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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /systems/texlive/tlnet/tlpkg/tlperl/lib/strict.pm
Initial commit
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+package strict;
+
+$strict::VERSION = "1.11";
+
+my ( %bitmask, %explicit_bitmask );
+
+BEGIN {
+ # Verify that we're called correctly so that strictures will work.
+ # Can't use Carp, since Carp uses us!
+ # see also warnings.pm.
+ die sprintf "Incorrect use of pragma '%s' at %s line %d.\n", __PACKAGE__, +(caller)[1,2]
+ if __FILE__ !~ ( '(?x) \b '.__PACKAGE__.' \.pmc? \z' )
+ && __FILE__ =~ ( '(?x) \b (?i:'.__PACKAGE__.') \.pmc? \z' );
+
+ %bitmask = (
+ refs => 0x00000002,
+ subs => 0x00000200,
+ vars => 0x00000400,
+ );
+
+ %explicit_bitmask = (
+ refs => 0x00000020,
+ subs => 0x00000040,
+ vars => 0x00000080,
+ );
+
+ my $bits = 0;
+ $bits |= $_ for values %bitmask;
+
+ my $inline_all_bits = $bits;
+ *all_bits = sub () { $inline_all_bits };
+
+ $bits = 0;
+ $bits |= $_ for values %explicit_bitmask;
+
+ my $inline_all_explicit_bits = $bits;
+ *all_explicit_bits = sub () { $inline_all_explicit_bits };
+}
+
+sub bits {
+ my $bits = 0;
+ my @wrong;
+ foreach my $s (@_) {
+ if (exists $bitmask{$s}) {
+ $^H |= $explicit_bitmask{$s};
+
+ $bits |= $bitmask{$s};
+ }
+ else {
+ push @wrong, $s;
+ }
+ }
+ if (@wrong) {
+ require Carp;
+ Carp::croak("Unknown 'strict' tag(s) '@wrong'");
+ }
+ $bits;
+}
+
+sub import {
+ shift;
+ $^H |= @_ ? &bits : all_bits | all_explicit_bits;
+}
+
+sub unimport {
+ shift;
+
+ if (@_) {
+ $^H &= ~&bits;
+ }
+ else {
+ $^H &= ~all_bits;
+ $^H |= all_explicit_bits;
+ }
+}
+
+1;
+__END__
+
+=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
+
+The C<strict> pragma disables certain Perl expressions that could behave
+unexpectedly or are difficult to debug, turning them into errors. The
+effect of this pragma is limited to the current file or scope block.
+
+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 was
+neither explicitly declared (using any of C<my>, C<our>, C<state>, or C<use
+vars>) nor fully qualified. (Because this is to avoid variable suicide
+problems and subtle dynamic scoping issues, a merely C<local> variable isn't
+good enough.) See L<perlfunc/my>, L<perlfunc/our>, L<perlfunc/state>,
+L<perlfunc/local>, and L<vars>.
+
+ use strict 'vars';
+ $X::foo = 1; # ok, fully qualified
+ my $foo = 10; # ok, my() var
+ local $baz = 9; # blows up, $baz not declared before
+
+ 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
+is a simple identifier (no colons) and that it appears in curly braces or
+on the left hand side of the C<< => >> symbol.
+
+ use strict 'subs';
+ $SIG{PIPE} = Plumber; # blows up
+ $SIG{PIPE} = "Plumber"; # fine: quoted string is always ok
+ $SIG{PIPE} = \&Plumber; # preferred form
+
+=back
+
+See L<perlmodlib/Pragmatic Modules>.
+
+=head1 HISTORY
+
+C<strict 'subs'>, with Perl 5.6.1, erroneously permitted to use an unquoted
+compound identifier (e.g. C<Foo::Bar>) as a hash key (before C<< => >> or
+inside curlies), but without forcing it always to a literal string.
+
+Starting with Perl 5.8.1 strict is strict about its restrictions:
+if unknown restrictions are used, the strict pragma will abort with
+
+ Unknown 'strict' tag(s) '...'
+
+As of version 1.04 (Perl 5.10), strict verifies that it is used as
+"strict" to avoid the dreaded Strict trap on case insensitive file
+systems.
+
+=cut