[antlr-interest] Re: JavaTreeParser? What does it do?

jw9315 jw9315 at bris.ac.uk
Mon Apr 28 17:48:35 PDT 2003


Hi,
yeah, sorry I did see that linkm but I'm new to this and didn't quite 
understand. What I'm trying to do is build an interpreter for a 
*small* subset of the Java language. I ran the example in the Java 
grammars folder to give me a nice AST tree for any program I type in 
at the command line, and was planning on parsing and interpreting the 
program using the method calls such as .getChild(). 

What I was confused about is the fact that I call such as "AST myAST 
= r.getFirstChild();", but what is the difference between this and 
the line "JavaTreeParser tparse = new JavaTreeParser();". I can't 
understand what you can do differently with the two different 
commands! Sorry if this is a really stupid question but if there's a 
short answer that anyone's willing to give I would be glad to hear it.
Thanks,
Jon

--- In antlr-interest at yahoogroups.com, Terence Parr <parrt at j...> 
wrote:
> Hi.  Have you checked the faq entry that answers your question?
> 
> http://www.jguru.com/faq/view.jsp?EID=818959
> 
> It's called: What is a tree parser and why would I want to use one?
> 
> <snicker>
> 
> Terence
> 
> On Monday, April 28, 2003, at 10:17  AM, jw9315 wrote:
> 
> > Hi,
> > I'm a brand new ANTLR user. I'm using the AST tree it produces to
> > create an interpreter for a small subset of the Java programming
> > language. I was looking at the Main.java file in the grammar 
examples
> > directory, and one of the last lines says:
> > '
> > 		JavaTreeParser tparse = new JavaTreeParser();
> > 		try
> > 			{
> > 			tparse.compilationUnit(t);
> > 			System.err.println("successful walk of result
> > AST for "+f);
> > 		}
> > 		catch (RecognitionException e) {
> > 			System.err.println(e.getMessage());
> > 			e.printStackTrace();
> > 		}
> > ' Could anyone tell me what this block does in the program, what 
is
> > a JavaTreeParser?
> > Thanks,
> > Jon
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to 
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
> --
> Co-founder, http://www.jguru.com
> Creator, ANTLR Parser Generator: http://www.antlr.org
> Co-founder, http://www.peerscope.com link sharing, pure-n-simple
> Lecturer in Comp. Sci., University of San Francisco


 

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