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