[Haskell-cafe] Best way to build strings?
Frank-Andre Riess
riess at informatik.uni-muenchen.de
Wed Jul 20 12:51:10 EDT 2005
Hello there,
> I'm very fond of Python's interpolation approach, where we'd have
> something like the following for the External case:
>
> def __str__(self):
> return "(%s [] %s)" % (self.p, self.q)
are you familiar with C's printf procedure? It's where that kind of notation
comes from.
You can use Text.Printf which provides the function
printf :: PrintfType r => String -> r
Thus you can write
show (Prefix l p) = printf "(%s->%s)" l q
show (External p q) = printf "(%s [] %s)" p q
Alas, I couldn't test it, because the Text module seems to not be installed on
my computer (sad thing not being the admin, isn't it?)
Nevertheless, take a look at
http://www.haskell.org/ghc/docs/latest/html/libraries/base/Text.Printf.html
Regards,
Frank-Andre Riess
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