add support for assertions. Updated form of:

Subject: Re: Did the assertion patch/feature submission get overlooked?
Message-ID: <3DE8F439.50402@yahoo.com>

p4raw-id: //depot/perl@18727

1 files changed, 94 insertions, 0 deletions

diff --git a/lib/assertions.pm b/lib/assertions.pm
new file mode 100644
index 0000000000..50e06a76df
--- /dev/null
+++ b/lib/assertions.pm
@@ -0,0 +1,94 @@
+package assertions;
+
+our $VERSION = '0.01';
+
+# use strict;
+# use warnings;
+
+my $hint=0x01000000;
+
+sub import {
+    shift;
+    @_=(scalar(caller)) unless @_;
+
+    if ($_[0] eq '&') {
+	return unless $^H & $hint;
+	shift;
+    }
+	
+    for my $tag (@_) {
+	unless (grep { $tag=~$_ } @{^ASSERTING}) {
+	    $^H &= ~$hint;
+	    return;
+	}
+    }
+    $^H |= $hint;
+}
+
+sub unimport {
+    $^H &= ~$hint;
+}
+
+1;
+__END__
+
+
+=head1 NAME
+
+assertions - selects assertions
+
+=head1 SYNOPSIS
+
+  sub assert (&) : assertion { &{$_[0]}() }
+
+  use assertions 'foo';
+  assert { print "asserting 'foo'\n" };
+
+  {
+      use assertions qw( foo bar );
+      assert { print "asserting 'foo' & 'bar'\n" };
+  }
+
+  {
+      use assertions qw( bar );
+      assert { print "asserting 'bar'\n" };
+  }
+
+  {
+      use assertions qw( & bar );
+      assert { print "asserting 'foo' & 'bar'\n" };
+  }
+
+  assert { print "asserting 'foo' again\n" };
+
+
+=head1 ABSTRACT
+
+C<assertions> pragma selects the tags used to control assertion
+execution.
+
+=head1 DESCRIPTION
+
+
+
+
+=head2 EXPORT
+
+None by default.
+
+=head1 SEE ALSO
+
+
+
+=head1 AUTHOR
+
+Salvador Fandiño, E<lt>sfandino@yahoo.comE<gt>
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright 2002 by Salvador Fandiño
+
+This library is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut