Let us know how it goes Alberto A good test for your work may be to parse the whole JDK. I did a similar experiment a few years ago. I used Smacc. I had to manually modify some files because the java parser in the Java compiler is written by hand. And it permits things that are not expressed in the grammar. For example: class Foo {} ; is accepted by the Java compiler, but it is hardly accessed by most grammars. Cheers, Alexandre On 9 Sep 2010, at 11:55, Alberto Bacchelli wrote: -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.