October 2, 2015

Announcing : PLY-3.8 (Python Lex-Yacc)

http://www.dabeaz.com/ply

I'm pleased to announce PLY-3.7--a pure Python implementation of the

common parsing tools lex and yacc. PLY-3.7 is a minor bug fix

release. It supports both Python 2 and Python 3.

If you are new to PLY, here are a few highlights:

- PLY is closely modeled after traditional lex/yacc. If you know how

to use these or similar tools in other languages, you will find

PLY to be comparable.

- PLY provides very extensive error reporting and diagnostic

information to assist in parser construction. The original

implementation was developed for instructional purposes. As

a result, the system tries to identify the most common types

of errors made by novice users.

- PLY provides full support for empty productions, error recovery,

precedence rules, and ambiguous grammars.

- Parsing is based on LR-parsing which is fast, memory efficient,

better suited to large grammars, and which has a number of nice

properties when dealing with syntax errors and other parsing

problems. Currently, PLY can build its parsing tables using

either SLR or LALR(1) algorithms.

More information about PLY can be obtained on the PLY webpage at:

http://www.dabeaz.com/ply

PLY is freely available.

Cheers,

David Beazley (http://www.dabeaz.com)