scanf: Easy and type-safe format strings for parsing and printing

[ library, mit, text ] [ Propose Tags ]

A lightweight library for one-off parsing and printing.


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Versions [faq]
Dependencies base (>=4.7 && <5), template-haskell [details]
License MIT
Copyright 2018 Li-yao Xia
Author Li-yao Xia
Category Text
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Source repo head: git clone
Uploaded by lyxia at 2018-03-18T19:55:48Z
Distributions LTSHaskell:, NixOS:, Stackage:
Downloads 737 total (3 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2018-03-18 [all 1 reports]




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Readme for scanf-

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Haskell scanf Build Status

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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