294 lines
7.6 KiB
JavaScript
294 lines
7.6 KiB
JavaScript
const Renderer = require('./Renderer.js');
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const { defaults } = require('./defaults.js');
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const { inline } = require('./rules.js');
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const {
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findClosingBracket,
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escape
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} = require('./helpers.js');
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/**
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* Inline Lexer & Compiler
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*/
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module.exports = class InlineLexer {
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constructor(links, options) {
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this.options = options || defaults;
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this.links = links;
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this.rules = inline.normal;
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this.options.renderer = this.options.renderer || new Renderer();
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this.renderer = this.options.renderer;
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this.renderer.options = this.options;
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if (!this.links) {
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throw new Error('Tokens array requires a `links` property.');
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}
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if (this.options.pedantic) {
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this.rules = inline.pedantic;
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} else if (this.options.gfm) {
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if (this.options.breaks) {
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this.rules = inline.breaks;
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} else {
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this.rules = inline.gfm;
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}
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}
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}
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/**
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* Expose Inline Rules
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*/
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static get rules() {
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return inline;
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}
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/**
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* Static Lexing/Compiling Method
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*/
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static output(src, links, options) {
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const inline = new InlineLexer(links, options);
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return inline.output(src);
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}
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/**
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* Lexing/Compiling
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*/
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output(src) {
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let out = '',
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link,
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text,
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href,
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title,
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cap,
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prevCapZero;
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while (src) {
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// escape
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if (cap = this.rules.escape.exec(src)) {
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src = src.substring(cap[0].length);
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out += escape(cap[1]);
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continue;
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}
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// tag
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if (cap = this.rules.tag.exec(src)) {
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if (!this.inLink && /^<a /i.test(cap[0])) {
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this.inLink = true;
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} else if (this.inLink && /^<\/a>/i.test(cap[0])) {
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this.inLink = false;
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}
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if (!this.inRawBlock && /^<(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
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this.inRawBlock = true;
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} else if (this.inRawBlock && /^<\/(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
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this.inRawBlock = false;
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}
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src = src.substring(cap[0].length);
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out += this.options.sanitize
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? this.options.sanitizer
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? this.options.sanitizer(cap[0])
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: escape(cap[0])
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: cap[0];
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continue;
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}
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// link
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if (cap = this.rules.link.exec(src)) {
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const lastParenIndex = findClosingBracket(cap[2], '()');
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if (lastParenIndex > -1) {
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const start = cap[0].indexOf('!') === 0 ? 5 : 4;
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const linkLen = start + cap[1].length + lastParenIndex;
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cap[2] = cap[2].substring(0, lastParenIndex);
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cap[0] = cap[0].substring(0, linkLen).trim();
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cap[3] = '';
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}
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src = src.substring(cap[0].length);
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this.inLink = true;
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href = cap[2];
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if (this.options.pedantic) {
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link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);
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if (link) {
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href = link[1];
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title = link[3];
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} else {
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title = '';
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}
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} else {
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title = cap[3] ? cap[3].slice(1, -1) : '';
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}
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href = href.trim().replace(/^<([\s\S]*)>$/, '$1');
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out += this.outputLink(cap, {
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href: InlineLexer.escapes(href),
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title: InlineLexer.escapes(title)
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});
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this.inLink = false;
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continue;
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}
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// reflink, nolink
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if ((cap = this.rules.reflink.exec(src))
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|| (cap = this.rules.nolink.exec(src))) {
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src = src.substring(cap[0].length);
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link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
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link = this.links[link.toLowerCase()];
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if (!link || !link.href) {
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out += cap[0].charAt(0);
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src = cap[0].substring(1) + src;
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continue;
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}
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this.inLink = true;
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out += this.outputLink(cap, link);
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this.inLink = false;
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continue;
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}
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// strong
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if (cap = this.rules.strong.exec(src)) {
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src = src.substring(cap[0].length);
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out += this.renderer.strong(this.output(cap[4] || cap[3] || cap[2] || cap[1]));
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continue;
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}
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// em
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if (cap = this.rules.em.exec(src)) {
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src = src.substring(cap[0].length);
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out += this.renderer.em(this.output(cap[6] || cap[5] || cap[4] || cap[3] || cap[2] || cap[1]));
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continue;
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}
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// code
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if (cap = this.rules.code.exec(src)) {
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src = src.substring(cap[0].length);
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out += this.renderer.codespan(escape(cap[2].trim(), true));
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continue;
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}
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// br
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if (cap = this.rules.br.exec(src)) {
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src = src.substring(cap[0].length);
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out += this.renderer.br();
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continue;
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}
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// del (gfm)
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if (cap = this.rules.del.exec(src)) {
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src = src.substring(cap[0].length);
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out += this.renderer.del(this.output(cap[1]));
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continue;
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}
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// autolink
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if (cap = this.rules.autolink.exec(src)) {
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src = src.substring(cap[0].length);
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if (cap[2] === '@') {
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text = escape(this.mangle(cap[1]));
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href = 'mailto:' + text;
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} else {
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text = escape(cap[1]);
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href = text;
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}
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out += this.renderer.link(href, null, text);
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continue;
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}
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// url (gfm)
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if (!this.inLink && (cap = this.rules.url.exec(src))) {
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if (cap[2] === '@') {
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text = escape(cap[0]);
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href = 'mailto:' + text;
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} else {
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// do extended autolink path validation
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do {
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prevCapZero = cap[0];
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cap[0] = this.rules._backpedal.exec(cap[0])[0];
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} while (prevCapZero !== cap[0]);
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text = escape(cap[0]);
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if (cap[1] === 'www.') {
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href = 'http://' + text;
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} else {
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href = text;
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}
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}
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src = src.substring(cap[0].length);
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out += this.renderer.link(href, null, text);
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continue;
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}
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// text
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if (cap = this.rules.text.exec(src)) {
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src = src.substring(cap[0].length);
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if (this.inRawBlock) {
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out += this.renderer.text(this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape(cap[0])) : cap[0]);
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} else {
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out += this.renderer.text(escape(this.smartypants(cap[0])));
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}
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continue;
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}
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if (src) {
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throw new Error('Infinite loop on byte: ' + src.charCodeAt(0));
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}
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}
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return out;
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}
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static escapes(text) {
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return text ? text.replace(InlineLexer.rules._escapes, '$1') : text;
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}
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/**
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* Compile Link
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*/
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outputLink(cap, link) {
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const href = link.href,
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title = link.title ? escape(link.title) : null;
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return cap[0].charAt(0) !== '!'
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? this.renderer.link(href, title, this.output(cap[1]))
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: this.renderer.image(href, title, escape(cap[1]));
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}
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/**
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* Smartypants Transformations
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*/
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smartypants(text) {
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if (!this.options.smartypants) return text;
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return text
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// em-dashes
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.replace(/---/g, '\u2014')
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// en-dashes
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.replace(/--/g, '\u2013')
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// opening singles
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.replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
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// closing singles & apostrophes
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.replace(/'/g, '\u2019')
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// opening doubles
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.replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
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// closing doubles
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.replace(/"/g, '\u201d')
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// ellipses
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.replace(/\.{3}/g, '\u2026');
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}
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/**
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* Mangle Links
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*/
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mangle(text) {
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if (!this.options.mangle) return text;
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const l = text.length;
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let out = '',
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i = 0,
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ch;
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for (; i < l; i++) {
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ch = text.charCodeAt(i);
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if (Math.random() > 0.5) {
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ch = 'x' + ch.toString(16);
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}
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out += '&#' + ch + ';';
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}
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return out;
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}
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};
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