[protobuf] . parser fails with /* comment */ [v2.8]

[knoguchi]

The Proto parser fails to parse /* */ comment. I modified the SchemaParsingTest to include the comment like this

    final protected static String PROTOC_STRINGS_PACKED =
            "message Strings {\n"
            +" repeated string values = 2 [packed=true]; /* comment */\n"
            +"}\n"
    ;

Then run the test

Tests run: 6, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.007 sec <<< FAILURE! - in com.fasterxml.jackson.dataformat.protobuf.SchemaParsingTest
testPacked(com.fasterxml.jackson.dataformat.protobuf.SchemaParsingTest)  Time elapsed: 0.006 sec  <<< ERROR!
java.lang.IllegalStateException: Syntax error in Unnamed-protobuf-schema at 2:45: expected '/'
	at com.squareup.protoparser.ProtoParser.unexpected(ProtoParser.java:903)
	at com.squareup.protoparser.ProtoParser.tryAppendTrailingDocumentation(ProtoParser.java:845)
	at com.squareup.protoparser.ProtoParser.readField(ProtoParser.java:347)
	at com.squareup.protoparser.ProtoParser.readDeclaration(ProtoParser.java:165)
	at com.squareup.protoparser.ProtoParser.readMessage(ProtoParser.java:218)
	at com.squareup.protoparser.ProtoParser.readDeclaration(ProtoParser.java:152)
	at com.squareup.protoparser.ProtoParser.readProtoFile(ProtoParser.java:92)
	at com.squareup.protoparser.ProtoParser.parse(ProtoParser.java:61)
	at com.fasterxml.jackson.dataformat.protobuf.schema.ProtobufSchemaLoader._loadNative(ProtobufSchemaLoader.java:157)
	at com.fasterxml.jackson.dataformat.protobuf.schema.ProtobufSchemaLoader.parseNative(ProtobufSchemaLoader.java:131)
	at com.fasterxml.jackson.dataformat.protobuf.schema.ProtobufSchemaLoader.parse(ProtobufSchemaLoader.java:105)
	at com.fasterxml.jackson.dataformat.protobuf.SchemaParsingTest.testPacked(SchemaParsingTest.java:118)

I know the problem is ProtoParser, and it's deprecated. Are you going to migrate it to Wire Protocol Buffers ? As far as I see the WPB SyntaxReader class knows the comment syntax.

[cowtowncoder]

That is: while it would be nice to upgrade, no one has had need or time to do that, so there is no active plan.
But if anyone has time & itch, I would help with PR.

[knoguchi]

I just noticed ProtoParser supports the trailing /* comment */. There is a test case.

The fix was made in the v4.0.3 (latest version)

Version 4.0.3 (2015-06-27)

• Fix: Support trailing star-style comments (/* hi */) on enum values and fields.

I noticed that you've upgraded in the master branch on the March 31st. So the problem was already fixed when I reported. I was testing 2.8 branch. We can close this issue.

[cowtowncoder]

@knoguchi Ah. Thank you for verifying. Given this, I will backport version upgrade and add unit test. Thanks!