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| author | HackBot |
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| date | Wed, 23 Mar 2016 02:40:16 +0000 |
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| 1 October 2, 2015 | |
| 2 | |
| 3 Announcing : PLY-3.8 (Python Lex-Yacc) | |
| 4 | |
| 5 http://www.dabeaz.com/ply | |
| 6 | |
| 7 I'm pleased to announce PLY-3.7--a pure Python implementation of the | |
| 8 common parsing tools lex and yacc. PLY-3.7 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) |