Re: [Chicken-users] source file and line number where a macro is called?

[Alejandro Forero Cuervo]

> From: Alejandro Forero Cuervo <address@hidden>
> Subject: [Chicken-users] source file and line number where a macro is called?
> Date: Mon, 24 May 2010 15:18:18 +0200
> 
> > I'm working in a logging extension.  Simplifying, I would like to be
> > able to write in my code an expression like:
> > 
> >     (logging "Starting evaluation of foo")
> > 
> > To cause an entry like "fooeval.scm:94: Starting evaluation of foo."
> > to be written to some file.  The key aspect is to be able to trace
> > back the location of the expression that caused an entry to be logged.
> > 
> > Is there a way I could make this work?  In other words, how can I make
> > a macro receive the filename and line number where the expression that
> > caused it to be called occurred?
> > 
> 
> There is `get-line-number':
> 
> (define-syntax (ln x r c)
>   (list (r 'quote) (get-line-number x)))
> 
> (print (ln))
> 
> Note that this will not always work and return #f if it can not
> retrieve the line-number. Syntax-expansions will usually receive
> the line number of the containing syntax form. This facility will
> only work in compiled code.

Thanks, Felix!  I will give it a try, see if I can figure out the
contexts in which it won't work and build on it.

Alejo.
http://azul.freaks-unidos.net/