persistence.antlr.debug.Tracer Maven / Gradle / Ivy
package persistence.antlr.debug;
public class Tracer extends TraceAdapter implements TraceListener {
String indent=""; // TBD: should be StringBuffer
protected void dedent() {
if (indent.length() < 2)
indent = "";
else
indent = indent.substring(2);
}
public void enterRule(TraceEvent e) {
System.out.println(indent+e);
indent();
}
public void exitRule(TraceEvent e) {
dedent();
System.out.println(indent+e);
}
protected void indent() {
indent += " ";
}
}