move snabbdom into libs/

libs/snabbdom/src/h.ts

@@ -0,0 +1,50 @@
+import {vnode, VNode, VNodeData} from './vnode';
+export type VNodes = Array<VNode>;
+export type VNodeChildElement = VNode | string | number | undefined | null;
+export type ArrayOrElement<T> = T | T[];
+export type VNodeChildren = ArrayOrElement<VNodeChildElement>
+import * as is from './is';
+
+function addNS(data: any, children: VNodes | undefined, sel: string | undefined): void {
+  data.ns = 'http://www.w3.org/2000/svg';
+  if (sel !== 'foreignObject' && children !== undefined) {
+    for (let i = 0; i < children.length; ++i) {
+      let childData = children[i].data;
+      if (childData !== undefined) {
+        addNS(childData, (children[i] as VNode).children as VNodes, children[i].sel);
+      }
+    }
+  }
+}
+
+export function h(sel: string): VNode;
+export function h(sel: string, data: VNodeData): VNode;
+export function h(sel: string, children: VNodeChildren): VNode;
+export function h(sel: string, data: VNodeData, children: VNodeChildren): VNode;
+export function h(sel: any, b?: any, c?: any): VNode {
+  var data: VNodeData = {}, children: any, text: any, i: number;
+  if (c !== undefined) {
+    data = b;
+    if (is.array(c)) { children = c; }
+    else if (is.primitive(c)) { text = c; }
+    else if (c && c.sel) { children = [c]; }
+  } else if (b !== undefined) {
+    if (is.array(b)) { children = b; }
+    else if (is.primitive(b)) { text = b; }
+    else if (b && b.sel) { children = [b]; }
+    else { data = b; }
+  }
+  if (children !== undefined) {
+    for (i = 0; i < children.length; ++i) {
+      if (is.primitive(children[i])) children[i] = vnode(undefined, undefined, undefined, children[i], undefined);
+    }
+  }
+  if (
+    sel[0] === 's' && sel[1] === 'v' && sel[2] === 'g' &&
+    (sel.length === 3 || sel[3] === '.' || sel[3] === '#')
+  ) {
+    addNS(data, children, sel);
+  }
+  return vnode(sel, data, children, text, undefined);
+};
+export default h;