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Re: String internals sketch

From: David Kastrup
Subject: Re: String internals sketch
Date: Wed, 15 Mar 2017 16:46:36 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Andy Wingo <address@hidden> writes:

> Hi :)
> On Fri 10 Mar 2017 16:31, David Kastrup <address@hidden> writes:
>> a) Guile already uses two different internal representations: basically
>> UCS-8 and UCS-32.  Adding more internal representations could be done
>> using a number of tables indexed by the internal representation type,
>> making string representations sort of a "plugin".
> I think we probably want to avoid this if we can.  We gain a number of
> efficiencies if we can be concrete.

Maybe use GOOPS on the string ops by diversifying on string subtypes?
One would start by making UCS-32 and UCS-8 string implementations
subtypes of strings, then add UTF-8-internal (which is identical to
UTF-8 for all-valid UTF-8)?  I doubt that this would beat a vector of
dedicated hooks but it might look more transparent to implementors with
special needs?  Maybe not: they might not approach this from a Guile
angle of thinking.

David Kastrup

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