What is SFST?

The SFST tools comprise

• a compiler which translates transducer programs into minimised transducers
• interactive and batch-mode analysis programs
• tools for comparing and printing transducers
• an efficient C++ transducer library

Features

• freely available under the GNU Public License
• easy to learn for users who are familiar with grep, sed, or Perl.
• efficient implementation in C++
• supports
  • a wide range of transducer operations
  • UTF-8 character coding
  • weighted transducers (basic functionality only)

Downloads

• The source code of version 1.2 of the SFST tools
• The source code of version 1.3 of the SFST tools (fst-print now produces a different output format which might affect the graphical viewers listed below)
• A Debian package for SFST (created by Francis Tyers)
• A short manual (included in the source code package)
• A tutorial on the implementation of computational morphologies (included in the source code package)

Further Development

• The AFST project of Anssi Yli-Jyrä
• The HFST project led by Krister Lindén and Kimmo Koskenniemi

Links

• Alex Linke provided
  • an interface to the Graphviz tool for the graphical output of transducers.
• Sebastian Nagel wrote
  • an Emacs mode for editing transducer files and
  • a Perl program which converts SFST transducers to the Graphviz format (similar to that of Alex Linke).
• Stefan Evert also sent me a Graphviz converter.
• Matthias Kistler provided a highlighting mode for the VIM editor.
• Toni Arnold developed
  • a Python interface for the SFST library and
  • Emores, an Empirical MOrphological REaSoning engine for the automatic acquisition of lemmas from a word list.
• Marius L. Jøhndal created a Ruby interface for the SFST library.