Compare children of sections.

src/compare/diff.rs

@@ -4,6 +4,8 @@ use crate::parser::Document;
 use crate::parser::DocumentElement;
 use crate::parser::Heading;
 use crate::parser::Section;
+use crate::parser::Paragraph;
+use crate::parser::Element;
 
 #[derive(Debug)]
 pub struct DiffResult {
@@ -132,6 +134,10 @@ pub fn compare_section<'s>(
         this_status = DiffStatus::Bad;
     }
 
+    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
+        child_status.push(compare_element(source, emacs_child, rust_child)?);
+    }
+
     Ok(DiffResult {
         status: this_status,
         name: "section".to_owned(),
@@ -188,3 +194,57 @@ pub fn compare_heading<'s>(
         children: child_status,
     })
 }
+
+pub fn compare_element<'s>(
+    source: &'s str,
+    emacs: &'s Token<'s>,
+    rust: &'s Element<'s>,
+) -> Result<DiffResult, Box<dyn std::error::Error>> {
+    match rust {
+        Element::Paragraph(obj) => compare_paragraph(source, emacs, obj),
+        Element::PlainList(_) => todo!(),
+        Element::GreaterBlock(_) => todo!(),
+        Element::FootnoteDefinition(_) => todo!(),
+    }
+}
+
+pub fn compare_paragraph<'s>(
+    source: &'s str,
+    emacs: &'s Token<'s>,
+    rust: &'s Paragraph<'s>,
+) -> Result<DiffResult, Box<dyn std::error::Error>> {
+    let children = emacs.as_list()?;
+    let first_child = children.first().ok_or("Should have at least one child.")?.as_atom()?;
+    if first_child != "paragraph" {
+        return Err("Paragraph should correspond to a paragraph cell.".into());
+    }
+    let mut child_status = Vec::new();
+    let mut this_status = DiffStatus::Good;
+
+    let attributes_child = children
+        .iter()
+        .nth(1)
+        .ok_or("Should have an attributes child.")?;
+    let attributes_map = attributes_child.as_map()?;
+    let begin = attributes_map
+        .get(":begin")
+        .ok_or("Missing :begin attribute.")?
+        .as_atom()?;
+    let end = attributes_map
+        .get(":end")
+        .ok_or("Missing :end attribute.")?
+        .as_atom()?;
+    let (rust_begin, rust_end) = get_offsets(source, rust);
+    if (rust_begin + 1).to_string() != begin || (rust_end + 1).to_string() != end {
+        this_status = DiffStatus::Bad;
+    }
+
+    for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
+    }
+
+    Ok(DiffResult {
+        status: this_status,
+        name: "paragraph".to_owned(),
+        children: child_status,
+    })
+}

src/parser/element.rs

@@ -32,6 +32,12 @@ impl<'s> Source<'s> for Element<'s> {
     }
 }
 
+impl<'s> Source<'s> for Paragraph<'s> {
+    fn get_source(&'s self) -> &'s str {
+        self.source
+    }
+}
+
 #[tracing::instrument(ret, level = "debug")]
 pub fn element<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s str, Element<'s>> {
     let non_paragraph_matcher = parser_with_context!(non_paragraph_element)(context);

src/parser/mod.rs

@@ -19,5 +19,7 @@ pub use document::Document;
 pub use document::DocumentElement;
 pub use document::Heading;
 pub use document::Section;
+pub use element::Element;
+pub use lesser_element::Paragraph;
 pub use source::Source;
 type Context<'r, 's> = &'r parser_context::ContextTree<'r, 's>;