Parser.getTokenStream() equivalent in C#

[Steve Nicholson]

I'm working through the The Definitive ANTLR 4 Reference, 2e in C#. In the ExtractInterfaceListener class in chapter 4's "Building a Translator with a Listener" section, the line

 

TokenStream tokens = parser.getTokenStream();

doesn't compile (even if I change it to GetTokenStream() to fit C# convention). Also, according to Intellisense, there is no TokenStream type at all, only an ITokenStream interface.

I looked through the JavaParser and Parser classes and neither has a method that returns a TokenStream. In the decompiled source to Parser I saw a couple references to "(ITokenStream) this.InputStream" so I wound up with this:

ITokenStream tokens = (ITokenStream)_parser.InputStream;

The program now runs correctly (after I made a couple changes to Java.g4 to get it to work with C#).

My questions are:

1. Is this an acceptable substitute for parser.getTokenStream()?
2. Is it a bug that there isn't a GetTokenStream() method in the C# version of Parser?

[easj...@ix.netcom.com]

Have you worked thru Sections 3.2 and 3.3 which show a Java main that hooks up a custom lexer, custom parser, etc. and passes the token stream to a custom listener?

 

HTH

[Steve Nicholson]

Yes, I worked through those with no problems. It was just the call to parser.getTokenStream() that hung me up in this section because there was no obvious C# counterpart.

[easj...@ix.netcom.com]

Sorry that didn’t help.  I’ve only worked with Java and ANTLR and don’t know C++. My generated Java parser extends Parser from the ANTLR Java library which has the method you are missing.

 

This tutorial for ANTLR and C++ shows some *include statements but I have no idea what they do.

 

https://tomassetti.me/getting-started-antlr-cpp/

 

Best wishes.

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