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Re: Extending format strings.
"Michael T. Richter" <mtr@ottawa.com> writes:
> 1) Is this correct? Do I have to use %S and a custom method
> dispatched by type? Is there any way to add new formatting
> characters to the control string so I can use the more familiar %f
> et al suite?
I've never done it some I'm not sure. Overriding print-message and
using %S seems like it might work though. You could also use the
'xformat' library available in the Gwydion Dylan contributions area
which is a Dylan version of Lisp's FORMAT - this has many more
features than the Dylan format.
> 2) How do I add print-message methods when it looks like
> print-message is sealed?
In Functional Developer betas, print-message was sealed. I raised this
as a bug and I'm pretty sure they fixed this in the release. Are you
using FD 2.0?
> 3) What is the footprint of print-message anyway? The docs say that
> print-message has two arguments but don't actually provide the order of
> arguments, etc. in any clear fashion.
define method print-message( c :: <my-object>, s :: <stream>) => ()
write(s, "Something about my object);
end;
> 4) Another candidate seems to be to use %= and print-object instead.
> Is this correct or is print-object used for something completely
> different?
I have a custom <money> class and to print it I specialize
print-object and use %= in format to print it. So maybe this is an
approach. Not sure if you specialize print-object for the float
classes though as they might already be specialized and sealed.
Chris.
--
http://www.double.co.nz/dylan
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