According to the antlr4 book (page 159), and using the grammar Ambig.g4, grammar ambiguity can be reported by:
grun Ambig stat -diagnostics
or equivalently, in code form:
parser.removeErrorListeners();
parser.addErrorListener(new DiagnosticErrorListener());
parser.getInterpreter().setPredictionMode(PredictionMode.LL_EXACT_AMBIG_DETECTION);
The grun command reports the ambiguity properly for me, using antlr-4.5.3. But when I use the code form, I dont get the ambiguity report. Here is the command trace:
$ antlr4 Ambig.g4 # see the book's page.159 for the grammar
$ javac Ambig*.java
$ grun Ambig stat -diagnostics < in1.txt # in1.txt is as shown on page.159
line 1:3 reportAttemptingFullContext d=0 (stat), input='f();'
line 1:3 reportAmbiguity d=0 (stat): ambigAlts={1, 2}, input='f();'
$ javac TestA_Listener.java
$ java TestA_Listener < in1.txt # exits silently
The TestA_Listener.java code is the following:
import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.atn.*; // for PredictionMode
import java.util.*;
public class TestA_Listener {
public static void main(String[] args) throws Exception {
ANTLRInputStream input = new ANTLRInputStream(System.in);
AmbigLexer lexer = new AmbigLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
AmbigParser parser = new AmbigParser(tokens);
parser.removeErrorListeners(); // remove ConsoleErrorListener
parser.addErrorListener(new DiagnosticErrorListener());
parser.getInterpreter().setPredictionMode(PredictionMode.LL_EXACT_AMBIG_DETECTION);
parser.stat();
}
}