DOM Node Tree implementation in Crystal

dom.cr

module DOM
  module NodeType
    struct Text
      property string

      def initialize(@string : String)
      end
    end

    struct Element
      property tag_name, attributes

      def initialize(@tag_name : String, @attributes : Hash(String, String))
      end
    end
  end

  class Node
    @children : (Array(Node))?
    @node_type : (NodeType::Text | NodeType::Element)?

    def initialize(children, node_type)
      @children = children
      @node_type = node_type
    end

    def initialize
      @children = nil
      @node_type = nil
    end
  end

  def text(data : String) : Node
    Node.new children: [] of Node, node_type: NodeType::Text.new(data)
  end

  def element(name : String, attrs : Hash(String, String), children : Array(Node)) : Node
    element_node = NodeType::Element.new tag_name: name, attributes: attrs
    Node.new children: children, node_type: element_node
  end
end

include DOM

dom = element("p", {"id" => "something", "href" => "else"}, [text("hello")] of Node)
p dom