The project manipulates text in many ways, organized in lexicons.
To edit our source file we need a text editor, which has to support UTF-8, and can save the edited result as pure text. The tools also have to be setup to handle the utf-8 encoding. You may use emacs and it's modes On a Mac you may use SubEthaEdit.
The project uses a set of morphological compilers which exists in two versions, the xerox and the hfst tools. The xerox tools are the original ones, they are robust and well documented, they are freely available for research, but they are not open source. The hfst tools are open source with no restrictions, but they are still quite new (with version numbers like 0.6). Both compilers compile the same source files, and at Giellatekno we use both compilers.
The xerox compilers
The Xerox tools are: twolc (for morphophonology), lexc (for morphology), xfst (for compiling the final transducer) , and lookup (for analysis and generation).
The xerox tools can be found at fsmbook.com. They are documented in the book referred to on that page (Beesley and Karttunen), we strongly recommend anyone working on morphological transducers, both with xerox and hfst, to buy the book.
- twolc, for phonological and morphophonological rules (cf. a shorter and longer documentation).
- lexc, for representing the Saami stems and the affix lexica (documentation.
- xfst the finite-state transducer tool, for integratingthe different parts of the program, and for compiling the preprocessor (documentation).
- tokenize, for tokenization and processing (cf. documentation), note that we do not use tokenize for preprocessing at the moment, but perl.
- lookup, an interface to the morphological analyser. (documentation, cf. also our lookup notes
The programs are activated by printing e.g. lexc and then pressing the enter key. The tools are documented in Karttunen / Beesley Finite-State Morphology: Xerox Tools and Techniques. The tools may also be installed on your own machine, be it on Mac OSX, Linux or Windows. One version of the software is found on the CD accompanying the book, for the latest version, ask Trond for reference.
The hfst compilers
The hfst tools can be found at the hfst download page. Documentation is found at the hfst wiki. For installation, see also our hfst3 installation page. Note that the documentation is mainly technical, for a pedagogical introduction, we still recommend the Beesley and Karttunen book.
Analysis and testing
The easiest and the most effective way to do this (although a little scary at first) is to use commandline tools. We have made a short introduction in English and a longer document in Norwegian on this topic. The introduction on how to use our parser is also an excellent introduction on how to combine the individual tools.
Our home-made tools, and adjustments of public tools
- The cgi-bin setup for making the parsers accessible on the web
- How the generated paradigms should be presented at web
- The web interface to our web demo
- Conversion scripts
- Testing tools
- Emacs for lexicon expansion
- Special emacs modes
- Autshumato CAT platform