[antlr-interest] CommonTreeNodeStream.size() get "streams are ofunknown size" exception

[Sam Harwell]

You need to switch to use the new BufferedTreeNodeStream class instead.
The new CommonTreeNodeStream is unbuffered, so it can't know the size.

Sam

-----Original Message-----
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Shaoting Cai
Sent: Monday, March 23, 2009 5:52 PM
To: ANTLR Interest
Subject: [antlr-interest] CommonTreeNodeStream.size() get "streams are
ofunknown size" exception

Hi,

I was using CommonTreeNodeStream.size() and it worked in antlr-3.1.1.
After I switch to 3.1.3, I get "streams are of unknown size" runtime
exception.
Is there any changes in the CommonTreeNodeStream class?

here's how I create the CommonTreeNodeStream:

        ....
        this.ast = (CommonTree) r.getTree();
        System.out.println(ast.toStringTree());  // <-- i can see the
tree string
        CommonTreeNodeStream nodes = new CommonTreeNodeStream(ast);
        System.out.println(nodes.size());  // <-- get exception here
        ....

Thanks in advance for any clue :)

Shaoting

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