1 files changed, 63 insertions, 0 deletions
diff --git a/node_modules/morphdom/src/morphAttrs.js b/node_modules/morphdom/src/morphAttrs.js
new file mode 100644
index 0000000..b07d709
--- /dev/null
+++ b/node_modules/morphdom/src/morphAttrs.js
@@ -0,0 +1,63 @@
+var DOCUMENT_FRAGMENT_NODE = 11;
+
+export default function morphAttrs(fromNode, toNode) {
+    var toNodeAttrs = toNode.attributes;
+    var attr;
+    var attrName;
+    var attrNamespaceURI;
+    var attrValue;
+    var fromValue;
+
+    // document-fragments dont have attributes so lets not do anything
+    if (toNode.nodeType === DOCUMENT_FRAGMENT_NODE || fromNode.nodeType === DOCUMENT_FRAGMENT_NODE) {
+      return;
+    }
+
+    // update attributes on original DOM element
+    for (var i = toNodeAttrs.length - 1; i >= 0; i--) {
+        attr = toNodeAttrs[i];
+        attrName = attr.name;
+        attrNamespaceURI = attr.namespaceURI;
+        attrValue = attr.value;
+
+        if (attrNamespaceURI) {
+            attrName = attr.localName || attrName;
+            fromValue = fromNode.getAttributeNS(attrNamespaceURI, attrName);
+
+            if (fromValue !== attrValue) {
+                if (attr.prefix === 'xmlns'){
+                    attrName = attr.name; // It's not allowed to set an attribute with the XMLNS namespace without specifying the `xmlns` prefix
+                }
+                fromNode.setAttributeNS(attrNamespaceURI, attrName, attrValue);
+            }
+        } else {
+            fromValue = fromNode.getAttribute(attrName);
+
+            if (fromValue !== attrValue) {
+                fromNode.setAttribute(attrName, attrValue);
+            }
+        }
+    }
+
+    // Remove any extra attributes found on the original DOM element that
+    // weren't found on the target element.
+    var fromNodeAttrs = fromNode.attributes;
+
+    for (var d = fromNodeAttrs.length - 1; d >= 0; d--) {
+        attr = fromNodeAttrs[d];
+        attrName = attr.name;
+        attrNamespaceURI = attr.namespaceURI;
+
+        if (attrNamespaceURI) {
+            attrName = attr.localName || attrName;
+
+            if (!toNode.hasAttributeNS(attrNamespaceURI, attrName)) {
+                fromNode.removeAttributeNS(attrNamespaceURI, attrName);
+            }
+        } else {
+            if (!toNode.hasAttribute(attrName)) {
+                fromNode.removeAttribute(attrName);
+            }
+        }
+    }
+}