Subrules vist listener

[paul.l...@gmail.com]

Hi everybody!

I have some problem with traversing the AST, produced by ANTLR. I Have some grammar like

{{{

definition : classType Identifier ('=' expression)?
| classType classMethod;

get : (KW_GET definition (from)? (where)?)
| (KW_GET aggregation '(' definition ')' (from)? (where)?)
| (aggregation '(' KW_GET definition (from)? (where)?')');

}}}

The point is that visitor finds the second level definitions, but doesn't visit sub definitions in the get rule.

{{{
public class DefinitionVisitor extends SMLGrammarBaseListener {

@Override
public void exitDefinition(DefinitionContext ctx) {
String id = ctx.Identifier().getText();
String type = ctx.classType().getText();
}
}}}

Tree from TestRig is fine.

Thanks for your help!

[paul.l...@gmail.com]

Is it possible to get different trees using TestRig and API of ANTLR?


вторник, 9 апреля 2013 г., 12:43:59 UTC+4 пользователь paul.l...@gmail.com написал:

[Sam Harwell]

Hi Paul,

You should really call your class DefinitionListener, since ANTLR 4 produces both listener and visitor interfaces and you are using the listener interface.

The following will result in DefinitionListener.exitDefinition() being called for every DefinitionContext in the parse tree.

DefinitionContext definition = parser.definition();
DefinitionListener listener = new DefinitionListener();
ParseTreeWalker.DEFAULT.walk(listener, tree)

--
Sam Harwell
Owner, Lead Developer
http://tunnelvisionlabs.com

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[paul.l...@gmail.com]

Thank you for your help! Could you tell me, is it possible to get different trees using TestRig and API of ANTLR?

[Sam Harwell]

Can you give an example of what you're looking for?

Thank you,