Implement parser for the simplest form of footnote reference.

src/parser/footnote_reference.rs

@@ -9,6 +9,7 @@ use super::Context;
 use crate::error::CustomError;
 use crate::error::MyError;
 use crate::error::Res;
+use crate::parser::footnote_definition::label;
 use crate::parser::object_parser::standard_set_object;
 use crate::parser::parser_context::FootnoteReferenceDefinition;
 use crate::parser::parser_with_context::parser_with_context;
@@ -27,7 +28,7 @@ pub fn footnote_reference<'r, 's>(
 }
 
 #[tracing::instrument(ret, level = "debug")]
-pub fn anonymous_footnote<'r, 's>(
+fn anonymous_footnote<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, FootnoteReference<'s>> {
@@ -57,6 +58,34 @@ pub fn anonymous_footnote<'r, 's>(
     ))
 }
 
+#[tracing::instrument(ret, level = "debug")]
+fn inline_footnote<'r, 's>(
+    context: Context<'r, 's>,
+    input: &'s str,
+) -> Res<&'s str, FootnoteReference<'s>> {
+    not_yet_implemented()?;
+    todo!()
+}
+
+#[tracing::instrument(ret, level = "debug")]
+fn footnote_reference_only<'r, 's>(
+    context: Context<'r, 's>,
+    input: &'s str,
+) -> Res<&'s str, FootnoteReference<'s>> {
+    let (remaining, _) = tag_no_case("[fn:")(input)?;
+    let (remaining, label_contents) = label(remaining)?;
+    let (remaining, _) = tag("]")(remaining)?;
+    let source = get_consumed(input, remaining);
+    Ok((
+        remaining,
+        FootnoteReference {
+            source,
+            label: Some(label_contents),
+            definition: Vec::with_capacity(0),
+        },
+    ))
+}
+
 #[tracing::instrument(ret, level = "debug")]
 fn definition<'s>(input: &'s str) -> Res<&'s str, Vec<Object<'s>>> {
     Ok((input, vec![]))