[GROOVY-10190] DefaultErrorStrategy writes errors into std. err. output and this behaviour can not be overridden

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.8
• Component/s: parser-antlr4
• Assignee: Unassigned
• Reporter: Vojtěch Stránský
• Created: 04/Aug/21 13:47
• Updated: 04/Aug/21 13:47

Description

Problem descriptions:

When an unexpected error is caught by the Groovy parser then the error strategy reports the error message into standard error output.

 System.err.println("unknown recognition error type: " + e.getClass().getName());

But we want to handle this error in our way (not into terminal) but we can do nothing now.

public class DefaultErrorStrategy implements ANTLRErrorStrategy {

    public void reportError(Parser recognizer, RecognitionException e) {
        if (!this.inErrorRecoveryMode(recognizer)) {
            this.beginErrorCondition(recognizer);
            if (e instanceof NoViableAltException) {
                this.reportNoViableAlternative(recognizer, (NoViableAltException)e);
            } else if (e instanceof InputMismatchException) {
                this.reportInputMismatch(recognizer, (InputMismatchException)e);
            } else if (e instanceof FailedPredicateException) {
                this.reportFailedPredicate(recognizer, (FailedPredicateException)e);
            } else {
                System.err.println("unknown recognition error type: " + e.getClass().getName());
                this.notifyErrorListeners(recognizer, e.getMessage(), e);
            }
        }
    }
}

Expected result:

Remove writing into standard error output by deletion of this line:

System.err.println("unknown recognition error type: " + e.getClass().getName());

Or we would like to be able to change strategy or turn it off