Add a compare_properties variant with support for additional properties.

src/compare/diff.rs

@@ -542,11 +542,10 @@ fn new_compare_heading<'b, 's>(
     let mut child_status = Vec::new();
     let mut message = None;
 
-    let additional_property_names = rust
+    let additional_property_names: Vec<String> = rust
         .get_additional_properties()
-        .map(|node_property| EmacsField::Required(node_property.property_name));
-
-    // TODO: This needs to support additional properties from the property drawer
+        .map(|node_property| format!(":{}", node_property.property_name))
+        .collect();
 
     compare_children(
         source,
@@ -561,6 +560,10 @@ fn new_compare_heading<'b, 's>(
         source,
         emacs,
         rust,
+        additional_property_names
+            .iter()
+            .map(String::as_str)
+            .map(EmacsField::Required),
         (
             EmacsField::Required(":level"),
             |r| Some(r.level),

src/compare/macros.rs

@@ -96,6 +96,90 @@ macro_rules! compare_properties {
             new_status
         }
     };
+    // Specifies additional properties
+    ($source:expr, $emacs:expr, $rust:expr, $additionalproperties: expr, $(($emacs_field:expr, $rust_value_getter:expr, $compare_fn: expr)),+) => {
+        {
+            let mut new_status = Vec::new();
+            let children = $emacs.as_list()?;
+            let attributes_child = children
+            .iter()
+            .nth(1)
+            .ok_or("Should have an attributes child.")?;
+            let attributes_map = attributes_child.as_map()?;
+            let mut emacs_keys: BTreeSet<&str> = attributes_map.keys().map(|s| *s).collect();
+            if emacs_keys.contains(":standard-properties") {
+                emacs_keys.remove(":standard-properties");
+            } else {
+                new_status.push(ComparePropertiesResult::SelfChange(DiffStatus::Bad, Some(format!(
+                    "Emacs token lacks :standard-properties field.",
+                ))));
+            }
+            for additional_field in $additionalproperties {
+                match additional_field {
+                    EmacsField::Required(name) if emacs_keys.contains(name) => {
+                        emacs_keys.remove(name);
+                    },
+                    EmacsField::Optional(name) if emacs_keys.contains(name) => {
+                        emacs_keys.remove(name);
+                    },
+                    EmacsField::Required(name) => {
+                        new_status.push(ComparePropertiesResult::SelfChange(DiffStatus::Bad, Some(format!(
+                            "Emacs token lacks required field: {}",
+                            name
+                        ))));
+                    },
+                    EmacsField::Optional(_name) => {},
+                }
+            }
+            $(
+            match $emacs_field {
+                EmacsField::Required(name) if emacs_keys.contains(name) => {
+                    emacs_keys.remove(name);
+                },
+                EmacsField::Optional(name) if emacs_keys.contains(name) => {
+                    emacs_keys.remove(name);
+                },
+                EmacsField::Required(name) => {
+                    new_status.push(ComparePropertiesResult::SelfChange(DiffStatus::Bad, Some(format!(
+                        "Emacs token lacks required field: {}",
+                        name
+                    ))));
+                },
+                EmacsField::Optional(_name) => {},
+            }
+            )+
+
+            if !emacs_keys.is_empty() {
+                let unexpected_keys: Vec<&str> = emacs_keys.into_iter().collect();
+                let unexpected_keys = unexpected_keys.join(", ");
+                new_status.push(ComparePropertiesResult::SelfChange(DiffStatus::Bad, Some(format!(
+                    "Emacs token had extra field(s): {}",
+                    unexpected_keys
+                ))));
+            }
+
+            $(
+            let emacs_name = match $emacs_field {
+                EmacsField::Required(name) => {
+                    name
+                },
+                EmacsField::Optional(name) => {
+                    name
+                },
+            };
+            let result = $compare_fn($source, $emacs, $rust, emacs_name, $rust_value_getter)?;
+            match result {
+                ComparePropertiesResult::SelfChange(DiffStatus::Good, _) => unreachable!("No comparison functions should return SelfChange() when DiffStatus is good."),
+                ComparePropertiesResult::NoChange => {},
+                result => {
+                    new_status.push(result);
+                }
+            }
+            )+
+
+            new_status
+        }
+    };
     // Default case for when there are no expected properties except for :standard-properties
     ($emacs:expr) => {
         {