An custom value type for Fluid that allows for easy access of XML element content

people.xml

<people>
    <person>
        <name prefix="Mr">
            <first>Deane</first>
            <last>Barker</last>
        </name>
    </person>
    <person>
        <name prefix="Mrs">
            <first>Annie</first>
            <last>Barker</last>
        </name>
    </person>
</people>

results.txt

* Mr Deane Barker

* Mrs Annie Barker

template.liquid

{% for person in people._children %}
* {{ person.name._attrs.prefix }} {{ person.name.first._text }} {{ person.name.last._text }}
{% endfor %}

XmlValue.cs

public class XmlValue : FluidValue
{
  // The accessor to retrieve the text content of an element
  public static string TextAccessor { get; set; } = "_text";
  
  // The accessor to retrieve a dictionary of attributes of an element
  public static string AttributesAccessor { get; set; } = "_attrs";
  
  // The accessor to retrieve an array of the children of an element
  public static string ChildrenAccessor { get; set; } = "_children";
  
  private XElement _xml;

  public XmlValue(XElement xml)
  {
    _xml = xml;
  }

  public XmlValue(XDocument xml)
  {
    _xml = xml.Root;
  }

  protected override FluidValue GetValue(string name, TemplateContext context)
  {
    if (name == XmlValue.TextAccessor)
    {
      return StringValue.Create(ToStringValue());
    }

    if (name == AttributesAccessor)
    {
      return new DictionaryValue(new FluidValueDictionaryFluidIndexable(_xml.Attributes().ToDictionary(a => a.Name.ToString(), a => (FluidValue)StringValue.Create(a.Value))));
    }

    if (name == ChildrenAccessor)
    {
      return new ArrayValue(_xml.Elements().Select(e => new XmlValue(e)).ToArray());
    }

    var subElement = _xml.Element(name);
    return subElement != null
      ? new XmlValue(_xml.Element(name))
      : NilValue.Instance;
  }

  public override FluidValues Type => FluidValues.Object;
  public override bool Equals(FluidValue other) => false;
  public override bool ToBooleanValue() => false;
  public override decimal ToNumberValue() => 0;
  public override object ToObjectValue() => _xml;
  public override string ToStringValue() => _xml.Value;
  public override void WriteTo(TextWriter writer, TextEncoder encoder, CultureInfo cultureInfo) { }
}