From 976844790ebe0963d04a90449a127dd2bc24e5b3 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 19 Jun 2019 17:08:42 +0800
Subject: [PATCH] wip: $state -> $data

---
 packages/runtime-core/src/component.ts      | 42 ++++++++++++---------
 packages/runtime-core/src/componentProxy.ts | 20 +++++-----
 2 files changed, 34 insertions(+), 28 deletions(-)

diff --git a/packages/runtime-core/src/component.ts b/packages/runtime-core/src/component.ts
index 17e5cd81..13ccb6d9 100644
--- a/packages/runtime-core/src/component.ts
+++ b/packages/runtime-core/src/component.ts
@@ -17,7 +17,7 @@ export type Data = { [key: string]: any }
 // public properties exposed on the proxy, which is used as the render context
 // in templates (as `this` in the render option)
 export type ComponentRenderProxy<P = {}, S = {}, PublicProps = P> = {
-  $state: S
+  $data: S
   $props: PublicProps
   $attrs: Data
   $refs: Data
@@ -97,6 +97,8 @@ interface SetupContext {
   attrs: Data
   slots: Slots
   refs: Data
+  parent: ComponentInstance | null
+  root: ComponentInstance
   emit: ((event: string, ...args: any[]) => void)
 }
 
@@ -112,7 +114,7 @@ export type ComponentInstance<P = Data, S = Data> = {
   render: RenderFunction<P, S> | null
 
   // the rest are only for stateful components
-  state: S
+  data: S
   props: P
   renderProxy: ComponentRenderProxy | null
   propsProxy: P | null
@@ -193,7 +195,7 @@ export function createComponentInstance(
     effects: null,
 
     // public properties
-    state: EMPTY_OBJ,
+    data: EMPTY_OBJ,
     props: EMPTY_OBJ,
     attrs: EMPTY_OBJ,
     slots: EMPTY_OBJ,
@@ -217,10 +219,7 @@ export let currentInstance: ComponentInstance | null = null
 export function setupStatefulComponent(instance: ComponentInstance) {
   const Component = instance.type as ComponentOptions
   // 1. create render proxy
-  const proxy = (instance.renderProxy = new Proxy(
-    instance,
-    RenderProxyHandlers
-  ) as any)
+  instance.renderProxy = new Proxy(instance, RenderProxyHandlers) as any
   // 2. call setup()
   const { setup } = Component
   if (setup) {
@@ -233,14 +232,14 @@ export function setupStatefulComponent(instance: ComponentInstance) {
       : null)
     const setupContext = (instance.setupContext =
       setup.length > 1 ? createSetupContext(instance) : null)
-    const setupResult = setup.call(proxy, propsProxy, setupContext)
+    const setupResult = setup.call(null, propsProxy, setupContext)
     if (isFunction(setupResult)) {
       // setup returned an inline render function
       instance.render = setupResult
     } else {
       // setup returned bindings.
       // assuming a render function compiled from template is present.
-      instance.state = state(setupResult)
+      instance.data = state(setupResult)
       if (__DEV__ && !Component.render) {
         // TODO warn missing render fn
       }
@@ -269,7 +268,9 @@ function createSetupContext(instance: ComponentInstance): SetupContext {
     attrs: new Proxy(instance, SetupProxyHandlers.attrs),
     slots: new Proxy(instance, SetupProxyHandlers.slots),
     refs: new Proxy(instance, SetupProxyHandlers.refs),
-    emit: instance.emit
+    emit: instance.emit,
+    parent: instance.parent,
+    root: instance.root
   } as any
   return __DEV__ ? Object.freeze(context) : context
 }
@@ -284,7 +285,9 @@ export function renderComponentRoot(instance: ComponentInstance): VNode {
     slots,
     attrs,
     refs,
-    emit
+    emit,
+    parent,
+    root
   } = instance
   if (vnode.shapeFlag & STATEFUL_COMPONENT) {
     return normalizeVNode(
@@ -292,13 +295,18 @@ export function renderComponentRoot(instance: ComponentInstance): VNode {
     )
   } else {
     // functional
+    const render = Component as FunctionalComponent
     return normalizeVNode(
-      (Component as FunctionalComponent)(props, {
-        attrs,
-        slots,
-        refs,
-        emit
-      })
+      render.length > 1
+        ? render(props, {
+            attrs,
+            slots,
+            refs,
+            emit,
+            parent,
+            root
+          })
+        : render(props, null as any)
     )
   }
 }
diff --git a/packages/runtime-core/src/componentProxy.ts b/packages/runtime-core/src/componentProxy.ts
index 90b75be1..348740a3 100644
--- a/packages/runtime-core/src/componentProxy.ts
+++ b/packages/runtime-core/src/componentProxy.ts
@@ -2,17 +2,17 @@ import { ComponentInstance } from './component'
 
 export const RenderProxyHandlers = {
   get(target: ComponentInstance, key: string) {
-    const { state, props } = target
-    if (state.hasOwnProperty(key)) {
-      return state[key]
+    const { data, props } = target
+    if (data.hasOwnProperty(key)) {
+      return data[key]
     } else if (props.hasOwnProperty(key)) {
       return props[key]
     } else {
       switch (key) {
-        case '$state':
-          return target.state
+        case '$data':
+          return data
         case '$props':
-          return target.props
+          return props
         case '$attrs':
           return target.attrs
         case '$slots':
@@ -23,8 +23,6 @@ export const RenderProxyHandlers = {
           return target.parent
         case '$root':
           return target.root
-        case '$el':
-          return target.vnode && target.vnode.el
         case '$emit':
           return target.emit
         default:
@@ -33,9 +31,9 @@ export const RenderProxyHandlers = {
     }
   },
   set(target: ComponentInstance, key: string, value: any): boolean {
-    const { state } = target
-    if (state.hasOwnProperty(key)) {
-      state[key] = value
+    const { data } = target
+    if (data.hasOwnProperty(key)) {
+      data[key] = value
       return true
     } else {
       if (__DEV__) {