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diff --git a/ext/ply/ANNOUNCE b/ext/ply/ANNOUNCE new file mode 100644 index 000000000..f40902021 --- /dev/null +++ b/ext/ply/ANNOUNCE @@ -0,0 +1,48 @@ +February 19, 2007 + + Announcing : PLY-2.3 (Python Lex-Yacc) + + http://www.dabeaz.com/ply + +I'm pleased to announce a significant new update to PLY---a 100% Python +implementation of the common parsing tools lex and yacc. PLY-2.3 is +a minor bug fix release, but also features improved performance. + +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. + +- PLY can be used to build parsers for large programming languages. + Although it is not ultra-fast due to its Python implementation, + PLY can be used to parse grammars consisting of several hundred + rules (as might be found for a language like C). The lexer and LR + parser are also reasonably efficient when parsing normal + sized programs. + +More information about PLY can be obtained on the PLY webpage at: + + http://www.dabeaz.com/ply + +PLY is freely available and is licensed under the terms of the Lesser +GNU Public License (LGPL). + +Cheers, + +David Beazley (http://www.dabeaz.com)
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