrep>
L<Perl::Critic::Policy::ControlStrucutres::RequireBlockMap>
=head1 AUTHOR
Jeffrey Ryan Thalhammer <thaljef@cpan.org>
=head1 COPYRIGHT
Copyright (c) 2005-2008 Jeffrey Ryan Thalhammer.  All 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.
=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 :