Any examples of parser plugins?

[tmcw]

I'm interested in writing a small new plugin to support a particular, proprietary syntax - for example, variables that start with a new character, like @foo. It's very hard to find any examples of plugins that do this, or documentation of how it's done. As far as I can tell:

• All of the parser plugins listed on the site have changed so that they now enable options in the core parser. They don't contain any parsing code.
• I can't find any documentation for implementing parsers on the site. It looks like some of the internal parsers are implemented as mixins on the Parser class, like you would do with acorn, but it's not clear how this is accessible from an external parser.

Thanks for any help!

[liuxingbaoyu]

This is a bit difficult.
Babel parser currently does not provide compatibility guarantees internally, and with the support of new syntax, external plugins may be broken at any time.
And currently I don't know of any parser plugins other than forked repositories.

Maybe you can take a look at this.
https://github.com/acornjs/acorn#plugin-developments