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use uri::Uri;


/// Node representation.
#[derive(Clone, PartialEq, PartialOrd, Eq, Ord, Debug)]
pub enum Node {
  /// Node for representing a URI.
  UriNode { uri: Uri },

  /// Node for representing literals.
  LiteralNode {
    literal: String,
    data_type: Option<Uri>,
    language: Option<String>
  },

  /// Node for representing blanks.
  BlankNode { id: String }
}



#[cfg(test)]
mod tests {
  use node::*;

  #[test]
  fn access_literal_node() {
    let node = Node::LiteralNode {
      literal: "abcd".to_string(),
      data_type: None,
      language: None
    };

    match node {
      Node::LiteralNode { literal: lit, data_type: _, language: _ } =>
        assert_eq!(lit, "abcd".to_string()),
      _ => assert!(false)
    }
  }
}