Vigenère cipher: Difference between revisions

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@@ Line 539: / Line 539: @@
        std.conv;
-int mod(in int m, in int n) pure nothrow { return ((m % n) + n) % n; }
+enum mod = (in int m, in int n) pure nothrow => ((m % n) + n) % n;
-private auto _s2v(in string s) pure /*nothrow*/ {
+enum _s2v = (in string s) pure /*nothrow*/ =>
-    return s.toUpper.removechars("^A-Z").map!(c => cast(int)c - 'A');
+    s.toUpper.removechars("^A-Z").map!q{ a - 'A' };
-}
-private string _v2s(R)(R v) /*pure nothrow*/ {
+string _v2s(R)(R v) /*pure nothrow*/ {
-    return v.map!(x => cast(char)(x.mod(26) + 'A')).text;
+    return v.map!(x => uppercase[x.mod(26)]).text;
 }
-string encrypt(in string txt, in string key) /*pure nothrow*/ {
+enum encrypt = (in string txt, in string key) /*pure nothrow*/ =>
-    return txt._s2v.zip(key._s2v.cycle).map!q{ a[0] + a[1] }._v2s;
+    txt._s2v.zip(key._s2v.cycle).map!q{ a[0] + a[1] }._v2s;
-}
-string decrypt(in string txt, in string key) /*pure nothrow*/ {
+enum decrypt = (in string txt, in string key) /*pure nothrow*/ =>
-    return txt._s2v.zip(key._s2v.cycle).map!q{ a[0] - a[1] }._v2s;
+    txt._s2v.zip(key._s2v.cycle).map!q{ a[0] - a[1] }._v2s;
-}
 void main() {