##############################################################################
#      $URL: http://perlcritic.tigris.org/svn/perlcritic/trunk/Perl-Critic/lib/Perl/Critic/Policy/BuiltinFunctions/RequireBlockGrep.pm $
#     $Date: 2007-12-15 15:38:26 -0600 (Sat, 15 Dec 2007) $
#   $Author: clonezone $
# $Revision: 2041 $
##############################################################################

package Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrep;

# DEVELOPER NOTE: this module is used as an example in DEVELOPER.pod.
# If you make changes in here, please reflect those changes in the
# examples.

use strict;
use warnings;
use Readonly;

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

our $VERSION = '1.081_001';

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

Readonly::Scalar my $DESC => q{Expression form of "grep"};
Readonly::Scalar my $EXPL => [ 169 ];

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

sub supported_parameters { return ()                  }
sub default_severity     { return $SEVERITY_HIGH      }
sub default_themes       { return qw( core bugs pbp ) }
sub applies_to           { return 'PPI::Token::Word'  }

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

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

    return if $elem ne 'grep';
    return if ! is_function_call($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::RequireBlockGrep

=head1 DESCRIPTION

The expression forms of C<grep> and C<map> are awkward and hard to read.
Use the block forms instead.

  @matches = grep  /pattern/,    @list;        #not ok
  @matches = grep { /pattern/ }  @list;        #ok

  @mapped = map  transform($_),    @list;      #not ok
  @mapped = map { transform($_) }  @list;      #ok


=head1 SEE ALSO

L<Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval>

L<Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap>

=head1 AUTHOR

Jeffrey Ryan Thalhammer <thaljef@cpan.org>

=head1 COPYRIGHT

Copyright (c) 2005-2007 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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