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Re: Interactive parsing with Bison

From: Paul Eggert
Subject: Re: Interactive parsing with Bison
Date: Thu, 29 Jun 2006 23:59:02 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

Richard Stallman <address@hidden> writes:

> Based on the situation now, is the use of dot format
> a temptation to use non-free software, or isn't it?

I'd say "no".

Graphviz itself has been free since 2004 but I understand you may be
worried about the Graphviz community.  To test this, I just now
surveyed all the generators and translators for dot format listed in
<>.  Here's what I found:

  SchemaSpy and Linguine Maps are LGPLed.

  DotML, S-Dot, and ZvonGraphotron use a BSD-like license.

  Sql2Dot is public domain.

  SQL Fairy uses the disjunction of the GPL and the Perl Artistic

  PostgreSQL AutoDoc, Sqlpp, and the gprof filters have no copyright
  notice or license at all.  I suspect the authors just haven't gotten
  around to saying that these programs are free software.

So, from this (admittedly limited) survey, it appears that dot format
is encouraging free software, not non-free.  There wasn't a single
demonstrable non-free program in the bunch.

PS.  In a different catgory, I found Yaccviso
<> which lets you visualize Yacc
grammars, something that would be nice for Bison.  It generates both
dot and VCG formats.  It is GPLed.

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