Create structure for export snippets.

src/parser/object.rs

@@ -17,6 +17,7 @@ pub enum Object<'s> {
     OrgMacro(OrgMacro<'s>),
     Entity(Entity<'s>),
     LatexFragment(LatexFragment<'s>),
+    ExportSnippet(ExportSnippet<'s>),
 }
 
 #[derive(Debug, PartialEq)]
@@ -109,6 +110,13 @@ pub struct LatexFragment<'s> {
     pub source: &'s str,
 }
 
+#[derive(Debug, PartialEq)]
+pub struct ExportSnippet<'s> {
+    pub source: &'s str,
+    pub backend: &'s str,
+    pub contents: &'s str,
+}
+
 impl<'s> Source<'s> for Object<'s> {
     fn get_source(&'s self) -> &'s str {
         match self {
@@ -127,6 +135,7 @@ impl<'s> Source<'s> for Object<'s> {
             Object::OrgMacro(obj) => obj.source,
             Object::Entity(obj) => obj.source,
             Object::LatexFragment(obj) => obj.source,
+            Object::ExportSnippet(obj) => obj.source,
         }
     }
 }
@@ -214,3 +223,9 @@ impl<'s> Source<'s> for LatexFragment<'s> {
         self.source
     }
 }
+
+impl<'s> Source<'s> for ExportSnippet<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}