writeXml method

@override Future<Result<void, OutputError>> writeXml(XmlDocument document)

Writes an XML document to the destination.

Implementation

@override
Future<Result<void, OutputError>> writeXml(XmlDocument document) async {
  try {
    final file = File(filePath);

    // Check parent directory exists
    final parent = file.parent;
    if (!await parent.exists()) {
      await parent.create(recursive: true);
    }

    // Convert document to pretty-printed string
    // Pretty-print the whole document, but preserve whitespace (disable pretty) only inside <system-out> elements.
    // The preserveWhitespace callback returns true for <system-out> tags, so their contents are not reformatted.
    final xmlString = document.toXmlString(
      pretty: true,
      indent: '  ',
      preserveWhitespace: (node) =>
          node is XmlElement && node.name.local == 'system-out' ||
          node is XmlElement && node.name.local == 'failure',
    );

    // Write to file with UTF-8 encoding
    try {
      await file.writeAsString(xmlString, encoding: utf8);
      return const Success(null);
    } on FileSystemException catch (e) {
      if (e.osError?.errorCode == 13) {
        // Permission denied
        return Failure(PermissionError(filePath));
      }
      return Failure(FileWriteError(filePath, e.message));
    } catch (e) {
      return Failure(FileWriteError(filePath, e.toString()));
    }
  } catch (e) {
    return Failure(
      FileWriteError(filePath, 'Unexpected error: ${e.toString()}'),
    );
  }
}