Starting to separate the context and parsed tokens into their own modules.

src/context/parser_with_context.rs

@@ -0,0 +1,6 @@
+macro_rules! parser_with_context {
+    ($target:expr) => {
+        move |context| move |i| $target(context, i)
+    };
+}
+pub(crate) use parser_with_context;