static rotors

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/Enigmatic/Rotor.pm b/lib/Enigmatic/Rotor.pm
new file mode 100644
index 0000000..a600b43
--- /dev/null
+++ b/lib/Enigmatic/Rotor.pm
@@ -0,0 +1,50 @@
+package Enigmatic::Rotor;
+use DAKKAR::p 'class';
+use Enigmatic::Types qw(WiringMap Letter RotorPos);
+
+has wiring => (
+    is => 'ro',
+    isa => WiringMap,
+    coerce => 1,
+);
+
+has ring_setting => (
+    is => 'rw',
+    isa => RotorPos,
+    default => 0,
+);
+
+around BUILDARGS => sub {
+    my $orig  = shift;
+    my $class = shift;
+
+    if ( @_ == 1 && !ref $_[0] ) {
+        return $class->$orig( wiring => $_[0] );
+    }
+    else {
+        return $class->$orig(@_);
+    }
+};
+
+sub map {
+    my $self = shift;
+    my ($letter) = pos_validated_list(
+        \@_,
+        { isa => Letter },
+    );
+
+    return $self->wiring->at($self->_apply_ring_setting($letter));
+}
+
+sub _apply_ring_setting {
+    my $self = shift;
+    my ($letter) = pos_validated_list(
+        \@_,
+        { isa => Letter },
+    );
+
+    return chr(
+        (ord($letter) - ord('A') + $self->ring_setting)
+            % 26
+                +ord('A') );
+}