@Override
	public T visitChildren(RuleNode node) {
		T result = defaultResult();
		int n = node.getChildCount();
		for (int i=0; i<n; i++) {
			if (!shouldVisitNextChild(node, result)) {
				break;
			}

			ParseTree c = node.getChild(i);
			T childResult = c.accept(this);
			result = aggregateResult(result, childResult);
		}

		return result;
	}
{@inheritDoc}

<p>The default implementation initializes the aggregate result to
{@link #defaultResult defaultResult()}. Before visiting each child, it
calls {@link #shouldVisitNextChild shouldVisitNextChild}; if the result
is {@code false} no more children are visited and the current aggregate
result is returned. After visiting a child, the aggregate result is
updated by calling {@link #aggregateResult aggregateResult} with the
previous aggregate result and the result of visiting the child.</p>

<p>The default implementation is not safe for use in visitors that modify
the tree structure. Visitors that modify the tree should override this
method to behave properly in respect to the specific algorithm in use.</p>
runtime/Java/src/org/antlr/v4/runtime/tree/AbstractParseTreeVisitor.java