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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. Tim Sweeney‏ @TimSweeneyEpic 24 Feb 2018
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      Has any programming language defined a data-definition subset which is truly lossless and truly a subset? Something like JSON is to Java, but with rigor. The forward compatibility problem is more subtle than it seems, e.g. as Eric Lippert describes:https://ericlippert.com/2009/05/11/reserved-and-contextual-keywords/ …

      11 replies 0 retweets 32 likes
    2. Per Vognsen‏ @pervognsen 24 Feb 2018
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      Replying to @TimSweeneyEpic

      Quoted Lisp S-expressions?

      2 replies 0 retweets 6 likes
    3. Per Vognsen‏ @pervognsen 24 Feb 2018
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      Replying to @pervognsen @TimSweeneyEpic

      Which is what you get back from (read). But it's not clear to me what exactly you mean by lossless here.

      2 replies 0 retweets 0 likes
    4. Per Vognsen‏ @pervognsen 24 Feb 2018
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      Replying to @pervognsen @TimSweeneyEpic

      Do you mean that every native data type should be losslessly expressible in the data definition subset? What about cyclic structures?

      3 replies 0 retweets 0 likes
      Tim Sweeney‏ @TimSweeneyEpic 24 Feb 2018
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      Replying to @pervognsen

      Yes to all! If the value exists, it should be able to persist as text, and be reloaded while preserving (the language-appropriate kind of) equality. Including finitary value-cyclic structures, and mutable pointer-cyclic structures e.g. in an entity-component system.

      12:42 AM - 24 Feb 2018
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        2. Per Vognsen‏ @pervognsen 24 Feb 2018
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          Replying to @TimSweeneyEpic

          That's where the existing languages I know of fall short. They might support a binary format with that guarantee, but not a literal syntax. Common Lisp comes closest with its #n= and #n# reader syntax but it has the aforementioned limitations, but it'd be easy to support.

          1 reply 0 retweets 0 likes
        3. Per Vognsen‏ @pervognsen 24 Feb 2018
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          Replying to @pervognsen @TimSweeneyEpic

          You could do away with scoping (a bad idea) or separate the introduction of a scoped name from the binding of a datum to that name. Ugly syntax mimicking Common Lisp, but as an example: #foo{ {'a': {'b': #foo=['c']}, 'd': #foo#} #}

          1 reply 0 retweets 1 like
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