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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 6 May 2020

      I'm soliciting ideas from people who know the Scala compiler better than I do! How might I get nsc to invoke some custom code at some point (not too important when) after typer has run, but before compilation finishes? Are there any hooks available to me?

      3 replies 3 retweets 4 likes
    2. Stephen Judkins‏ @stephenjudkins 6 May 2020
      Replying to @propensive

      A Scala compiler plugin can hook in after any of these stages: https://typelevel.org/scala/docs/phases.html … The API is a bit gnarly and almost certainly will need huge changes to work with Scala 3. But it's there and you can do pretty much anything you want

      1 reply 0 retweets 2 likes
    3. Jon Pretty‏ @propensive 6 May 2020
      Replying to @stephenjudkins

      I'm keen to avoid a compiler plugin if possible, though it would be a valid way to do this. To elaborate on the problem, I have an unknown number of macro expansions happening during typer, and I want to print a report (once only) when all of them have run.

      1 reply 1 retweet 1 like
    4. Stephen Judkins‏ @stephenjudkins 7 May 2020
      Replying to @propensive

      Hmm. Been thinking on this, and here's what I'd do: have some sort of global state that's cleared/initialized by a plugin that runs before macro expansion; macros report to that global state during expansion; plugin runs following expansion that triggers generation of the report

      1 reply 0 retweets 0 likes
    5. Jon Pretty‏ @propensive 7 May 2020
      Replying to @stephenjudkins

      That's not far off my plan, though we can just keep the state in some global singleton object, and it doesn't need to be init'd... we can assume it gets cleaned up by the post-typer code that runs once for every compilation. (My use-case can assume compiles are successful).

      2 replies 0 retweets 0 likes
    6. Jon Pretty‏ @propensive 7 May 2020
      Replying to @propensive @stephenjudkins

      But I'd like to do with without compiler plugins, i.e. "just a library". The ability to do hacky things in the JVM like return instances of anonymous subclasses with overridden methods suggests tantalizing opportunities for getting a fragment of code to run after typer...

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 7 May 2020
      Replying to @propensive @stephenjudkins

      It doesn't even matter if it gets run more than once in the same compilation. We could just synchronize it and flag some mutable state when the report has run. This is horrible horrible hacky stuff, though... ;)

      2:20 PM - 7 May 2020
      0 replies 0 retweets 0 likes

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