Re: How to add pseudo vector types

[Fu Yuan]

> 在 2021年8月3日，上午7:42，Eli Zaretskii <eliz@gnu.org> 写道：
> 
> 
>> 
>> From: Fu Yuan <casouri@gmail.com>
>> Date: Tue, 3 Aug 2021 06:24:34 -0400
>> Cc: Stephen Leake <stephen_leake@stephe-leake.org>,
>> Clément Pit-Claudel <cpitclaudel@gmail.com>,
>> Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
>> 
>> I’m about to change all lisp-facing functions from using byte position to 
>> using point.
> 
> I don't understand how can you do this.  Point is set by Lisp, and
> generally cannot be changed from C, except for very short durations of
> time (or if the C code is the implementation of a Lisp command that
> just moved point).  If you need to access some buffer position, you
> cannot in general use point, because you cannot control where point
> is.
> 
>> Point is much easier to work with.
> 
> In what way is it easier?  I feel that I'm missing something here.
> 
>> If lisp wants byte positions, they can just convert from point themselves.
> 
> ??? What do you mean by that?  Can you show an example?

Oh no, I don’t mean that. I meant that, for example, functions like 
node_start_byte, which returns the byte position of the beginning of the node, 
will now be node_start_pos, which returns a point position. And if I want the 
byte position of the beginning of the node, I can use (position-to-byte 
(tree-sitter-node-start-pos node))

Yuan