forked from jasder/antlr
62 lines
1.9 KiB
Java
62 lines
1.9 KiB
Java
import org.antlr.v4.runtime.BailErrorStrategy;
|
|
import org.antlr.v4.runtime.CharStream;
|
|
import org.antlr.v4.runtime.CommonTokenFactory;
|
|
import org.antlr.v4.runtime.CommonTokenStream;
|
|
import org.antlr.v4.runtime.ConsoleErrorListener;
|
|
import org.antlr.v4.runtime.DefaultErrorStrategy;
|
|
import org.antlr.v4.runtime.DiagnosticErrorListener;
|
|
import org.antlr.v4.runtime.ParserRuleContext;
|
|
import org.antlr.v4.runtime.RecognitionException;
|
|
import org.antlr.v4.runtime.UnbufferedCharStream;
|
|
|
|
import java.io.FileInputStream;
|
|
import java.io.InputStream;
|
|
|
|
public class TestT {
|
|
public static void main(String[] args) throws Exception {
|
|
String inputFile = null;
|
|
if ( args.length>0 ) inputFile = args[0];
|
|
InputStream is = System.in;
|
|
if ( inputFile!=null ) {
|
|
is = new FileInputStream(inputFile);
|
|
}
|
|
CharStream input = new UnbufferedCharStream(is);
|
|
|
|
TLexer lex = new TLexer(input);
|
|
lex.setTokenFactory(new CommonTokenFactory(true));
|
|
|
|
CommonTokenStream tokens = new CommonTokenStream(lex);
|
|
TParser parser = new TParser(tokens);
|
|
|
|
parser.addErrorListener(new DiagnosticErrorListener());
|
|
|
|
ParserRuleContext tree = null;
|
|
parser.getInterpreter().setSLL(true); // try with just SLL(*)
|
|
// no errors messages or recovery wanted during first try
|
|
parser.removeErrorListeners();
|
|
parser.setErrorHandler(new BailErrorStrategy());
|
|
try {
|
|
tree = parser.s();
|
|
}
|
|
catch (RuntimeException ex) {
|
|
if (ex.getClass() == RuntimeException.class &&
|
|
ex.getCause() instanceof RecognitionException)
|
|
{
|
|
System.out.println("trying with LL(*)");
|
|
tokens.reset(); // rewind
|
|
// back to standard listeners/handlers
|
|
parser.addErrorListener(ConsoleErrorListener.INSTANCE);
|
|
parser.setErrorHandler(new DefaultErrorStrategy());
|
|
parser.getInterpreter().setSLL(false); // try full LL(*)
|
|
tree = parser.s();
|
|
}
|
|
}
|
|
|
|
// parser.getInterpreter().setSLL(true);
|
|
// parser.setTrace(true);
|
|
|
|
System.out.println(tree.toStringTree(parser));
|
|
// tree.save(parser, "/tmp/t.ps");
|
|
}
|
|
}
|