Eliminate the document root context element.

src/parser/parser_context.rs

@@ -85,19 +85,6 @@ impl<'r, 's> ContextTree<'r, 's> {
         ))));
     }
 
-    pub fn get_document_root(&self) -> Option<&'s str> {
-        for current_node in self.iter() {
-            let context_element = current_node.get_data();
-            match context_element {
-                ContextElement::DocumentRoot(body) => {
-                    return Some(body);
-                }
-                _ => {}
-            }
-        }
-        None
-    }
-
     /// Indicates if elements should consume the whitespace after them.
     ///
     /// Defaults to true.
@@ -121,11 +108,6 @@ impl<'r, 's> ContextTree<'r, 's> {
 
 #[derive(Debug)]
 pub enum ContextElement<'r, 's> {
-    /// Stores a reference to the entire org-mode document being parsed.
-    ///
-    /// This is used for look-behind.
-    DocumentRoot(&'s str),
-
     /// Stores a parser that indicates that children should exit upon matching an exit matcher.
     ExitMatcherNode(ExitMatcherNode<'r>),
     Context(&'r str),