Challenge 135 Task 2 Perl LK

1 files changed, 49 insertions, 0 deletions

diff --git a/challenge-135/lubos-kolouch/perl/ch-2.pl b/challenge-135/lubos-kolouch/perl/ch-2.pl
new file mode 100644
index 0000000000..020faf804d
--- /dev/null
+++ b/challenge-135/lubos-kolouch/perl/ch-2.pl
@@ -0,0 +1,49 @@
+use strict;
+use warnings;
+
+# just a rewrite of the wiki JS code
+#
+
+sub get_letter_value {
+    my $what = shift;
+
+    return $what if $what =~ /\d/;
+    return 9 + ord($what) - ord('A') + 1;
+}
+
+sub checkSedol {
+    my $text = shift;
+
+    my $input       = substr( $text, 0, 6 );
+    my $check_digit = sedol_check_digit($input);
+
+    return 0 unless $text eq $input . $check_digit;
+    return 1;
+}
+
+sub sedol_check_digit {
+    my $char6 = shift;
+
+    return -1 unless ( $char6 =~ /^[0-9BCDFGHJKLMNPQRSTVWXYZ]{6}$/ );
+    my @weight = ( 1, 3, 1, 7, 3, 9, 1 );
+
+    my $sum = 0;
+    for my $i ( 0 .. length($char6) - 1 ) {
+        $sum += $weight[$i] * get_letter_value( substr( $char6, $i, 1 ) );
+    }
+    my $check = ( 10 - $sum % 10 ) % 10;
+
+    return $check;
+}
+
+use Test::More;
+
+is( get_letter_value('B'), 11 );
+is( get_letter_value(1),   1 );
+
+is( checkSedol('0263494'), 1 );
+is( checkSedol('2936921'), 1 );
+is( checkSedol('1234567'), 0 );
+is( checkSedol('B0YBKL9'), 1 );
+
+done_testing;