Re: [9fans] Recursive structural expressions?

["J. R. Mauro" <jrm8005@gmail.com>]

On Aug 20, 2009, at 21:01, erik quanstrom <quanstro@quanstro.net> wrote:

>> Here's an example. Let's make the syntax extra pukey: @#, where # is
>> 1-9, defines a `named procedure', which is the same thing as putting
>> something in braces in Sam.
>>
>> x/.*\n/ @1{ ( @1 ) | @1 ( @1 ) ( ) | }
>>
>
> x/re/ repeatedly sets . with matches until the input
> is exhausted.  so i don't think i understand your example.
> how does /.*\n/{(.*\n)|.*\n(.*\n)|} match anything
> but the tautological .*\n|?  for example, if the input
> is "line1\nline2\n", then . is in turn "line1\n" and "line2\n",
> and both match .*\n|.
>
> where do the actions go in your example?

I guess I botched the example a bit. The whole part after the @ should
be in an x//, and the actions would come after. Something more
complicated would allow you to match any parenthetical expression on a
line and alter it, which could be useful.

>
> - erik
>