Create structure for citations.

src/parser/citation.rs

@@ -0,0 +1,10 @@
+use super::Context;
+use crate::error::Res;
+use crate::parser::object::Citation;
+use crate::parser::util::not_yet_implemented;
+
+#[tracing::instrument(ret, level = "debug")]
+pub fn citation<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Citation<'s>> {
+    not_yet_implemented()?;
+    todo!()
+}

src/parser/citation_reference.rs

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

src/parser/mod.rs

@@ -1,4 +1,6 @@
 mod angle_link;
+mod citation;
+mod citation_reference;
 mod clock;
 mod comment;
 mod diary_sexp;
@@ -73,6 +75,8 @@ pub use lesser_element::TableCell;
 pub use lesser_element::VerseBlock;
 pub use object::AngleLink;
 pub use object::Bold;
+pub use object::Citation;
+pub use object::CitationReference;
 pub use object::Code;
 pub use object::Entity;
 pub use object::ExportSnippet;

src/parser/object.rs

@@ -19,6 +19,8 @@ pub enum Object<'s> {
     LatexFragment(LatexFragment<'s>),
     ExportSnippet(ExportSnippet<'s>),
     FootnoteReference(FootnoteReference<'s>),
+    Citation(Citation<'s>),
+    CitationReference(CitationReference<'s>),
 }
 
 #[derive(Debug, PartialEq)]
@@ -125,6 +127,16 @@ pub struct FootnoteReference<'s> {
     pub definition: Vec<Object<'s>>,
 }
 
+#[derive(Debug, PartialEq)]
+pub struct Citation<'s> {
+    pub source: &'s str,
+}
+
+#[derive(Debug, PartialEq)]
+pub struct CitationReference<'s> {
+    pub source: &'s str,
+}
+
 impl<'s> Source<'s> for Object<'s> {
     fn get_source(&'s self) -> &'s str {
         match self {
@@ -145,6 +157,8 @@ impl<'s> Source<'s> for Object<'s> {
             Object::LatexFragment(obj) => obj.source,
             Object::ExportSnippet(obj) => obj.source,
             Object::FootnoteReference(obj) => obj.source,
+            Object::Citation(obj) => obj.source,
+            Object::CitationReference(obj) => obj.source,
         }
     }
 }
@@ -244,3 +258,15 @@ impl<'s> Source<'s> for FootnoteReference<'s> {
         self.source
     }
 }
+
+impl<'s> Source<'s> for Citation<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}
+
+impl<'s> Source<'s> for CitationReference<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}

src/parser/token.rs

@@ -58,6 +58,8 @@ impl<'r, 's> Token<'r, 's> {
                 Object::FootnoteReference(inner) => {
                     Box::new(inner.definition.iter().map(Token::Object))
                 }
+                Object::Citation(_) => Box::new(std::iter::empty()), // TODO: Iterate over children
+                Object::CitationReference(_) => Box::new(std::iter::empty()), // TODO: Iterate over children
             },
             Token::Element(elem) => match elem {
                 Element::Paragraph(inner) => Box::new(inner.children.iter().map(Token::Object)),