How to use

SourceElement

in

com.oracle.truffle.api.debug

private static Set<Class<? extends Tag>> getElementTags(SourceElement[] sourceElements) {
  if (sourceElements.length == 1) {
    return Collections.singleton(sourceElements[0].getTag());
  }
  Set<Class<? extends Tag>> elementTags = new HashSet<>();
  for (int i = 0; i < sourceElements.length; i++) {
    elementTags.add(sourceElements[i].getTag());
  }
  return elementTags;
}

private static boolean preferredAnchorMatches(SourceElement element, SuspendAnchor anchor) {
  switch (element) {
    case STATEMENT:
      return SuspendAnchor.BEFORE == anchor;
    case EXPRESSION:
      return true;
    default:
      throw new IllegalStateException(element.name());
  }
}

private static Set<Class<? extends Tag>> getElementTags(SourceElement[] sourceElements) {
  if (sourceElements.length == 1) {
    return Collections.singleton(sourceElements[0].getTag());
  }
  Set<Class<? extends Tag>> elementTags = new HashSet<>();
  for (int i = 0; i < sourceElements.length; i++) {
    elementTags.add(sourceElements[i].getTag());
  }
  return elementTags;
}

@Override
void notifyNodeEntry(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    exprCounter++;
    activeExpression = exprCounter <= 0;
  }
}

/**
 * Returns <code>true</code> if the underlying guest language source location is denoted as the
 * source element.
 *
 * @param sourceElement the source element to check, must not be <code>null</code>.
 * @since 0.33
 */
public boolean hasSourceElement(SourceElement sourceElement) {
  return context.hasTag(sourceElement.getTag());
}

/**
 * Returns <code>true</code> if the underlying guest language source location is denoted as the
 * source element.
 *
 * @param sourceElement the source element to check, must not be <code>null</code>.
 * @since 0.33
 */
public boolean hasSourceElement(SourceElement sourceElement) {
  return context.hasTag(sourceElement.getTag());
}

@Override
void notifyNodeExit(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    boolean isOn = (--exprCounter) < 0;
    if (isOn) {
      activeExpression = true;
    }
  }
}

@Override
void notifyNodeEntry(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    exprCounter++;
    activeExpression = false;
  }
}

@Override
void initialize(SuspendedContext context, SuspendAnchor suspendAnchor) {
  this.stackCounter = 0;
  this.exprCounter = context.hasTag(SourceElement.EXPRESSION.getTag()) && SuspendAnchor.BEFORE == suspendAnchor ? 0 : -1;
}

@Override
void initialize(SuspendedContext context, SuspendAnchor suspendAnchor) {
  this.stackCounter = 0;
  this.exprCounter = context.hasTag(SourceElement.EXPRESSION.getTag()) && SuspendAnchor.BEFORE == suspendAnchor ? 0 : -1;
}

private static void setTags(SourceSectionFilter.Builder f, SourceElement[] sourceElements) {
  Class<?>[] elementTags = new Class<?>[sourceElements.length];
  for (int i = 0; i < elementTags.length; i++) {
    elementTags[i] = sourceElements[i].getTag();
  }
  f.tagIs(elementTags);
}

@Override
void notifyNodeExit(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    boolean isOn = (--exprCounter) < 0;
    if (isOn) {
      activeExpression = true;
    }
  }
}

@Override
void notifyNodeExit(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    boolean isOn = (--exprCounter) < 0;
    if (isOn) {
      activeExpression = true;
    }
  }
}

@Override
void notifyNodeEntry(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    exprCounter++;
    activeExpression = exprCounter <= 0;
  }
}

@Override
void notifyNodeEntry(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    exprCounter++;
    activeExpression = false;
  }
}

@Override
void notifyNodeExit(EventContext context) {
  if (exprStepping && context.hasTag(SourceElement.EXPRESSION.getTag())) {
    boolean isOn = (--exprCounter) < 0;
    if (isOn) {
      activeExpression = true;
    }
  }
}

boolean matches(DebuggerSession session, EventContext context, SuspendAnchor anchor) {
  Set<SourceElement> elements = sourceElements;
  if (elements == null) {
    elements = session.getSourceElements();
  }
  for (SourceElement se : elements) {
    if (context.hasTag(se.getTag()) && preferredAnchors.get(se).contains(anchor)) {
      return true;
    }
  }
  return false;
}

private void addBindings(boolean includeInternalCode, Predicate<Source> sFilter) {
  if (syntaxElementsBinding == null && !sourceElements.isEmpty()) {
    Class<?>[] syntaxTags = new Class<?>[this.sourceElements.size() + (hasRootElement ? 0 : 1)];
    Iterator<SourceElement> elementsIterator = this.sourceElements.iterator();
    int i = 0;
    while (elementsIterator.hasNext()) {
      syntaxTags[i++] = elementsIterator.next().getTag();
    }
    assert i == sourceElements.size();
    if (!hasRootElement) {
      syntaxTags[i] = RootTag.class;
    }
    this.syntaxElementsBinding = createBinding(includeInternalCode, sFilter, new ExecutionEventNodeFactory() {
      @Override
      public ExecutionEventNode create(EventContext context) {
        if (context.hasTag(RootTag.class)) {
          return new RootSteppingDepthNode(context);
        } else {
          return new SteppingNode(context);
        }
      }
    }, hasExpressionElement, syntaxTags);
    allBindings.add(syntaxElementsBinding);
  }
}

@Override
boolean step(DebuggerSession steppingSession, EventContext context, SuspendAnchor suspendAnchor) {
  if (stepConfig.matches(session, context, suspendAnchor) ||
          SuspendAnchor.AFTER == suspendAnchor && (stackCounter < 0 || exprCounter < 0)) {
    stackCounter = 0;
    exprCounter = context.hasTag(SourceElement.EXPRESSION.getTag()) && SuspendAnchor.BEFORE == suspendAnchor ? 0 : -1;
    return --unfinishedStepCount <= 0;
  } else {
    return false;
  }
}

@Override
boolean step(DebuggerSession steppingSession, EventContext context, SuspendAnchor suspendAnchor) {
  if (stepConfig.matches(session, context, suspendAnchor) ||
          SuspendAnchor.AFTER == suspendAnchor && (stackCounter < 0 || exprCounter < 0)) {
    stackCounter = 0;
    exprCounter = context.hasTag(SourceElement.EXPRESSION.getTag()) && SuspendAnchor.BEFORE == suspendAnchor ? 0 : -1;
    return --unfinishedStepCount <= 0;
  } else {
    return false;
  }
}