From 72da90cac0feafb35cac9292105e24f2b5094b45 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Aleksander=20=C5=81ukasz?=
 <aleksander.lukasz@nowoczesnapolska.org.pl>
Date: Mon, 25 Nov 2013 15:37:40 +0100
Subject: [PATCH] smartxml: DocumentNode.getPath

---
 src/smartxml/smartxml.js      | 20 ++++++++++++++++++++
 src/smartxml/smartxml.test.js | 18 ++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/src/smartxml/smartxml.js b/src/smartxml/smartxml.js
index a583848..0e05293 100644
--- a/src/smartxml/smartxml.js
+++ b/src/smartxml/smartxml.js
@@ -40,6 +40,26 @@ $.extend(DocumentNode.prototype, {
         return this.document.createDocumentNode(this._$.clone(true, true)[0]);
     },
 
+    getPath: function(ancestor) {
+        var nodePath = [this].concat(this.parents()),
+            toret, idx;
+        ancestor = ancestor || this.document.root;
+
+        nodePath.some(function(node, i) {
+            if(node.sameNode(ancestor)) {
+                idx = i;
+                return true;
+            }
+        });
+
+        if(idx !== 'undefined') {
+            nodePath = nodePath.slice(0, idx);
+        }
+        toret = nodePath.map(function(node) {return node.getIndex(); });
+        toret.reverse();
+        return toret;
+    },
+
     isRoot: function() {
         return this.document.root.sameNode(this);
     },
diff --git a/src/smartxml/smartxml.test.js b/src/smartxml/smartxml.test.js
index e4dd1a7..180fa87 100644
--- a/src/smartxml/smartxml.test.js
+++ b/src/smartxml/smartxml.test.js
@@ -75,6 +75,24 @@ describe('smartxml', function() {
                 expect(node.nativeNode.isEqualNode(clone.nativeNode)).to.equal(true, 'clone is identical as its originator' + suffix);
             });
         });
+
+        it('knows its path in the document tree', function() {
+            var doc = getDocumentFromXML('<root><a><b><c></c>text</b></a></root>'),
+                root = doc.root,
+                a = root.contents()[0],
+                b = a.contents()[0],
+                text = b.contents()[1];
+
+            expect(root.getPath()).to.eql([], 'path of the root element is empty');
+            expect(a.getPath()).to.eql([0]);
+            expect(b.getPath()).to.eql([0, 0]);
+            expect(text.getPath()).to.eql([0,0,1]);
+
+            /* Paths relative to a given ancestor */
+            expect(text.getPath(root)).to.eql([0,0,1]);
+            expect(text.getPath(a)).to.eql([0,1]);
+            expect(text.getPath(b)).to.eql([1]);
+        });
     });
 
     describe('Basic ElementNode properties', function() {
-- 
2.20.1