Create structure for footnote references.

src/parser/footnote_reference.rs

@@ -0,0 +1,13 @@
+use super::Context;
+use crate::error::Res;
+use crate::parser::FootnoteReference;
+use crate::parser::util::not_yet_implemented;
+
+#[tracing::instrument(ret, level = "debug")]
+pub fn footnote_reference<'r, 's>(
+    context: Context<'r, 's>,
+    input: &'s str,
+) -> Res<&'s str, FootnoteReference<'s>> {
+    not_yet_implemented()?;
+    todo!()
+}

src/parser/mod.rs

@@ -12,6 +12,7 @@ mod exiting;
 mod export_snippet;
 mod fixed_width_area;
 mod footnote_definition;
+mod footnote_reference;
 mod greater_block;
 mod greater_element;
 mod horizontal_rule;
@@ -75,6 +76,7 @@ pub use object::Bold;
 pub use object::Code;
 pub use object::Entity;
 pub use object::ExportSnippet;
+pub use object::FootnoteReference;
 pub use object::Italic;
 pub use object::LatexFragment;
 pub use object::Object;

src/parser/object.rs

@@ -18,6 +18,7 @@ pub enum Object<'s> {
     Entity(Entity<'s>),
     LatexFragment(LatexFragment<'s>),
     ExportSnippet(ExportSnippet<'s>),
+    FootnoteReference(FootnoteReference<'s>),
 }
 
 #[derive(Debug, PartialEq)]
@@ -117,6 +118,13 @@ pub struct ExportSnippet<'s> {
     pub contents: Option<&'s str>,
 }
 
+#[derive(Debug, PartialEq)]
+pub struct FootnoteReference<'s> {
+    pub source: &'s str,
+    pub label: &'s str,
+    pub definition: Vec<Object<'s>>,
+}
+
 impl<'s> Source<'s> for Object<'s> {
     fn get_source(&'s self) -> &'s str {
         match self {
@@ -136,6 +144,7 @@ impl<'s> Source<'s> for Object<'s> {
             Object::Entity(obj) => obj.source,
             Object::LatexFragment(obj) => obj.source,
             Object::ExportSnippet(obj) => obj.source,
+            Object::FootnoteReference(obj) => obj.source,
         }
     }
 }
@@ -229,3 +238,9 @@ impl<'s> Source<'s> for ExportSnippet<'s> {
         self.source
     }
 }
+
+impl<'s> Source<'s> for FootnoteReference<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}

src/parser/object_parser.rs

@@ -10,6 +10,7 @@ use crate::error::Res;
 use crate::parser::angle_link::angle_link;
 use crate::parser::entity::entity;
 use crate::parser::export_snippet::export_snippet;
+use crate::parser::footnote_reference::footnote_reference;
 use crate::parser::latex_fragment::latex_fragment;
 use crate::parser::object::Object;
 use crate::parser::org_macro::org_macro;
@@ -23,10 +24,14 @@ pub fn standard_set_object<'r, 's>(
     context: Context<'r, 's>,
     input: &'s str,
 ) -> Res<&'s str, Object<'s>> {
-    // TODO: footnote references, citations (NOT citation references), inline babel calls, inline source blocks, line breaks, links, macros, targets and radio targets, statistics cookies, subscript and superscript, timestamps, and text markup.
+    // TODO: citations (NOT citation references), inline babel calls, inline source blocks, line breaks, links, macros, targets and radio targets, statistics cookies, subscript and superscript, timestamps, and text markup.
     not(|i| context.check_exit_matcher(i))(input)?;
 
     alt((
+        map(
+            parser_with_context!(footnote_reference)(context),
+            Object::FootnoteReference,
+        ),
         map(
             parser_with_context!(export_snippet)(context),
             Object::ExportSnippet,
@@ -79,6 +84,10 @@ pub fn any_object_except_plain_text<'r, 's>(
 ) -> Res<&'s str, Object<'s>> {
     // Used for exit matchers so this does not check exit matcher condition.
     alt((
+        map(
+            parser_with_context!(footnote_reference)(context),
+            Object::FootnoteReference,
+        ),
         map(
             parser_with_context!(export_snippet)(context),
             Object::ExportSnippet,

src/parser/token.rs

@@ -55,6 +55,9 @@ impl<'r, 's> Token<'r, 's> {
                 Object::Entity(_) => Box::new(std::iter::empty()),
                 Object::LatexFragment(_) => Box::new(std::iter::empty()),
                 Object::ExportSnippet(_) => Box::new(std::iter::empty()),
+                Object::FootnoteReference(inner) => {
+                    Box::new(inner.definition.iter().map(Token::Object))
+                }
             },
             Token::Element(elem) => match elem {
                 Element::Paragraph(inner) => Box::new(inner.children.iter().map(Token::Object)),