440 lines
16 KiB
JavaScript
440 lines
16 KiB
JavaScript
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/*
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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地址：https://github.com/jin-yufeng/Parser
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文档地址：https://jin-yufeng.github.io/Parser
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author：JinYufeng
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*/
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const CssHandler = require("./CssHandler.js");
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const config = require("./config.js");
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const blankChar = config.blankChar;
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var emoji; // 需要使用 emoji 补丁包时将此行改为 const emoji = require("./emoji.js");
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class MpHtmlParser {
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constructor(data, options = {}) {
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this.CssHandler = new CssHandler(options.tagStyle);
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this.data = data;
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this.DOM = [];
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// #ifdef MP-BAIDU || MP-TOUTIAO
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this._imgMode = options.imgMode;
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// #endif
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this._attrName = '';
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this._attrValue = '';
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this._attrs = {};
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this._domain = options.domain;
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this._protocol = options.domain && options.domain.includes("://") ? this._domain.split("://")[0] : "http";
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this._i = 0;
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this._sectionStart = 0;
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this._state = this.Text;
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this._STACK = [];
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this._tagName = '';
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this._audioNum = 0;
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this._imgNum = 0;
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this._videoNum = 0;
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this._useAnchor = options.useAnchor;
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this._whiteSpace = false;
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};
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parse() {
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if (this.CssHandler) this.data = this.CssHandler.getStyle(this.data);
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if (emoji) this.data = emoji.parseEmoji(this.data);
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// 高亮处理
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if (config.highlight)
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this.data = this.data.replace(/<[pP][rR][eE]([\s\S]*?)>([\s\S]*?)<\/[pP][rR][eE][\s\S]*?>/g, function($, $1, $2) {
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return "<pre" + $1 + '>' + config.highlight($2, "<pre" + $1 + '>') + "</pre>";
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})
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for (var len = this.data.length; this._i < len; this._i++)
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this._state(this.data[this._i]);
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if (this._state == this.Text) this.setText();
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while (this._STACK.length)
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this.popNode(this._STACK.pop());
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// #ifdef MP-BAIDU || MP-TOUTIAO
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const inlineTags = config.makeMap("abbr,b,big,code,del,em,font,i,ins,label,mark,q,s,small,span,strong,sub,sup,u")
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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 setContain(nodes) {
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for (var i = nodes.length, element; element = nodes[--i];) {
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if (element.type == "text")
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continue;
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if (!element.c) {
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var tmp, res = "",
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style = element.attrs.style;
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if (style) {
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style = style.toLowerCase();
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if (style.indexOf("float") != -1) res += style.match(/float[^;]+(?![\s\S]*?float)/)[0];
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if (style.indexOf("margin") != -1)
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element.attrs.style = style.replace(/margin[^;]+/g, function() {
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res += (';' + arguments[0]);
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if (arguments[0].includes("margin-top")) return "margin-top:0";
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if (arguments[0].includes("margin-bottom")) return "margin-bottom:0";
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if (!arguments[0].includes("margin-left") && !arguments[0].includes("margin-right")) return "margin:0";
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return '';
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});
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if (style.indexOf("display") != -1 && (tmp = style.match(/display\s*:\s*([^;]*)(?![\s\S]*?display)/),
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tmp[1].indexOf("flex") == -1)) res += (';' + tmp[0]);
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else if (inlineTags[element.name]) res += ";display:inline";
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else res += (";display:" + (element.name == 'img' ? 'inline-block' : 'block'));
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tmp = style.match(/flex[^;]*:[^;]+/g);
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if (tmp) res += (';' + tmp.join(';'));
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if (style.indexOf("width") != -1)
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element.attrs.style = style.replace(/width[^;]*?%/g, function() {
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res += (';' + arguments[0]);
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return "width:100%"
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})
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} else if (inlineTags[element.name]) res = "display:inline";
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else res = ("display:" + (element.name == 'img' ? 'inline-block' : 'block'));
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element.attrs.containStyle = res;
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} else setContain(element.children);
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}
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};
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setContain(this.DOM);
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// #endif
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if (this.DOM.length) this.DOM[0].PoweredBy = "Parser";
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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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if (config.trustAttrs[this._attrName]) {
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if (this._attrName == "src" && this._attrValue[0] == '/') {
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if (this._attrValue[1] == '/') this._attrValue = this._protocol + ':' + this._attrValue;
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else if (this._domain) this._attrValue = this._domain + this._attrValue;
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}
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this._attrs[this._attrName] = (this._attrValue ? this._attrValue : (this._attrName == "src" ? "" : "true"));
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}
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this._attrValue = '';
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while (blankChar[this.data[this._i]]) this._i++;
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if (this.checkClose()) this.setNode();
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else this._state = this.AttrName;
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};
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// 设置文本节点
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setText() {
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var text = this.getSelection();
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if (!text) return;
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if (!this._whiteSpace) {
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// 移除空白符
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for (var tmp = [], i = text.length, has = false, c; c = text[--i];)
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if ((!blankChar[c] && (has = true)) || (!blankChar[tmp[0]] && (c = ' '))) tmp.unshift(c);
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if (!has) return;
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text = tmp.join('');
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}
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// 处理实体
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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: "\u00A0",
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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 i = text.indexOf('&'),
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j, u, decode;
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while (i != -1) {
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j = text.indexOf(';', i + 2);
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if (j == -1) break;
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if (text[i + 1] == '#') {
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u = parseInt((text[i + 2] == 'x' ? '0' : '') + text.substring(i + 2, j));
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if (!isNaN(u)) text = text.substring(0, i) + String.fromCharCode(u) + text.substring(j + 1);
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} else {
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u = text.substring(i + 1, j);
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// #ifdef MP-WEIXIN || MP-QQ || APP-PLUS
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if (u == "nbsp") text = text.substring(0, i) + '\u00A0' + text.substring(j + 1); // 解决连续 失效的问题
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else if (u != "lt" && u != "gt" && u != "amp" && u != "ensp" && u != "emsp") decode = true;
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// #endif
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// #ifdef MP-BAIDU || MP-ALIPAY || MP-TOUTIAO
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if (entities[u]) text = text.substring(0, i) + entities[u] + text.substring(j + 1);
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// #endif
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}
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i = text.indexOf('&', i + 2);
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}
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var slibings = this._STACK.length ? this._STACK[this._STACK.length - 1].children : this.DOM;
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if (slibings.length && slibings[slibings.length - 1].type == "text") {
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slibings[slibings.length - 1].text += text;
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if (decode) slibings[slibings.length - 1].decode = true;
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} else
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slibings.push({
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type: "text",
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text,
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decode
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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 slibings = this._STACK.length ? this._STACK[this._STACK.length - 1].children : this.DOM;
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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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config.LabelAttrsHandler(node, this);
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this._attrs = {};
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if (this.data[this._i] == '>') {
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if (!config.selfClosingTags[this._tagName]) {
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if (config.ignoreTags[node.name]) {
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var j = this._i;
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// 处理要被移除的标签
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while (this._i < this.data.length) {
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(this._i = this.data.indexOf("</", this._i + 1)) == -1 ? this._i = this.data.length : null;
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this._i += 2;
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this._sectionStart = this._i;
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while (!blankChar[this.data[this._i]] && this.data[this._i] != '>' && this.data[this._i] != '/') this._i++;
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if (this.data.substring(this._sectionStart, this._i).toLowerCase() == node.name) {
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this._i = this.data.indexOf('>', this._i);
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if (this._i == -1) this._i = this.data.length;
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else this._sectionStart = this._i + 1;
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this._state = this.Text;
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// 处理svg
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if (node.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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this._i = j;
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while (this.data[j] != '<') j--;
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src = this.data.substring(j, this._i) + src;
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this._i = this._sectionStart - 1;
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node.name = "img";
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node.attrs = {
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src: "data:image/svg+xml;utf8," + src.replace(/#/g, "%23"),
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ignore: "true"
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}
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slibings.push(node);
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}
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break;
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}
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}
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return;
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} else this._STACK.push(node);
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node.children = [];
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}
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} else this._i++;
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this._sectionStart = this._i + 1;
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this._state = this.Text;
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if (!config.ignoreTags[node.name]) {
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// 检查空白符是否有效
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if (node.name == "pre" || (node.attrs.style && node.attrs.style.toLowerCase().includes("white-space") && node.attrs
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.style.toLowerCase().includes("pre"))) {
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this._whiteSpace = true;
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node.pre = true;
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}
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slibings.push(node);
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}
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};
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// 标签出栈处理
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popNode(node) {
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// 替换一些标签名
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if (config.blockTags[node.name]) node.name = 'div';
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else if (!config.trustTags[node.name]) node.name = 'span';
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// 空白符处理
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if (node.pre) {
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this._whiteSpace = false;
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node.pre = undefined;
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for (var i = this._STACK.length; i--;)
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if (this._STACK[i].pre)
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this._whiteSpace = true;
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}
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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 (var 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 (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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function convert(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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}
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for (var 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 = convert(num++, node.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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if (node.attrs.border)
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node.attrs.style = "border:" + node.attrs.border + "px solid gray;" + (node.attrs.style || '');
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if (node.attrs.hasOwnProperty("cellspacing"))
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node.attrs.style = "border-spacing:" + node.attrs.cellspacing + "px;" + (node.attrs.style || '');
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function setBorder(elem) {
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if (elem.name == 'th' || elem.name == 'td') {
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if (node.attrs.border)
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elem.attrs.style = "border:" + node.attrs.border + "px solid gray;" + (elem.attrs.style || '');
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if (node.attrs.hasOwnProperty("cellpadding"))
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elem.attrs.style = "padding:" + node.attrs.cellpadding + "px;" + (elem.attrs.style || '');
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return;
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}
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if (elem.type == 'text') return;
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for (var i = 0; i < (elem.children || []).length; i++)
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setBorder(elem.children[i]);
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}
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if (node.attrs.border || node.attrs.hasOwnProperty("cellpadding"))
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for (var i = 0; i < node.children.length; i++)
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setBorder(node.children[i]);
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}
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// 合并一些不必要的层，减小节点深度
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|
|
if (node.children.length == 1 && node.name == "div" && node.children[0].name == "div") {
|
|||
|
|
var child = node.children[0].attrs;
|
|||
|
|
node.attrs.style = node.attrs.style || '';
|
|||
|
|
child.style = child.style || '';
|
|||
|
|
if (node.attrs.style.includes("padding") && (node.attrs.style.includes("margin") || child.style.includes(
|
|||
|
|
"margin")) && node.attrs.style.includes("display") && child.style.includes("display") && !(node.attrs.id &&
|
|||
|
|
node.attrs.id) && !(node.attrs.class && child.class)) {
|
|||
|
|
if (child.style.includes("padding"))
|
|||
|
|
child.style = "box-sizing:border-box;" + child.style;
|
|||
|
|
node.attrs.style = node.attrs.style + ";" + child.style;
|
|||
|
|
node.attrs.id = (child.id || '') + (node.attrs.id || '');
|
|||
|
|
node.attrs.class = (child.class || '') + (node.attrs.class || '');
|
|||
|
|
node.children = child.children;
|
|||
|
|
} else if (!node.attrs.style) node.attrs.style = undefined;
|
|||
|
|
else if (!child.style) child.style = undefined;
|
|||
|
|
child = undefined;
|
|||
|
|
}
|
|||
|
|
// 多层样式处理
|
|||
|
|
if (this.CssHandler.pop)
|
|||
|
|
this.CssHandler.pop(node);
|
|||
|
|
};
|
|||
|
|
// 工具函数
|
|||
|
|
checkClose() {
|
|||
|
|
if (this.data[this._i] == '>' || (this.data[this._i] == '/' && this.data[this._i + 1] == '>'))
|
|||
|
|
return true;
|
|||
|
|
return false;
|
|||
|
|
};
|
|||
|
|
getSelection(trim) {
|
|||
|
|
var str = (this._sectionStart == this._i ? '' : this.data.substring(this._sectionStart, this._i));
|
|||
|
|
while (trim && (blankChar[this.data[++this._i]] || (this._i--, false)));
|
|||
|
|
this._sectionStart = this._i + 1;
|
|||
|
|
return str;
|
|||
|
|
};
|
|||
|
|
// 状态机
|
|||
|
|
Text(c) {
|
|||
|
|
if (c == '<') {
|
|||
|
|
var next = this.data[this._i + 1];
|
|||
|
|
if ((next >= 'a' && next <= 'z') || (next >= 'A' && next <= 'Z')) {
|
|||
|
|
this.setText();
|
|||
|
|
this._state = this.TagName;
|
|||
|
|
} else if (next == '/') {
|
|||
|
|
this.setText();
|
|||
|
|
this._i++;
|
|||
|
|
next = this.data[this._i + 1];
|
|||
|
|
if ((next >= 'a' && next <= 'z') || (next >= 'A' && next <= 'Z')) {
|
|||
|
|
this._sectionStart = this._i + 1;
|
|||
|
|
this._state = this.EndTag;
|
|||
|
|
} else
|
|||
|
|
this._state = this.Comment;
|
|||
|
|
} else if (next == '!') {
|
|||
|
|
this.setText();
|
|||
|
|
this._state = this.Comment;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
Comment() {
|
|||
|
|
if (this.data.substring(this._i + 1, this._i + 3) == "--" || this.data.substring(this._i + 1, this._i + 7) ==
|
|||
|
|
"[CDATA[") {
|
|||
|
|
this._i = this.data.indexOf("-->", this._i + 1);
|
|||
|
|
if (this._i == -1) return this._i = this.data.length;
|
|||
|
|
else this._i = this._i + 2;
|
|||
|
|
} else
|
|||
|
|
(this._i = this.data.indexOf(">", this._i + 1)) == -1 ? this._i = this.data.length : null;
|
|||
|
|
this._sectionStart = this._i + 1;
|
|||
|
|
this._state = this.Text;
|
|||
|
|
};
|
|||
|
|
TagName(c) {
|
|||
|
|
if (blankChar[c]) {
|
|||
|
|
this._tagName = this.getSelection(true);
|
|||
|
|
if (this.checkClose()) this.setNode();
|
|||
|
|
else this._state = this.AttrName;
|
|||
|
|
} else if (this.checkClose()) {
|
|||
|
|
this._tagName = this.getSelection();
|
|||
|
|
this.setNode();
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
AttrName(c) {
|
|||
|
|
if (blankChar[c]) {
|
|||
|
|
this._attrName = this.getSelection(true).toLowerCase();
|
|||
|
|
if (this.data[this._i] == '=') {
|
|||
|
|
while (blankChar[this.data[++this._i]]);
|
|||
|
|
this._sectionStart = this._i--;
|
|||
|
|
this._state = this.AttrValue;
|
|||
|
|
} else this.setAttr();
|
|||
|
|
} else if (c == '=') {
|
|||
|
|
this._attrName = this.getSelection().toLowerCase();
|
|||
|
|
while (blankChar[this.data[++this._i]]);
|
|||
|
|
this._sectionStart = this._i--;
|
|||
|
|
this._state = this.AttrValue;
|
|||
|
|
} else if (this.checkClose()) {
|
|||
|
|
this._attrName = this.getSelection().toLowerCase();
|
|||
|
|
this.setAttr();
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
AttrValue(c) {
|
|||
|
|
if (c == '"' || c == "'") {
|
|||
|
|
this._sectionStart++;
|
|||
|
|
if ((this._i = this.data.indexOf(c, this._i + 1)) == -1) return this._i = this.data.length;
|
|||
|
|
} else
|
|||
|
|
for (; !blankChar[this.data[this._i]] && this.data[this._i] != '>'; this._i++);
|
|||
|
|
this._attrValue = this.getSelection();
|
|||
|
|
while (this._attrValue.includes(""")) this._attrValue = this._attrValue.replace(""", '');
|
|||
|
|
this.setAttr();
|
|||
|
|
};
|
|||
|
|
EndTag(c) {
|
|||
|
|
if (blankChar[c] || c == '>' || c == '/') {
|
|||
|
|
var name = this.getSelection().toLowerCase();
|
|||
|
|
var flag = false;
|
|||
|
|
for (var i = this._STACK.length; i--;)
|
|||
|
|
if (this._STACK[i].name == name) {
|
|||
|
|
flag = true;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
if (flag) {
|
|||
|
|
var node;
|
|||
|
|
while (flag) {
|
|||
|
|
node = this._STACK.pop();
|
|||
|
|
if (node.name == name) flag = false;
|
|||
|
|
this.popNode(node);
|
|||
|
|
}
|
|||
|
|
} else if (name == 'p' || name == "br") {
|
|||
|
|
var slibings = this._STACK.length ? this._STACK[this._STACK.length - 1].children : this.DOM;
|
|||
|
|
slibings.push({
|
|||
|
|
name,
|
|||
|
|
attrs: {}
|
|||
|
|
});
|
|||
|
|
}
|
|||
|
|
this._i = this.data.indexOf('>', this._i);
|
|||
|
|
if (this._i == -1) this._i = this.data.length;
|
|||
|
|
else this._state = this.Text;
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
module.exports = (data, options) => new MpHtmlParser(data, options).parse();
|