OpenGrok

Hi.  This is a simple demo of tree construction and tree parsing with ANTLR
v3.  Here's how to try it out.

$ java org.antlr.Tool LangParser.g LangTreeParser.g
$ javac *.java
$ java Main input

You should see out:

tree: (DECL int a)
int a
`Name`	`Date`	`Size`
Up to higher level directory
`files`	10-Jul-2012	`56`
`input`	10-Jul-2012	`7`
`Lang.g`	10-Jul-2012	`399`
`Lang.tokens`	10-Jul-2012	`61`
`LangDumpDecl.g`	10-Jul-2012	`294`
`LangDumpDecl.h`	10-Jul-2012	`2.2K`
`LangDumpDecl.m`	10-Jul-2012	`7.1K`
`LangDumpDecl.tokens`	10-Jul-2012	`61`
`LangLexer.h`	10-Jul-2012	`1.1K`
`LangLexer.m`	10-Jul-2012	`11.4K`
`LangParser.h`	10-Jul-2012	`4.4K`
`LangParser.m`	10-Jul-2012	`13.7K`
`Main.java`	10-Jul-2012	`694`
`main.m`	10-Jul-2012	`2K`
`output`	10-Jul-2012	`25`
`README.txt`	10-Jul-2012	`240`