##############################################################################
#      $URL: http://perlcritic.tigris.org/svn/perlcritic/tags/Perl-Critic-1.092/lib/Perl/Critic/Policy/BuiltinFunctions/ProhibitStringyEval.pm $
#     $Date: 2008-09-02 09:43:48 -0700 (Tue, 02 Sep 2008) $
#   $Author: thaljef $
# $Revision: 2721 $
##############################################################################

package Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval;

use 5.006001;
use strict;
use warnings;
use Readonly;

use Perl::Critic::Utils qw{ :severities :classification :ppi };
use base 'Perl::Critic::Policy';

our $VERSION = '1.092';

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

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|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|Perl::Critic::Policy::ControlStrucutres::RequireBlockGrep>

L<Perl::Critic::Policy::ControlStrucutres::RequireBlockMap|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

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