Manfred Lotz wrote at 12/17/2010 01:58 AM:
[...]
(format t "~,5f" pi)
[...]
Is there anything similar to CL's format in Racket?
It would be nice to have a some special support for decimal-point
formatting in Racket's "format". Just the number of decimal places to
print would be nice. (Other formatting, such as whitespace padding, is
a lot less relevant now that we use HTML and graphics languages rather
than ASCII text with fixed-pitch characters for formatting. And I
woudn't want CL's "format" -- I recall thinking it was an overpowered
minilanguage to be stuffing into a string.)
If nobody steps up to the plate for number formatting, I will make a
PLaneT package out of some code in my Racket invoicing setup. This code
defines special syntax for defining individual number formatters (for,
e.g., printing US dollars and cents in a conventional US style). It's
not the end-all-be-all, which is why I haven't PLaneT-ized it already,
but it's done what I've needed so far.
(define-syntax %make-number-displayer/macro
(syntax-rules ()
((_ sign
prefix
pad-whole-char
pad-whole-length
whole-spacers-char
whole-spacers-interval
decimal-point
max-fractional-length
pad-fractional-char
pad-fractional-length
suffix)
--
http://www.neilvandyke.org/
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