From 7cd908d231c1130a6e1bb25f5732043b9e35fb24 Mon Sep 17 00:00:00 2001
From: Joelle Maslak <jmaslak@antelope.net>
Date: Sat, 6 Jul 2019 12:21:28 -0600
Subject: Add solutions for 15.2.1

---
 challenge-015/joelle-maslak/perl5/ch-2.pl | 45 +++++++++++++++++++++++++++++++
 challenge-015/joelle-maslak/perl6/ch-2.p6 | 28 +++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100755 challenge-015/joelle-maslak/perl5/ch-2.pl
 create mode 100755 challenge-015/joelle-maslak/perl6/ch-2.p6

diff --git a/challenge-015/joelle-maslak/perl5/ch-2.pl b/challenge-015/joelle-maslak/perl5/ch-2.pl
new file mode 100755
index 0000000000..076e7d7255
--- /dev/null
+++ b/challenge-015/joelle-maslak/perl5/ch-2.pl
@@ -0,0 +1,45 @@
+#!/usr/bin/env perl
+use v5.26;
+use strict;
+use warnings;
+
+# Turn on method signatures
+use feature 'signatures';
+no warnings 'experimental::signatures';
+
+use autodie;
+
+die("Usage: $0 [--decrypt] <key>") unless @ARGV == 1 or @ARGV == 2;
+die("Usage: $0 [--decrypt] <key>") unless @ARGV == 1 or $ARGV[0] eq '--decrypt';
+die("Usage: $0 [--decrypt] <key>") unless $ARGV[-1] =~ m/^ [a-z]+ $/isx;
+
+my $key     = $ARGV[-1];
+my $decrypt = @ARGV == 2;
+
+my (@keys) = map { ord($_) - ord('a') }
+             split //, fc $key;
+
+# Do we decrypt?
+@keys = map { 26 - $_ } @keys if $decrypt;
+
+my @input;
+while ( my $line = <stdin> ) { push @input, split( //, $line ) }
+
+foreach my $c (@input) {
+    my $offset = $keys[0];
+
+    if ( $c =~ m/ [a-z] /x ) {
+        push @keys, shift @keys;    # Circular buffer
+        my $new = ord($c) + $offset;
+        $new -= 26 if $new > ord('z');
+        print chr($new);
+    } elsif ( $c =~ m/ [A-Z] /x ) {
+        push @keys, shift @keys;    # Circular buffer
+        my $new = ord($c) + $offset;
+        $new -= 26 if $new > ord('Z');
+        print chr($new);
+    } else {
+        print $c;
+    }
+}
+
diff --git a/challenge-015/joelle-maslak/perl6/ch-2.p6 b/challenge-015/joelle-maslak/perl6/ch-2.p6
new file mode 100755
index 0000000000..087f79ed6d
--- /dev/null
+++ b/challenge-015/joelle-maslak/perl6/ch-2.p6
@@ -0,0 +1,28 @@
+#!/usr/bin/env perl6
+use v6;
+
+sub MAIN(Str:D $key where { $_ ~~ m:i/^ <[a..z]>+ $/ }, Bool :$decrypt? ) {
+    my @key-chars = $key.fc.comb;
+
+    my @input = $*IN.slurp.comb;
+
+    for @input -> $c {
+        my $offset = @key-chars[0].ord - 'a'.ord;
+        $offset = 26 - $offset if $decrypt;
+    
+        if $c ~~ m/ <[a..z]> / {
+            @key-chars.append: @key-chars.shift;  # Circular buffer
+            my $new = $c.ord + $offset;
+            $new -= 26 if $new > 'z'.ord;
+            print $new.chr;
+        } elsif $c ~~ m/ <[A..Z]> / {
+            @key-chars.append: @key-chars.shift;  # Circular buffer
+            my $new = $c.ord + $offset;
+            $new -= 26 if $new > 'Z'.ord;
+            print $new.chr;
+        } else {
+            print $c;
+        }
+    }
+}
+
-- 
cgit