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Yaccviso visualizes yacc and bison grammars. It will generate a .dot or .vcg file that you can play around with in graphviz (from AT&T research labs fame) or VCG. The graphics above shows a very simple version of the very same yacc grammar which was used to write Yaccviso. Is is especially helpful when you have a large grammar file. Yaccviso will show you the dependencies between the grammar's left hand side (LHS) and its corresponding RHS non terminals and terminal symbols. It just helps to visualize! This is especially true when you have to keep in mind the first- and follow-sets.


Documentation in pdf at


LicenseVerified byVerified onNotes
GPLv2orlaterTed Teah16 October 2006

Leaders and contributors

Axel Belifante Contributor
Aaron Kaplan Maintainer

Resources and communication

Software prerequisites

Kind Description
Required to use bison or yacc
Required to use gcc
Required to use make
Required to use flex 2.5.4 or higher

This entry (in part or in whole) was last reviewed on 16 October 2006.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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