Create structure for line breaks.

src/parser/object.rs

@@ -23,6 +23,7 @@ pub enum Object<'s> {
     CitationReference(CitationReference<'s>),
     InlineBabelCall(InlineBabelCall<'s>),
     InlineSourceBlock(InlineSourceBlock<'s>),
+    LineBreak(LineBreak<'s>),
 }
 
 #[derive(Debug, PartialEq)]
@@ -149,6 +150,11 @@ pub struct InlineSourceBlock<'s> {
     pub source: &'s str,
 }
 
+#[derive(Debug, PartialEq)]
+pub struct LineBreak<'s> {
+    pub source: &'s str,
+}
+
 impl<'s> Source<'s> for Object<'s> {
     fn get_source(&'s self) -> &'s str {
         match self {
@@ -173,6 +179,7 @@ impl<'s> Source<'s> for Object<'s> {
             Object::CitationReference(obj) => obj.source,
             Object::InlineBabelCall(obj) => obj.source,
             Object::InlineSourceBlock(obj) => obj.source,
+            Object::LineBreak(obj) => obj.source,
         }
     }
 }
@@ -296,3 +303,9 @@ impl<'s> Source<'s> for InlineSourceBlock<'s> {
         self.source
     }
 }
+
+impl<'s> Source<'s> for LineBreak<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}