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Subject: bug#38236: R7RS reader does not support datum labels
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R7RS defines a lexical feature called "datum labels"; see section 2.4 in
the report.  An example would be:

   #0=(a b c . #0#)

Guile's reader doesn't support this feature and it's not clear if we
should, in general.  Note, datum literals appear to be incompatible with
array literals.  But we could of course use the R7RS layer as a place to
experiment with a `read' implemented in Scheme.

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To: Andy Wingo <wingo@HIDDEN>
Subject: bug#38236: Acknowledgement (R7RS reader does not support datum
 labels)
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Subject: bug#38236: R7RS reader does not support datum labels
Resent-From: John Cowan <cowan@HIDDEN>
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I don't see where the incompatibility comes in, although more lookahead
would be required.  Per the Guile documentation, neither #n# nor #n= (where
n is a sequence of digits) is a valid array tag.

On Sat, Nov 16, 2019 at 3:50 PM Andy Wingo <wingo@HIDDEN> wrote:

> R7RS defines a lexical feature called "datum labels"; see section 2.4 in
> the report.  An example would be:
>
>    #0=(a b c . #0#)
>
> Guile's reader doesn't support this feature and it's not clear if we
> should, in general.  Note, datum literals appear to be incompatible with
> array literals.  But we could of course use the R7RS layer as a place to
> experiment with a `read' implemented in Scheme.
>
>
>
>

--00000000000046c85e05977e6aa0
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I don&#39;t see where the incompatibility comes in, althou=
gh more lookahead would be required.=C2=A0 Per the Guile documentation, nei=
ther=C2=A0#n# nor #n=3D (where n is a sequence of digits) is a valid array =
tag.</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_at=
tr">On Sat, Nov 16, 2019 at 3:50 PM Andy Wingo &lt;<a href=3D"mailto:wingo@=
pobox.com">wingo@HIDDEN</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex">R7RS defines a lexical feature called &quot;datum=
 labels&quot;; see section 2.4 in<br>
the report.=C2=A0 An example would be:<br>
<br>
=C2=A0 =C2=A0#0=3D(a b c . #0#)<br>
<br>
Guile&#39;s reader doesn&#39;t support this feature and it&#39;s not clear =
if we<br>
should, in general.=C2=A0 Note, datum literals appear to be incompatible wi=
th<br>
array literals.=C2=A0 But we could of course use the R7RS layer as a place =
to<br>
experiment with a `read&#39; implemented in Scheme.<br>
<br>
<br>
<br>
</blockquote></div>

--00000000000046c85e05977e6aa0--

Message sent to bug-guile@HIDDEN:

Subject: bug#38236: R7RS reader does not support datum labels
Resent-From: Mark H Weaver <mhw@HIDDEN>
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From: Mark H Weaver <mhw@HIDDEN>
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Date: Mon, 18 Nov 2019 10:10:30 -0500
In-Reply-To: <87pnhrmtrc.fsf@HIDDEN> (Andy Wingo's message of "Sat, 16 Nov
 2019 21:49:27 +0100")
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Hi Andy,

Andy Wingo <wingo@HIDDEN> writes:

> R7RS defines a lexical feature called "datum labels"; see section 2.4 in
> the report.  An example would be:
>
>    #0=(a b c . #0#)
>
> Guile's reader doesn't support this feature and it's not clear if we
> should, in general.

FYI, I already implemented R7RS datum labels on the 'r7rs-wip' branch
(not to be confused with your new 'wip-r7rs' branch):

  https://git.savannah.gnu.org/cgit/guile.git/commit/?h=r7rs-wip&id=92408ac20e921583b8e4ee26463dc5805ef01153

It depends on the preceding commit on the same branch:

  https://git.savannah.gnu.org/cgit/guile.git/commit/?h=r7rs-wip&id=f687871eceb94bded109569880e696d8862d84fd

There was also a later commit on that branch that enabled compilation of
cyclic literals, but it's no longer applicable to the 'master' branch.

> Note, datum literals appear to be incompatible with array literals.

Can you elaborate on why you believe they're incompatible?  I haven't
looked closely in a while, but I didn't see any incompatibility when I
implemented this before.  Datum labels have '#' or '=' after the
numeral, and I'm not aware of any Guile array syntax that does.

I'm also a bit puzzled why you're apparently planning to rewrite
everything I already did on the 'r7rs-wip' branch.  The main issue on
that branch is that the implementation of *writing* cyclic data turned
out to be a mess, but it could be removed or replaced without affecting
much else.

       Mark

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Subject: bug#38236: R7RS reader does not support datum labels
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From: Andy Wingo <wingo@HIDDEN>
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Hey!

On Mon 18 Nov 2019 16:10, Mark H Weaver <mhw@HIDDEN> writes:

> Andy Wingo <wingo@HIDDEN> writes:
>
>> R7RS defines a lexical feature called "datum labels"; see section 2.4 in
>> the report.  An example would be:
>>
>>    #0=(a b c . #0#)
>>
>> Guile's reader doesn't support this feature and it's not clear if we
>> should, in general.
>
> FYI, I already implemented R7RS datum labels on the 'r7rs-wip' branch
> (not to be confused with your new 'wip-r7rs' branch):
>
>   https://git.savannah.gnu.org/cgit/guile.git/commit/?h=r7rs-wip&id=92408ac20e921583b8e4ee26463dc5805ef01153
>
> It depends on the preceding commit on the same branch:
>
>   https://git.savannah.gnu.org/cgit/guile.git/commit/?h=r7rs-wip&id=f687871eceb94bded109569880e696d8862d84fd
>
> There was also a later commit on that branch that enabled compilation of
> cyclic literals, but it's no longer applicable to the 'master' branch.

Neat!  I had entirely forgotten about this branch.

>> Note, datum literals appear to be incompatible with array literals.
>
> Can you elaborate on why you believe they're incompatible?  I haven't
> looked closely in a while, but I didn't see any incompatibility when I
> implemented this before.  Datum labels have '#' or '=' after the
> numeral, and I'm not aware of any Guile array syntax that does.

I was wrong.  Thanks for the correction!

> I'm also a bit puzzled why you're apparently planning to rewrite
> everything I already did on the 'r7rs-wip' branch.  The main issue on
> that branch is that the implementation of *writing* cyclic data turned
> out to be a mess, but it could be removed or replaced without affecting
> much else.

I had totally forgotten about it.  I am surprised no one on #guile
brought it up either when I was discussing this work!

As you can see, the the writing implementation currently uses srfi-38.

For what it's worth, I do not have future plans to work on R7RS -- I
just wanted --r7rs so that I could have an easy way to benchmark against
other Scheme systems.  A strange reason, admittedly!

Andy

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Andy Wingo <wingo@HIDDEN> writes:
>> I'm also a bit puzzled why you're apparently planning to rewrite
>> everything I already did on the 'r7rs-wip' branch.  The main issue on
>> that branch is that the implementation of *writing* cyclic data turned
>> out to be a mess, but it could be removed or replaced without affecting
>> much else.
>
> I had totally forgotten about it.  I am surprised no one on #guile
> brought it up either when I was discussing this work!

I assumed that you built upon the r7rs-wip branch, but did not check
that assumption.

Best wishes,
Arne

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--=-=-=
Content-Type: text/plain


Andy Wingo <wingo@HIDDEN> writes:
>> I'm also a bit puzzled why you're apparently planning to rewrite
>> everything I already did on the 'r7rs-wip' branch.  The main issue on
>> that branch is that the implementation of *writing* cyclic data turned
>> out to be a mess, but it could be removed or replaced without affecting
>> much else.
>
> I had totally forgotten about it.  I am surprised no one on #guile
> brought it up either when I was discussing this work!

I assumed that you built upon the r7rs-wip branch, but did not check
that assumption.

Best wishes,
Arne

--=-=-=
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