Compare number lines for example blocks.

src/types/lesser_element.rs

@@ -41,6 +41,7 @@ pub struct ExampleBlock<'s> {
     pub source: &'s str,
     pub name: &'s str,
     pub switches: Option<&'s str>,
+    pub number_lines: Option<SwitchNumberLines>,
     pub contents: &'s str,
 }
 
@@ -107,6 +108,14 @@ pub struct LatexEnvironment<'s> {
     pub source: &'s str,
 }
 
+pub type LineNumber = usize;
+
+#[derive(Debug)]
+pub enum SwitchNumberLines {
+    New(LineNumber),
+    Continued(LineNumber),
+}
+
 impl<'s> Paragraph<'s> {
     pub(crate) fn of_text(input: &'s str) -> Self {
         let mut objects = Vec::with_capacity(1);

src/types/mod.rs

@@ -47,9 +47,11 @@ pub use lesser_element::FixedWidthArea;
 pub use lesser_element::HorizontalRule;
 pub use lesser_element::Keyword;
 pub use lesser_element::LatexEnvironment;
+pub use lesser_element::LineNumber;
 pub use lesser_element::Paragraph;
 pub use lesser_element::Planning;
 pub use lesser_element::SrcBlock;
+pub use lesser_element::SwitchNumberLines;
 pub use lesser_element::TableCell;
 pub use lesser_element::VerseBlock;
 pub use object::AngleLink;