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Diffstat (limited to 'contrib/perl5/lib/strict.pm')
-rw-r--r-- | contrib/perl5/lib/strict.pm | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/contrib/perl5/lib/strict.pm b/contrib/perl5/lib/strict.pm deleted file mode 100644 index 8afb9a3..0000000 --- a/contrib/perl5/lib/strict.pm +++ /dev/null @@ -1,117 +0,0 @@ -package strict; - -=head1 NAME - -strict - Perl pragma to restrict unsafe constructs - -=head1 SYNOPSIS - - use strict; - - use strict "vars"; - use strict "refs"; - use strict "subs"; - - use strict; - no strict "vars"; - -=head1 DESCRIPTION - -If no import list is supplied, all possible restrictions are assumed. -(This is the safest mode to operate in, but is sometimes too strict for -casual programming.) Currently, there are three possible things to be -strict about: "subs", "vars", and "refs". - -=over 6 - -=item C<strict refs> - -This generates a runtime error if you -use symbolic references (see L<perlref>). - - use strict 'refs'; - $ref = \$foo; - print $$ref; # ok - $ref = "foo"; - print $$ref; # runtime error; normally ok - $file = "STDOUT"; - print $file "Hi!"; # error; note: no comma after $file - -There is one exception to this rule: - - $bar = \&{'foo'}; - &$bar; - -is allowed so that C<goto &$AUTOLOAD> would not break under stricture. - - -=item C<strict vars> - -This generates a compile-time error if you access a variable that wasn't -declared via "our" or C<use vars>, -localized via C<my()>, or wasn't fully qualified. Because this is to avoid -variable suicide problems and subtle dynamic scoping issues, a merely -local() variable isn't good enough. See L<perlfunc/my> and -L<perlfunc/local>. - - use strict 'vars'; - $X::foo = 1; # ok, fully qualified - my $foo = 10; # ok, my() var - local $foo = 9; # blows up - - package Cinna; - our $bar; # Declares $bar in current package - $bar = 'HgS'; # ok, global declared via pragma - -The local() generated a compile-time error because you just touched a global -name without fully qualifying it. - -Because of their special use by sort(), the variables $a and $b are -exempted from this check. - -=item C<strict subs> - -This disables the poetry optimization, generating a compile-time error if -you try to use a bareword identifier that's not a subroutine, unless it -appears in curly braces or on the left hand side of the "=E<gt>" symbol. - - - use strict 'subs'; - $SIG{PIPE} = Plumber; # blows up - $SIG{PIPE} = "Plumber"; # just fine: bareword in curlies always ok - $SIG{PIPE} = \&Plumber; # preferred form - - - -=back - -See L<perlmodlib/Pragmatic Modules>. - - -=cut - -$strict::VERSION = "1.01"; - -my %bitmask = ( -refs => 0x00000002, -subs => 0x00000200, -vars => 0x00000400 -); - -sub bits { - my $bits = 0; - foreach my $s (@_){ $bits |= $bitmask{$s} || 0; }; - $bits; -} - -sub import { - shift; - $^H |= bits(@_ ? @_ : qw(refs subs vars)); -} - -sub unimport { - shift; - $^H &= ~ bits(@_ ? @_ : qw(refs subs vars)); -} - -1; |