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Hdrug is an environment to develop logic grammars / parsers / generators for natural languages. Hdrug offers various tools to visualize lexical entries, grammar rules, definite-clause definitions, parse trees, feature structures, lexical- rule- and type-hierarchies, graphs of the comparison of different parsers on a corpus of test sentences etc., in a Tk widget, LaTeX/DVI format, and the Clig system.

The package comes with a number of example grammars, including a Categorial Grammar, a Tree Adjoining Grammar, a Unification Grammar in the spirit of Head-driven Phrase Structure Grammar, an Extraposition Grammar and a Definite Clause Grammar. Each of the grammars comes with a set of parsers, such as Earley-like chart parsers, left-corner parsers and head-driven parsers. Some grammars come with variants of the head-driven generator.

Current Version:   3.9.7

License Type:   GPL

Home Site:

Source Code Availability:   Yes

Available Binary Packages:

  • Debian Package:   No
  • RedHat RPM Package:   No
  • Other Packages:   Yes (at FTP site below)

Targeted Platforms:

Hdrug is written in Sicstus Prolog version 3 and uses the Tcl/Tk library for the interface between Prolog and Tcl/Tk.

Software/Hardware Requirements:

Prolog compiler and Tcl/Tk

Other Links: (FTP Site)

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