atais / fixed-length   1.1.0

MIT License GitHub

Scala library for parsing fixed length file format

Scala versions: 2.13 2.12 2.11 2.10

fixed-length Build Status codecov license

A simple Scala library for parsing fixed-length format.

A graceful playground for Shapeless and Cats libraries.


You can find the fixed-length library on Maven Central

Add the library to your dependencies:

Library is cross-compiled for Scala 2.12 and 2.13.

libraryDependencies += "com.github.atais" %% "fixed-length" % "1.1.0"

For Scala 2.10 and 2.11 the latest version is:

libraryDependencies += "com.github.atais" %% "fixed-length" % "0.4.1"


Please find example test scenarios describing simple use cases:


Describe your class with an Encoder, Decoder or Codec typeclass and Parse away!


start: Int

A fixed position in line, where the field begins

end: Int

A fixed position in line, where the field ends

align: Alignment

(default value is Alignment.Left)

Alignment of the field's value in the given area of size end - start

Available options:

  • Alignment.Left
  • Alignment.Right

padding: Char

(default value is ' ')

Fills the remaining space in the given area with the padding Char.

Warning! Wrong selection of padding char may cause decoding issues!

truncate: Truncation

(default value is Truncation.None)

Truncates a field according to the specified start and end position. Keeping the left most characters with Truncation.Left and the right most characters with Truncation.Right.

Available options:

  • Truncation.Left
  • Truncation.Right
  • Truncation.None

defaultValue: A (Decoder only)

(default value is null)

The default value of a field, which will be used in case of any decoding error.

Warning! This will surpress any decoding errors!



sbt release

prepare file sonatype.sbt in ~/.sbt/1.0/ with content:

credentials += Credentials("Sonatype Nexus Repository Manager",