Greetings!
On 11/11/2011 03:00 AM, D. Frej wrote:
> The grammar is rather stupid and simple
... snipped ...
> It is executed with the following Java code
>
> ANTLRStringStream input = new ANTLRStringStream("15 / 7.25 +4");
> ExpressionLexer lex = new ExpressionLexer(input);
> CommonTokenStream tokens = new CommonTokenStream(lex);
>
> ExpressionParser g = new ExpressionParser(tokens); //, 49100, null);
> try {
> ExpressionParser.content_return r = g.content();
>
> CommonTree ctree = (CommonTree) r.getTree();
> System.out.println("ctree.type|" + ctree.getType() + "|" +
> ExpressionParser.tokenNames[ctree.getType()] + "|");
> } catch (RecognitionException e) {
> e.printStackTrace();
> }
>
> Yet here the input of "15 / 7.25 +4" does not work. Eclipse outputs
> "ctree.type|0|<invalid>|".
it actually does parse correctly. you are not printing the result
properly. the result of the parse is a tree and yet you try to print it
as if it were a token.
use ctree.toStringTree() in your println instead.
> When I use simply "15" as input, I get the -
> correct - output "ctree.type|7|INT|".
>
because the tree in this case is simply a single token.
i do not use ANTLRWorks so can not speak to your experiences with that tool.
hope this helps...
-jbb
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