Ecosystem contributions

[kddnewton]

There are many things I would like to do with prism now that it is relatively stable within the ecosystem, but I don't want to open individual issues for it because I don't think it's quite at that stage. So I'm opening a discussion instead to just track the work so that I don't forget.

• We should update AFL++'s grammar file for Ruby here: https://github.com/AFLplusplus/Grammar-Mutator/blob/95a685773e571620cb6e2788dbbdba333e1b9bfd/grammars/nautilus_py_grammars/ruby_custom.py. It currently bears little to no resemblance to the actual Ruby grammar. Since it's a fuzzer it doesn't particularly matter, but hopefully if we improved the grammar it would improve the results of the fuzzing.
• We should use prism's JS bindings to add Ruby to https://astexplorer.net/. It's not a great look that there isn't a Ruby parser on there, and with the JS package it should be relatively easy to add!
• I should finish migrating the syntax tree formatter away from ripper and onto prism. That work is here: https://github.com/ruby-syntax-tree/syntax_tree-prism and already pretty much done, but needs a couple of hours to get it over the finish line.
• We should further investigate a graph-based database of Ruby code based on prism. Work has already been done in this in the ecosystem by ko1 and others, but we should follow-up and help get things published.