Move the list to its own file.

src/parser/list.rs

@@ -0,0 +1,29 @@
+use std::rc::Rc;
+
+pub struct List<T> {
+    head: Option<Rc<Node<T>>>,
+}
+
+pub struct Node<T> {
+    data: T,
+    parent: Option<Rc<Node<T>>>,
+}
+
+impl<T> List<T> {
+    pub fn new() -> Self {
+        List { head: None }
+    }
+
+    pub fn push_front(&self, data: T) -> List<T> {
+        List {
+            head: Some(Rc::new(Node {
+                data: data,
+                parent: self.head.clone(),
+            })),
+        }
+    }
+
+    pub fn get_data(&self) -> &T {
+        &self.data
+    }
+}

src/parser/mod.rs

@@ -1,3 +1,4 @@
+mod list;
 mod new_context;
 mod nom_context;
 mod parser_with_context;

src/parser/new_context.rs

@@ -1,8 +1 @@
-pub struct List<T> {
-    head: Option<Rc<Node<T>>>,
-}
 
-pub struct Node<T> {
-    data: T,
-    parent: Option<Rc<Node<T>>>,
-}