UPDATE: API for defined names

base/src/workbook.rs

@@ -27,4 +27,27 @@ impl Workbook {
             .get_mut(worksheet_index as usize)
             .ok_or_else(|| "Invalid sheet index".to_string())
     }
+
+    /// Returns the a list of defined names in the workbook with their scope
+    pub(crate) fn get_defined_names_with_scope(&self) -> Vec<(String, Option<u32>)> {
+        let sheet_id_index: Vec<u32> = self.worksheets.iter().map(|s| s.sheet_id).collect();
+
+        let defined_names = self
+            .defined_names
+            .iter()
+            .map(|dn| {
+                let index = dn
+                    .sheet_id
+                    .and_then(|sheet_id| {
+                        // returns an Option<usize>
+                        sheet_id_index.iter().position(|&x| x == sheet_id)
+                    })
+                    // convert Option<usize> to Option<u32>
+                    .map(|pos| pos as u32);
+
+                (dn.name.clone(), index)
+            })
+            .collect::<Vec<_>>();
+        defined_names
+    }
 }