If you happy to work with Pycon, the easiest LR(1) generator to use and that generates the fastest Python parsers by far is: http://lrparsing.sourceforge.net/ h

If you happy to work with Pycon, the easiest LR(1) generator to use and that generates the fastest Python parsers by far is: http://lrparsing.sourceforge.net/ http://lrparsing.sourceforge.net/ The documentation is very good and the error messages are (by the standards of for the parsing world) clear. The point the others have made here about error recover being hard for LR parsers still stands, unfortunately. But that's only an issue if you are doing error recovery. Most scripting languages don't.