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578 lines
18 KiB
JavaScript
578 lines
18 KiB
JavaScript
/*
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将 html 解析为适用于小程序 rich-text 的 DOM 结构
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github：https://github.com/jin-yufeng/Parser
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docs：https://jin-yufeng.github.io/Parser
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author：JinYufeng
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update：2020/04/13
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*/
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var cfg = require('./config.js'),
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blankChar = cfg.blankChar,
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CssHandler = require('./CssHandler.js'),
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{
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screenWidth,
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system
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} = wx.getSystemInfoSync();
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// #ifdef MP-BAIDU || MP-ALIPAY || MP-TOUTIAO
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var entities = {
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lt: '<',
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gt: '>',
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amp: '&',
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quot: '"',
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apos: "'",
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nbsp: '\xA0',
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ensp: '\u2002',
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emsp: '\u2003',
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ndash: '–',
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mdash: '—',
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middot: '·',
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lsquo: '‘',
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rsquo: '’',
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ldquo: '“',
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rdquo: '”',
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bull: '•',
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hellip: '…',
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permil: '‰',
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copy: '©',
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reg: '®',
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trade: '™',
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times: '×',
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divide: '÷',
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cent: '￠',
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pound: '£',
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yen: '¥',
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euro: '€',
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sect: '§'
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};
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// #endif
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var emoji; // emoji 补丁包 https://jin-yufeng.github.io/Parser/#/instructions?id=emoji
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class MpHtmlParser {
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constructor(data, options = {}) {
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this.attrs = {};
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this.compress = options.compress;
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this.CssHandler = new CssHandler(options.tagStyle, screenWidth);
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this.data = data;
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this.domain = options.domain;
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this.DOM = [];
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this.i = this.start = this.audioNum = this.imgNum = this.videoNum = 0;
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this.protocol = this.domain && this.domain.includes('://') ? this.domain.split('://')[0] : '';
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this.state = this.Text;
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this.STACK = [];
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this.useAnchor = options.useAnchor;
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this.xml = options.xml;
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}
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parse() {
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if (emoji) this.data = emoji.parseEmoji(this.data);
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for (var c; c = this.data[this.i]; this.i++)
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this.state(c);
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if (this.state == this.Text) this.setText();
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while (this.STACK.length) this.popNode(this.STACK.pop());
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// #ifdef MP-BAIDU || MP-TOUTIAO
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// 将顶层标签的一些样式提取出来给 rich-text
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(function f(ns) {
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for (var i = ns.length, n; n = ns[--i];) {
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if (n.type == 'text') continue;
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if (!n.c) {
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var style = n.attrs.style;
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if (style) {
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var j, k, res;
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if ((j = style.indexOf('display')) != -1)
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res = style.substring(j, (k = style.indexOf(';', j)) == -1 ? style.length : k);
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if ((j = style.indexOf('float')) != -1)
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res += ';' + style.substring(j, (k = style.indexOf(';', j)) == -1 ? style.length : k);
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n.attrs.contain = res;
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}
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} else f(n.children);
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}
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})(this.DOM);
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// #endif
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if (this.DOM.length) {
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this.DOM[0].PoweredBy = 'Parser';
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if (this.title) this.DOM[0].title = this.title;
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}
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return this.DOM;
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}
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// 设置属性
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setAttr() {
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var name = this.getName(this.attrName);
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if (cfg.trustAttrs[name]) {
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if (!this.attrVal) {
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if (cfg.boolAttrs[name]) this.attrs[name] = 'T';
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} else if (name == 'src') this.attrs[name] = this.getUrl(this.attrVal.replace(/&/g, '&'));
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else this.attrs[name] = this.attrVal;
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}
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this.attrVal = '';
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while (blankChar[this.data[this.i]]) this.i++;
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if (this.isClose()) this.setNode();
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else {
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this.start = this.i;
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this.state = this.AttrName;
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}
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}
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// 设置文本节点
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setText() {
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var back, text = this.section();
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if (!text) return;
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text = (cfg.onText && cfg.onText(text, () => back = true)) || text;
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if (back) {
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this.data = this.data.substr(0, this.start) + text + this.data.substr(this.i);
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let j = this.start + text.length;
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for (this.i = this.start; this.i < j; this.i++) this.state(this.data[this.i]);
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return;
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}
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if (!this.pre) {
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// 合并空白符
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var tmp = [];
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for (let i = text.length, c; c = text[--i];)
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if (!blankChar[c] || (!blankChar[tmp[0]] && (c = ' '))) tmp.unshift(c);
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text = tmp.join('');
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if (text == ' ') return;
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}
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// 处理实体
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var siblings = this.siblings(),
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i = -1,
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j, en;
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while (1) {
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if ((i = text.indexOf('&', i + 1)) == -1) break;
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if ((j = text.indexOf(';', i + 2)) == -1) break;
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if (text[i + 1] == '#') {
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en = parseInt((text[i + 2] == 'x' ? '0' : '') + text.substring(i + 2, j));
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if (!isNaN(en)) text = text.substr(0, i) + String.fromCharCode(en) + text.substring(j + 1);
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} else {
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en = text.substring(i + 1, j);
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// #ifdef MP-WEIXIN || MP-QQ || APP-PLUS
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if (en == 'nbsp') text = text.substr(0, i) + '\xA0' + text.substr(j + 1); // 解决 失效
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else if (en != 'lt' && en != 'gt' && en != 'amp' && en != 'ensp' && en != 'emsp' && en != 'quot' && en != 'apos') {
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i && siblings.push({
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type: 'text',
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text: text.substr(0, i)
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})
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siblings.push({
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type: 'text',
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text: `&${en};`,
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en: 1
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})
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text = text.substr(j + 1);
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i = -1;
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}
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// #endif
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// #ifdef MP-BAIDU || MP-ALIPAY || MP-TOUTIAO
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if (entities[en]) text = text.substr(0, i) + entities[en] + text.substr(j + 1);
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// #endif
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}
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}
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text && siblings.push({
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type: 'text',
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text
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})
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}
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// 设置元素节点
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setNode() {
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var node = {
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name: this.tagName.toLowerCase(),
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attrs: this.attrs
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},
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close = cfg.selfClosingTags[node.name] || (this.xml && this.data[this.i] == '/');
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this.attrs = {};
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if (!cfg.ignoreTags[node.name]) {
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this.matchAttr(node);
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if (!close) {
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node.children = [];
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if (node.name == 'pre' && cfg.highlight) {
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this.remove(node);
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this.pre = node.pre = true;
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}
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this.siblings().push(node);
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this.STACK.push(node);
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} else if (!cfg.filter || cfg.filter(node, this) != false)
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this.siblings().push(node);
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} else {
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if (!close) this.remove(node);
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else if (node.name == 'source') {
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var parent = this.STACK[this.STACK.length - 1],
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attrs = node.attrs;
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if (parent && attrs.src)
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if (parent.name == 'video' || parent.name == 'audio')
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parent.attrs.source.push(attrs.src);
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else {
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var i, media = attrs.media;
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if (parent.name == 'picture' && !parent.attrs.src && !(attrs.src.indexOf('.webp') && system.includes('iOS')) &&
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(!media || (media.includes('px') &&
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(((i = media.indexOf('min-width')) != -1 && (i = media.indexOf(':', i + 8)) != -1 && screenWidth > parseInt(
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media.substr(i + 1))) ||
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((i = media.indexOf('max-width')) != -1 && (i = media.indexOf(':', i + 8)) != -1 && screenWidth < parseInt(
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media.substr(i + 1)))))))
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parent.attrs.src = attrs.src;
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}
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} else if (node.name == 'base' && !this.domain) this.domain = node.attrs.href;
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}
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if (this.data[this.i] == '/') this.i++;
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this.start = this.i + 1;
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this.state = this.Text;
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}
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// 移除标签
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remove(node) {
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var name = node.name,
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j = this.i;
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while (1) {
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if ((this.i = this.data.indexOf('</', this.i + 1)) == -1) {
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if (name == 'pre' || name == 'svg') this.i = j;
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else this.i = this.data.length;
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return;
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}
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this.start = (this.i += 2);
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while (!blankChar[this.data[this.i]] && !this.isClose()) this.i++;
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if (this.getName(this.section()) == name) {
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// 代码块高亮
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if (name == 'pre') {
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this.data = this.data.substr(0, j + 1) + cfg.highlight(this.data.substring(j + 1, this.i - 5), node.attrs) +
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this.data.substr(this.i - 5);
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return this.i = j;
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} else if (name == 'style')
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this.CssHandler.getStyle(this.data.substring(j + 1, this.i - 7));
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else if (name == 'title')
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this.title = this.data.substring(j + 1, this.i - 7);
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if ((this.i = this.data.indexOf('>', this.i)) == -1) this.i = this.data.length;
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// 处理 svg
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if (name == 'svg') {
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var src = this.data.substring(j, this.i + 1);
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if (!node.attrs.xmlns) src = ' xmlns="http://www.w3.org/2000/svg"' + src;
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var i = j;
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while (this.data[j] != '<') j--;
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src = this.data.substring(j, i) + src;
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var parent = this.STACK[this.STACK.length - 1];
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if (node.attrs.width == '100%' && parent && (parent.attrs.style || '').includes('inline'))
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parent.attrs.style = 'width:300px;max-width:100%;' + parent.attrs.style;
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this.siblings().push({
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name: 'img',
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attrs: {
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src: 'data:image/svg+xml;utf8,' + src.replace(/#/g, '%23'),
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ignore: 'T'
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}
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})
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}
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return;
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}
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}
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}
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// 处理属性
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matchAttr(node) {
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var attrs = node.attrs,
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style = this.CssHandler.match(node.name, attrs, node) + (attrs.style || ''),
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styleObj = {};
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if (attrs.id) {
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if (this.compress & 1) attrs.id = void 0;
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else if (this.useAnchor) this.bubble();
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}
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if ((this.compress & 2) && attrs.class) attrs.class = void 0;
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switch (node.name) {
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case 'img':
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if (attrs['data-src']) {
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attrs.src = attrs.src || attrs['data-src'];
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attrs['data-src'] = void 0;
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}
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if (attrs.src && !attrs.ignore) {
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if (this.bubble()) attrs.i = (this.imgNum++).toString();
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else attrs.ignore = 'T';
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}
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break;
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case 'a':
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case 'ad':
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// #ifdef APP-PLUS
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case 'iframe':
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case 'embed':
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// #endif
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this.bubble();
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break;
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case 'font':
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if (attrs.color) {
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styleObj['color'] = attrs.color;
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attrs.color = void 0;
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}
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if (attrs.face) {
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styleObj['font-family'] = attrs.face;
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attrs.face = void 0;
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}
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if (attrs.size) {
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var size = parseInt(attrs.size);
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if (size < 1) size = 1;
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else if (size > 7) size = 7;
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var map = ['xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'];
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styleObj['font-size'] = map[size - 1];
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attrs.size = void 0;
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}
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break;
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case 'video':
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case 'audio':
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if (!attrs.id) attrs.id = node.name + (++this[`${node.name}Num`]);
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else this[`${node.name}Num`]++;
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if (node.name == 'video') {
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if (attrs.width) {
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style = `width:${parseFloat(attrs.width) + (attrs.width.includes('%') ? '%' : 'px')};${style}`;
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attrs.width = void 0;
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}
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if (attrs.height) {
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style = `height:${parseFloat(attrs.height) + (attrs.height.includes('%') ? '%' : 'px')};${style}`;
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attrs.height = void 0;
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}
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if (this.videoNum > 3) node.lazyLoad = true;
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}
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attrs.source = [];
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if (attrs.src) attrs.source.push(attrs.src);
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if (!attrs.controls && !attrs.autoplay)
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console.warn(`存在没有 controls 属性的 ${node.name} 标签，可能导致无法播放`, node);
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this.bubble();
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break;
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case 'td':
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case 'th':
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if (attrs.colspan || attrs.rowspan)
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for (var k = this.STACK.length, item; item = this.STACK[--k];)
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if (item.name == 'table') {
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item.c = void 0;
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break;
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}
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}
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if (attrs.align) {
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styleObj['text-align'] = attrs.align;
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attrs.align = void 0;
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}
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// 压缩 style
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var styles = style.replace(/"/g, '"').replace(/&/g, '&').split(';');
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style = '';
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for (var i = 0, len = styles.length; i < len; i++) {
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var info = styles[i].split(':');
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if (info.length < 2) continue;
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let key = info[0].trim().toLowerCase(),
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value = info.slice(1).join(':').trim();
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if (value.includes('-webkit') || value.includes('-moz') || value.includes('-ms') || value.includes('-o') || value
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.includes(
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'safe'))
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style += `;${key}:${value}`;
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else if (!styleObj[key] || value.includes('import') || !styleObj[key].includes('import'))
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styleObj[key] = value;
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}
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if (node.name == 'img' && parseInt(styleObj.width || attrs.width) > screenWidth)
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styleObj.height = 'auto';
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for (var key in styleObj) {
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var value = styleObj[key];
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if (key.includes('flex') || key == 'order' || key == 'self-align') node.c = 1;
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// 填充链接
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if (value.includes('url')) {
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var j = value.indexOf('(');
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if (j++ != -1) {
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while (value[j] == '"' || value[j] == "'" || blankChar[value[j]]) j++;
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value = value.substr(0, j) + this.getUrl(value.substr(j));
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}
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}
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// 转换 rpx
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else if (value.includes('rpx'))
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value = value.replace(/[0-9.]+\s*rpx/g, $ => parseFloat($) * screenWidth / 750 + 'px');
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else if (key == 'white-space' && value.includes('pre'))
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this.pre = node.pre = true;
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style += `;${key}:${value}`;
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}
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style = style.substr(1);
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if (style) attrs.style = style;
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}
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// 节点出栈处理
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popNode(node) {
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// 空白符处理
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if (node.pre) {
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node.pre = this.pre = void 0;
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for (let i = this.STACK.length; i--;)
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if (this.STACK[i].pre)
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this.pre = true;
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}
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if (node.name == 'head' || (cfg.filter && cfg.filter(node, this) == false))
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return this.siblings().pop();
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var attrs = node.attrs;
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// 替换一些标签名
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if (node.name == 'picture') {
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node.name = 'img';
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if (!attrs.src && (node.children[0] || '').name == 'img')
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attrs.src = node.children[0].attrs.src;
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if (attrs.src && !attrs.ignore)
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attrs.i = (this.imgNum++).toString();
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return node.children = void 0;
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}
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if (cfg.blockTags[node.name]) node.name = 'div';
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else if (!cfg.trustTags[node.name]) node.name = 'span';
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// 处理列表
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if (node.c) {
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if (node.name == 'ul') {
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var floor = 1;
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for (let i = this.STACK.length; i--;)
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if (this.STACK[i].name == 'ul') floor++;
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if (floor != 1)
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for (let i = node.children.length; i--;)
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node.children[i].floor = floor;
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} else if (node.name == 'ol') {
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for (let i = 0, num = 1, child; child = node.children[i++];)
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if (child.name == 'li') {
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child.type = 'ol';
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child.num = ((num, type) => {
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if (type == 'a') return String.fromCharCode(97 + (num - 1) % 26);
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if (type == 'A') return String.fromCharCode(65 + (num - 1) % 26);
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if (type == 'i' || type == 'I') {
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num = (num - 1) % 99 + 1;
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var one = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX'],
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ten = ['X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC'],
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res = (ten[Math.floor(num / 10) - 1] || '') + (one[num % 10 - 1] || '');
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if (type == 'i') return res.toLowerCase();
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return res;
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}
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return num;
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})(num++, attrs.type) + '.';
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}
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}
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}
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// 处理表格的边框
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if (node.name == 'table') {
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var padding = attrs.cellpadding,
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spacing = attrs.cellspacing,
|
||
border = attrs.border;
|
||
if (node.c) {
|
||
this.bubble();
|
||
if (!padding) padding = 2;
|
||
if (!spacing) spacing = 2;
|
||
}
|
||
if (border) attrs.style = `border:${border}px solid gray;${attrs.style || ''}`;
|
||
if (spacing) attrs.style = `border-spacing:${spacing}px;${attrs.style || ''}`;
|
||
if (border || padding)
|
||
(function f(ns) {
|
||
for (var i = 0, n; n = ns[i]; i++) {
|
||
if (n.name == 'th' || n.name == 'td') {
|
||
if (border) n.attrs.style = `border:${border}px solid gray;${n.attrs.style}`;
|
||
if (padding) n.attrs.style = `padding:${padding}px;${n.attrs.style}`;
|
||
} else f(n.children || []);
|
||
}
|
||
})(node.children)
|
||
}
|
||
this.CssHandler.pop && this.CssHandler.pop(node);
|
||
// 自动压缩
|
||
if (node.name == 'div' && !Object.keys(attrs).length) {
|
||
var siblings = this.siblings();
|
||
if (node.children.length == 1 && node.children[0].name == 'div')
|
||
siblings[siblings.length - 1] = node.children[0];
|
||
}
|
||
}
|
||
// 工具函数
|
||
bubble() {
|
||
for (var i = this.STACK.length, item; item = this.STACK[--i];) {
|
||
if (cfg.richOnlyTags[item.name]) {
|
||
if (item.name == 'table' && !Object.hasOwnProperty.call(item, 'c')) item.c = 1;
|
||
return false;
|
||
}
|
||
item.c = 1;
|
||
}
|
||
return true;
|
||
}
|
||
getName = val => this.xml ? val : val.toLowerCase();
|
||
getUrl(url) {
|
||
if (url[0] == '/') {
|
||
if (url[1] == '/') url = this.protocol + ':' + url;
|
||
else if (this.domain) url = this.domain + url;
|
||
} else if (this.domain && url.indexOf('data:') != 0 && !url.includes('://'))
|
||
url = this.domain + '/' + url;
|
||
return url;
|
||
}
|
||
isClose = () => this.data[this.i] == '>' || (this.data[this.i] == '/' && this.data[this.i + 1] == '>');
|
||
section = () => this.data.substring(this.start, this.i);
|
||
siblings = () => this.STACK.length ? this.STACK[this.STACK.length - 1].children : this.DOM;
|
||
// 状态机
|
||
Text(c) {
|
||
if (c == '<') {
|
||
var next = this.data[this.i + 1],
|
||
isLetter = c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
|
||
if (isLetter(next)) {
|
||
this.setText();
|
||
this.start = this.i + 1;
|
||
this.state = this.TagName;
|
||
} else if (next == '/') {
|
||
this.setText();
|
||
if (isLetter(this.data[++this.i + 1])) {
|
||
this.start = this.i + 1;
|
||
this.state = this.EndTag;
|
||
} else
|
||
this.Comment();
|
||
} else if (next == '!') {
|
||
this.setText();
|
||
this.Comment();
|
||
}
|
||
}
|
||
}
|
||
Comment() {
|
||
var key;
|
||
if (this.data.substring(this.i + 2, this.i + 4) == '--') key = '-->';
|
||
else if (this.data.substring(this.i + 2, this.i + 9) == '[CDATA[') key = ']]>';
|
||
else key = '>';
|
||
if ((this.i = this.data.indexOf(key, this.i + 2)) == -1) this.i = this.data.length;
|
||
else this.i += key.length - 1;
|
||
this.start = this.i + 1;
|
||
this.state = this.Text;
|
||
}
|
||
TagName(c) {
|
||
if (blankChar[c]) {
|
||
this.tagName = this.section();
|
||
while (blankChar[this.data[this.i]]) this.i++;
|
||
if (this.isClose()) this.setNode();
|
||
else {
|
||
this.start = this.i;
|
||
this.state = this.AttrName;
|
||
}
|
||
} else if (this.isClose()) {
|
||
this.tagName = this.section();
|
||
this.setNode();
|
||
}
|
||
}
|
||
AttrName(c) {
|
||
var blank = blankChar[c];
|
||
if (blank) {
|
||
this.attrName = this.section();
|
||
c = this.data[this.i];
|
||
}
|
||
if (c == '=') {
|
||
if (!blank) this.attrName = this.section();
|
||
while (blankChar[this.data[++this.i]]);
|
||
this.start = this.i--;
|
||
this.state = this.AttrValue;
|
||
} else if (blank) this.setAttr();
|
||
else if (this.isClose()) {
|
||
this.attrName = this.section();
|
||
this.setAttr();
|
||
}
|
||
}
|
||
AttrValue(c) {
|
||
if (c == '"' || c == "'") {
|
||
this.start++;
|
||
if ((this.i = this.data.indexOf(c, this.i + 1)) == -1) return this.i = this.data.length;
|
||
this.attrVal = this.section();
|
||
this.i++;
|
||
} else {
|
||
for (; !blankChar[this.data[this.i]] && !this.isClose(); this.i++);
|
||
this.attrVal = this.section();
|
||
}
|
||
this.setAttr();
|
||
}
|
||
EndTag(c) {
|
||
if (blankChar[c] || c == '>' || c == '/') {
|
||
var name = this.getName(this.section());
|
||
for (var i = this.STACK.length; i--;)
|
||
if (this.STACK[i].name == name) break;
|
||
if (i != -1) {
|
||
var node;
|
||
while ((node = this.STACK.pop()).name != name);
|
||
this.popNode(node);
|
||
} else if (name == 'p' || name == 'br')
|
||
this.siblings().push({
|
||
name,
|
||
attrs: {}
|
||
});
|
||
this.i = this.data.indexOf('>', this.i);
|
||
this.start = this.i + 1;
|
||
if (this.i == -1) this.i = this.data.length;
|
||
else this.state = this.Text;
|
||
}
|
||
}
|
||
}
|
||
module.exports = MpHtmlParser;
|