Add ROT-13 conversion

src/app/converter/rot13converter.ts

@@ -0,0 +1,25 @@
+import {Converter} from './converter';
+
+export class ROT13Converter implements Converter {
+  getDisplayname(): string {
+    return 'Perform ROT-13';
+  }
+
+  getId(): string {
+    return 'rot13convert';
+  }
+
+  convert(input: string): string {
+    try {
+      const inChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+      const outChars = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm';
+      const translate = c => {
+        const charIndex = inChars.indexOf(c);
+        return charIndex > -1 ? outChars[charIndex] : c;
+      };
+      return input.split('').map(translate).join('');
+    } catch (exception) {
+      throw new Error('Could not perform ROT-13 conversion. Maybe corrupt input?');
+    }
+  }
+}

src/app/converterregistry.service.ts

@@ -19,6 +19,7 @@ import {PunycodeEncoder} from './converter/punycodeencoder';
 import {PunycodeDecoder} from './converter/punycodedecoder';
 import {UTF8Encoder} from './converter/utf8encoder';
 import {UTF8Decoder} from './converter/utf8decoder';
+import {ROT13Converter} from './converter/rot13converter';
 
 @Injectable()
 export class ConverterRegistryService {
@@ -60,6 +61,7 @@ export class ConverterRegistryService {
     this.registerConverter(new PunycodeDecoder(this.wrapper));
     this.registerConverter(new UTF8Encoder(this.wrapper));
     this.registerConverter(new UTF8Decoder(this.wrapper));
+    this.registerConverter(new ROT13Converter());
   }
 
   private registerConverter(converter: Converter): void {