Re: lexing

[Ray Andrews <rayandrews@eastlink.ca>]

On 11/29/2015 10:07 AM, Bart Schaefer wrote:
>    The # character introduces a comment ONLY when it is immediately
>    preceded by a command terminator (including start of line) or by
>    whitespace that acts as a word separator.

Ok, so the comment is actually the exception.  That spares me going 
through ZyX's list and seeing which of them is highlighted wrong.  I 
expect there's a big overlap with bash rules anyway, so we're only 
interested in exceptions from bash.
> Everywhere else, # is NOT a comment, in contexts such as:

Yeah, I know the hash is used all over the place, but I've only noticed 
the " (#...) " error so far, tho I suppose I should check all the other 
candidates.
> The form you're using (#something), is only not-a-comment in pattern
> or filename-generation context, so $(# this IS a comment).

When will I run out of things that astonish me about zsh syntax? What 
sort of need would there be to put a comment inside " $(#...) "  ?  So 
that's a comment but " (#b) " is not a comment ... sometimes, but don't 
bet on it.

> Final note:  The one thing zsh borrowed from csh that I freely concede
> is pretty horrible, is the ability to change the comment character by
> changing the third character of $histchars.  Please never do this.
Pardon the mini-rant,  but that's demented.  So the whole edifice of zsh 
lexing, all the stuff mentioned, and everything else, has to be filtered 
thu some engine that first determines if the comment character has been 
changed?  Changed to what? What character is 'free' for assumption as 
the comment marker?  I don' t know if I'll ever understand.
>