优化模板解析;修复事件绑定

src/constants.js

@@ -44,7 +44,6 @@ export const __props__ = Symbol('props')
 export const __changed_props__ = Symbol('changed_props')
 export const __mounted__ = Symbol('mounted')
 export const __pending__ = Symbol('pending')
-export const __children__ = Symbol('children')
 
 export const RESET_CSS_STYLE = `* {box-sizing: border-box;margin: 0;padding: 0;}::before,::after {box-sizing: border-box;}::selection {background: var(--selection-background, var(--color-plain-a));color: var(--selection-color, inherit);}`
 

src/html.js

@@ -6,6 +6,7 @@
 
 import { boolMap, WC_PART, NOTHING } from './constants.js'
 import { animate, MODES } from './anim.js'
+import { nextTick } from './utils.js'
 
 const boundAttributeSuffix = '$wc$'
 const marker = `wc$${String(Math.random()).slice(9)}$`
@@ -265,7 +266,7 @@ class TemplateInstance {
     } while ((node = walker.nextNode()) !== null)
   }
 
-  _clone(options) {
+  clone(options) {
     let {
       el: { content },
       parts
@@ -326,7 +327,7 @@ class TemplateInstance {
 
     return fragment
   }
-  _update(values) {
+  update(values) {
     let i = 0
     for (let part of this.$parts) {
       if (part !== void 0) {
@@ -343,9 +344,10 @@ class TemplateInstance {
 }
 
 class ChildPart {
+  #value = NOTHING
+
   constructor(startNode, endNode, parent, options) {
     this.type = CHILD_PART
-    this._$committedValue = NOTHING
     this.startNode = startNode
     this.endNode = endNode
     this.$parent = parent
@@ -364,46 +366,43 @@ class ChildPart {
   $setValue(value) {
     if (isPrimitive(value)) {
       if (value === NOTHING || value == null || value === '') {
-        if (this._$committedValue !== NOTHING) {
+        if (this.#value !== NOTHING) {
           this.#clear()
         }
-        this._$committedValue = NOTHING
-      } else if (value !== this._$committedValue) {
-        this._commitText(value)
+        this.#value = NOTHING
+      } else if (value !== this.#value) {
+        this.#commitText(value)
       }
     } else if (value['__dom_type__'] !== void 0) {
-      this._commitTemplateResult(value)
+      this.#commitTemplateResult(value)
     } else if (value.nodeType !== void 0) {
-      this._commitNode(value)
+      this.#commitNode(value)
     } else if (isIterable(value)) {
-      this._commitIterable(value)
+      this.#commitIterable(value)
     } else {
-      this._commitText(value)
+      this.#commitText(value)
     }
   }
-  _insert(node, target = this.endNode) {
+  #insert(node, target = this.endNode) {
     return this.startNode.parentNode.insertBefore(node, target)
   }
-  _commitNode(value) {
-    if (this._$committedValue !== value) {
+  #commitNode(value) {
+    if (this.#value !== value) {
       this.#clear()
-      this._$committedValue = this._insert(value)
+      this.#value = this.#insert(value)
     }
   }
-  _commitText(value) {
-    if (
-      this._$committedValue !== NOTHING &&
-      isPrimitive(this._$committedValue)
-    ) {
+  #commitText(value) {
+    if (this.#value !== NOTHING && isPrimitive(this.#value)) {
       let node = this.startNode.nextSibling
 
       node.data = value
     } else {
-      this._commitNode(document.createTextNode(value))
+      this.#commitNode(document.createTextNode(value))
     }
-    this._$committedValue = value
+    this.#value = value
   }
-  _commitTemplateResult(result) {
+  #commitTemplateResult(result) {
     let { values, ['__dom_type__']: type } = result
     let template =
       typeof type === 'number'
@@ -411,16 +410,16 @@ class ChildPart {
         : (type.el === void 0 && (type.el = Template.createElement(type.h)),
           type)
 
-    if (this._$committedValue?.$template === template) {
-      this._$committedValue._update(values)
+    if (this.#value?.$template === template) {
+      this.#value.update(values)
     } else {
       let instance = new TemplateInstance(template, this)
-      let fragment = instance._clone(this.options)
+      let fragment = instance.clone(this.options)
 
-      instance._update(values)
+      instance.update(values)
 
-      this._commitNode(fragment)
-      this._$committedValue = instance
+      this.#commitNode(fragment)
+      this.#value = instance
     }
   }
   #getTemplate(result) {
@@ -432,20 +431,21 @@ class ChildPart {
     }
     return template
   }
-  _commitIterable(value) {
-    if (!isArray(this._$committedValue)) {
-      this._$committedValue = []
+
+  #commitIterable(value) {
+    if (!isArray(this.#value)) {
+      this.#value = []
       this.#clear()
     }
-    let itemParts = this._$committedValue
+    let itemParts = this.#value
     let partIndex = 0
     let itemPart
     for (let item of value) {
       if (partIndex === itemParts.length) {
         itemParts.push(
           (itemPart = new ChildPart(
-            this._insert(createMarker()),
-            this._insert(createMarker()),
+            this.#insert(createMarker()),
+            this.#insert(createMarker()),
             this,
             this.options
           ))
@@ -472,19 +472,19 @@ class ChildPart {
 }
 // 常规属性
 class AttributePart {
+  #value = NOTHING
+
   constructor(element, name, strings, decorates, parent, options = {}) {
     this.type = ATTRIBUTE_PART
-    this._$committedValue = NOTHING
+
     this.element = element
     this.name = name
     this.decorates = decorates
     this.$parent = parent
     this.options = options
     if (strings.length > 2 || strings[0] !== '' || strings[1] !== '') {
-      this._$committedValue = Array(strings.length - 1).fill(null)
+      this.#value = Array(strings.length - 1).fill(null)
       this.strings = strings
-    } else {
-      this._$committedValue = NOTHING
     }
   }
   get tagName() {
@@ -495,9 +495,9 @@ class AttributePart {
     let strings = this.strings
     let changed = false
     if (strings === void 0) {
-      changed = !isPrimitive(value) || value !== this._$committedValue
+      changed = !isPrimitive(value) || value !== this.#value
       if (changed) {
-        this._$committedValue = value
+        this.#value = value
       }
     } else {
       let values = value
@@ -506,13 +506,13 @@ class AttributePart {
       for (let i = 0; i < strings.length - 1; i++) {
         let v = values[valueIndex + i]
 
-        changed || (changed = !isPrimitive(v) || v !== this._$committedValue[i])
+        changed || (changed = !isPrimitive(v) || v !== this.#value[i])
         if (v === NOTHING) {
           value = NOTHING
         } else if (value !== NOTHING) {
           value += (v !== null && v !== void 0 ? v : '') + strings[i + 1]
         }
-        this._$committedValue[i] = v
+        this.#value[i] = v
       }
     }
     if (changed) {
@@ -587,9 +587,27 @@ class EventPart extends AttributePart {
     this.type = EVENT_PART
   }
 
+  #clearBindings() {
+    let host = this.options.host
+    let events = host.$events[this.name]
+
+    for (let i = -1, it; (it = events[++i]); ) {
+      if (!host.root.contains(it.el)) {
+        this.element.removeEventListener(this.name, it.listener, it.options)
+        events[i] = null
+      }
+    }
+    host.$events[this.name] = events.filter(it => it !== null)
+  }
+
   $setValue(listener) {
     let host = this.options.host
     let options = {}
+    let events = host.$events[this.name]
+
+    if (!events) {
+      events = host.$events[this.name] = []
+    }
 
     if (this.decorates.length) {
       for (let it of this.decorates) {
@@ -614,42 +632,40 @@ class EventPart extends AttributePart {
 
     let shouldRemove = listener !== this.#listener
 
-    if (this.#listener && host.$events[this.name]) {
-      for (let it of host.$events[this.name]) {
+    if (this.#listener) {
+      for (let i = -1, it; (it = events[++i]); ) {
         if (it.el === this.element) {
           shouldRemove =
+            shouldRemove ||
             options.capture !== it.capture ||
             options.once !== it.once ||
             options.passive !== it.passive
           if (shouldRemove) {
             this.element.removeEventListener(this.name, it.listener, it.options)
+            events[i] = null
           }
           break
         }
       }
     }
 
+    events = events.filter(it => it !== null)
+    host.$events[this.name] = events
+
     if (listener && shouldRemove) {
       this.element.addEventListener(this.name, this, options)
       this.#listener = listener
 
-      if (host.$events[this.name]) {
-        host.$events[this.name].push({
+      events.push({
         el: this.element,
         listener: this,
         options
       })
-      } else {
-        host.$events[this.name] = [
-          {
-            el: this.element,
-            listener: this,
-            options
-          }
-        ]
-      }
     }
+
+    nextTick(_ => this.#clearBindings())
   }
+
   handleEvent(ev) {
     this.#stop(ev)
     this.#prevent(ev)

src/index.js

@@ -13,8 +13,7 @@ import {
   __props__,
   __changed_props__,
   __mounted__,
-  __pending__,
-  __children__
+  __pending__
 } from './constants.js'
 import { css, adoptStyles } from './css.js'
 import { render, html, svg, raw } from './html.js'
@@ -406,7 +405,7 @@ export class Component extends HTMLElement {
   #render() {
     try {
       let ast = this.render()
-      this[__children__] = render(ast, this.root, {
+      render(ast, this.root, {
         host: this
       })
     } catch (err) {