Haskell scanf 
A lightweight library for one-off parsing and printing.
scanf [fmt|%d lazy %s and %d strict %s|]
"3 lazy functions and 2 strict fields"
= Just (3 :+ "functions" :+ 2 :+ "fields" :+ ())
Quasiquotes are optional. Format strings can also be defined with pure
Haskell combinators.
printf (fmt_ (int . " lazy " % string . " and " % int . " strict " % string)
(8 :+ "dogs" :+ 9 :+ "cats" :+ ())
= "8 lazy dogs and 9 strict cats"
With quasiquotes, the following conversion strings are supported:
%d
: signed integer (Int
)
%l
: signed integer (Integer
, unbounded)
%f
: floating point (Double
)
%s
: string of non-space characters (String
)
%c
: single character (Char
)
%%
: parse/print a literal percent character
N.B.: in scanf
, spaces in the format string match any number of whitespace
character until the next nonspace character.
Though it also offers a printf
function, scanf is thus named as
there are only few other preexisting Haskell implementations,
whereas many Haskell printf libraries can already be found on Hackage.
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