Variable decimal mark without UNA in EDIFACT versions 1-3

src/main/java/io/xlate/edi/internal/stream/tokenization/Dialect.java

@@ -25,7 +25,7 @@ public abstract class Dialect {
     protected char segmentDelimiter;
     protected char segmentTagTerminator = '\0';
     protected char elementDelimiter;
-    protected char decimalMark;
+    protected char decimalMark = '\0';
     protected char releaseIndicator;
     protected char componentDelimiter;
     protected char elementRepeater;

src/main/java/io/xlate/edi/internal/stream/tokenization/EDIFACTDialect.java

@@ -38,7 +38,7 @@ public class EDIFACTDialect extends Dialect {
     StringBuilder header;
     private int index = -1;
     private int unbStart = -1;
-    private boolean ignoreDecimalAdvice;
+    private boolean variableDecimalMark;
 
     private static final int TX_AGENCY = 0;
     private static final int TX_VERSION = 1;
@@ -65,11 +65,11 @@ public String getHeaderTag() {
 
     @Override
     public boolean isDecimalMark(char value) {
-        if (!this.ignoreDecimalAdvice) {
-            return super.isDecimalMark(value);
+        if (variableDecimalMark) {
+            return value == DFLT_DECIMAL_MARK || value == ALT_DECIMAL_MARK;
         }
 
-        return value == DFLT_DECIMAL_MARK || value == ALT_DECIMAL_MARK;
+        return super.isDecimalMark(value);
     }
 
     boolean initialize(CharacterSet characters) {
@@ -78,19 +78,28 @@ boolean initialize(CharacterSet characters) {
         if (parsedVersion.length > 1) {
             this.version = parsedVersion;
             final String syntaxVersion = this.version[1];
-            this.ignoreDecimalAdvice = syntaxVersion.compareTo("4") >= 0;
+            final boolean v4plus = syntaxVersion.compareTo("4") >= 0;
 
             characters.setClass(componentDelimiter, CharacterClass.COMPONENT_DELIMITER);
             characters.setClass(elementDelimiter, CharacterClass.ELEMENT_DELIMITER);
 
-            if (syntaxVersion.compareTo("4") >= 0 || releaseIndicator != ' ') {
+            if (v4plus || !isServiceAdviceSegment(headerTag)) {
+                /*
+                 * Decimal mark is variable:
+                 * - always in version 4
+                 * - when UNA segment is not received prior to version 4
+                 */
+                variableDecimalMark = true;
+            }
+
+            if (v4plus || releaseIndicator != ' ') {
                 // Must not be blank for version 4 and above, may be blank before version 4 if not used
                 characters.setClass(releaseIndicator, CharacterClass.RELEASE_CHARACTER);
             } else {
                 releaseIndicator = '\0';
             }
 
-            if (syntaxVersion.compareTo("4") >= 0) {
+            if (v4plus) {
                 // Must not be blank for version 4 and above
                 characters.setClass(elementRepeater, CharacterClass.ELEMENT_REPEATER);
             } else {

src/main/java/io/xlate/edi/internal/stream/tokenization/Lexer.java

@@ -247,7 +247,7 @@ void parse(IntSupplier inputSource) throws EDIException {
                 break;
             case HEADER_DATA:
             case HEADER_INVALID_DATA:
-                handleStateHeaderData(input);
+                handleStateHeaderData((char) input);
                 eventsReady = dialectConfirmed(State.TAG_SEARCH);
                 break;
             case HEADER_SEGMENT_BEGIN:
@@ -397,8 +397,8 @@ void handleStateInterchangeCandidate(int input) throws EDIException {
         openSegment();
     }
 
-    void handleStateHeaderData(int input) throws EDIException {
-        dialect.appendHeader(characters, (char) input);
+    void handleStateHeaderData(char input) throws EDIException {
+        dialect.appendHeader(characters, input);
 
         switch (characters.getClass(input)) {
         case SEGMENT_DELIMITER:
@@ -412,8 +412,8 @@ void handleStateHeaderData(int input) throws EDIException {
         case RELEASE_CHARACTER:
             break;
         default:
-            if (dialect.getDecimalMark() != input && !characters.isIgnored(input)) {
-                buffer.put((char) input);
+            if (!dialect.isDecimalMark(input) && !characters.isIgnored(input)) {
+                buffer.put(input);
             }
             break;
         }

src/main/java/io/xlate/edi/internal/stream/tokenization/TradacomsDialect.java

@@ -41,7 +41,6 @@ public class TradacomsDialect extends Dialect {
         super(State.DialectCode.TRADACOMS, new String[1]);
         componentDelimiter = DFLT_COMPONENT_ELEMENT_SEPARATOR;
         elementDelimiter = DFLT_DATA_ELEMENT_SEPARATOR;
-        decimalMark = 0;
         releaseIndicator = DFLT_RELEASE_CHARACTER;
         elementRepeater = 0;
         segmentDelimiter = DFLT_SEGMENT_TERMINATOR;

src/test/java/io/xlate/edi/internal/stream/StaEDIStreamWriterTest.java

@@ -18,6 +18,7 @@
 import static io.xlate.edi.test.StaEDITestUtil.normalizeLines;
 import static io.xlate.edi.test.StaEDITestUtil.write;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertSame;
@@ -1864,7 +1865,7 @@ void testGetDelimitersEDIFACT_defaults_v3() throws EDIStreamException {
         assertEquals(':', delimiters.get(Delimiters.COMPONENT_ELEMENT));
         assertEquals('.', delimiters.get(Delimiters.DECIMAL));
         assertEquals('?', delimiters.get(Delimiters.RELEASE));
-        assertNull(delimiters.get(Delimiters.REPETITION)); // Not introduced until v4
+        assertFalse(delimiters.containsKey(Delimiters.REPETITION)); // Not introduced until v4
 
         writer.flush();
         assertEquals("UNB+UNOA:3+005435656:1+006415160:1+060515:1434+00000000000778'",
@@ -1910,8 +1911,8 @@ void testGetDelimitersEDIFACT_noRelease_v3() throws EDIStreamException {
         assertEquals('+', delimiters.get(Delimiters.DATA_ELEMENT));
         assertEquals(':', delimiters.get(Delimiters.COMPONENT_ELEMENT));
         assertEquals('.', delimiters.get(Delimiters.DECIMAL));
-        assertNull(delimiters.get(Delimiters.RELEASE));
-        assertNull(delimiters.get(Delimiters.REPETITION)); // Not introduced until v4
+        assertFalse(delimiters.containsKey(Delimiters.RELEASE));
+        assertFalse(delimiters.containsKey(Delimiters.REPETITION)); // Not introduced until v4
 
         writer.flush();
         assertEquals("UNA:+.  'UNB+UNOA:3+005435656:1+006415160:1+060515:1434+00000000000778'",

src/test/java/io/xlate/edi/internal/stream/tokenization/EDIFACTDialectTest.java

@@ -91,7 +91,7 @@ void testBlankReleaseCharVersion4() throws EDIException {
         assertEquals('\'', edifact.getSegmentTerminator());
         assertEquals('+', edifact.getDataElementSeparator());
         assertEquals(':', edifact.getComponentElementSeparator());
-        assertEquals('.', edifact.getDecimalMark());
+        assertEquals('.', edifact.getDecimalMark()); // UNA value ignored, per spec
         assertEquals('*', edifact.getRepetitionSeparator());
         assertEquals(' ', edifact.getReleaseIndicator());
     }