Jsonnet BNF?

[Eugene Berman]

I’m not sure if this has been asked before, but I’m wondering if BNF exists for Jsonnet, something I can use to generate a parser code, say, using a Knife parser generator.

I’m trying to build a Java implementation of the language server for jsonnet and the lack of Java parser seems to be the showstopper.

Many thanks!

E.

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Eugene Berman

Principal Architect

7525 SE 24th St, Suite 510

Mercer Island WA 98040

+1 650-235-0288

eugene...@portx.io

[Dave Cunningham]

There is nothing official because implementations have just had handwritten recursive descent parsers.  

Maybe this post from a while ago might be useful? https://groups.google.com/g/jsonnet/c/jOMepyno6ag/m/4kv_OnIjCAAJ

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[Dave Cunningham]

Also there is a scala version and a rust version that may have a parser you can use.  A long time ago there was an attempt to reimplement jsonnet in raw java but I'm not sure how far it got.

BTW are you aware of https://github.com/grafana/jsonnet-language-server and if so why do you want to write a new one in java?

[Eugene Berman]

Yes, I’m familiar with sjsonnet but I found it very difficult to use from the java code.

The reason I want to write my own is because the language is not really jsonnet, it’s datasonnet, it is based on jsonnet but has additional features and ultimately serves a different purpose, so unfortunately I cannot reuse Grafana language server implementation. 

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Eugene Berman

Principal Architect

7525 SE 24th St, Suite 510

Mercer Island WA 98040

+1 650-235-0288

eugene...@portx.io

On Jul 6, 2023, at 11:27 AM, Dave Cunningham <dcu...@google.com> wrote:

Also there is a scala version and a rust version that may have a parser you can use.  A long time ago there was an attempt to reimplement jsonnet in raw java but I'm not sure how far it got.

BTW are you aware of https://github.com/grafana/jsonnet-language-server and if so why do you want to write a new one in java?

On Thu, 6 Jul 2023 at 19:05, Dave Cunningham <dcu...@google.com> wrote:

There is nothing official because implementations have just had handwritten recursive descent parsers.  

Maybe this post from a while ago might be useful? https://groups.google.com/g/jsonnet/c/jOMepyno6ag/m/4kv_OnIjCAAJ

On Thu, 6 Jul 2023 at 15:42, 'Eugene Berman' via Jsonnet <jso...@googlegroups.com> wrote:

I’m not sure if this has been asked before, but I’m wondering if BNF exists for Jsonnet, something I can use to generate a parser code, say, using a Knife parser generator.

I’m trying to build a Java implementation of the language server for jsonnet and the lack of Java parser seems to be the showstopper.

Many thanks!

E.

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Eugene Berman

Principal Architect

7525 SE 24th St, Suite 510

Mercer Island WA 98040

+1 650-235-0288

eugene...@portx.io

[Dave Cunningham]

I'd not heard of datasonnet before.  It sounds interesting!  Is it a totally fresh implementation of a language based on jsonnet?

To view this discussion on the web visit https://groups.google.com/d/msgid/jsonnet/57FE1DB5-8A7D-4CA8-8A91-E6A8078ACE8F%40portx.io.

[yoann padioleau]

There is a tree-sitter grammar for jsonnet, which is quite close to BNF:

https://github.com/sourcegraph/tree-sitter-jsonnet/blob/main/grammar.js

There's also some java bindings to tree-sitter: https://github.com/serenadeai/java-tree-sitter

so in theory you could reuse the tree-sitter-jsonnet parser from Java.