Antlr4 grammar for Java8 and more specifically for Lambda expressions

[Michail Basios]

Hi guys,

This is my first post as I am quite new to Antlr4. I am currently using the Antlr4 generated classes for parsing Java source files and extracting some information about the classes, methods and variables being used and also for some code transformations. 

For doing this task I am using the Java7 provided grammar file. However, I was thinking that I would really like to work on the new features that Java8 is going to provide and more specifically on lambda expressions. 

So what I would like to ask is,

1) Is there any plan for providing a Java8.g4 grammar soon?

2) If not, how difficult would it be for me, that don't have that much experience with grammars, to extend the existing Java7.g4 grammar so as to support lambda expressions and other Java8 features.

Thanks in advance.

Mike.

[Michail Basios]

I saw that Terence has added the Java8 grammar (for now is still Java7) to the github grammars folder:

https://github.com/antlr/grammars-v4/tree/master/java8

[Terence Parr]

We have  a new feature coming for ANTLR 4.3 that will automatically rewrite indirect left recursion, which allows us to take the language specification directly from the Java spec and have it work…hang tight!  hopefully in the next couple months

T

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[Terence Parr]

 We have a Java8 grammar that is literally the exact spec, but it requires a major update to ANTLR that automatically transforms grammars. Sam is working on it but we don't know when it will be done. so the grammar will wait until a future ANTLR update.

T

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