menduner-mall-uniapp/uni_modules/mp-html/components/mp-html/parser.js

/**
 * @fileoverview html 解析器
 */

// 配置
const config = {
	// 信任的标签（保持标签名不变）
	trustTags: makeMap(
		'a,abbr,ad,audio,b,blockquote,br,code,col,colgroup,dd,del,dl,dt,div,em,fieldset,h1,h2,h3,h4,h5,h6,hr,i,img,ins,label,legend,li,ol,p,q,ruby,rt,source,span,strong,sub,sup,table,tbody,td,tfoot,th,thead,tr,title,ul,video'
	),

	// 块级标签（转为 div，其他的非信任标签转为 span）
	blockTags: makeMap('address,article,aside,body,caption,center,cite,footer,header,html,nav,pre,section'),

	// #ifdef (MP-WEIXIN || MP-QQ || APP-PLUS || MP-360) && VUE3
	// 行内标签
	inlineTags: makeMap('abbr,b,big,code,del,em,i,ins,label,q,small,span,strong,sub,sup'),
	// #endif

	// 要移除的标签
	ignoreTags: makeMap(
		'area,base,canvas,embed,frame,head,iframe,input,link,map,meta,param,rp,script,source,style,textarea,title,track,wbr'
	),

	// 自闭合的标签
	voidTags: makeMap(
		'area,base,br,col,circle,ellipse,embed,frame,hr,img,input,line,link,meta,param,path,polygon,rect,source,track,use,wbr'
	),

	// html 实体
	entities: {
		lt: '<',
		gt: '>',
		quot: '"',
		apos: "'",
		ensp: '\u2002',
		emsp: '\u2003',
		nbsp: '\xA0',
		semi: ';',
		ndash: '–',
		mdash: '—',
		middot: '·',
		lsquo: '‘',
		rsquo: '’',
		ldquo: '“',
		rdquo: '”',
		bull: '•',
		hellip: '…',
		larr: '←',
		uarr: '↑',
		rarr: '→',
		darr: '↓'
	},

	// 默认的标签样式
	tagStyle: {
		// #ifndef APP-PLUS-NVUE
		address: 'font-style:italic',
		big: 'display:inline;font-size:1.2em',
		caption: 'display:table-caption;text-align:center',
		center: 'text-align:center',
		cite: 'font-style:italic',
		dd: 'margin-left:40px',
		mark: 'background-color:yellow',
		pre: 'font-family:monospace;white-space:pre',
		s: 'text-decoration:line-through',
		small: 'display:inline;font-size:0.8em',
		strike: 'text-decoration:line-through',
		u: 'text-decoration:underline'
		// #endif
	},

	// svg 大小写对照表
	svgDict: {
		animatetransform: 'animateTransform',
		lineargradient: 'linearGradient',
		viewbox: 'viewBox',
		attributename: 'attributeName',
		repeatcount: 'repeatCount',
		repeatdur: 'repeatDur'
	}
}
const tagSelector = {}
const {
	windowWidth,
	// #ifdef MP-WEIXIN
	system
	// #endif
} = uni.getSystemInfoSync()
const blankChar = makeMap(' ,\r,\n,\t,\f')
let idIndex = 0

// #ifdef H5 || APP-PLUS
config.ignoreTags.iframe = undefined
config.trustTags.iframe = true
config.ignoreTags.embed = undefined
config.trustTags.embed = true
// #endif
// #ifdef APP-PLUS-NVUE
config.ignoreTags.source = undefined
config.ignoreTags.style = undefined
// #endif

/**
 * @description 创建 map
 * @param {String} str 逗号分隔
 */
function makeMap(str) {
	const map = Object.create(null)
	const list = str.split(',')
	for (let i = list.length; i--;) {
		map[list[i]] = true
	}
	return map
}

/**
 * @description 解码 html 实体
 * @param {String} str 要解码的字符串
 * @param {Boolean} amp 要不要解码 &amp;
 * @returns {String} 解码后的字符串
 */
function decodeEntity(str, amp) {
	let i = str.indexOf('&')
	while (i !== -1) {
		const j = str.indexOf(';', i + 3)
		let code
		if (j === -1) break
		if (str[i + 1] === '#') {
			// &#123; 形式的实体
			code = parseInt((str[i + 2] === 'x' ? '0' : '') + str.substring(i + 2, j))
			if (!isNaN(code)) {
				str = str.substr(0, i) + String.fromCharCode(code) + str.substr(j + 1)
			}
		} else {
			// &nbsp; 形式的实体
			code = str.substring(i + 1, j)
			if (config.entities[code] || (code === 'amp' && amp)) {
				str = str.substr(0, i) + (config.entities[code] || '&') + str.substr(j + 1)
			}
		}
		i = str.indexOf('&', i + 1)
	}
	return str
}

/**
 * @description 合并多个块级标签，加快长内容渲染
 * @param {Array} nodes 要合并的标签数组
 */
function mergeNodes(nodes) {
	let i = nodes.length - 1
	for (let j = i; j >= -1; j--) {
		if (j === -1 || nodes[j].c || !nodes[j].name || (nodes[j].name !== 'div' && nodes[j].name !== 'p' && nodes[j]
				.name[0] !== 'h') || (nodes[j].attrs.style || '').includes('inline')) {
			if (i - j >= 5) {
				nodes.splice(j + 1, i - j, {
					name: 'div',
					attrs: {},
					children: nodes.slice(j + 1, i + 1)
				})
			}
			i = j - 1
		}
	}
}

/**
 * @description html 解析器
 * @param {Object} vm 组件实例
 */
function Parser(vm) {
	this.options = vm || {}
	this.tagStyle = Object.assign({}, config.tagStyle, this.options.tagStyle)
	this.imgList = vm.imgList || []
	this.imgList._unloadimgs = 0
	this.plugins = vm.plugins || []
	this.attrs = Object.create(null)
	this.stack = []
	this.nodes = []
	this.pre = (this.options.containerStyle || '').includes('white-space') && this.options.containerStyle.includes(
		'pre') ? 2 : 0
}

/**
 * @description 执行解析
 * @param {String} content 要解析的文本
 */
Parser.prototype.parse = function(content) {
	// 插件处理
	for (let i = this.plugins.length; i--;) {
		if (this.plugins[i].onUpdate) {
			content = this.plugins[i].onUpdate(content, config) || content
		}
	}

	new Lexer(this).parse(content)
	// 出栈未闭合的标签
	while (this.stack.length) {
		this.popNode()
	}
	if (this.nodes.length > 50) {
		mergeNodes(this.nodes)
	}
	return this.nodes
}

/**
 * @description 将标签暴露出来（不被 rich-text 包含）
 */
Parser.prototype.expose = function() {
	// #ifndef APP-PLUS-NVUE
	for (let i = this.stack.length; i--;) {
		const item = this.stack[i]
		if (item.c || item.name === 'a' || item.name === 'video' || item.name === 'audio') return
		item.c = 1
	}
	// #endif
}

/**
 * @description 处理插件
 * @param {Object} node 要处理的标签
 * @returns {Boolean} 是否要移除此标签
 */
Parser.prototype.hook = function(node) {
	for (let i = this.plugins.length; i--;) {
		if (this.plugins[i].onParse && this.plugins[i].onParse(node, this) === false) {
			return false
		}
	}
	return true
}

/**
 * @description 将链接拼接上主域名
 * @param {String} url 需要拼接的链接
 * @returns {String} 拼接后的链接
 */
Parser.prototype.getUrl = function(url) {
	const domain = this.options.domain
	if (url[0] === '/') {
		if (url[1] === '/') {
			// // 开头的补充协议名
			url = (domain ? domain.split('://')[0] : 'http') + ':' + url
		} else if (domain) {
			// 否则补充整个域名
			url = domain + url
		} /* #ifdef APP-PLUS */
		else {
			url = plus.io.convertLocalFileSystemURL(url)
		} /* #endif */
	} else if (!url.includes('data:') && !url.includes('://')) {
		if (domain) {
			url = domain + '/' + url
		} /* #ifdef APP-PLUS */
		else {
			url = plus.io.convertLocalFileSystemURL(url)
		} /* #endif */
	}
	return url
}

/**
 * @description 解析样式表
 * @param {Object} node 标签
 * @returns {Object}
 */
Parser.prototype.parseStyle = function(node) {
	const attrs = node.attrs
	const list = (this.tagStyle[node.name] || '').split(';').concat((attrs.style || '').split(';'))
	const styleObj = {}
	let tmp = ''

	if (attrs.id && !this.xml) {
		// 暴露锚点
		if (this.options.useAnchor) {
			this.expose()
		} else if (node.name !== 'img' && node.name !== 'a' && node.name !== 'video' && node.name !== 'audio') {
			attrs.id = undefined
		}
	}

	// 转换 width 和 height 属性
	if (attrs.width) {
		styleObj.width = parseFloat(attrs.width) + (attrs.width.includes('%') ? '%' : 'px')
		attrs.width = undefined
	}
	if (attrs.height) {
		styleObj.height = parseFloat(attrs.height) + (attrs.height.includes('%') ? '%' : 'px')
		attrs.height = undefined
	}

	for (let i = 0, len = list.length; i < len; i++) {
		const info = list[i].split(':')
		if (info.length < 2) continue
		const key = info.shift().trim().toLowerCase()
		let value = info.join(':').trim()
		if ((value[0] === '-' && value.lastIndexOf('-') > 0) || value.includes('safe')) {
			// 兼容性的 css 不压缩
			tmp += `;${key}:${value}`
		} else if (!styleObj[key] || value.includes('import') || !styleObj[key].includes('import')) {
			// 重复的样式进行覆盖
			if (value.includes('url')) {
				// 填充链接
				let j = value.indexOf('(') + 1
				if (j) {
					while (value[j] === '"' || value[j] === "'" || blankChar[value[j]]) {
						j++
					}
					value = value.substr(0, j) + this.getUrl(value.substr(j))
				}
			} else if (value.includes('rpx')) {
				// 转换 rpx（rich-text 内部不支持 rpx）
				value = value.replace(/[0-9.]+\s*rpx/g, $ => parseFloat($) * windowWidth / 750 + 'px')
			}
			styleObj[key] = value
		}
	}

	node.attrs.style = tmp
	return styleObj
}

/**
 * @description 解析到标签名
 * @param {String} name 标签名
 * @private
 */
Parser.prototype.onTagName = function(name) {
	this.tagName = this.xml ? name : name.toLowerCase()
	if (this.tagName === 'svg') {
		this.xml = (this.xml || 0) + 1 // svg 标签内大小写敏感
	}
}

/**
 * @description 解析到属性名
 * @param {String} name 属性名
 * @private
 */
Parser.prototype.onAttrName = function(name) {
	name = this.xml ? name : name.toLowerCase()
	if (name.substr(0, 5) === 'data-') {
		if (name === 'data-src' && !this.attrs.src) {
			// data-src 自动转为 src
			this.attrName = 'src'
		} else if (this.tagName === 'img' || this.tagName === 'a') {
			// a 和 img 标签保留 data- 的属性，可以在 imgtap 和 linktap 事件中使用
			this.attrName = name
		} else {
			// 剩余的移除以减小大小
			this.attrName = undefined
		}
	} else {
		this.attrName = name
		this.attrs[name] = 'T' // boolean 型属性缺省设置
	}
}

/**
 * @description 解析到属性值
 * @param {String} val 属性值
 * @private
 */
Parser.prototype.onAttrVal = function(val) {
	// console.log(val, '解码转码')
	const name = this.attrName || ''
	if (name === 'style' || name === 'href') {
		// 部分属性进行实体解码
		this.attrs[name] = decodeEntity(val, true)
	} else if (name.includes('src')) {
		// 拼接主域名
		this.attrs[name] = this.getUrl(decodeEntity(val, true))
	} else if (name) {
		this.attrs[name] = val
	}
}

/**
 * @description 解析到标签开始
 * @param {Boolean} selfClose 是否有自闭合标识 />
 * @private
 */
Parser.prototype.onOpenTag = function(selfClose) {
	// 拼装 node
	const node = Object.create(null)
	node.name = this.tagName
	node.attrs = this.attrs
	// 避免因为自动 diff 使得 type 被设置为 null 导致部分内容不显示
	if (this.options.nodes.length) {
		node.type = 'node'
	}
	this.attrs = Object.create(null)

	const attrs = node.attrs
	const parent = this.stack[this.stack.length - 1]
	const siblings = parent ? parent.children : this.nodes
	const close = this.xml ? selfClose : config.voidTags[node.name]

	// 替换标签名选择器
	if (tagSelector[node.name]) {
		attrs.class = tagSelector[node.name] + (attrs.class ? ' ' + attrs.class : '')
	}

	// 转换 embed 标签
	if (node.name === 'embed') {
		// #ifndef H5 || APP-PLUS
		const src = attrs.src || ''
		// 按照后缀名和 type 将 embed 转为 video 或 audio
		if (src.includes('.mp4') || src.includes('.3gp') || src.includes('.m3u8') || (attrs.type || '').includes(
				'video')) {
			node.name = 'video'
		} else if (src.includes('.mp3') || src.includes('.wav') || src.includes('.aac') || src.includes('.m4a') || (
				attrs.type || '').includes('audio')) {
			node.name = 'audio'
		}
		if (attrs.autostart) {
			attrs.autoplay = 'T'
		}
		attrs.controls = 'T'
		// #endif
		// #ifdef H5 || APP-PLUS
		this.expose()
		// #endif
	}

	// #ifndef APP-PLUS-NVUE
	// 处理音视频
	if (node.name === 'video' || node.name === 'audio') {
		// 设置 id 以便获取 context
		if (node.name === 'video' && !attrs.id) {
			attrs.id = 'v' + idIndex++
		}
		// 没有设置 controls 也没有设置 autoplay 的自动设置 controls
		if (!attrs.controls && !attrs.autoplay) {
			attrs.controls = 'T'
		}
		// 用数组存储所有可用的 source
		node.src = []
		if (attrs.src) {
			node.src.push(attrs.src)
			attrs.src = undefined
		}
		this.expose()
	}
	// #endif

	// 处理自闭合标签
	if (close) {
		if (!this.hook(node) || config.ignoreTags[node.name]) {
			// 通过 base 标签设置主域名
			if (node.name === 'base' && !this.options.domain) {
				this.options.domain = attrs.href
			} /* #ifndef APP-PLUS-NVUE */
			else if (node.name === 'source' && parent && (parent.name === 'video' || parent.name === 'audio') &&
				attrs.src) {
				// 设置 source 标签（仅父节点为 video 或 audio 时有效）
				parent.src.push(attrs.src)
			} /* #endif */
			return
		}

		// 解析 style
		const styleObj = this.parseStyle(node)

		// 处理图片
		if (node.name === 'img') {
			if (attrs.src) {
				// 标记 webp
				if (attrs.src.includes('webp')) {
					node.webp = 'T'
				}
				// data url 图片如果没有设置 original-src 默认为不可预览的小图片
				if (attrs.src.includes('data:') && !attrs['original-src']) {
					attrs.ignore = 'T'
				}
				if (!attrs.ignore || node.webp || attrs.src.includes('cloud://')) {
					for (let i = this.stack.length; i--;) {
						const item = this.stack[i]
						if (item.name === 'a') {
							node.a = item.attrs
						}
						if (item.name === 'table' && !node.webp && !attrs.src.includes('cloud://')) {
							if (!styleObj.display || styleObj.display.includes('inline')) {
								node.t = 'inline-block'
							} else {
								node.t = styleObj.display
							}
							styleObj.display = undefined
						}
						// #ifndef H5 || APP-PLUS
						const style = item.attrs.style || ''
						if (style.includes('flex:') && !style.includes('flex:0') && !style.includes('flex: 0') && (!
								styleObj.width || parseInt(styleObj.width) > 100)) {
							styleObj.width = '100% !important'
							styleObj.height = ''
							for (let j = i + 1; j < this.stack.length; j++) {
								this.stack[j].attrs.style = (this.stack[j].attrs.style || '').replace('inline-', '')
							}
						} else if (style.includes('flex') && styleObj.width === '100%') {
							for (let j = i + 1; j < this.stack.length; j++) {
								const style = this.stack[j].attrs.style || ''
								if (!style.includes(';width') && !style.includes(' width') && style.indexOf(
										'width') !== 0) {
									styleObj.width = ''
									break
								}
							}
						} else if (style.includes('inline-block')) {
							if (styleObj.width && styleObj.width[styleObj.width.length - 1] === '%') {
								item.attrs.style += ';max-width:' + styleObj.width
								styleObj.width = ''
							} else {
								item.attrs.style += ';max-width:100%'
							}
						}
						// #endif
						item.c = 1
					}
					attrs.i = this.imgList.length.toString()
					let src = attrs['original-src'] || attrs.src
					// #ifndef H5 || MP-ALIPAY || APP-PLUS || MP-360
					if (this.imgList.includes(src)) {
						// 如果有重复的链接则对域名进行随机大小写变换避免预览时错位
						let i = src.indexOf('://')
						if (i !== -1) {
							i += 3
							let newSrc = src.substr(0, i)
							for (; i < src.length; i++) {
								if (src[i] === '/') break
								newSrc += Math.random() > 0.5 ? src[i].toUpperCase() : src[i]
							}
							newSrc += src.substr(i)
							src = newSrc
						}
					}
					// #endif
					this.imgList.push(src)
					if (!node.t) {
						this.imgList._unloadimgs += 1
					}
					// #ifdef H5 || APP-PLUS
					if (this.options.lazyLoad) {
						attrs['data-src'] = attrs.src
						attrs.src = undefined
					}
					// #endif
				}
			}
			if (styleObj.display === 'inline') {
				styleObj.display = ''
			}
			// #ifndef APP-PLUS-NVUE
			if (attrs.ignore) {
				styleObj['max-width'] = styleObj['max-width'] || '100%'
				attrs.style += ';-webkit-touch-callout:none'
			}
			// #endif
			// 设置的宽度超出屏幕，为避免变形，高度转为自动
			if (parseInt(styleObj.width) > windowWidth) {
				styleObj.height = undefined
			}
			// 记录是否设置了宽高
			if (!isNaN(parseInt(styleObj.width))) {
				node.w = 'T'
			}
			if (!isNaN(parseInt(styleObj.height)) && (!styleObj.height.includes('%') || (parent && (parent.attrs
					.style || '').includes('height')))) {
				node.h = 'T'
			}
		} else if (node.name === 'svg') {
			siblings.push(node)
			this.stack.push(node)
			this.popNode()
			return
		}
		for (const key in styleObj) {
			if (styleObj[key]) {
				attrs.style += `;${key}:${styleObj[key].replace(' !important', '')}`
			}
		}
		attrs.style = attrs.style.substr(1) || undefined
		// #ifdef (MP-WEIXIN || MP-QQ) && VUE3
		if (!attrs.style) {
			delete attrs.style
		}
		// #endif
	} else {
		if ((node.name === 'pre' || ((attrs.style || '').includes('white-space') && attrs.style.includes('pre'))) &&
			this.pre !== 2) {
			this.pre = node.pre = 1
		}
		node.children = []
		this.stack.push(node)
	}

	// 加入节点树
	siblings.push(node)
}

/**
 * @description 解析到标签结束
 * @param {String} name 标签名
 * @private
 */
Parser.prototype.onCloseTag = function(name) {
	// 依次出栈到匹配为止
	name = this.xml ? name : name.toLowerCase()
	let i
	for (i = this.stack.length; i--;) {
		if (this.stack[i].name === name) break
	}
	if (i !== -1) {
		while (this.stack.length > i) {
			this.popNode()
		}
	} else if (name === 'p' || name === 'br') {
		const siblings = this.stack.length ? this.stack[this.stack.length - 1].children : this.nodes
		siblings.push({
			name,
			attrs: {
				class: tagSelector[name] || '',
				style: this.tagStyle[name] || ''
			}
		})
	}
}

/**
 * @description 处理标签出栈
 * @private
 */
Parser.prototype.popNode = function() {
	const node = this.stack.pop()
	let attrs = node.attrs
	const children = node.children
	const parent = this.stack[this.stack.length - 1]
	const siblings = parent ? parent.children : this.nodes

	if (!this.hook(node) || config.ignoreTags[node.name]) {
		// 获取标题
		if (node.name === 'title' && children.length && children[0].type === 'text' && this.options.setTitle) {
			uni.setNavigationBarTitle({
				title: children[0].text
			})
		}
		siblings.pop()
		return
	}

	if (node.pre && this.pre !== 2) {
		// 是否合并空白符标识
		this.pre = node.pre = undefined
		for (let i = this.stack.length; i--;) {
			if (this.stack[i].pre) {
				this.pre = 1
			}
		}
	}

	const styleObj = {}

	// 转换 svg
	if (node.name === 'svg') {
		if (this.xml > 1) {
			// 多层 svg 嵌套
			this.xml--
			return
		}
		// #ifdef APP-PLUS-NVUE
		(function traversal(node) {
			if (node.name) {
				// 调整 svg 的大小写
				node.name = config.svgDict[node.name] || node.name
				for (const item in node.attrs) {
					if (config.svgDict[item]) {
						node.attrs[config.svgDict[item]] = node.attrs[item]
						node.attrs[item] = undefined
					}
				}
				for (let i = 0; i < (node.children || []).length; i++) {
					traversal(node.children[i])
				}
			}
		})(node)
		// #endif
		// #ifndef APP-PLUS-NVUE
		let src = ''
		const style = attrs.style
		attrs.style = ''
		attrs.xmlns = 'http://www.w3.org/2000/svg';
		(function traversal(node) {
			if (node.type === 'text') {
				src += node.text
				return
			}
			const name = config.svgDict[node.name] || node.name
			src += '<' + name
			for (const item in node.attrs) {
				const val = node.attrs[item]
				if (val) {
					src += ` ${config.svgDict[item] || item}="${val}"`
				}
			}
			if (!node.children) {
				src += '/>'
			} else {
				src += '>'
				for (let i = 0; i < node.children.length; i++) {
					traversal(node.children[i])
				}
				src += '</' + name + '>'
			}
		})(node)
		node.name = 'img'
		node.attrs = {
			src: 'data:image/svg+xml;utf8,' + src.replace(/#/g, '%23'),
			style,
			ignore: 'T'
		}
		node.children = undefined
		// #endif
		this.xml = false
		return
	}

	// #ifndef APP-PLUS-NVUE
	// 转换 align 属性
	if (attrs.align) {
		if (node.name === 'table') {
			if (attrs.align === 'center') {
				styleObj['margin-inline-start'] = styleObj['margin-inline-end'] = 'auto'
			} else {
				styleObj.float = attrs.align
			}
		} else {
			styleObj['text-align'] = attrs.align
		}
		attrs.align = undefined
	}

	// 转换 dir 属性
	if (attrs.dir) {
		styleObj.direction = attrs.dir
		attrs.dir = undefined
	}

	// 转换 font 标签的属性
	if (node.name === 'font') {
		if (attrs.color) {
			styleObj.color = attrs.color
			attrs.color = undefined
		}
		if (attrs.face) {
			styleObj['font-family'] = attrs.face
			attrs.face = undefined
		}
		if (attrs.size) {
			let size = parseInt(attrs.size)
			if (!isNaN(size)) {
				if (size < 1) {
					size = 1
				} else if (size > 7) {
					size = 7
				}
				styleObj['font-size'] = ['x-small', 'small', 'medium', 'large', 'x-large', 'xx-large', 'xxx-large'][
					size - 1
				]
			}
			attrs.size = undefined
		}
	}
	// #endif

	// 一些编辑器的自带 class
	if ((attrs.class || '').includes('align-center')) {
		styleObj['text-align'] = 'center'
	}

	Object.assign(styleObj, this.parseStyle(node))

	if (node.name !== 'table' && parseInt(styleObj.width) > windowWidth) {
		styleObj['max-width'] = '100%'
		styleObj['box-sizing'] = 'border-box'
	}

	// #ifndef APP-PLUS-NVUE
	if (config.blockTags[node.name]) {
		node.name = 'div'
	} else if (!config.trustTags[node.name] && !this.xml) {
		// 未知标签转为 span，避免无法显示
		node.name = 'span'
	}

	if (node.name === 'a' || node.name === 'ad'
		// #ifdef H5 || APP-PLUS
		||
		node.name === 'iframe' // eslint-disable-line
		// #endif
	) {
		this.expose()
	} else if (node.name === 'video') {
		if ((styleObj.height || '').includes('auto')) {
			styleObj.height = undefined
		}
		/* #ifdef APP-PLUS */
		let str = '<video style="width:100%;height:100%"'
		for (const item in attrs) {
			if (attrs[item]) {
				str += ' ' + item + '="' + attrs[item] + '"'
			}
		}
		if (this.options.pauseVideo) {
			str +=
				' onplay="this.dispatchEvent(new CustomEvent(\'vplay\',{bubbles:!0}));for(var e=document.getElementsByTagName(\'video\'),t=0;t<e.length;t++)e[t]!=this&&e[t].pause()"'
		}
		str += '>'
		for (let i = 0; i < node.src.length; i++) {
			str += '<source src="' + node.src[i] + '">'
		}
		str += '</video>'
		node.html = str
		/* #endif */
	} else if ((node.name === 'ul' || node.name === 'ol') && node.c) {
		// 列表处理
		const types = {
			a: 'lower-alpha',
			A: 'upper-alpha',
			i: 'lower-roman',
			I: 'upper-roman'
		}
		if (types[attrs.type]) {
			attrs.style += ';list-style-type:' + types[attrs.type]
			attrs.type = undefined
		}
		for (let i = children.length; i--;) {
			if (children[i].name === 'li') {
				children[i].c = 1
			}
		}
	} else if (node.name === 'table') {
		// 表格处理
		// cellpadding、cellspacing、border 这几个常用表格属性需要通过转换实现
		let padding = parseFloat(attrs.cellpadding)
		let spacing = parseFloat(attrs.cellspacing)
		const border = parseFloat(attrs.border)
		const bordercolor = styleObj['border-color']
		const borderstyle = styleObj['border-style']
		if (node.c) {
			// padding 和 spacing 默认 2
			if (isNaN(padding)) {
				padding = 2
			}
			if (isNaN(spacing)) {
				spacing = 2
			}
		}
		if (border) {
			attrs.style += `;border:${border}px ${borderstyle || 'solid'} ${bordercolor || 'gray'}`
		}
		if (node.flag && node.c) {
			// 有 colspan 或 rowspan 且含有链接的表格通过 grid 布局实现
			styleObj.display = 'grid'
			if (spacing) {
				styleObj['grid-gap'] = spacing + 'px'
				styleObj.padding = spacing + 'px'
			} else if (border) {
				// 无间隔的情况下避免边框重叠
				attrs.style += ';border-left:0;border-top:0'
			}

			const width = [] // 表格的列宽
			const trList = [] // tr 列表
			const cells = [] // 保存新的单元格
			const map = {}; // 被合并单元格占用的格子

			(function traversal(nodes) {
				for (let i = 0; i < nodes.length; i++) {
					if (nodes[i].name === 'tr') {
						trList.push(nodes[i])
					} else {
						traversal(nodes[i].children || [])
					}
				}
			})(children)

			for (let row = 1; row <= trList.length; row++) {
				let col = 1
				for (let j = 0; j < trList[row - 1].children.length; j++) {
					const td = trList[row - 1].children[j]
					if (td.name === 'td' || td.name === 'th') {
						// 这个格子被上面的单元格占用，则列号++
						while (map[row + '.' + col]) {
							col++
						}
						let style = td.attrs.style || ''
						let start = style.indexOf('width') ? style.indexOf(';width') : 0
						// 提取出 td 的宽度
						if (start !== -1) {
							let end = style.indexOf(';', start + 6)
							if (end === -1) {
								end = style.length
							}
							if (!td.attrs.colspan) {
								width[col] = style.substring(start ? start + 7 : 6, end)
							}
							style = style.substr(0, start) + style.substr(end)
						}
						// 设置竖直对齐
						style += ';display:flex'
						start = style.indexOf('vertical-align')
						if (start !== -1) {
							const val = style.substr(start + 15, 10)
							if (val.includes('middle')) {
								style += ';align-items:center'
							} else if (val.includes('bottom')) {
								style += ';align-items:flex-end'
							}
						} else {
							style += ';align-items:center'
						}
						// 设置水平对齐
						start = style.indexOf('text-align')
						if (start !== -1) {
							const val = style.substr(start + 11, 10)
							if (val.includes('center')) {
								style += ';justify-content: center'
							} else if (val.includes('right')) {
								style += ';justify-content: right'
							}
						}
						style = (border ? `;border:${border}px ${borderstyle || 'solid'} ${bordercolor || 'gray'}` +
							(spacing ? '' : ';border-right:0;border-bottom:0') : '') + (padding ?
							`;padding:${padding}px` : '') + ';' + style
						// 处理列合并
						if (td.attrs.colspan) {
							style += `;grid-column-start:${col};grid-column-end:${col + parseInt(td.attrs.colspan)}`
							if (!td.attrs.rowspan) {
								style += `;grid-row-start:${row};grid-row-end:${row + 1}`
							}
							col += parseInt(td.attrs.colspan) - 1
						}
						// 处理行合并
						if (td.attrs.rowspan) {
							style += `;grid-row-start:${row};grid-row-end:${row + parseInt(td.attrs.rowspan)}`
							if (!td.attrs.colspan) {
								style += `;grid-column-start:${col};grid-column-end:${col + 1}`
							}
							// 记录下方单元格被占用
							for (let rowspan = 1; rowspan < td.attrs.rowspan; rowspan++) {
								for (let colspan = 0; colspan < (td.attrs.colspan || 1); colspan++) {
									map[(row + rowspan) + '.' + (col - colspan)] = 1
								}
							}
						}
						if (style) {
							td.attrs.style = style
						}
						cells.push(td)
						col++
					}
				}
				if (row === 1) {
					let temp = ''
					for (let i = 1; i < col; i++) {
						temp += (width[i] ? width[i] : 'auto') + ' '
					}
					styleObj['grid-template-columns'] = temp
				}
			}
			node.children = cells
		} else {
			// 没有使用合并单元格的表格通过 table 布局实现
			if (node.c) {
				styleObj.display = 'table'
			}
			if (!isNaN(spacing)) {
				styleObj['border-spacing'] = spacing + 'px'
			}
			if (border || padding) {
				// 遍历
				(function traversal(nodes) {
					for (let i = 0; i < nodes.length; i++) {
						const td = nodes[i]
						if (td.name === 'th' || td.name === 'td') {
							if (border) {
								td.attrs.style =
									`border:${border}px ${borderstyle || 'solid'} ${bordercolor || 'gray'};${td.attrs.style || ''}`
							}
							if (padding) {
								td.attrs.style = `padding:${padding}px;${td.attrs.style || ''}`
							}
						} else if (td.children) {
							traversal(td.children)
						}
					}
				})(children)
			}
		}
		// 给表格添加一个单独的横向滚动层
		if (this.options.scrollTable && !(attrs.style || '').includes('inline')) {
			const table = Object.assign({}, node)
			node.name = 'div'
			node.attrs = {
				style: 'overflow:auto'
			}
			node.children = [table]
			attrs = table.attrs
		}
	} else if ((node.name === 'td' || node.name === 'th') && (attrs.colspan || attrs.rowspan)) {
		for (let i = this.stack.length; i--;) {
			if (this.stack[i].name === 'table') {
				this.stack[i].flag = 1 // 指示含有合并单元格
				break
			}
		}
	} else if (node.name === 'ruby') {
		// 转换 ruby
		node.name = 'span'
		for (let i = 0; i < children.length - 1; i++) {
			if (children[i].type === 'text' && children[i + 1].name === 'rt') {
				children[i] = {
					name: 'div',
					attrs: {
						style: 'display:inline-block;text-align:center'
					},
					children: [{
						name: 'div',
						attrs: {
							style: 'font-size:50%;' + (children[i + 1].attrs.style || '')
						},
						children: children[i + 1].children
					}, children[i]]
				}
				children.splice(i + 1, 1)
			}
		}
	} else if (node.c) {
		(function traversal(node) {
			node.c = 2
			for (let i = node.children.length; i--;) {
				const child = node.children[i]
				// #ifdef (MP-WEIXIN || MP-QQ || APP-PLUS || MP-360) && VUE3
				if (child.name && (config.inlineTags[child.name] || ((child.attrs.style || '').includes(
						'inline') && child.children)) && !child.c) {
					traversal(child)
				}
				// #endif
				if (!child.c || child.name === 'table') {
					node.c = 1
				}
			}
		})(node)
	}

	if ((styleObj.display || '').includes('flex') && !node.c) {
		for (let i = children.length; i--;) {
			const item = children[i]
			if (item.f) {
				item.attrs.style = (item.attrs.style || '') + item.f
				item.f = undefined
			}
		}
	}
	// flex 布局时部分样式需要提取到 rich-text 外层
	const flex = parent && ((parent.attrs.style || '').includes('flex') || (parent.attrs.style || '').includes(
			'grid'))
		// #ifdef MP-WEIXIN
		// 检查基础库版本 virtualHost 是否可用
		&&
		!(node.c && wx.getNFCAdapter) // eslint-disable-line
		// #endif
		// #ifndef MP-WEIXIN || MP-QQ || MP-BAIDU || MP-TOUTIAO
		&&
		!node.c // eslint-disable-line
	// #endif
	if (flex) {
		node.f = ';max-width:100%'
	}

	if (children.length >= 50 && node.c && !(styleObj.display || '').includes('flex')) {
		mergeNodes(children)
	}
	// #endif

	for (const key in styleObj) {
		if (styleObj[key]) {
			const val = `;${key}:${styleObj[key].replace(' !important', '')}`
			/* #ifndef APP-PLUS-NVUE */
			if (flex && ((key.includes('flex') && key !== 'flex-direction') || key === 'align-self' || key.includes(
					'grid') || styleObj[key][0] === '-' || (key.includes('width') && val.includes('%')))) {
				node.f += val
				if (key === 'width') {
					attrs.style += ';width:100%'
				}
			} else /* #endif */ {
				attrs.style += val
			}
		}
	}
	attrs.style = attrs.style.substr(1) || undefined
	// #ifdef (MP-WEIXIN || MP-QQ) && VUE3
	for (const key in attrs) {
		if (!attrs[key]) {
			delete attrs[key]
		}
	}
	// #endif
}

/**
 * @description 解析到文本
 * @param {String} text 文本内容
 */
Parser.prototype.onText = function(text) {
	if (!this.pre) {
		// 合并空白符
		let trim = ''
		let flag
		for (let i = 0, len = text.length; i < len; i++) {
			if (!blankChar[text[i]]) {
				trim += text[i]
			} else {
				if (trim[trim.length - 1] !== ' ') {
					trim += ' '
				}
				if (text[i] === '\n' && !flag) {
					flag = true
				}
			}
		}
		// 去除含有换行符的空串
		if (trim === ' ') {
			if (flag) return
			// #ifdef VUE3
			else {
				const parent = this.stack[this.stack.length - 1]
				if (parent && parent.name[0] === 't') return
			}
			// #endif
		}
		text = trim
	}
	const node = Object.create(null)
	node.type = 'text'
	// #ifdef (MP-BAIDU || MP-ALIPAY || MP-TOUTIAO) && VUE3
	node.attrs = {}
	// #endif
	node.text = decodeEntity(text)
	if (this.hook(node)) {
		// #ifdef MP-WEIXIN
		if (this.options.selectable === 'force' && system.includes('iOS') && !uni.canIUse(
				'rich-text.user-select')) {
			this.expose()
		}
		// #endif
		const siblings = this.stack.length ? this.stack[this.stack.length - 1].children : this.nodes
		siblings.push(node)
	}
}

/**
 * @description html 词法分析器
 * @param {Object} handler 高层处理器
 */
function Lexer(handler) {
	this.handler = handler
}

/**
 * @description 执行解析
 * @param {String} content 要解析的文本
 */
Lexer.prototype.parse = function(content) {
	this.content = content || ''
	this.i = 0 // 标记解析位置
	this.start = 0 // 标记一个单词的开始位置
	this.state = this.text // 当前状态
	for (let len = this.content.length; this.i !== -1 && this.i < len;) {
		this.state()
	}
}

/**
 * @description 检查标签是否闭合
 * @param {String} method 如果闭合要进行的操作
 * @returns {Boolean} 是否闭合
 * @private
 */
Lexer.prototype.checkClose = function(method) {
	const selfClose = this.content[this.i] === '/'
	if (this.content[this.i] === '>' || (selfClose && this.content[this.i + 1] === '>')) {
		if (method) {
			this.handler[method](this.content.substring(this.start, this.i))
		}
		this.i += selfClose ? 2 : 1
		this.start = this.i
		this.handler.onOpenTag(selfClose)
		if (this.handler.tagName === 'script') {
			this.i = this.content.indexOf('</', this.i)
			if (this.i !== -1) {
				this.i += 2
				this.start = this.i
			}
			this.state = this.endTag
		} else {
			this.state = this.text
		}
		return true
	}
	return false
}

/**
 * @description 文本状态
 * @private
 */
Lexer.prototype.text = function() {
	this.i = this.content.indexOf('<', this.i) // 查找最近的标签
	if (this.i === -1) {
		// 没有标签了
		if (this.start < this.content.length) {
			this.handler.onText(this.content.substring(this.start, this.content.length))
		}
		return
	}
	const c = this.content[this.i + 1]
	if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
		// 标签开头
		if (this.start !== this.i) {
			this.handler.onText(this.content.substring(this.start, this.i))
		}
		this.start = ++this.i
		this.state = this.tagName
	} else if (c === '/' || c === '!' || c === '?') {
		if (this.start !== this.i) {
			this.handler.onText(this.content.substring(this.start, this.i))
		}
		const next = this.content[this.i + 2]
		if (c === '/' && ((next >= 'a' && next <= 'z') || (next >= 'A' && next <= 'Z'))) {
			// 标签结尾
			this.i += 2
			this.start = this.i
			this.state = this.endTag
			return
		}
		// 处理注释
		let end = '-->'
		if (c !== '!' || this.content[this.i + 2] !== '-' || this.content[this.i + 3] !== '-') {
			end = '>'
		}
		this.i = this.content.indexOf(end, this.i)
		if (this.i !== -1) {
			this.i += end.length
			this.start = this.i
		}
	} else {
		this.i++
	}
}

/**
 * @description 标签名状态
 * @private
 */
Lexer.prototype.tagName = function() {
	if (blankChar[this.content[this.i]]) {
		// 解析到标签名
		this.handler.onTagName(this.content.substring(this.start, this.i))
		while (blankChar[this.content[++this.i]]);
		if (this.i < this.content.length && !this.checkClose()) {
			this.start = this.i
			this.state = this.attrName
		}
	} else if (!this.checkClose('onTagName')) {
		this.i++
	}
}

/**
 * @description 属性名状态
 * @private
 */
Lexer.prototype.attrName = function() {
	let c = this.content[this.i]
	if (blankChar[c] || c === '=') {
		// 解析到属性名
		this.handler.onAttrName(this.content.substring(this.start, this.i))
		let needVal = c === '='
		const len = this.content.length
		while (++this.i < len) {
			c = this.content[this.i]
			if (!blankChar[c]) {
				if (this.checkClose()) return
				if (needVal) {
					// 等号后遇到第一个非空字符
					this.start = this.i
					this.state = this.attrVal
					return
				}
				if (this.content[this.i] === '=') {
					needVal = true
				} else {
					this.start = this.i
					this.state = this.attrName
					return
				}
			}
		}
	} else if (!this.checkClose('onAttrName')) {
		this.i++
	}
}

/**
 * @description 属性值状态
 * @private
 */
Lexer.prototype.attrVal = function() {
	const c = this.content[this.i]
	const len = this.content.length
	if (c === '"' || c === "'") {
		// 有冒号的属性
		this.start = ++this.i
		this.i = this.content.indexOf(c, this.i)
		if (this.i === -1) return
		this.handler.onAttrVal(this.content.substring(this.start, this.i))
	} else {
		// 没有冒号的属性
		for (; this.i < len; this.i++) {
			if (blankChar[this.content[this.i]]) {
				this.handler.onAttrVal(this.content.substring(this.start, this.i))
				break
			} else if (this.checkClose('onAttrVal')) return
		}
	}
	while (blankChar[this.content[++this.i]]);
	if (this.i < len && !this.checkClose()) {
		this.start = this.i
		this.state = this.attrName
	}
}

/**
 * @description 结束标签状态
 * @returns {String} 结束的标签名
 * @private
 */
Lexer.prototype.endTag = function() {
	const c = this.content[this.i]
	if (blankChar[c] || c === '>' || c === '/') {
		this.handler.onCloseTag(this.content.substring(this.start, this.i))
		if (c !== '>') {
			this.i = this.content.indexOf('>', this.i)
			if (this.i === -1) return
		}
		this.start = ++this.i
		this.state = this.text
	} else {
		this.i++
	}
}

export default Parser