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Foma is a compiler for .lexc and .xfst files, written by Måns Hulden.
Foma basic documentation: Write help on the foma command line.
Install graphviz:
sudo port install graphviz
Compile the transducer with foma, and save it as a .dot file:
foma[0] load stack exemplefile.fst
foma[1] print dot > examplefile.dot
foma[1] quit
On the command line
dot -T png -O examplefile.dot
This command creates a .png file, which can be opened:
open examplefile.dot.png
[https://rudifa.wordpress.com/2010/01/10/how-to-run-graphviz-on-the-mac/]