Make the item tag exit matcher a lower class than all all others.

This is to allow for " :: " inside a description list item's tag if it is nested inside another object.

src/context/context.rs

@@ -108,7 +108,7 @@ impl<'g, 'r, 's> Context<'g, 'r, 's> {
         &'r self,
         i: OrgSource<'s>,
     ) -> IResult<OrgSource<'s>, OrgSource<'s>, CustomError<OrgSource<'s>>> {
-        let mut current_class_filter = ExitClass::Gamma;
+        let mut current_class_filter = ExitClass::Delta;
         for current_node in self.iter_context() {
             let context_element = current_node.get_data();
             match context_element {

src/context/exiting.rs

@@ -1,16 +1,10 @@
 #[derive(Debug, Copy, Clone)]
 pub enum ExitClass {
-    /// Headlines and sections.
     Document = 1,
-
-    /// Elements who take priority over beta elements when matching.
-    Alpha = 20,
-
-    /// Elements who cede priority to alpha elements when matching.
-    Beta = 300,
-
-    /// Elements who cede priority to alpha and beta elements when matching.
-    Gamma = 4000,
+    Alpha = 2,
+    Beta = 3,
+    Gamma = 4,
+    Delta = 5,
 }
 
 impl std::fmt::Display for ExitClass {

src/parser/plain_list.rs

@@ -152,11 +152,8 @@ pub fn plain_list_item<'b, 'g, 'r, 's>(
 
     // TODO: parse checkbox
 
-    let (remaining, maybe_tag) = opt(tuple((
-        space1,
-        parser_with_context!(item_tag)(context),
-        tag(" ::"),
-    )))(remaining)?;
+    let (remaining, maybe_tag) =
+        opt(tuple((space1, parser_with_context!(item_tag)(context))))(remaining)?;
     let maybe_contentless_item: Res<OrgSource<'_>, OrgSource<'_>> =
         peek(recognize(tuple((many0(blank_line), eof))))(remaining);
     match maybe_contentless_item {
@@ -170,7 +167,7 @@ pub fn plain_list_item<'b, 'g, 'r, 's>(
                     indentation: indent_level,
                     bullet: bull.into(),
                     tag: maybe_tag
-                        .map(|(_ws, item_tag, _divider)| item_tag)
+                        .map(|(_ws, item_tag)| item_tag)
                         .unwrap_or(Vec::new()),
                     children: Vec::new(),
                 },
@@ -219,7 +216,7 @@ pub fn plain_list_item<'b, 'g, 'r, 's>(
             indentation: indent_level,
             bullet: bull.into(),
             tag: maybe_tag
-                .map(|(_ws, item_tag, _divider)| item_tag)
+                .map(|(_ws, item_tag)| item_tag)
                 .unwrap_or(Vec::new()),
             children: children.into_iter().map(|(_start, item)| item).collect(),
         },
@@ -313,11 +310,18 @@ fn item_tag<'b, 'g, 'r, 's>(
     context: RefContext<'b, 'g, 'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, Vec<Object<'s>>> {
-    let parser_context = ContextElement::ExitMatcherNode(ExitMatcherNode {
-        class: ExitClass::Gamma,
-        exit_matcher: &item_tag_end,
-    });
-    let parser_context = context.with_additional_node(&parser_context);
+    let contexts = [
+        ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Gamma,
+            exit_matcher: &item_tag_line_ending_end,
+        }),
+        ContextElement::ExitMatcherNode(ExitMatcherNode {
+            class: ExitClass::Delta,
+            exit_matcher: &item_tag_end,
+        }),
+    ];
+    let parser_context = context.with_additional_node(&contexts[0]);
+    let parser_context = parser_context.with_additional_node(&contexts[1]);
     let (remaining, (children, _exit_contents)) = verify(
         many_till(
             // TODO: Should this be using a different set like the minimal set?
@@ -326,6 +330,7 @@ fn item_tag<'b, 'g, 'r, 's>(
         ),
         |(children, _exit_contents)| !children.is_empty(),
     )(input)?;
+    let (remaining, _) = tag(" ::")(remaining)?;
     Ok((remaining, children))
 }
 
@@ -335,12 +340,19 @@ fn item_tag_end<'b, 'g, 'r, 's>(
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
     recognize(alt((
-        line_ending,
         tag(" :: "),
         recognize(tuple((tag(" ::"), alt((line_ending, eof))))),
     )))(input)
 }
 
+#[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
+fn item_tag_line_ending_end<'b, 'g, 'r, 's>(
+    _context: RefContext<'b, 'g, 'r, 's>,
+    input: OrgSource<'s>,
+) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    line_ending(input)
+}
+
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 fn item_tag_post_gap<'b, 'g, 'r, 's>(
     context: RefContext<'b, 'g, 'r, 's>,