[nem-en] Macros and syntax extensions.

[Sergei Tulentsev]

Yeah, the code in PrettyPrinter seems to be what I need.

And one more off topic question:
every once in a while I see code like this
                  | GrammarElement.Keyword (k) => acc.Write (" ");
acc.Write(k);
acc.Write (" ")

Why not using sprintf, or $-string? Are there special reasons not to do
that? Or this code was writter before those macros and then nobody wanted to
rewrite it?

On 4/30/07, Kamil Skalski <kamil.skalski at gmail.com> wrote:
>
> Look at the PrettyPrinter class, it does exactly this - lookup custom
> syntax of a macro. However this will not be 100% accurate, since
> singly macro can have many possible ways to parse it (the syntax
> extensions are trees, not simple lists).
>
> Maybe it would be feasible to put the original tokens somehow into the
> MacroCall node... but I would prefer the less intrusive solution.
>
> 2007/4/30, Sergei Tulentsev <sergei.tulentsev at gmail.com>:
> > Now I bumped into this couple.
> >
> > In order to format the code, I get bodies of methods as PExpr's. There
> is
> > PExpr.MacroCall.
> > Fine.
> > Almost. :-)
> >
> > This is its definition:
> >      // macros stuff
> >     | MacroCall       { name : Name; ns : NamespaceTree.Node;
> >                          parms : list [SyntaxElement]; }
> >
> > We see no sign of custom syntax that was probably introduced by the
> macro.
> > For example, the "if" macro.
> > if(cond)
> >   true
> >  else
> >   false
> >
> > In this case we will have two elements in parms, literals "true" and
> > "false". But I also need to get parse information about "if" and "else"
> > (more specifically, locations)
> > Or... I need a way to get custom syntax description of that macro.  So
> that
> > I can manually lookup parts of it in the token stream.
> >
> > Any ideas?
> >
> > --
> > Best wishes,
> > Sergei Tulentsev
> > Senior software engineer.
> >
> > SITRONICS Telecom Solutions, Moscow
> > http://www.sitels.ru
> > mob: + 7 916 507 7112
> > _______________________________________________
> > https://nemerle.org/mailman/listinfo/devel-en
> >
> >
>
>
> --
> Kamil Skalski
> http://nazgul.omega.pl
>
> _______________________________________________
> https://nemerle.org/mailman/listinfo/devel-en
>



-- 
Best wishes,
Sergei Tulentsev
Senior software engineer.

SITRONICS Telecom Solutions, Moscow
http://www.sitels.ru
mob: + 7 916 507 7112
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