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package Perl::Critic::Policy::ValuesAndExpressions::UndefinedBehaviour +MaybeQuoteit; our $VERSION = '0.01'; use strict; use warnings; use Readonly; use parent 'Perl::Critic::Policy'; use Perl::Critic::Utils qw{ :severities }; sub supported_parameters { return () } sub default_severity { return $SEVERITY_MEDIUM } sub default_themes { return qw< bugs maintenance > } sub applies_to { return qw/PPI::Statement/ } Readonly::Scalar my $DESC => q{$1 not quoted (value not frozen) undefi +ned behaviour}; Readonly::Scalar my $EXPL => q{Maybe $1 should be quoted ( "$1" ) to p +revent undefined behaviour (to freeze the value)}; sub violates { my ( $self, $elem, undef ) = @_; return if ref($elem) !~ m{^(?:PPI::Statement::Variable|PPI::Statem +ent::Expression|PPI::Statement)$}; my $magic = $elem->find('PPI::Token::Magic'); my $operator = $elem->find('PPI::Token::Operator'); my $word = $elem->find('PPI::Token::Word'); if( $magic ){ my $dollar = 0; for my $mag ( @$magic ){ $dollar++ if $mag->content =~ m/^\$\d+$/; } if( $dollar and ( $word or $operator ) ){ return $self->violation( $DESC, $EXPL, $elem ); } } return; } 1; # End of Perl::Critic::Policy::ValuesAndExpressions::UndefinedBehav +iourMaybeQuoteit

Warns/Criticizes on  Foo( $1 ); or  $1 + Foo();

Why? See $1 not "freezing" in an addition

I tested it with perlcritic -3

Seems to work :)

In reply to Perl::Critic::Policy::ValuesAndExpressions::UndefinedBehaviourMaybeQuoteit / $1 not quoted (value not frozen) undefined behaviour by Anonymous Monk

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