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  • Oct 22 09:14
    LPeter1997 starred pikelet-lang/pikelet
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matrixbot
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atennapel * ```

VCons 1 (VCons 2 (VCons 3 VNil))type: Vec (S (S (S Z))) %Nat
term: VCons {%Nat} {S (S Z)} 1 (VCons {%Nat} {S Z} 2 (VCons {%Nat} {Z} 3 (VNil {%Nat})))
norm: (0, %ReflHEq, 1, 0, %ReflHEq, 2, 0, %ReflHEq, 3, 1, %ReflHEq)
```

atennapel * ```

VCons 1 (VCons 2 (VCons 3 VNil))
type: Vec (S (S (S Z))) %Nat
term: VCons {%Nat} {S (S Z)} 1 (VCons {%Nat} {S Z} 2 (VCons {%Nat} {Z} 3 (VNil {%Nat})))
norm: (0, %ReflHEq, 1, 0, %ReflHEq, 2, 0, %ReflHEq, 3, 1, %ReflHEq)
```

atennapel * The norm is the erased form for a vector of 1, 2, 3. I have to carry around some Refls which is not nice at all...The 0's inbetween is the tag for VCons and the last 1 is the tag for VNil
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atennapel There is an alternative approach where you define Vec n t by pattern matching on the n: case n of { 0 => (); S m => t ** Vec m t } this removes any tags or indices (and proofs). I have no idea how you can define induction over this though, I just created a post on r/dependent_types to ask for help: https://www.reddit.com/r/dependent_types/comments/iufe6x/induction_after_forcing_and_detagging_in_gentle/
brendanzab oh yeah seen that before! it's pretty neat
brendanzab I think something by mcbride or edwin brady?
atennapel Yeah a paper called "Inductive Families need not store their indices" by McBride Brady and McKinna.
brendanzab oh yeah you mention it
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atennapel For now, I just added an unsafe equality elimination that allows the equality to be erased. For Pikelet you can do this erasure safely, if you remain consistent, so you will never have these issues.
atennapel Maybe I can hide the unsafety in some kind of module, using sigma types 🤔
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segeljakt Random shower thought: a rust macro which you put around your AST data structure for generating different versions for different passes of the compiler
segeljakt If you need to for example replace symbolic identifiers with resolved identifiers
brendanzab kind of like nanopass.org?
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segeljakt Hmmm, I don't know, I was just thinking about something which you put on your rust struct or enum that generates multiple versions of them where some fields/variants have different types in each version, maybe you could do it with generics though
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ratmice Yeah, does sound a lot like generics, but speaking of nanopass, there was an interesting nanopass talk this year, https://www.youtube.com/watch?v=lqVN1fGNpZw
ratmice on Implementing the nanopass framework as a nanopass compiler
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brendanzab wish we had something similar for Rust
brendanzab segeljakt: have you seen 'trees that grow' for haskell?
brendanzab but yeah I was more thinking of the def-language side of nanopass
brendanzab * but yeah I was more thinking of the define-language side of nanopass https://docs.racket-lang.org/nanopass/index.html#%28form._%28%28lib._nanopass%2Fbase..rkt%29._define-language%29%29
brendanzab where you can add to and alter languages
brendanzab might also be interesting to look at Ornaments?
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ratmice I once tried to implement it in Ur's typelevel meta-programming stuff, its always seemed quite difficult to pull off the whole thing in a statically typed setting...
brendanzab heh, fun
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segeljakt What stuff should an AST be generic over?
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brendanzab Got some better literal handling now! pikelet-lang/pikelet#223
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brendanzab really need a better test harness so that I can start doing failing tests 😭
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ratmice I'd be interested in trying to stuff the float parsing into json-pop and run it through json-bench, Its float parsing is basically the only thing not on par with other parsers, its currently using lexical.
ratmice The thing that it seems to be is just iterating over each character twice, and then again in lexical, I guess it depends on the morph stuff perhaps
brendanzab ahh... do any of the config things in lexical-core help at all?
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ratmice I'm not sure, haven't looked into it too much, but I haven't seen anything (public in there) that doesn't take a whole buffer, so you have to get to the end of the number before you start converting. It seems like what you implemented implements it digit at a time
ratmice But its certainly probably worth looking at the guts, I just don't think any of that is public there
ratmice Its interesting it seems that the callback changes in Logos change how you need to approach it.
brendanzab yeah that's why I haven't used it
brendanzab my colleague was like 'surely this is solved'?
brendanzab but yeah I really want something that I can decide the syntax of
brendanzab and have it deal with the decoding
matrixbot
@matrixbot
ratmice Also, there is some discussion here of streaming float parsing in this serde issue, Alexhuszagh/rust-lexical#28 In that issue he made a minimal-lexical crate which might be a better an easier starting point for understanding lexical.
ratmice sorry, wrong bug
ratmice * serde-rs/json#536
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brendanzab Implemented a pikelet check command today! pikelet-lang/pikelet#224
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karroffel Very nice!
karroffel Does the next branch have some way to encode enums/ADTs yet? I see everything is built around modules so far which is really cool
karroffel just curious how to base ADTs on records 🙃
brendanzab yeah, need to add that
brendanzab was going to use finite sets to let you describe the 'tags'
brendanzab and then let you dependently eliminate them
brendanzab so:
Option = fun (A : Type) => Record {
    tag : Enum { some, none }, 
    data : match tag {
        some => A,
        none => Record {},
    },
};
`
matrixbot
@matrixbot
brendanzab not sure if there's a good way to have sugar for that