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From: SLOANE@UKANVAX.BITNET.UUCP
Newsgroups: comp.os.vms
Subject: Re: Contemplations on CDU
Message-ID: <8706120149.AA07887@ucbvax.Berkeley.EDU>
Date: Wed, 10-Jun-87 12:16:00 EDT
Article-I.D.: ucbvax.8706120149.AA07887
Posted: Wed Jun 10 12:16:00 1987
Date-Received: Sat, 13-Jun-87 11:11:58 EDT
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Regarding Erland Sommarskog's CLD example, the problem seems to be in
the definition of the word DEFAULT.  I think of DEFAULT as meaning the
value that is supplied by the system WHEN NO VALUE IS GIVEN. If the user
enters some value, then no DEFAULT value should be used. In the example:

   Define Type CHAR_NAMES                  Qualifier WORD_CHARS,
   keyword HYPHEN, default, negatable                Default,
   keyword NUMBERS, default, negatable               Nonnegatable
   keyword UNDERSCORE, negatable                     Value(Required, List,
   ... ! 20 more no-default and negatable                  Type = CHAR_NAMES)
   keyword ALL, nonnegatable

Erland would like HYPHEN and NUMBERS to always be in the list, even though
only UNDERSCORE was entered by the user, as if DEFAULT means that these values
are always in the list BY DEFAULT, not that they are DEFAULT VALUES used by
system when no other value is given. I think either definition is valid.
Suppose, for example, that I was writing the same program as Erland, but for
WORD_CHARS I wanted the default to be ALL, not HYPHEN and NUMBERS.  Then the
program would have to know that the ALL option should only be processed when
there were no other options present.  It would be nice to have it both ways,
but that would mean adding an new option to CDU. In any case, I do not think
that this is a bug in CDU, which was the original question.

                      Bob Sloane
                      University of Kansas
                      Computer Center
                      (913) 864-4291
                      SLOANE@UKANVAX on BITNET