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Re: Parsing of comments in BNC definition

  • Subject: Re: Parsing of comments in BNC definition
  • From: Nick Spadaccini <nick@xxxxxxxxxxxxx>
  • Date: Fri, 24 Nov 2000 04:58:53 GMT
On Fri, 24 Nov 2000, James Hester wrote:

> The beginning of a file would have to have honorary 'terminate'
> status, otherwise a hash as first character in the file wouldn't count
> as a comment.  

Yes that's right James. I've noted that also, and it is difficult to get
around without introducing other new production items. If you haven't
followed this discussion list before James, I have said it often that
requiring productions for comments complicates things considerably.
That's why most systems just strip comments out at the lexical level.

> I imagine the StarBase program gobbles up as many characters as it can

A common feature of a compiler-compiler, it finds the longest lexeme
matching the production.

> to fit the current context; so, having seen a 'data_' keyword, it
> grabs as many non-blank characters as are in the input stream.  This
> seems like reasonable behaviour.

I hope so.

Nick

--------------------------------
Dr Nick Spadaccini
Department of Computer Science              voice: +(61 8) 9380 3452
University of Western Australia               fax: +(61 8) 9380 1089
Nedlands, Perth,  WA  6907                 email: nick@cs.uwa.edu.au
AUSTRALIA                        web: http://www.cs.uwa.edu.au/~nick



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