From 85374b79c4e9536e0fa8e8391b6b7bce6a6fb069 Mon Sep 17 00:00:00 2001
From: cuixiaorui <cui_xiaorui@126.com>
Date: Tue, 23 Feb 2021 17:40:46 +0800
Subject: [PATCH] feat: add text node logic

---
 src/runtime-core/createApp.ts |  2 +-
 src/runtime-core/h.ts         |  4 ++--
 src/runtime-core/index.ts     |  1 +
 src/runtime-core/renderer.ts  | 27 ++++++++++++++++++++++++++-
 src/runtime-dom/index.ts      | 12 ++++++++++--
 5 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/src/runtime-core/createApp.ts b/src/runtime-core/createApp.ts
index 57b2452..cc0b1a2 100644
--- a/src/runtime-core/createApp.ts
+++ b/src/runtime-core/createApp.ts
@@ -1,5 +1,5 @@
 import { render } from "./renderer";
-import { createVNode } from "./createVNode";
+import { createVNode } from "./vnode";
 
 // createApp
 // 在 vue3 里面 createApp 是属于 renderer 对象的
diff --git a/src/runtime-core/h.ts b/src/runtime-core/h.ts
index 3d87af0..8147d09 100644
--- a/src/runtime-core/h.ts
+++ b/src/runtime-core/h.ts
@@ -1,4 +1,4 @@
-import { createVNode } from "./createVNode";
+import { createVNode } from "./vnode";
 export const h = (type: string, props: any, children: string | Array<any>) => {
-  return createVNode(type,props,children);
+  return createVNode(type, props, children);
 };
diff --git a/src/runtime-core/index.ts b/src/runtime-core/index.ts
index 618ed64..91c124f 100644
--- a/src/runtime-core/index.ts
+++ b/src/runtime-core/index.ts
@@ -3,3 +3,4 @@ export * from "./createApp";
 export { getCurrentInstance } from "./component";
 export { inject, provide } from "./apiInject";
 export { renderSlot } from "./helpers/renderSlot";
+export { createTextVNode } from "./vnode";
diff --git a/src/runtime-core/renderer.ts b/src/runtime-core/renderer.ts
index 3a71115..b1bb255 100644
--- a/src/runtime-core/renderer.ts
+++ b/src/runtime-core/renderer.ts
@@ -6,10 +6,13 @@ import {
   hostPatchProp,
   hostInsert,
   hostRemove,
+  hostSetText,
+  hostCreateText,
 } from "../runtime-dom";
 import { queueJob } from "./scheduler";
 import { effect } from "@vue/reactivity";
 import { setupComponent } from "./component";
+import { Text } from "./vnode";
 import { h } from "./h";
 
 export const render = (vnode, container) => {
@@ -22,8 +25,9 @@ function patch(n1, n2, container = null, parentComponent = null) {
   // 因为 n2 是新的 vnode
   const { type, shapeFlag } = n2;
   switch (type) {
-    case "text":
+    case Text:
       // todo
+      processText(n1, n2, container);
       break;
     // 其中还有几个类型比如： static fragment comment
 
@@ -39,6 +43,27 @@ function patch(n1, n2, container = null, parentComponent = null) {
   }
 }
 
+function processText(n1, n2, container) {
+  console.log("处理 Text 节点");
+  if (n1 === null) {
+    // n1 是 null 说明是 init 的阶段
+    // 基于 createText 创建出 text 节点，然后使用 insert 添加到 el 内
+    console.log("初始化 Text 类型的节点");
+    hostInsert((n2.el = hostCreateText(n2.children as string)), container);
+  } else {
+    // update
+    // 先对比一下 updated 之后的内容是否和之前的不一样
+    // 在不一样的时候才需要 update text
+    // 这里抽离出来的接口是 setText
+    // 注意，这里一定要记得把 n1.el 赋值给 n2.el, 不然后续是找不到值的
+    const el = (n2.el = n1.el!);
+    if (n2.children !== n1.children) {
+      console.log("更新 Text 类型的节点");
+      hostSetText(el, n2.children as string);
+    }
+  }
+}
+
 function processElement(n1, n2, container) {
   if (!n1) {
     mountElement(n2, container);
diff --git a/src/runtime-dom/index.ts b/src/runtime-dom/index.ts
index e0fc275..0dbcf5d 100644
--- a/src/runtime-dom/index.ts
+++ b/src/runtime-dom/index.ts
@@ -7,6 +7,14 @@ export function hostCreateElement(type) {
   return element;
 }
 
+export function hostCreateText(text) {
+  return document.createTextNode(text);
+}
+
+export function hostSetText(node, text) {
+  node.nodeValue = text;
+}
+
 export function hostSetElementText(el, text) {
   console.log("hostSetElementText", el, text);
   el.innerText = text;
@@ -37,10 +45,10 @@ export function hostPatchProp(el, key, preValue, nextValue) {
   }
 }
 
-export function hostInsert(child, parent, anchor=null) {
+export function hostInsert(child, parent, anchor = null) {
   console.log("hostInsert");
   if (anchor) {
-    parent.insertBefore(child,anchor);
+    parent.insertBefore(child, anchor);
   } else {
     parent.appendChild(child);
   }