Added traits for nodes and context elements.

src/parser/new_context.rs

@@ -8,3 +8,47 @@
 //     };
 //     let child2 = child1.with_additional_node(&child2_context);
 // }
+
+use nom::error::VerboseError;
+use nom::IResult;
+
+type Matcher = dyn for<'s> Fn(&'s str) -> IResult<&'s str, &'s str, VerboseError<&'s str>>;
+type Link<'p> = Option<&'p dyn NodeType<'p>>;
+
+struct Node<'p, T> {
+    data: T,
+    parent: Link<'p>,
+}
+
+pub trait NodeType<'p> {
+    fn get_data(&self) -> &dyn ContextElement;
+    fn get_parent(&self) -> Link<'p>;
+}
+
+impl<'p, T> NodeType<'p> for Node<'p, T>
+where
+    T: ContextElement,
+{
+    fn get_data(&self) -> &dyn ContextElement {
+        &self.data
+    }
+
+    fn get_parent(&self) -> Link<'p> {
+        self.parent
+    }
+}
+
+pub trait ContextElement {}
+
+struct FailMatcherNode<'r> {
+    fail_matcher: ChainBehavior<'r>,
+}
+
+struct PreviousElementNode<'r> {
+    dummy: &'r str,
+}
+
+enum ChainBehavior<'r> {
+    AndParent(Option<&'r Matcher>),
+    IgnoreParent(Option<&'r Matcher>),
+}