From d2923bfc0f37e8985371c51ca024f0e2295ce5d3 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Sat, 25 Mar 2023 14:45:35 -0400
Subject: [PATCH] Add a special case exit matcher for end of file.

---
 src/parser/parser_context.rs |  7 +++++++
 src/parser/plain_list.rs     | 12 ++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/parser/parser_context.rs b/src/parser/parser_context.rs
index e0cc0ef..8f4ac3a 100644
--- a/src/parser/parser_context.rs
+++ b/src/parser/parser_context.rs
@@ -1,5 +1,6 @@
 use std::rc::Rc;
 
+use nom::combinator::eof;
 use nom::IResult;
 
 use super::error::CustomError;
@@ -57,6 +58,12 @@ impl<'r, 's> ContextTree<'r, 's> {
         &'r self,
         i: &'s str,
     ) -> IResult<&'s str, &'s str, CustomError<&'s str>> {
+        // Special check for EOF. We don't just make this a document-level exit matcher since the IgnoreParent ChainBehavior could cause early exit matchers to not run.
+        let at_end_of_file = eof(i);
+        if at_end_of_file.is_ok() {
+            return at_end_of_file;
+        }
+
         for current_node in self.iter() {
             let context_element = current_node.get_data();
             match context_element {
diff --git a/src/parser/plain_list.rs b/src/parser/plain_list.rs
index d3177c6..805e3c5 100644
--- a/src/parser/plain_list.rs
+++ b/src/parser/plain_list.rs
@@ -131,4 +131,16 @@ mod tests {
         assert_eq!(remaining, "");
         assert_eq!(result.source, "1.");
     }
+
+    #[test]
+    fn plain_list_item_simple() {
+        let input = "1. foo";
+        let initial_context: ContextTree<'_, '_> = ContextTree::new();
+        let document_context =
+            initial_context.with_additional_node(ContextElement::DocumentRoot(input));
+        let plain_list_item_matcher = parser_with_context!(plain_list_item)(&document_context);
+        let (remaining, result) = plain_list_item_matcher(input).unwrap();
+        assert_eq!(remaining, "");
+        assert_eq!(result.source, "1. foo");
+    }
 }