1 files changed, 33 insertions, 1 deletions
diff --git a/lib/models/summary.js b/lib/models/summary.js
index ec7e05f..8a4afc7 100644
--- a/lib/models/summary.js
+++ b/lib/models/summary.js
@@ -56,7 +56,7 @@ Summary.prototype.getArticle = function(iter, partIter) {
     Return a part/article by its level
 
     @param {String} level
-    @return {Article}
+    @return {Article|Part}
 */
 Summary.prototype.getByLevel = function(level) {
     function iterByLevel(article) {
@@ -130,6 +130,27 @@ Summary.prototype.getPrevArticle = function(current) {
 };
 
 /**
+    Return the parent article, or parent part of an article
+
+    @param {String|Article} current
+    @return {Article|Part|Null}
+*/
+Summary.prototype.getParent = function (level) {
+    // Coerce to level
+    level = is.string(level)? level : level.getLevel();
+
+    // Get parent level
+    var parentLevel = getParentLevel(level);
+    if (!parentLevel) {
+        return null;
+    }
+
+    // Get parent of the position
+    var parentArticle = this.getByLevel(parentLevel);
+    return parentArticle || null;
+};
+
+/**
     Render summary as text
 
     @param {String} parseExt Extension of the parser to use
@@ -188,4 +209,15 @@ Summary.createFromParts = function createFromParts(file, parts) {
     });
 };
 
+/**
+    Returns parent level of a level
+
+    @param {String} level
+    @return {String}
+*/
+function getParentLevel(level) {
+    var parts = level.split('.');
+    return parts.slice(0, -1).join('.');
+}
+
 module.exports = Summary;