Dart

Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

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Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

  final xml = CkXml();

  success = true;
  try {
    xml.loadXmlFile('qa_data/xml/fruit.xml');
  } on ChilkatException {
    success = false;
  }
  if (!success) {
    print(xml.lastErrorText);
    return;
  }

  // Iterate over the direct children by using FirstChild / NextSibling
  var child = xml.firstChild();
  var bContinue = xml.lastMethodSuccess;
  while (bContinue) {
    print('${child.tag} : ${child.content}');
    final nextSibling = child.nextSibling();
    bContinue = child.lastMethodSuccess;

    child = nextSibling;
  }

  print('-----');

  // Do the same, but with FirstChild2 / NextSibling2 to avoid
  // creating so many XML object instances:
  success = xml.firstChild2();
  while (success) {
    print('${xml.tag} : ${xml.content}');
    success = xml.nextSibling2();
  }

  // Revert back up to the parent:
  success = true;
  try {
    xml.getParent2();
  } on ChilkatException {
    success = false;
  }

  print('-----');

  // Iterate in reverse order using LastChild / PreviousSibling
  child = xml.lastChild();
  bContinue = xml.lastMethodSuccess;
  while (bContinue) {
    print('${child.tag} : ${child.content}');
    final prevSibling = child.previousSibling();
    bContinue = child.lastMethodSuccess;

    child = prevSibling;
  }

  print('-----');

  // Do the same, but with LastChild2 / PreviousSibling2 to avoid
  // creating so many XML object instances:
  success = true;
  try {
    xml.lastChild2();
  } on ChilkatException {
    success = false;
  }
  while (success) {
    print('${xml.tag} : ${xml.content}');
    success = true;
    try {
      xml.previousSibling2();
    } on ChilkatException {
      success = false;
    }
  }

  // Revert back up to the parent:
  success = true;
  try {
    xml.getParent2();
  } on ChilkatException {
    success = false;
  }
}