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Re: [ddlm-group] THREAD 3: The alphabet of non-delimited strings.




On 12/10/09 11:33 PM, "James Hester" <jamesrhester@gmail.com> wrote:

> (Prepared before Nick's latest emails)
> 
> Point of clarification: when I stated that tokens would always be
> separated by whitespace, I did not have in mind the contents of
> bracketed constructs; for the purposes of this discussion I consider
> that the whole bracketed construct is a single token (which is
> obviously a simplification).  I'm not sure in which sense Brian
> understood this condition.  So to answer Herbert's question:
> 
> 2.  When writing any quoted construct, we would always follow
> the tailing quote with whitespace.
> 
> Thus in writing a bracketed series of quoted strings, we would
> follow each trailing quote with a space before the comma or
> close bracket, but on read would accept a comma coming
> immediately after the close quote.
> 
> Is that correct?
> 
> No: I had in mind that spaces would have to follow quoted constructs
> only for quoted constructs outside brackets.  Inside brackets, a comma
> or close bracket could also directly follow quoted constructs (and
> unquoted constructs).  Incidentally, I don't understand the need to
> distinguish between reading and writing.

This is the point I have been making the whole time. The trailing space is
unnecessary, but if you insist on it, then what Herb has said is correct.
Unless you create a second production rule or grammar rule for exactly the
same thing, but for when it is in a compound or not. By eliminating the
demand for a trailing whitespace you have only ONE rule per object
irrespective of whether it is in a compound or not.

I think we have agreed that in the specification the token is all that is
necessary, and there is no insistence on whitespace (not withstanding that
writers are expected to pad).

cheers

Nick

--------------------------------
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School of Computer Science & Software Engineering

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