RE: [sv-bc] `` macro token gluing operator

This impacts other Mantis issues as well.
One problem is that the LRM uses the term 'token' inconsistently.

Shalom

> -----Original Message-----
> From: Gordon Vreugdenhil [mailto:gordonv@model.com]
> Sent: Thursday, June 21, 2007 6:25 PM
> To: Bresticker, Shalom
> Cc: sv-bc@server.eda.org
> Subject: Re: [sv-bc] `` macro token gluing operator
> 
> 
> I think there is a higher level question that impacts the answers
> here and on Mantis 1537 -- at what level do macros operate
> on text and at what level do they operate on tokens?  There
> is a bit of "token" terminology with respect to token
> splitting so it isn't entirely obvious when one is to tokenize
> versus apply text rules.  This clearly impacts 1537 -- if you
> tokenize prior to applying `` then you treat `` as part of the
> escaped identifier.  If you ignore the escaped identifier
> indication there are other implications in terms of when
> text expansion versus tokenization occurs and what the final
> escaped identifier will be.
> 
> There is someone else here that is going to write something up
> on this front so hopefully we can get a bit more clarity
> in terms of various edge cases.  I don't know when that will
> be done (too much to do on too many fronts) but we'll try to
> get it out soon.
> 
> Gord
> 
> 
> 
> Bresticker, Shalom wrote:
> > Hi,
> >
> > Some questions about ``. (It would be nice to have an official name
> for it.)
> >
> > I have some questions and some suggested answers. Some of these may
> be
> > obvious to you, but they are not explicit in the LRM, and they are
> not
> > obvious to all users.
> >
> >
> >
> > 1.   Is `` limited to the contents of a macro definition or may it
> be
> > used in regular code or in an actual argument of a macro call? My
> > answer: only inside macro definition, not in regular code, and not
> in
> > macro call actual argument.
> >
> >
> >
> > 2.   Can it be used to paste fixed text in the macro definition or
> must
> > it paste a formal argument? My answer: it can be used with fixed
> text.
> > Thus, inside a macro definition, a``b gives you "ab" if a and b are
> not
> > formal arguments. If either or both is a formal argument, then the
> > actual argument is substituted,
> >
> >
> >
> > 3.   Can it be used to paste together anything or only to make an
> > identifier? For example, can I do <``= to get <= ? My answer: it is
> only
> > for making identifiers.
> >
> >
> >
> > Thanks,
> >
> > Shalom
> >
> >
> >
> > Shalom Bresticker
> >
> > Intel Jerusalem LAD DA
> >
> > +972 2 589-6852
> >
> > +972 54 721-1033
> >
> >
> >
> >
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> --
> --------------------------------------------------------------------
> Gordon Vreugdenhil                                503-685-0808
> Model Technology (Mentor Graphics)                gordonv@model.com

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