ANNOUNCE 1.4 KB

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  1. August 31, 2016
  2. Announcing : PLY-3.9 (Python Lex-Yacc)
  3. http://www.dabeaz.com/ply
  4. I'm pleased to announce PLY-3.9--a pure Python implementation of the
  5. common parsing tools lex and yacc. PLY-3.9 is a minor bug fix
  6. release. It supports both Python 2 and Python 3.
  7. If you are new to PLY, here are a few highlights:
  8. - PLY is closely modeled after traditional lex/yacc. If you know how
  9. to use these or similar tools in other languages, you will find
  10. PLY to be comparable.
  11. - PLY provides very extensive error reporting and diagnostic
  12. information to assist in parser construction. The original
  13. implementation was developed for instructional purposes. As
  14. a result, the system tries to identify the most common types
  15. of errors made by novice users.
  16. - PLY provides full support for empty productions, error recovery,
  17. precedence rules, and ambiguous grammars.
  18. - Parsing is based on LR-parsing which is fast, memory efficient,
  19. better suited to large grammars, and which has a number of nice
  20. properties when dealing with syntax errors and other parsing
  21. problems. Currently, PLY can build its parsing tables using
  22. either SLR or LALR(1) algorithms.
  23. More information about PLY can be obtained on the PLY webpage at:
  24. http://www.dabeaz.com/ply
  25. PLY is freely available.
  26. Cheers,
  27. David Beazley (http://www.dabeaz.com)