1 January 31, 2017 2 3 Announcing : PLY-3.10 (Python Lex-Yacc) 4 5 http://www.dabeaz.com/ply 6 7 I'm pleased to announce PLY-3.10--a pure Python implementation of the 8 common parsing tools lex and yacc. PLY-3.10 is a minor bug fix 9 release. It supports both Python 2 and Python 3. 10 11 If you are new to PLY, here are a few highlights: 12 13 - PLY is closely modeled after traditional lex/yacc. If you know how 14 to use these or similar tools in other languages, you will find 15 PLY to be comparable. 16 17 - PLY provides very extensive error reporting and diagnostic 18 information to assist in parser construction. The original 19 implementation was developed for instructional purposes. As 20 a result, the system tries to identify the most common types 21 of errors made by novice users. 22 23 - PLY provides full support for empty productions, error recovery, 24 precedence rules, and ambiguous grammars. 25 26 - Parsing is based on LR-parsing which is fast, memory efficient, 27 better suited to large grammars, and which has a number of nice 28 properties when dealing with syntax errors and other parsing 29 problems. Currently, PLY can build its parsing tables using 30 either SLR or LALR(1) algorithms. 31 32 More information about PLY can be obtained on the PLY webpage at: 33 34 http://www.dabeaz.com/ply 35 36 PLY is freely available. 37 38 Cheers, 39 40 David Beazley (http://www.dabeaz.com)
