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From: =?UTF-8?Q?Juancarlo_A=C3=B1ez?= <apalala@gmail.com>
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Subject: TatSu 5.0.0 released
Date: Tue, 28 Jan 2020 12:35:04 -0400
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Xref: csiph.com comp.lang.python.announce:3311

=E7=AB=9C TatSu is a tool that takes grammars in a variation of EBNF
<http://en.wikipedia.org/wiki/Ebnf> as input, and outputs memoizing
<http://en.wikipedia.org/wiki/Memoization> (Packrat
<http://bford.info/packrat/>) PEG
<http://en.wikipedia.org/wiki/Parsing_expression_grammar> parsers in Python
<http://python.org/>.

=E7=AB=9C TatSu can compile a grammar stored in a string into a
tatsu.grammars.Grammar object that can be used to parse any given input,
much like the re <https://docs.python.org/3.7/library/re.html> module does
with regular expressions, or it can generate a Python
<http://python.org/> module
that implements the parser.

=E7=AB=9C TatSu supports left-recursive
<https://en.wikipedia.org/wiki/Left_recursion> rules in PEG
<http://en.wikipedia.org/wiki/Parsing_expression_grammar> grammars using
the algorithm <http://norswap.com/pubs/sle2016.pdf> by *Laurent* and *Mens*=
.
The generated AST <http://en.wikipedia.org/wiki/Abstract_syntax_tree> has
the expected left associativity.
<https://github.com/neogeny/TatSu#installation>*CHANGES*


   - =E7=AB=9C TatSu is now only tested against Python 3.8. Earlier version=
s of
   Python are now deprecated, and Python 2.X versions are no longer support=
ed (
   @apalala <https://github.com/apalala>).
   - Apply nameguard only if token[0].isalpha(). This solves a regression
   afecting previous TatSu and Grako grammars (@apalala
   <https://github.com/apalala>).
   - Remove pygraphviz from develoment requirements, as it doesn't build
   under Py38 (@apalala <https://github.com/apalala>)
   - #56 <https://github.com/neogeny/TatSu/issues/56> Include missing
   tatsu/g2e/antlr.ebnf in distribution (@apalala
   <https://github.com/apalala>)
   - #138 <https://github.com/neogeny/TatSu/issues/138> Reimplement the
   calculation of FIRST, FOLLOW, and LOOKAHEAD sets using latest theories.
   For now, this should improve parser error reporting, but should eventual=
ly
   enable the simplification of parsing of leftrec grammars (@apalala
   <https://github.com/apalala>).
   - #153 <https://github.com/neogeny/TatSu/issues/153> Import ABCs from
   collections.abc (@tirkarthi <https://github.com/tirkarthi>)
   - Remove support for Cythonand pypy3 (@apalala
   <https://github.com/apalala>).


--=20
Juancarlo *A=C3=B1ez*