hunspell: tolerate REP rule count mismatches

lucene/analysis/common/src/java/org/apache/lucene/analysis/hunspell/Dictionary.java

@@ -405,10 +405,18 @@ private void readAffixFile(InputStream affixStream, CharsetDecoder decoder, Flag
       } else if ("TRY".equals(firstWord)) {
         tryChars = firstArgument(reader, line);
       } else if ("REP".equals(firstWord)) {
-        int count = parseNum(reader, line);
-        for (int i = 0; i < count; i++) {
-          String[] parts = splitBySpace(reader, reader.readLine(), 3, Integer.MAX_VALUE);
-          repTable.add(new RepEntry(parts[1], parts[2]));
+        if (tolerateRepRuleCountMismatches()) {
+          String[] parts = splitBySpace(reader, line, 2, Integer.MAX_VALUE);
+          // ignore REP N, as actual N may be incorrect
+          if (parts.length >= 3) {
+            repTable.add(new RepEntry(parts[1], parts[2]));
+          }
+        } else {
+          int count = parseNum(reader, line);
+          for (int i = 0; i < count; i++) {
+            String[] parts = splitBySpace(reader, reader.readLine(), 3, Integer.MAX_VALUE);
+            repTable.add(new RepEntry(parts[1], parts[2]));
+          }
         }
       } else if ("MAP".equals(firstWord)) {
         int count = parseNum(reader, line);
@@ -1168,6 +1176,14 @@ protected boolean tolerateAffixRuleCountMismatches() {
     return false;
   }
 
+  /**
+   * Whether incorrect REP rule counts will be silently ignored. False by default: a {@link
+   * ParseException} will happen.
+   */
+  protected boolean tolerateRepRuleCountMismatches() {
+    return false;
+  }
+
   /**
    * Whether duplicate ICONV/OCONV lines should be silently ignored. False by default: an {@link
    * IllegalStateException} will happen.

lucene/analysis/common/src/test/org/apache/lucene/analysis/hunspell/TestAllDictionaries.java

@@ -77,6 +77,11 @@ static Dictionary loadDictionary(Path aff) throws IOException, ParseException {
         protected boolean tolerateAffixRuleCountMismatches() {
           return true;
         }
+
+        @Override
+        protected boolean tolerateRepRuleCountMismatches() {
+          return true;
+        }
       };
     }
   }

lucene/analysis/common/src/test/org/apache/lucene/analysis/hunspell/TestDictionary.java

@@ -207,6 +207,11 @@ protected boolean tolerateAffixRuleCountMismatches() {
           return true;
         }
 
+        @Override
+        protected boolean tolerateRepRuleCountMismatches() {
+          return true;
+        }
+
         @Override
         protected boolean tolerateDuplicateConversionMappings() {
           return true;

lucene/analysis/common/src/test/org/apache/lucene/analysis/hunspell/forgivable-errors.aff

@@ -1,4 +1,4 @@
-REP 1
+REP 0
 REP foo bar goo doo zoo
 
 COMPOUNDWORDMAX 2 y
@@ -16,4 +16,4 @@ SFX A b c d
 
 ICONV 2
 ICONV x y
-ICONV x y
+ICONV x y