Re: lexing

[Ray Andrews <rayandrews@eastlink.ca>]

On 11/30/2015 08:23 AM, Bart Schaefer wrote:
> On Nov 29,  8:47pm, Ray Andrews wrote:
> }
> }     $(( ##\e )) is 27,
> }     (( #VAR ))
> }     $(( #var ))
> }
> } ... but, given that there is preceding whitespace, would these three not
> } break Bart's rule? Perhaps the whitespace here is does not qualify as
> } 'word separating'?  Or is the " $(()) " construct an exception?
>
> The whitespace is not "word separating" because (( stuff )) is shorthand
> for
>      let "stuff"
> so the spaces are quoted, at the level at which comments apply.  $(( ))
> is just a way to substitute inline the "let".
>
I thought of that construction as 'math'.  But ... well nuts, so it is, 
and so is 'let' but with the implied quotation. So visually it's a 
gotcha, but not a very deep gotcha.  So it's an exception but it should 
be simple enough to lex. Mysteries evaporate when one sees what's under 
the hood.