Telepen: allow empty content, if user requests it

README.md

@@ -157,9 +157,10 @@ and data.
 
 #### Okapi Barcode 0.4.6
 - QR Code: allow FNC1 escape sequences in user-provided content
-- QR Code: allow empty content, if user requests it
 - Code 39 Extended: allow empty content, if user requests it
+- QR Code: allow empty content, if user requests it
 - UPC/EAN: allow empty content, if user requests it
+- Telepen: allow empty content, if user requests it
 
 #### Okapi Barcode 0.4.5
 - Code 128: allow user to restrict the code sets used to encode data

src/main/java/uk/org/okapibarcode/backend/Telepen.java

@@ -114,7 +114,7 @@ protected void encode() {
 
     private void normalMode() {
 
-        if (!content.matches("[\u0000-\u007F]+")) {
+        if (!content.matches("[\u0000-\u007F]*")) {
             throw OkapiInputException.invalidCharactersInInput();
         }
 
@@ -144,7 +144,7 @@ private void normalMode() {
 
     private void numericMode() {
 
-        if (!content.matches("[0-9X]+")) {
+        if (!content.matches("[0-9X]*")) {
             throw OkapiInputException.invalidCharactersInInput();
         }
 

src/test/resources/uk/org/okapibarcode/backend/telepen/normal-empty.properties

@@ -0,0 +1,13 @@
+PROPERTIES
+
+mode=NORMAL
+emptyContentAllowed=true
+content=
+
+LOG
+
+Check Digit: 0
+
+CODEWORDS
+
+1111111111331111111111111111331111111111

src/test/resources/uk/org/okapibarcode/backend/telepen/numeric-empty.properties

@@ -0,0 +1,13 @@
+PROPERTIES
+
+mode=NUMERIC
+emptyContentAllowed=true
+content=
+
+LOG
+
+Check Digit: 0
+
+CODEWORDS
+
+1111111111331111111111111111331111111111