perl/perl-5.31.4-Handle-undefined-values-correctly.patch

From 01aed385e6bdbdcfd13bb66e9d8b7c55d2cfc34a Mon Sep 17 00:00:00 2001
From: James E Keenan <jkeenan@cpan.org>
Date: Thu, 19 Sep 2019 23:02:54 -0400
Subject: [PATCH] Handle undefined values correctly
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As reported by Henrik Pauli in RT 134441, the documentation's claim that

        $dv->dumpValue([$x, $y]);

and

        $dv->dumpValues($x, $y);

was not being sustained in the case where one of the elements in the
array (or array ref) was undefined.  This was due to an insufficiently
precise specification within the dumpValues() method for determining
when the value "undef\n" should be printed.

Tests for previously untested cases have been provided in
t/rt-134441-dumpvalue.t.  They were not appended to t/Dumpvalue.t (as
would normally have been the case) because the tests in that file have
accreted over the years in a sub-optimal manner:  changes in attributes
of the Dumpvalue object are tested but those changes are not zeroed-out
(by, e.g., use of 'local $self->{attribute} = undef')
before additional attributes are modified and tested.  As a consequence,
it's difficult to determine the state of the Dumpvalue object at any
particular point and interactions between attributes cannot be ruled
out.

Package TieOut, used to capture STDOUT during testing, has been
extracted to its own file so that it can be used by all test files.

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 MANIFEST                               |  2 +
 dist/Dumpvalue/lib/Dumpvalue.pm        |  4 +-
 dist/Dumpvalue/t/Dumpvalue.t           | 20 +-----
 dist/Dumpvalue/t/lib/TieOut.pm         | 20 ++++++
 dist/Dumpvalue/t/rt-134441-dumpvalue.t | 86 ++++++++++++++++++++++++++
 5 files changed, 112 insertions(+), 20 deletions(-)
 create mode 100644 dist/Dumpvalue/t/lib/TieOut.pm
 create mode 100644 dist/Dumpvalue/t/rt-134441-dumpvalue.t

diff --git a/MANIFEST b/MANIFEST
index 7bf62d8479..8159ac8cc1 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -3455,6 +3455,8 @@ dist/Devel-SelfStubber/lib/Devel/SelfStubber.pm	Generate stubs for SelfLoader.pm
 dist/Devel-SelfStubber/t/Devel-SelfStubber.t	See if Devel::SelfStubber works
 dist/Dumpvalue/lib/Dumpvalue.pm	Screen dump of perl values
 dist/Dumpvalue/t/Dumpvalue.t	See if Dumpvalue works
+dist/Dumpvalue/t/lib/TieOut.pm	Helper module for Dumpvalue tests
+dist/Dumpvalue/t/rt-134441-dumpvalue.t	See if Dumpvalue works
 dist/encoding-warnings/lib/encoding/warnings.pm	warn on implicit encoding conversions
 dist/encoding-warnings/t/1-warning.t	tests for encoding::warnings
 dist/encoding-warnings/t/2-fatal.t	tests for encoding::warnings
diff --git a/dist/Dumpvalue/lib/Dumpvalue.pm b/dist/Dumpvalue/lib/Dumpvalue.pm
index eef9b27157..3faf829538 100644
--- a/dist/Dumpvalue/lib/Dumpvalue.pm
+++ b/dist/Dumpvalue/lib/Dumpvalue.pm
@@ -1,7 +1,7 @@
 use 5.006_001;			# for (defined ref) and $#$v and our
 package Dumpvalue;
 use strict;
-our $VERSION = '1.18';
+our $VERSION = '1.19';
 our(%address, $stab, @stab, %stab, %subs);
 
 sub ASCII { return ord('A') == 65; }
@@ -79,7 +79,7 @@ sub dumpValues {
   my $self = shift;
   local %address;
   local $^W=0;
-  (print "undef\n"), return unless defined $_[0];
+  (print "undef\n"), return if (@_ == 1 and not defined $_[0]);
   $self->unwrap(\@_,0);
 }
 
diff --git a/dist/Dumpvalue/t/Dumpvalue.t b/dist/Dumpvalue/t/Dumpvalue.t
index 7063dd984c..ba8775126e 100644
--- a/dist/Dumpvalue/t/Dumpvalue.t
+++ b/dist/Dumpvalue/t/Dumpvalue.t
@@ -16,6 +16,8 @@ BEGIN {
 
 our ( $foo, @bar, %baz );
 
+use lib ("./t/lib");
+use TieOut;
 use Test::More tests => 88;
 
 use_ok( 'Dumpvalue' );
@@ -278,21 +280,3 @@ is( $out->read, "0  0..0  'two'\n", 'dumpValues worked on array ref' );
 $d->dumpValues('one', 'two');
 is( $out->read, "0..1  'one' 'two'\n", 'dumpValues worked on multiple values' );
 
-
-package TieOut;
-use overload '"' => sub { "overloaded!" };
-
-sub TIEHANDLE {
-	my $class = shift;
-	bless(\( my $ref), $class);
-}
-
-sub PRINT {
-	my $self = shift;
-	$$self .= join('', @_);
-}
-
-sub read {
-	my $self = shift;
-	return substr($$self, 0, length($$self), '');
-}
diff --git a/dist/Dumpvalue/t/lib/TieOut.pm b/dist/Dumpvalue/t/lib/TieOut.pm
new file mode 100644
index 0000000000..568caedf9c
--- /dev/null
+++ b/dist/Dumpvalue/t/lib/TieOut.pm
@@ -0,0 +1,20 @@
+package TieOut;
+use overload '"' => sub { "overloaded!" };
+
+sub TIEHANDLE {
+	my $class = shift;
+	bless(\( my $ref), $class);
+}
+
+sub PRINT {
+	my $self = shift;
+	$$self .= join('', @_);
+}
+
+sub read {
+	my $self = shift;
+	return substr($$self, 0, length($$self), '');
+}
+
+1;
+
diff --git a/dist/Dumpvalue/t/rt-134441-dumpvalue.t b/dist/Dumpvalue/t/rt-134441-dumpvalue.t
new file mode 100644
index 0000000000..cc9f270f5a
--- /dev/null
+++ b/dist/Dumpvalue/t/rt-134441-dumpvalue.t
@@ -0,0 +1,86 @@
+BEGIN {
+	require Config;
+	if (($Config::Config{'extensions'} !~ m!\bList/Util\b!) ){
+	    print "1..0 # Skip -- Perl configured without List::Util module\n";
+	    exit 0;
+	}
+
+	# `make test` in the CPAN version of this module runs us with -w, but
+	# Dumpvalue.pm relies on all sorts of things that can cause warnings. I
+	# don't think that's worth fixing, so we just turn off all warnings
+	# during testing.
+	$^W = 0;
+}
+
+use lib ("./t/lib");
+use TieOut;
+use Test::More tests => 17;
+
+use_ok( 'Dumpvalue' );
+
+my $d;
+ok( $d = Dumpvalue->new(), 'create a new Dumpvalue object' );
+
+my $out = tie *OUT, 'TieOut';
+select(OUT);
+
+my (@foobar, $x, $y);
+
+@foobar = ('foo', 'bar');
+$d->dumpValue([@foobar]);
+$x = $out->read;
+is( $x, "0  'foo'\n1  'bar'\n", 'dumpValue worked on array ref' );
+$d->dumpValues(@foobar);
+$y = $out->read;
+is( $y, "0  'foo'\n1  'bar'\n", 'dumpValues worked on array' );
+is( $y, $x,
+    "dumpValues called on array returns same as dumpValue on array ref");
+
+@foobar = (undef, 'bar');
+$d->dumpValue([@foobar]);
+$x = $out->read;
+is( $x, "0  undef\n1  'bar'\n",
+    'dumpValue worked on array ref, first element undefined' );
+$d->dumpValues(@foobar);
+$y = $out->read;
+is( $y, "0  undef\n1  'bar'\n",
+    'dumpValues worked on array, first element undefined' );
+is( $y, $x,
+    "dumpValues called on array returns same as dumpValue on array ref, first element undefined");
+
+@foobar = ('bar', undef);
+$d->dumpValue([@foobar]);
+$x = $out->read;
+is( $x, "0  'bar'\n1  undef\n",
+    'dumpValue worked on array ref, last element undefined' );
+$d->dumpValues(@foobar);
+$y = $out->read;
+is( $y, "0  'bar'\n1  undef\n",
+    'dumpValues worked on array, last element undefined' );
+is( $y, $x,
+    "dumpValues called on array returns same as dumpValue on array ref, last element undefined");
+
+@foobar = ('', 'bar');
+$d->dumpValue([@foobar]);
+$x = $out->read;
+is( $x, "0  ''\n1  'bar'\n",
+    'dumpValue worked on array ref, first element empty string' );
+$d->dumpValues(@foobar);
+$y = $out->read;
+is( $y, "0  ''\n1  'bar'\n",
+    'dumpValues worked on array, first element empty string' );
+is( $y, $x,
+    "dumpValues called on array returns same as dumpValue on array ref, first element empty string");
+
+@foobar = ('bar', '');
+$d->dumpValue([@foobar]);
+$x = $out->read;
+is( $x, "0  'bar'\n1  ''\n",
+    'dumpValue worked on array ref, last element empty string' );
+$d->dumpValues(@foobar);
+$y = $out->read;
+is( $y, "0  'bar'\n1  ''\n",
+    'dumpValues worked on array, last element empty string' );
+is( $y, $x,
+    "dumpValues called on array returns same as dumpValue on array ref, last element empty string");
+
-- 
2.21.0