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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @ManishEarth @graydon_pub

      I’m normally conservative with language changes these days, but this is one area in which I don’t actually care. I think LL(k) is a property that doesn’t matter at all.

      3 replies 0 retweets 4 likes
    2. Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @pcwalton @ManishEarth @graydon_pub

      If you’re parsing Rust for any practical purpose, the complexity class of the grammar isn’t in the top 10 things that are difficult. It isn’t even in the top 100.

      1 reply 0 retweets 7 likes
    3. Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @pcwalton @ManishEarth @graydon_pub

      The things that make parsing languages difficult are things like C’s lexer hack, or the way C++’s template expansion affects parsing. Not theoretical complexity class of the grammar.

      3 replies 0 retweets 2 likes
    4. qualia are a fuck‏ @__anp__ 11 Jan 2019
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      Replying to @pcwalton @ManishEarth @graydon_pub

      something something vim plug-ins?

      1 reply 0 retweets 2 likes
    5. Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @__anp__ @ManishEarth @graydon_pub

      Vim plugins for syntax coloring can’t and don’t parse the grammar. More complex IDE support will just use libsyntax and be done with it.

      2 replies 0 retweets 1 like
    6. russell‏ @rpjohnst 11 Jan 2019
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      Replying to @pcwalton @ManishEarth @graydon_pub

      I'd rather we not conflate all rust parsers into libsyntax- independent implementations are good for keeping the spec unambiguous and understandable

      1 reply 0 retweets 1 like
    7. Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @rpjohnst @ManishEarth @graydon_pub

      It won’t prevent independent implementations. It’s not like unbounded lookahead is that much of a burden in practice!

      1 reply 0 retweets 0 likes
    8. qualia are a fuck‏ @__anp__ 11 Jan 2019
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      Replying to @pcwalton @rpjohnst and

      preventing quality independent implementations?

      1 reply 0 retweets 1 like
    9. Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @__anp__ @rpjohnst and

      Unbounded lookahead doesn’t prevent quality independent implementations. It’s literally a few lines of code in any practical implementation we’re talking about.

      1 reply 0 retweets 0 likes
    10. russell‏ @rpjohnst 11 Jan 2019
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      Replying to @pcwalton @ManishEarth @graydon_pub

      again, not all implementations are hand-written recursive descent, nor can they be

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 11 Jan 2019
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      Replying to @rpjohnst @ManishEarth @graydon_pub

      You can use GLR too. And you can even probably use lexer hacks to make it work with yacc.

      5:05 PM - 11 Jan 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. russell‏ @rpjohnst 11 Jan 2019
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          Replying to @pcwalton @ManishEarth @graydon_pub

          not if you're writing a syntax highlighter in your editor's prescribed format.

          1 reply 0 retweets 0 likes
        3. Patrick Walton‏ @pcwalton 11 Jan 2019
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          Replying to @rpjohnst @ManishEarth @graydon_pub

          All editors’ “prescribed formats” that I know of are all regexes and are insufficient to parse Rust anyway!

          0 replies 0 retweets 0 likes
        4. End of conversation

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