[MOV] move memo and portal to root folder

src/portal.ts

@@ -0,0 +1,70 @@
+import type { ComponentNode } from "./component/component_node";
+import { Component } from "./component/component";
+import { xml } from "./tags";
+import { BDom, text, VNode } from "./blockdom";
+
+const VText: any = text("").constructor;
+
+class VPortal extends VText implements Partial<VNode<VPortal>> {
+  //   selector: string;
+  realBDom: BDom | null;
+  target: HTMLElement | null = null;
+
+  constructor(selector: string, realBDom: BDom) {
+    super("");
+    this.selector = selector;
+    this.realBDom = realBDom;
+  }
+  mount(parent: HTMLElement, anchor: ChildNode) {
+    super.mount(parent, anchor);
+    this.target = document.querySelector(this.selector) as any;
+    if (!this.target) {
+      let el: any = this.el;
+      while (el && el.parentElement instanceof HTMLElement) {
+        el = el.parentElement;
+      }
+      this.target = el && el.querySelector(this.selector);
+      if (!this.target) {
+        throw new Error("invalid portal target");
+      }
+    }
+    this.realBDom!.mount(this.target!, null);
+  }
+
+  beforeRemove() {
+    this.realBDom!.beforeRemove();
+  }
+  remove() {
+    super.remove();
+    this.realBDom!.remove();
+    this.realBDom = null;
+  }
+
+  patch(other: VPortal) {
+    super.patch(other);
+    if (this.realBDom) {
+      this.realBDom.patch(other.realBDom!, true);
+    } else {
+      this.realBDom = other.realBDom;
+      this.realBDom!.mount(this.target!, null);
+    }
+  }
+}
+
+export class Portal extends Component {
+  static template = xml`<t t-slot="default"/>`;
+  static props = {
+    target: {
+      type: String,
+    },
+  };
+
+  constructor(props: any, env: any, node: ComponentNode) {
+    super(props, env, node);
+    node._render = function (fiber: any) {
+      const bdom = new VPortal(props.target, this.renderFn());
+      fiber.bdom = bdom;
+      fiber.root.counter--;
+    };
+  }
+}