pco/app/uview-ui/components/u-parse/parser.js

'use strict'

/**
 * @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'),
    // 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: '…'
    },
    // 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',
        u: 'text-decoration:underline' // #endif

    }
}
const {windowWidth} = uni.getSystemInfoSync()
const blankChar = makeMap(' ,\r,\n,\t,\f')
let idIndex = 0 // #ifdef H5 || APP-PLUS

config.ignoreTags.iframe = void 0
config.trustTags.iframe = true
config.ignoreTags.embed = void 0
config.trustTags.embed = true // #endif
// #ifdef APP-PLUS-NVUE

config.ignoreTags.source = void 0
config.ignoreTags.style = void 0 // #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 = void 0
        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 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.plugins = vm.plugins || []
    this.attrs = Object.create(null)
    this.stack = []
    this.nodes = []
}

/**
 * @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()
    }

    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.name == 'a' || item.c) 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

    if (url[0] == '/') {
        // // 开头的补充协议名
        if (url[1] == '/') url = `${domain ? domain.split('://')[0] : 'http'}:${url}` // 否则补充整个域名
        else if (domain) url = domain + url
    } else if (domain && !url.includes('data:') && !url.includes('://')) url = `${domain}/${url}`

    return url
}
/**
 * @description 解析样式表
 * @param {Object} node 标签
 * @returns {Object}
 */

parser.prototype.parseStyle = function (node) {
    const {attrs} = node
    const list = (this.tagStyle[node.name] || '').split(';').concat((attrs.style || '').split(';'))
    const styleObj = {}
    let tmp = ''

    if (attrs.id) {
        // 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 = void 0
    } // 转换 width 和 height 属性

    if (attrs.width) {
        styleObj.width = parseFloat(attrs.width) + (attrs.width.includes('%') ? '%' : 'px')
        attrs.width = void 0
    }

    if (attrs.height) {
        styleObj.height = parseFloat(attrs.height) + (attrs.height.includes('%') ? '%' : 'px')
        attrs.height = void 0
    }

    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() // 兼容性的 css 不压缩

        if (value[0] == '-' && value.lastIndexOf('-') > 0 || value.includes('safe')) tmp += ';'.concat(key, ':').concat(value) // 重复的样式进行覆盖
        else if (!styleObj[key] || value.includes('import') || !styleObj[key].includes('import')) {
            // 填充链接
            if (value.includes('url')) {
                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))
                }
            } // 转换 rpx（rich-text 内部不支持 rpx）
            else if (value.includes('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 = true // 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-') {
        // data-src 自动转为 src
        if (name == 'data-src' && !this.attrs.src) this.attrName = 'src' // a 和 img 标签保留 data- 的属性，可以在 imgtap 和 linktap 事件中使用
        else if (this.tagName == 'img' || this.tagName == 'a') this.attrName = name // 剩余的移除以减小大小
        else this.attrName = void 0
    } 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) {
    const name = this.attrName || '' // 部分属性进行实体解码

    if (name == 'style' || name == 'href') this.attrs[name] = decodeEntity(val, true) // 拼接主域名
    else if (name.includes('src')) 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
    this.attrs = Object.create(null)
    const {attrs} = node
    const parent = this.stack[this.stack.length - 1]
    const siblings = parent ? parent.children : this.nodes
    const close = this.xml ? selfClose : config.voidTags[node.name] // 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 = void 0
        }

        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
            // 设置 source 标签（仅父节点为 video 或 audio 时有效）
            else if (node.name == 'source' && parent && (parent.name == 'video' || parent.name == 'audio') && attrs.src) 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
                            break
                        } // #ifndef H5 || APP-PLUS

                        const style = item.attrs.style || ''

                        if (style.includes('flex:') && !style.includes('flex:0') && !style.includes('flex: 0') && (!styleObj.width || !styleObj.width.includes('%'))) {
                            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) // #ifdef H5 || APP-PLUS

                    if (this.options.lazyLoad) {
                        attrs['data-src'] = attrs.src
                        attrs.src = void 0
                    } // #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 = void 0 // 记录是否设置了宽高

            if (styleObj.width) {
                if (styleObj.width.includes('auto')) styleObj.width = ''; else {
                    node.w = 'T'
                    if (styleObj.height && !styleObj.height.includes('auto')) 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 += ';'.concat(key, ':').concat(styleObj[key].replace(' !important', ''))
        }

        attrs.style = attrs.style.substr(1) || void 0
    } else {
        if (node.name == 'pre' || (attrs.style || '').includes('white-space') && attrs.style.includes('pre')) this.pre = node.pre = true
        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: {}
        })
    }
}
/**
 * @description 处理标签出栈
 * @private
 */

parser.prototype.popNode = function () {
    const node = this.stack.pop()
    let {attrs} = node
    const {children} = node
    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) {
        // 是否合并空白符标识
        node.pre = this.pre = void 0

        for (let i = this.stack.length; i--;) {
            if (this.stack[i].pre) this.pre = true
        }
    }

    const styleObj = {} // 转换 svg

    if (node.name == 'svg') {
        // #ifndef APP-PLUS-NVUE
        let src = ''
        const {style} = attrs
        attrs.style = ''
        attrs.xmlns = 'http://www.w3.org/2000/svg';

        (function traversal(node) {
            src += `<${node.name}`

            for (let item in node.attrs) {
                const val = node.attrs[item]

                if (val) {
                    if (item == 'viewbox') item = 'viewBox'
                    src += ' '.concat(item, '="').concat(val, '"')
                }
            }

            if (!node.children) src += '/>'; else {
                src += '>'

                for (let _i2 = 0; _i2 < node.children.length; _i2++) {
                    traversal(node.children[_i2])
                }

                src += `</${node.name}>`
            }
        }(node))

        node.name = 'img'
        node.attrs = {
            src: `data:image/svg+xml;utf8,${src.replace(/#/g, '%23')}`,
            style,
            ignore: 'T'
        }
        node.children = void 0 // #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 = void 0
    } // 转换 font 标签的属性

    if (node.name == 'font') {
        if (attrs.color) {
            styleObj.color = attrs.color
            attrs.color = void 0
        }

        if (attrs.face) {
            styleObj['font-family'] = attrs.face
            attrs.face = void 0
        }

        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'] = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'][size - 1]
            }

            attrs.size = void 0
        }
    } // #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 (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' // 未知标签转为 span，避免无法显示
    else if (!config.trustTags[node.name] && !this.xml) node.name = 'span'
    if (node.name == 'a' || node.name == 'ad' // #ifdef H5 || APP-PLUS
        || node.name == 'iframe' // #endif
    ) this.expose() // #ifdef APP-PLUS
    else if (node.name == 'video') {
        let str = '<video style="width:100%;height:100%"' // 空白图占位

        if (!attrs.poster && !attrs.autoplay) attrs.poster = "data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'/>"

        for (const item in attrs) {
            if (attrs[item]) str += ` ${item}="${attrs[item]}"`
        }

        if (this.options.pauseVideo) str += ' onplay="for(var e=document.getElementsByTagName(\'video\'),t=0;t<e.length;t++)e[t]!=this&&e[t].pause()"'
        str += '>'

        for (let _i3 = 0; _i3 < node.src.length; _i3++) {
            str += `<source src="${node.src[_i3]}">`
        }

        str += '</video>'
        node.html = str
    } // #endif
    // 列表处理
    else if ((node.name == 'ul' || node.name == 'ol') && node.c) {
        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 = void 0
        }

        for (let _i4 = children.length; _i4--;) {
            if (children[_i4].name == 'li') children[_i4].c = 1
        }
    } // 表格处理
    else if (node.name == 'table') {
        // 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)

        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 solid 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`
            } // 无间隔的情况下避免边框重叠
            else if (border) 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 _i5 = 0; _i5 < nodes.length; _i5++) {
                    if (nodes[_i5].name == 'tr') trList.push(nodes[_i5]); else traversal(nodes[_i5].children || [])
                }
            }(children))

            for (let row = 1; row <= trList.length; row++) {
                let col = 1

                for (let j = 0; j < trList[row - 1].children.length; j++, col++) {
                    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 _style2 = td.attrs.style || ''
                        const start = _style2.indexOf('width') ? _style2.indexOf(';width') : 0 // 提取出 td 的宽度

                        if (start != -1) {
                            let end = _style2.indexOf(';', start + 6)

                            if (end == -1) end = _style2.length
                            if (!td.attrs.colspan) width[col] = _style2.substring(start ? start + 7 : 6, end)
                            _style2 = _style2.substr(0, start) + _style2.substr(end)
                        }

                        _style2 += (border ? ';border:'.concat(border, 'px solid gray') + (spacing ? '' : ';border-right:0;border-bottom:0') : '') + (padding ? ';padding:'.concat(padding, 'px') : '') // 处理列合并

                        if (td.attrs.colspan) {
                            _style2 += ';grid-column-start:'.concat(col, ';grid-column-end:').concat(col + parseInt(td.attrs.colspan))
                            if (!td.attrs.rowspan) _style2 += ';grid-row-start:'.concat(row, ';grid-row-end:').concat(row + 1)
                            col += parseInt(td.attrs.colspan) - 1
                        } // 处理行合并

                        if (td.attrs.rowspan) {
                            _style2 += ';grid-row-start:'.concat(row, ';grid-row-end:').concat(row + parseInt(td.attrs.rowspan))
                            if (!td.attrs.colspan) _style2 += ';grid-column-start:'.concat(col, ';grid-column-end:').concat(col + 1) // 记录下方单元格被占用

                            for (let k = 1; k < td.attrs.rowspan; k++) {
                                map[`${row + k}.${col}`] = 1
                            }
                        }

                        if (_style2) td.attrs.style = _style2
                        cells.push(td)
                    }
                }

                if (row == 1) {
                    let temp = ''

                    for (let _i6 = 1; _i6 < col; _i6++) {
                        temp += `${width[_i6] ? width[_i6] : '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 _i7 = 0; _i7 < nodes.length; _i7++) {
                        const _td = nodes[_i7]

                        if (_td.name == 'th' || _td.name == 'td') {
                            if (border) _td.attrs.style = 'border:'.concat(border, 'px solid gray;').concat(_td.attrs.style || '')
                            if (padding) _td.attrs.style = 'padding:'.concat(padding, 'px;').concat(_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 = {...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 _i8 = this.stack.length; _i8--;) {
            if (this.stack[_i8].name == 'table') {
                this.stack[_i8].flag = 1 // 指示含有合并单元格

                break
            }
        }
    } // 转换 ruby
    else if (node.name == 'ruby') {
        node.name = 'span'

        for (let _i9 = 0; _i9 < children.length - 1; _i9++) {
            if (children[_i9].type == 'text' && children[_i9 + 1].name == 'rt') {
                children[_i9] = {
                    name: 'div',
                    attrs: {
                        style: 'display:inline-block'
                    },
                    children: [{
                        name: 'div',
                        attrs: {
                            style: 'font-size:50%;text-align:start'
                        },
                        children: children[_i9 + 1].children
                    }, children[_i9]]
                }
                children.splice(_i9 + 1, 1)
            }
        }
    } else if (node.c) {
        node.c = 2

        for (let _i10 = node.children.length; _i10--;) {
            if (!node.children[_i10].c || node.children[_i10].name == 'table') node.c = 1
        }
    }
    if ((styleObj.display || '').includes('flex') && !node.c) {
        for (let _i11 = children.length; _i11--;) {
            const _item = children[_i11]

            if (_item.f) {
                _item.attrs.style = (_item.attrs.style || '') + _item.f
                _item.f = void 0
            }
        }
    } // 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') // #ifdef MP-WEIXIN
        // 检查基础库版本 virtualHost 是否可用
        && !(node.c && wx.getNFCAdapter) // #endif
        // #ifndef MP-WEIXIN || MP-QQ || MP-BAIDU || MP-TOUTIAO
        && !node.c // #endif

    if (flex) node.f = ';max-width:100%' // #endif

    for (const key in styleObj) {
        if (styleObj[key]) {
            const val = ';'.concat(key, ':').concat(styleObj[key].replace(' !important', '')) // #ifndef APP-PLUS-NVUE

            if (flex && (key.includes('flex') && key != 'flex-direction' || key == 'align-self' || styleObj[key][0] == '-' || key == 'width' && val.includes('%'))) {
                node.f += val
                if (key == 'width') attrs.style += ';width:100%'
            } else // #endif
            {
                attrs.style += val
            }
        }
    }

    attrs.style = attrs.style.substr(1) || void 0
}
/**
 * @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 == ' ' && flag) return
        text = trim
    }

    const node = Object.create(null)
    node.type = 'text'
    node.text = decodeEntity(text)

    if (this.hook(node)) {
        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
            return this.state = this.endTag
        } // 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
                    return this.state = this.attrVal
                }

                if (this.content[this.i] == '=') needVal = true; else {
                    this.start = this.i
                    return this.state = this.attrName
                }
            }
        }
    } 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 // 有冒号的属性

    if (c == '"' || c == "'") {
        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))
    } // 没有冒号的属性
    else {
        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++
}

module.exports = parser