+#!perl -T
+
+use strict;
+use warnings;
+
+use Test::More 'no_plan';
+
+use Scalar::Vec::Util qw/vrot vcopy SVU_SIZE/;
+
+my $p = SVU_SIZE;
+$p = 8 if $p < 8;
+my $n = 3 * $p;
+my $q = 2;
+
+*myfill = *Scalar::Vec::Util::vfill_pp;
+*myeq = *Scalar::Vec::Util::veq_pp;
+
+sub rst { myfill($_[0], 0, $n, 0); $_[0] = '' }
+
+sub pat {
+ (undef, my $a, my $b, my $c, my $x) = @_;
+ $_[0] = '';
+ myfill($_[0], 0, $a, $x);
+ myfill($_[0], $a, $b, 1 - $x);
+ myfill($_[0], $a + $b, $c, $x);
+ myfill($_[0], $a + $b + $c, $n - ($a + $b + $c), 1 - $x);
+}
+
+sub expected {
+ (undef, my $s, my $l, my $b, my $left) = @_;
+ my $lx = int($l / 2);
+ my $ly = $l - $lx;
+ $b %= $l;
+ $_[0] = '';
+ myfill($_[0], 0, $s, 0);
+ if ($left) {
+ if ($b <= $ly) {
+ myfill($_[0], $s, $b, 0);
+ myfill($_[0], $s + $b, $lx, 1);
+ myfill($_[0], $s + $b + $lx, $l - $lx - $b, 0);
+ } else {
+ myfill($_[0], $s, $b - $ly, 1);
+ myfill($_[0], $s + $b - $ly, $ly, 0);
+ myfill($_[0], $s + $b, $l - $b, 1);
+ }
+ } else {
+ if ($b <= $lx) {
+ myfill($_[0], $s, $lx - $b, 1);
+ myfill($_[0], $s + $lx - $b, $l - $lx, 0);
+ myfill($_[0], $s + $l - $b, $b, 1);
+ } else {
+ myfill($_[0], $s, $ly - ($b - $lx), 0);
+ myfill($_[0], $s + $l - $b, $lx, 1);
+ myfill($_[0], $s + $l + $lx - $b, $b - $lx, 0);
+ }
+ }
+ myfill($_[0], $s + $l, $n - $s - $l, 1);
+}
+
+sub prnt {
+ (undef, my $n, my $desc) = @_;
+ my $i = 0;
+ my $s;
+ $s .= vec($_[0], $i++, 1) while $i < $n;
+ diag "$desc: $s";
+}
+
+my ($v, $v0, $c) = ('', '') x 2;
+
+sub try {
+ my ($left) = @_;
+ my @s = ($p - $q) .. ($p + $q);
+ for my $s (@s) {
+ for my $l (1 .. $n - 1) {
+ last if $s + $l > $n;
+ my $l2 = int($l/2);
+ rst $v0;
+ pat $v0, $s, $l2, $l - $l2, 0;
+ my @b = (0, 3, 5, 7, 11, 13, 17, $l2, $l2 + 1, $l + 1);
+ @b = do { my %seen; ++$seen{$_} for @b; sort keys %seen };
+ for my $b (@b) {
+ $v = $v0;
+ expected $c, $s, $l, $b, $left;
+ $b = -$b unless $left;
+ vrot $v, $s, $l, $b;
+ ok(myeq($v, 0, $c, 0, $n), "vrot $s, $l, $b") or do {
+ diag "n = $n, s = $s, l = $l, l2 = $l2";
+ prnt $v0, $n, 'original';
+ prnt $v, $n, 'got ';
+ prnt $c, $n, 'expected';
+ };
+ is(length $v, length $c, "vrot $s, $l, $b length");
+ }
+ }
+ }
+}
+
+try 1;
+try 0;