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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);
}
}
}
}
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