Re: New space char syntax

[Kim F. Storm]

Richard Stallman <address@hidden> writes:

>     Actually it isn't; I deliberately excluded `.' from the list of legal
>     symbols which may immediately follow a character constant, since it
>     is a legal symbol character, e.g:
> 
> This complication makes the question tricky; neither alternative
> is entirely right.
> 
>     I can change it so that '(?a. ?b) is allowed,
>     but then shouldn't '(?a.?b) be legal too?
> 
> I don't think so.  I think . should be allowed after the character
> constant if it is a dotted-pair dot, but not if it starts a symbol.

Fixed.  

I changed the syntax to allow a character constant after a dotted-pair
dot, so actually '(?a.?b) does work.  I don't see why it shouldn't be
so.


> 
>     I suggest to handle `;', `#', `[', and `?' as special
>     characters when following a `.' just like `whitespace',
>     `quote', `(' and `"' are today.
> 
> Those cases are simply bugs.  Thanks for identifying them.

Fixed.

Actually, I found that "," was always recognized after a dotted-pair dot,
even when not inside a backquote; I fixed that too.

> 
>     Finally, in a symbol, "`" and "," are not recognized as special 
>     either, e.g.
> 
>           '(a`b,c) => (a\`b\,c)
>           '(a`(b,c)) => (a\` (b\,c))
> 
>     I think the last example shows that they should be recognized.
> 
> It seems logical to handle them like singlequote.

Done.

> 
>     Also, if we fix that for symbols, the "`" and "," should be allowed
>     after a character constant too, e.g.
> 
>           `(?a,xx)
>           '(?a`(b,c))
> 
> I agree.

Done.

-- 
Kim F. Storm <address@hidden> http://www.cua.dk