state/old/state.js

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// state.js v2.3
(() => {
(() => {
try { return document.createElement('div').setAttribute('$t', '1') } catch (e) { }
const originalSetAttribute = Element.prototype.setAttribute
Element.prototype.setAttribute = function (name, value) {
if (!name.startsWith('$')) return originalSetAttribute.call(this, name, value)
return originalSetAttribute.call(this, 'st-' + name.substring(1), value)
}
})()
globalThis.$ = (a, b) => b ? a.querySelector(b) : document.querySelector(a)
globalThis.$$ = (a, b) => b ? a.querySelectorAll(b) : document.querySelectorAll(a)
let _activeBinding = null
let _noWriteBack = null
globalThis.NewState = function (defaults = {}, getter = null, setter = null) {
const _defaults = {}//, _localStorageBinds = {}, _hashBinds = {}
const _stateMappings = new Map()
const _watchers = new Map()
const _watchFunc = (k, cb) => {
if (!_watchers.has(k)) _watchers.set(k, new Set())
!cb ? _watchers.get(k).clear() : _watchers.get(k).add(cb)
}
const _unwatchFunc = (k, cb) => {
if (!_watchers.has(k)) _watchers.set(k, new Set())
_watchers.get(k).delete(cb)
}
const _getter = getter || (k => _defaults[k])
const _setter = setter || ((k, v) => _defaults[k] = v)
Object.assign(_defaults, defaults)
// 创建代理对象,实现数据绑定
return new Proxy(_defaults, {
get(target, key) {
if (key === '__watch') return _watchFunc
if (key === '__unwatch') return _unwatchFunc
if (_activeBinding) {
if (!_stateMappings.has(key)) _stateMappings.set(key, new Set())
_stateMappings.get(key).add(_activeBinding)
_activeBinding.node._states.add(_stateMappings) // 存储状态机到节点,方便删除节点时清除绑定
}
return _getter(key)
},
set(target, key, value) {
if (_getter(key) !== value) { // 允许自赋值,用来触发更新
_setter(key, value)
}
if (_watchers.has(key)) {
_watchers.get(key).forEach(cb => {
const r = cb(value)
if (r !== undefined) {
value = r
target[key] = value
}
})
}
if (_watchers.has(null)) {
_watchers.get(null).forEach(cb => cb(value))
}
if (_stateMappings.has(key)) {
const bindings = _stateMappings.get(key)
for (const binding of bindings) {
if (!binding.node.isConnected) {
bindings.delete(binding)
continue
}
if (_noWriteBack !== binding.node) _updateBinding(binding)
}
}
return true
}
})
}
function _returnCode(code, vars, thisObj, extendVars) {
if (code.includes('${')) return _runCode('return `' + code + '`', vars, thisObj, extendVars)
else return _runCode('return ' + code, vars, thisObj, extendVars)
}
let _disableRunCodeError = false
function _runCode(code, vars, thisObj, extendVars) {
const argKeys = [...Object.keys(extendVars), ...Object.keys(vars)]
const argValues = [...Object.values(extendVars), ...Object.values(vars)]
argKeys.push(code)
try {
const r = new Function(...argKeys).apply(thisObj, argValues)
return r
} catch (e) {
if (!_disableRunCodeError) console.error(e, extendVars, [code, extendVars, vars, thisObj])
return null
}
}
function _clearRenderedNodes(node) {
if (node._renderedNodes) node._renderedNodes.forEach(nodes => {
nodes.forEach(child => {
child.remove()
if (child._renderedNodes) _clearRenderedNodes(child)
})
})
}
// 更新绑定值
function _updateBinding(binding) {
const node = binding.node
const tpl = binding.tpl
const exp = binding.exp
// 每次都动态重建绑定,确保最新状态
_activeBinding = binding
let result = exp ? (tpl ? _returnCode(tpl, { thisNode: node }, node._thisObj || node, node._ref || null) : null) : tpl
_activeBinding = null
if (binding.prop) {
// 处理对象绑定
const prop = binding.prop
let o = node
for (let i = 0; i < prop.length - 1; i++) {
if (!prop[i]) continue
if (o[prop[i]] == null) o[prop[i]] = {}
o = o[prop[i]]
if (typeof o !== 'object') break
}
if (typeof o === 'object' && o !== null) {
const resultIsObject = typeof result === 'object' && result != null && !Array.isArray(result)
const lk = prop[prop.length - 1]
if (lk) {
if (resultIsObject && o[lk] == null) o[lk] = {}
const lo = o[lk]
if (typeof lo === 'object' && lo != null && lo.__watch) Object.assign(lo, result)
else o[lk] = result
} else if (resultIsObject && typeof o === 'object') {
Object.assign(o, result)
}
}
} else if (binding.attr) {
// 处理attr绑定
const attr = binding.attr
if (attr === 'if') {
if (result) {
node._children.forEach(child => {
node.parentNode.insertBefore(child, node)
child._ref = { ...node._ref }
})
node._renderedNodes = [node._children]
} else {
_clearRenderedNodes(node)
node._renderedNodes = []
}
} else if (attr === 'each') {
if (result && typeof result === 'object') {
const asName = node.getAttribute('as') || 'item'
const indexName = node.getAttribute('index') || 'index'
let keys, getVal;
if (result instanceof Map) {
keys = Array.from(result.keys())
getVal = k => result.get(k)
} else if (typeof result[Symbol.iterator] === 'function') {
const arr = Array.isArray(result) ? result : Array.from(result)
keys = new Array(arr.length)
for (let i = 0; i < arr.length; i++) keys[i] = i
getVal = k => arr[k]
} else {
keys = Object.keys(result)
getVal = k => result[k]
}
keys.forEach((k, i) => {
const item = getVal(k)
if (i < node._renderedNodes.length) {
node._renderedNodes[i].forEach(child => {
child._ref[indexName] = k
child._ref[asName] = item
_scanTree(child)
})
} else {
const newNodes = []
node._children.forEach(child => {
const cloned = child.cloneNode(true)
cloned._ref = { ...node._ref }
cloned._ref[indexName] = k
cloned._ref[asName] = item
cloned._thisObj = node._thisObj
node.parentNode.insertBefore(cloned, node)
newNodes.push(cloned)
})
node._renderedNodes.push(newNodes)
}
})
while (node._renderedNodes.length > keys.length) {
node._renderedNodes[node._renderedNodes.length - 1].forEach(child => {
_clearRenderedNodes(child)
child.remove()
})
node._renderedNodes.pop()
}
} else {
_clearRenderedNodes(node)
node._renderedNodes = []
}
} else if (attr === 'bind') {
if (['INPUT', 'SELECT', 'TEXTAREA'].includes(node.tagName)) {
// 防止浏览器后退前进后擅自恢复表单值
if (!node.hasAttribute('autocomplete')) node.setAttribute('autocomplete', 'off')
}
if (node.type === 'checkbox') {
if (node.value !== 'on' && !result) {
// 复选框有指定名字且未绑定值时,使用多选模式
_runCode(`${tpl} = []`, { thisNode: node }, node._thisObj || node, node._ref || {})
result = []
}
node._checkboxMultiMode = result instanceof Array
const isChecked = result instanceof Array ? result.includes(node.value) : !!result
if (node.checked !== isChecked) node.checked = isChecked
} else if (node.type === 'radio') {
if (node.checked !== (node.value === String(result ?? ''))) node.checked = (node.value === String(result ?? ''))
} else if ('value' in node && node.type !== 'file') {
Promise.resolve().then(() => { // 确保 select 元素值处理好再设置
if (node.value !== String(result ?? '')) node.value = result
})
} else if (node.isContentEditable) {
if (node.innerHTML !== String(result ?? '')) node.innerHTML = result
}
node.dispatchEvent(new CustomEvent('bind', { bubbles: false, detail: result }))
} else {
if (['checked', 'disabled', 'readonly'].includes(attr)) result = !!result
if (typeof result === 'boolean') {
result ? node.setAttribute(attr, '') : node.removeAttribute(attr)
} else if (result !== undefined) {
if (typeof result !== 'string') result = JSON.stringify(result)
if (attr === 'text') {
node.textContent = result ?? ''
} else if (attr === 'html') {
node.innerHTML = result ?? ''
} else if (node.tagName === 'IMG' && attr === 'src' && result.includes('.svg')) {
node.setAttribute('_src', result ?? '')
} else {
node.setAttribute(attr, result ?? '')
}
}
}
}
}
const _initBinding = (binding) => {
if (!binding.node._bindings) binding.node._bindings = []
binding.node._bindings.push({ attr: binding.attr, prop: binding.prop, tpl: binding.tpl, exp: binding.exp }) // 存储绑定信息,方便恢复
_updateBinding(binding)
}
// 旧逻辑,存在合并优先级问题
// const _mergeNode = (from, to, scanObj, exists = {}) => {
// Array.from(from.attributes).forEach(attr => attr.name !== 'class' && to.setAttribute(attr.name, attr.value))
// to.classList.add(...from.classList)
// Array.from(from.childNodes).forEach(child => to.appendChild(child))
// // 实现组件继承
// if (Component.exists(from.tagName)) _makeComponent(from.tagName, to, scanObj, exists)
// }
// 新逻辑,智能合并 style外部样式放在后面以获得更高 CSS 优先级
const _mergeNode = (from, to, scanObj, exists = {}) => {
Array.from(from.attributes).forEach(attr => {
if (attr.name === 'class') return
if (attr.name === 'style') {
// 智能合并 style外部样式放在后面以获得更高 CSS 优先级
if (to.hasAttribute('style')) to.setAttribute('style', `${attr.value}; ${to.getAttribute('style')}`)
else to.setAttribute('style', attr.value)
} else if (!to.hasAttribute(attr.name)) {
to.setAttribute(attr.name, attr.value)
}
})
to.classList.add(...from.classList)
Array.from(from.childNodes).forEach(child => to.appendChild(child))
if (Component.exists(from.tagName)) _makeComponent(from.tagName, to, scanObj, exists)
}
const _makeComponent = (name, node, scanObj, exists = {}) => {
if (exists[name]) return
exists[name] = true
if (scanObj.thisObj) Array.from(node.attributes).forEach(attr => { if ((attr.name.startsWith('$') || attr.name.startsWith('st-')) && attr.value.includes('this.')) attr.value = attr.value.replace(/\bthis\./g, 'this.parent.') }) // 在父组件中的子组件属性里的this.需要转换为this.parent.,因为实际运行会在子组件上下文执行
const componentFunc = Component.getSetupFunction(name)
const slots = {}
Array.from(node.childNodes).forEach(child => {
if (child.nodeType === Node.ELEMENT_NODE && child.hasAttribute('slot')) {
slots[child.getAttribute('slot')] = child
child.removeAttribute('slot')
}
})
node.innerHTML = ''
node.state = NewState(node.state || {})
const template = Component.getTemplate(name)
if (template) {
const tplnode = template.content.cloneNode(true)
if (tplnode.childNodes.length) {
const rootNode = tplnode.children[0]
_mergeNode(rootNode, node, scanObj, exists)
$$(node, '[slot-id]').forEach(placeholder => {
const slotName = placeholder.getAttribute('slot-id')
if (slots[slotName]) {
placeholder.removeAttribute('slot-id')
placeholder.innerHTML = ''
_mergeNode(slots[slotName], placeholder, scanObj, exists)
}
})
}
}
if (componentFunc) componentFunc(node)
}
const _parseNode = (node, scanObj) => {
if (node._bindings) {
// 恢复绑定信息
node._states = new Set()
node._bindings.forEach(bindingData => {
const binding = { node: node, ...bindingData }
_updateBinding(binding)
})
if (node._hasOnUpdate) node.dispatchEvent(new Event('update', { bubbles: false }))
return
}
// 处理组件
if (Component.exists(node.tagName) && !node._componentInitialized) {
_makeComponent(node.tagName, node, scanObj)
$$(node, '[slot-id]').forEach(placeholder => placeholder.removeAttribute('slot-id'))
node._componentInitialized = true
if (!node._thisObj) node._thisObj = node
}
let attrs = []
if (node.tagName === 'TEMPLATE') {
node._children = [...node.content.childNodes]
node._renderedNodes = []
if (node.hasAttribute('$if')) attrs.push(node.getAttributeNode('$if'))
else if (node.hasAttribute('$each')) attrs.push(node.getAttributeNode('$each'))
else if (node.hasAttribute('st-if')) attrs.push(node.getAttributeNode('st-if'))
else if (node.hasAttribute('st-each')) attrs.push(node.getAttributeNode('st-each'))
} else {
attrs = Array.from(node.attributes).filter(attr => (attr.name.startsWith('$') || attr.name.startsWith('st-')) && !['$if', '$each', 'st-if', 'st-each'].includes(attr.name) || attr.name.includes('.'))
}
if (node._thisObj && scanObj.thisObj) node._thisObj.parent = scanObj.thisObj
if (!node._thisObj) node._thisObj = scanObj.thisObj || null
if (!node._ref) node._ref = scanObj.extendVars || {}
node._states = new Set()
// node._handleEvents = []
attrs.forEach(attr => {
const exp = attr.name.startsWith('$') || attr.name.startsWith('st-')
const realAttrName = exp ? attr.name.slice(attr.name.startsWith('$') ? 1 : 3) : attr.name
let tpl = attr.value
node.removeAttribute(attr.name)
if (realAttrName.startsWith('.')) {
// 处理属性绑定
_initBinding({ node: node, prop: realAttrName.split('.'), tpl, exp })
} else {
if (realAttrName.startsWith('on')) {
if (realAttrName === 'onupdate') node._hasOnUpdate = true
if (realAttrName === 'onload' && !['BODY', 'IMG', 'IFRAME'].includes(node.tagName)) node._hasOnLoad = true
if (realAttrName === 'onunload' && !['BODY', 'IMG', 'IFRAME'].includes(node.tagName)) node._hasOnUnload = true;
// node._handleEvents.push(realAttrName.slice(2));
((node, thisObj) => {
node.addEventListener(realAttrName.slice(2), (e) => {
_runCode(tpl, { event: e, thisNode: node, ...(e.detail || {}) }, thisObj || node, node._ref || {})
})
})(node, scanObj.thisObj)
} else {
if (realAttrName === 'bind') {
// 处理 bind 指令(双向数据绑定)
node.addEventListener(node.tagName === 'TEXTAREA' || node.isContentEditable || node.type === 'text' || node.type === 'password' ? 'input' : 'change', (e) => {
let newVal = node.isContentEditable ? e.target.innerHTML : (node.type === 'checkbox' ? e.target.checked : e.target.files || e.target.value || e.detail)
_noWriteBack = node
_disableRunCodeError = true // 忽略赋值错误,支持非对象类型的 $bind
if (node.type === 'checkbox' && node._checkboxMultiMode) {
_runCode(`!!checked ? (!${tpl}.includes(val) && ${tpl}.push(val)) : (index = ${tpl}.indexOf(val), index > -1 && ${tpl}.splice(index, 1))`, { val: node.value, checked: newVal, thisNode: node }, scanObj.thisObj || node, node._ref || {})
} else {
_runCode(`${tpl} = val`, { val: newVal, thisNode: node }, scanObj.thisObj || node, node._ref || {})
}
_disableRunCodeError = false
_noWriteBack = null
})
} else if (realAttrName === 'text' && !tpl) {
tpl = node.textContent
node.textContent = ''
}
if (tpl) _initBinding({ node: node, attr: realAttrName, tpl, exp })
}
}
})
if (node._hasOnLoad || node._componentInitialized) {
(node => {
Promise.resolve().then(() => node.dispatchEvent(new Event('load', { bubbles: false })))
})(node)
}
if (node._hasOnUpdate) node.dispatchEvent(new Event('update', { bubbles: false }))
if (node._thisObj) scanObj.thisObj = node._thisObj
}
const _scanTree = (node, scanObj = {}) => {
if (node.nodeType !== 1) return
// 自动为非模板节点的$if和$each指令创建模版节点
if (node.tagName !== 'TEMPLATE' && (node.hasAttribute('$if') || node.hasAttribute('$each') || node.hasAttribute('st-if') || node.hasAttribute('st-each'))) {
const template = document.createElement('TEMPLATE')
const attrs = Array.from(node.attributes).filter(attr => ['$if', '$each', 'st-if', 'st-each'].includes(attr.name) || ((node.hasAttribute('$each') || node.hasAttribute('st-each')) && ['as', 'index'].includes(attr.name)))
attrs.forEach(attr => {
template.setAttribute(attr.name, attr.value)
node.removeAttribute(attr.name)
})
node.parentNode.insertBefore(template, node)
template.content.appendChild(node)
template._ref = node._ref
node = template
return // 异步交给MutationObserver处理
}
// 处理模板节点同时存在$if和$each指令的情况 自动为第二个指令创建模版节点
if (node.tagName === 'TEMPLATE' && (node.hasAttribute('$if') || node.hasAttribute('st-if')) && (node.hasAttribute('$each') || node.hasAttribute('st-each'))) {
const template = document.createElement('TEMPLATE')
const attrs = Array.from(node.attributes).filter(attr => ['$if', '$each', 'st-if', 'st-each'].includes(attr.name))
const attr = attrs[attrs.length - 1]
template.setAttribute(attr.name, attr.value)
node.removeAttribute(attr.name)
if (attr.name === '$each' || attr.name === 'st-each') {
Array.from(node.attributes).filter(attr => ['as', 'index'].includes(attr.name)).forEach(attr => {
template.setAttribute(attr.name, attr.value)
node.removeAttribute(attr.name)
})
}
Array.from(node.content.childNodes).forEach(child => {
template.content.appendChild(child)
})
node.content.appendChild(template)
template._ref = node._ref
}
// 处理 SVG
if (node.tagName === 'IMG' && (node.hasAttribute('src') || node.hasAttribute('_src') || node.hasAttribute('$src'))) {
const imgNode = node
Promise.resolve().then(() => {
const url = imgNode.getAttribute('_src') || imgNode.getAttribute('src')
if (url) fetch(url, { cache1: 'force-cache' }).then(r => {
return r.text()
}).then(svgText => {
const realSvg = new DOMParser().parseFromString(svgText, "image/svg+xml").querySelector('svg')
if (realSvg) {
Array.from(imgNode.attributes).forEach(attr => realSvg.setAttribute(attr.name, attr.value))
imgNode.replaceWith(realSvg)
}
})
})
}
if (node._thisObj !== undefined) scanObj.thisObj = node._thisObj || null
if (scanObj.thisObj === undefined) {
// 向上查找_thisObj如果没有就用nullnull 代表就是没有undefined 表示需要向上查找
let curr = node
while (curr && curr._thisObj === undefined) curr = curr.parentNode
scanObj.thisObj = curr ? curr._thisObj : null
}
if (node._ref === undefined) {
let curr = node
while (curr && curr._ref === undefined) curr = curr.parentNode
node._ref = curr ? { ...curr._ref } : {}
}
if (scanObj.extendVars === undefined) scanObj.extendVars = {}
if (node._ref !== undefined) {
Object.assign(node._ref, scanObj.extendVars)
scanObj.extendVars = { ...node._ref }
}
_parseNode(node, scanObj)
const nodes = [...(node.childNodes || [])]
scanObj.extendVars = node._ref || scanObj.extendVars
nodes.forEach(child => _scanTree(child, { thisObj: scanObj.thisObj, extendVars: { ...node._ref } }))
}
const _unbindTree = (node) => {
if (node.nodeType !== 1) return
if (node._hasOnUnload) node.dispatchEvent(new Event('unload', { bubbles: false }))
if (node._states) {
node._states.forEach(stateMappings => {
for (const [key, bindingSet] of stateMappings) {
for (const binding of bindingSet) {
if (binding.node === node) bindingSet.delete(binding)
}
}
})
}
node.childNodes && node.childNodes.forEach(child => _unbindTree(child))
}
globalThis.RefreshState = _scanTree
const _components = new Map()
const _pendingTemplates = []
globalThis.Component = {
getTemplate: name => $(`template[component="${name.toUpperCase()}"]`),
register: (name, setupFunc, templateNode = null, ...globalNodes) => {
_components.set(name.toUpperCase(), setupFunc)
if (document.readyState !== 'loading') Component._addTemplate(name, templateNode, globalNodes)
else _pendingTemplates.push([name, templateNode, globalNodes])
},
exists: (name) => _components.has(name.toUpperCase()),
getSetupFunction: (name) => _components.get(name.toUpperCase()),
_addTemplate: (name, templateNode, globalNodes) => {
if (templateNode) {
const template = document.createElement('TEMPLATE')
template.setAttribute('component', name.toUpperCase())
template.content.appendChild(templateNode)
document.body.appendChild(template)
}
if (globalNodes) globalNodes.forEach(node => document.body.appendChild(node))
}
}
document.addEventListener('DOMContentLoaded', () => {
_pendingTemplates.forEach(([name, templateNode, globalNodes]) => Component._addTemplate(name, templateNode, globalNodes))
_pendingTemplates.length = 0
}, true)
document.addEventListener('DOMContentLoaded', () => {
new MutationObserver(mutations => {
mutations.forEach(mutation => {
mutation.addedNodes.forEach(newNode => {
if (newNode.isConnected) _scanTree(newNode)
})
mutation.removedNodes.forEach(oldNode => _unbindTree(oldNode))
})
}).observe(document.documentElement, { childList: true, subtree: true })
_scanTree(document.documentElement)
})
})()