Squashed 'thirdparty/preact/' content from commit b2d90cc

git-subtree-dir: thirdparty/preact
git-subtree-split: b2d90cc116f1d1998f7a7c98dc6986bf4c1841f4

1 files changed, 50 insertions, 0 deletions

diff --git a/src/vdom/index.js b/src/vdom/index.js
new file mode 100644
index 000000000..50d4ca2b9
--- /dev/null
+++ b/src/vdom/index.js
@@ -0,0 +1,50 @@
+import { clone, isString, isFunction, toLowerCase } from '../util';
+import { isFunctionalComponent } from './functional-component';
+
+
+/** Check if two nodes are equivalent.
+ *	@param {Element} node
+ *	@param {VNode} vnode
+ *	@private
+ */
+export function isSameNodeType(node, vnode) {
+	if (isString(vnode)) {
+		return node instanceof Text;
+	}
+	if (isString(vnode.nodeName)) {
+		return isNamedNode(node, vnode.nodeName);
+	}
+	if (isFunction(vnode.nodeName)) {
+		return node._componentConstructor===vnode.nodeName || isFunctionalComponent(vnode);
+	}
+}
+
+
+export function isNamedNode(node, nodeName) {
+	return node.normalizedNodeName===nodeName || toLowerCase(node.nodeName)===toLowerCase(nodeName);
+}
+
+
+/**
+ * Reconstruct Component-style `props` from a VNode.
+ * Ensures default/fallback values from `defaultProps`:
+ * Own-properties of `defaultProps` not present in `vnode.attributes` are added.
+ * @param {VNode} vnode
+ * @returns {Object} props
+ */
+export function getNodeProps(vnode) {
+	let defaultProps = vnode.nodeName.defaultProps,
+		props = clone(vnode.attributes);
+
+	if (defaultProps) {
+		for (let i in defaultProps) {
+			if (props[i]===undefined) {
+				props[i] = defaultProps[i];
+			}
+		}
+	}
+
+	if (vnode.children) props.children = vnode.children;
+
+	return props;
+}