Capturing first capture group in Lexer

[microsoft]

Capturing first capture group in Lexer

[ZihanChen-MSFT]

Sorry to be responding so late, because this project is not actively maintained as others, and I am the only one that is working on it.

I don't know if I fully understand the issue, but for me it is about how to define the syntax. I believe you could simply write

"{" NAME ":" LABEL "}"

as

"{" NAME ":" (NAME | LABEL ) "}"

and it should just works.

Since LABEL token is a super set of NAME token, by writing the syntax in this way, you don't need to worry about if the parser creates a token stream "{", NAME, ":", NAME, "}" and makes the parser fail.