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Subject: bug#60196: 29.0.60; re-builder should read all forms for the rx syntax
Resent-From: Kai Ma <justksqsf@HIDDEN>
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Severity: wishlist

re-builder (rx syntax) currently cannot read multiple forms.  This
results in suboptimal user experience.  For example, even though

    (rx "<i>" (group (*? anychar)) "</i>")

is perfectly fine, but in re-builder, one has to write it as follows:

    '(and "<i>" (group (*? anychar)) "</i>")

Ideally, re-builder should allow users to simply write

    "<i>" (group (*? anychar)) "</i>"

(The relevant function seems to be 'reb-cook-regexp'.)

	Kai

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To: Kai Ma <justksqsf@HIDDEN>
Subject: bug#60196: Acknowledgement (29.0.60; re-builder should read all
 forms for the rx syntax)
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Subject: bug#60196: 29.0.60; re-builder should read all forms for the rx syntax
References: <m2y1r36a1o.fsf@HIDDEN>
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The handling of rx input in re-builder is indeed unsatisfactory. We =
could adopt your proposed solution:

> Ideally, re-builder should allow users to simply write
>=20
>     "<i>" (group (*? anychar)) "</i>"

which would be a definite improvement. We could also accept a Lisp =
expression that is evaluated, so that you'd write

    (rx "<i>" (group (*? anychar)) "</i>")

On the surface this looks more verbose, but since re-builder itself =
would provide the `(rx )` boilerplate, there wouldn't actually be any =
more typing. The main advantage would be that regexps could be built up =
from smaller pieces:

    (rx-let ((spaces (* " "))
             (identifier (: alpha (* alnum))))
      (rx identifier spaces "->" spaces identifier))

Either would be a definite improvement to the current rather strange =
re-builder behaviour with respect to rx input. Any preference?

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Subject: bug#60196: 29.0.60; re-builder should read all forms for the rx syntax
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> On Dec 30, 2022, at 20:28, Mattias Engdeg=C3=A5rd <mattiase@HIDDEN> =
wrote:
>=20
> The handling of rx input in re-builder is indeed unsatisfactory. We =
could adopt your proposed solution:
>=20
>> Ideally, re-builder should allow users to simply write
>>=20
>>    "<i>" (group (*? anychar)) "</i>"
>=20
> which would be a definite improvement. We could also accept a Lisp =
expression that is evaluated, so that you'd write
>=20
>    (rx "<i>" (group (*? anychar)) "</i>")
>=20
> On the surface this looks more verbose, but since re-builder itself =
would provide the `(rx )` boilerplate, there wouldn't actually be any =
more typing.

Good point!  And it is much easier to copy a whole Sexpr.

> The main advantage would be that regexps could be built up from =
smaller pieces:
>=20
>    (rx-let ((spaces (* " "))
>             (identifier (: alpha (* alnum))))
>      (rx identifier spaces "->" spaces identifier))
>=20
> Either would be a definite improvement to the current rather strange =
re-builder behaviour with respect to rx input. Any preference?

I like your proposal better! :-)

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