Hi Bill,
You have
import antlr.*;
instead of
import org.antlr.runtime.*;
Maybe that's the problem?
org.antlr.runtime.CommonToken implements org.antlr.runtime.Token, so
explicit casting seems out of wack.
Jay
Bill Andersen wrote:
> Thanks John
>
> Below is my class def.. Eclipse tells me the casts to Token below are
> required. Running a grammar that executes these constructors tells me I
> can't cast to Token.
>
> Here's a sample tree building expression where this class is used.
>
> ^(AS_TYPE_LIST<ASNode>[s.getType($ID.text)] ID)
>
> the getType method just looks up a ASType object by name from a table.
>
> import org.antlr.runtime.tree.*;
>
> import antlr.*;
>
> public class ASNode extends CommonTree {
>
> public ASType type = null;
>
> public ASNode() { }
>
> public ASNode(int ttype, ASType type) {
> token = (Token) new CommonToken(ttype,"");
> this.type = type;
> }
>
> public ASNode(int ttype) {
> token = (Token) new CommonToken(ttype,"");
> }
>
> @Override
> public String toString() {
> return (token!=null?token.getText():"")+"<ASNode>;"+type;
> }
>
> @Override
> public Tree dupNode() {
> ASNode n = new ASNode();
> n.token = token;
> n.type = type;
> return n;
> }
>
> }
>
> On Jul 19, 2010, at 15:15 , John B. Brodie wrote:
>
>> On Mon, 2010-07-19 at 14:29 -0400, Bill Andersen wrote:
>>> Hi folks
>> Greetings!
>>
>>> Having some trouble making ASTs using a custom node type. Before I ask any
>>> stupid questions, what is the best place to look on how to do this ( I'm
>>> using 3.2 )? I'm finding bits and pieces, some of them contradictory. For
>>> example I find this example
>>>
>>> static class V extends CommonTree {
>>> public int x,y,z;
>>> public V(int ttype, int x, int y, int z) {
>>> this.x=x; this.y=y; this.z=z; token=new CommonToken(ttype,"");
>>> }
>>> at http://www.antlr.org/wiki/display/ANTLR3/Tree+construction
>>>
>>> When I try to define a constructor like this I'm forced to put a cast
>>> between on CommonToken to Token, which causes a runtime can't cast error.
>>>
>>> What I want is really quite simple. Need to add one extra field to my AST
>>> nodes to carry DSL type information.
>>>
>>> Any help appreciated. Thanks.
>> Unable to reproduce.
>>
>> Attached please find a complete example derived from the grammar on the
>> above wiki page that uses the class V. maybe I'm using a different
>> example than yours?
>>
>> Need more info....
>> -jbb
>>
>> <T.g>
>
> Bill Andersen
> Highfleet, Inc. (www.highfleet.com)
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> Baltimore, MD 21224
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