cfbolz changed the topic of #pypy to: #pypy PyPy, the flexible snake https://pypy.org | IRC logs: https://quodlibet.duckdns.org/irc/pypy/latest.log.html#irc-end and https://libera.irclog.whitequark.org/pypy | the pypy angle is to shrug and copy the implementation of CPython as closely as possible, and staying out of design decisions
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<korvo> I want my RPython interpreter to be easily usable as a subprocess for a composable REPL. I already have a working REPL but I don't want to machine-parse its human-readable output.
<korvo> With that in mind: what are the ways of doing JSON in RPython lately?
<arigato> there is none that I'm aware of
<korvo> Hm, alright. I could try breaking out some of the PyPy stdlib to form a meaningful generic RPython module. I could write my own JSON parser with RPLY. Or I could use jq for this project since I wouldn't be reusing that much of my existing RPython REPL.
<arigato> ...or look at https://github.com/cheery/lever/blob/master/runtime/stdlib/json.py (which I just found with google)
<arigato> unlike what the comment at the top says, the code appears to contain both reading and writing
<korvo> And emitting JSON is merely a tree transformation. (I wish RPython had nice tree transformations and ADTs. If wishes were ponies...)
<korvo> Actually, I can concretize this wish. I wish that we had a good way to provide base classes whose methods can vary in return type.
<korvo> I suppose that we get close by replacing `return ` with `self.rv = ` within implemented methods, and then requiring an impure access for the child at the end. Like a traditional mutable visitor pattern.