Fix #108

Author: cowtowncoder

csv/src/main/java/com/fasterxml/jackson/dataformat/csv/CsvParser.java

@@ -89,6 +89,15 @@ public enum Feature
          */
         ALLOW_TRAILING_COMMA(true),
 
+        /**
+         * Feature that allows accepting "hash comments" by default, similar to
+         * {@link CsvSchema#withAllowComments(boolean)}. If enabled, such comments
+         * are by default allowed on all columns of all documents.
+         *
+         * @since 2.10
+         */
+        ALLOW_COMMENTS(false),
+        
         /**
          * Feature that allows failing (with a {@link CsvMappingException}) in cases
          * where number of column values encountered is less than number of columns

csv/src/main/java/com/fasterxml/jackson/dataformat/csv/impl/CsvDecoder.java

@@ -256,14 +256,15 @@ public class CsvDecoder
 
     public CsvDecoder(CsvParser owner, IOContext ctxt, Reader r, CsvSchema schema, TextBuffer textBuffer,
             int stdFeatures, int csvFeatures)
-//            boolean autoCloseInput, boolean trimSpaces)
     {
         _owner = owner;
         _ioContext = ctxt;
         _inputSource = r;
         _textBuffer = textBuffer;
         _autoCloseInput =  JsonParser.Feature.AUTO_CLOSE_SOURCE.enabledIn(stdFeatures);
-        _allowComments = JsonParser.Feature.ALLOW_YAML_COMMENTS.enabledIn(stdFeatures);
+        @SuppressWarnings("deprecation")
+        final boolean legacy = JsonParser.Feature.ALLOW_YAML_COMMENTS.enabledIn(stdFeatures);
+        _allowComments = legacy | CsvParser.Feature.ALLOW_COMMENTS.enabledIn(csvFeatures);
         _trimSpaces = CsvParser.Feature.TRIM_SPACES.enabledIn(csvFeatures);
         _inputBuffer = ctxt.allocTokenBuffer();
         _bufferRecyclable = true; // since we allocated it

csv/src/test/java/com/fasterxml/jackson/dataformat/csv/ModuleTestBase.java

@@ -87,11 +87,16 @@ protected ModuleTestBase() { }
     /* Helper methods, setup
     /**********************************************************************
      */
-    
+
     protected CsvMapper mapperForCsv()
     {
         return CsvMapper.builder().build();
     }
+
+    protected CsvMapper.Builder mapperBuilder()
+    {
+        return CsvMapper.builder();
+    }
 
     /*
     /**********************************************************

csv/src/test/java/com/fasterxml/jackson/dataformat/csv/deser/CommentsTest.java

@@ -2,7 +2,6 @@
 
 import java.util.Map;
 
-import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.databind.MappingIterator;
 import com.fasterxml.jackson.dataformat.csv.*;
 
@@ -123,9 +122,10 @@ public void testCommentsWithHeaderRow() throws Exception
     // Alternate test to ensure comments may be enabled
     public void testSimpleCommentsWithDefaultProp() throws Exception
     {
-        CsvMapper mapper = mapperForCsv();
-        mapper.enable(JsonParser.Feature.ALLOW_YAML_COMMENTS);
-        mapper.enable(CsvParser.Feature.WRAP_AS_ARRAY);
+        CsvMapper mapper = mapperBuilder()
+                .enable(CsvParser.Feature.ALLOW_COMMENTS) // since 2.10
+                .enable(CsvParser.Feature.WRAP_AS_ARRAY)
+                .build();
         final String CSV = "# comment!\na,b\n";
 
         MappingIterator<String[]> it = mapper.readerFor(String[].class)

release-notes/VERSION-2.x

@@ -12,6 +12,8 @@ Modules:
 
 #101: Use latest SnakeYAML version 1.23 and get rid of deprecated methods
  (contributed by Andrey S)
+#108: Add new `CsvParser.Feature.ALLOW_COMMENTS` to replace deprecated
+ `JsonParser.Feature.ALLOW_YAML_COMMENTS`
 
 2.9.7 (not yet released)