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-rw-r--r--contrib/perl5/lib/strict.pm117
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diff --git a/contrib/perl5/lib/strict.pm b/contrib/perl5/lib/strict.pm
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-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;
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