new files

Task/Caesar-cipher/Tcl/caesar-cipher-1.tcl

@@ -0,0 +1,23 @@
+package require Tcl 8.6;    # Or TclOO package for 8.5
+
+oo::class create Caesar {
+    variable encryptMap decryptMap
+    constructor shift {
+	for {set i 0} {$i < 26} {incr i} {
+	    # Play fast and loose with string/list duality for shorter code
+	    append encryptMap [format "%c %c %c %c " \
+		    [expr {$i+65}] [expr {($i+$shift)%26+65}] \
+		    [expr {$i+97}] [expr {($i+$shift)%26+97}]]
+	    append decryptMap [format "%c %c %c %c " \
+		    [expr {$i+65}] [expr {($i-$shift)%26+65}] \
+		    [expr {$i+97}] [expr {($i-$shift)%26+97}]]
+	}
+    }
+
+    method encrypt text {
+	string map $encryptMap $text
+    }
+    method decrypt text {
+	string map $decryptMap $text
+    }
+}