[m-rev.] For review: State Variable Transformation

[Ralph Becket]

Fergus Henderson, Tuesday,  7 May 2002:
> On 07-May-2002, Ralph Becket <rafe at cs.mu.OZ.AU> wrote:
> > How about:
> > 
> > 	(DCG notation is intended for writing a particular style of
> > 	parser; in the past it has also been used in non-parsing code to
> > 	thread an implicit state variable, typically the IO state,
> > 	through code.  As a matter of style, we recommend that in future
> > 	DCG notation be reserved for parsing and that state variable
> > 	syntax be used for passing state threads.)
> 
> I don't agree that DCG notation should only be used for parsing.
> DCG should only be used for grammars, sure, but it's quite reasonable
> to use DCGs in the "inverse mode" to *generate* sequences rather than
> to *parse* them.

 	(DCG notation is intended for writing parsers and sequence
	generators in a particular style; ...
 	As a matter of style, we recommend that in future
	DCG notation be reserved for writing parsers and sequence
	generators and a fanatical devotion to the Pope and that state
	variable syntax be used for passing state threads.)

:o)

- RAlph
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