[antlr-interest] Re: Heterogeneous AST - simple calculator parser
Sinan
sinan.karasu at boeing.com
Wed Feb 13 12:45:03 PST 2002
koud0002 wrote:
>
> Thanks for your reply.
>
> The AST is now constructed correctly.
> However, I am now getting "unexpected end of subtree"
> NoViableAltException from the treewalker.
> The treewalker still does not recognize UNARY_MINUS.
>
> I would still like to use the custom AST.
> What am I doing wrong? Thanks
>
> Robert
>
If you look in the examples directory for 'tinybasic'
You will see a piece of code in Main.java that reads like
if ( showTree ) {
((CommonAST)t).setVerboseStringConversion(true, tokenNames);
ASTFactory factory = new ASTFactory();
AST r = factory.create(0,"AST ROOT");
r.setFirstChild(t);
ASTFrame frame = new ASTFrame("TinyBasic AST", r);
frame.setVisible(true);
//System.out.println(t.toStringList());
}
Where showTree is set by -showtree option.
This will give you the complete Parse Tree.
However to make it work you have to do
find antlr -name "*.class" -exec rm {} \;
javac `find antlr -name "*.java" -print`
jar cvf antlrall.jar `find antlr -name "*.class" -print`
to get everything into the antlrall.jar ( The debug classes )
That is how I debug the TreeWalker....
Sinan
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