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// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
import * as TextFormatting from './text_formatting.jsx';
import * as SyntaxHighlighting from './syntax_hightlighting.jsx';
import marked from 'marked';
import katex from 'katex';
import 'katex/dist/katex.min.css';
function markdownImageLoaded(image) {
image.style.height = 'auto';
}
window.markdownImageLoaded = markdownImageLoaded;
class MattermostMarkdownRenderer extends marked.Renderer {
constructor(options, formattingOptions = {}) {
super(options);
this.heading = this.heading.bind(this);
this.paragraph = this.paragraph.bind(this);
this.text = this.text.bind(this);
this.formattingOptions = formattingOptions;
}
code(code, language) {
let usedLanguage = language || '';
usedLanguage = usedLanguage.toLowerCase();
if (usedLanguage === 'tex' || usedLanguage === 'latex') {
try {
const html = katex.renderToString(code, {throwOnError: false, displayMode: true});
return '<div class="post-body--code tex">' + html + '</div>';
} catch (e) {
// fall through if latex parsing fails and handle below
}
}
// treat html as xml to prevent injection attacks
if (usedLanguage === 'html') {
usedLanguage = 'xml';
}
let className = 'post-code';
if (!usedLanguage) {
className += ' post-code--wrap';
}
let header = '';
if (SyntaxHighlighting.canHighlight(usedLanguage)) {
header = (
'<span class="post-code__language">' +
SyntaxHighlighting.getLanguageName(language) +
'</span>'
);
}
// if we have to apply syntax highlighting AND highlighting of search terms, create two copies
// of the code block, one with syntax highlighting applied and another with invisible text, but
// search term highlighting and overlap them
const content = SyntaxHighlighting.highlight(usedLanguage, code);
let searchedContent = '';
if (this.formattingOptions.searchTerm) {
const tokens = new Map();
let searched = TextFormatting.sanitizeHtml(code);
searched = TextFormatting.highlightSearchTerms(searched, tokens, this.formattingOptions.searchTerm);
if (tokens.size > 0) {
searched = TextFormatting.replaceTokens(searched, tokens);
searchedContent = (
'<div class="post-code__search-highlighting">' +
searched +
'</div>'
);
}
}
return (
'<div class="' + className + '">' +
header +
'<code class="hljs">' +
searchedContent +
content +
'</code>' +
'</div>'
);
}
codespan(text) {
let output = text;
if (this.formattingOptions.searchTerm) {
const tokens = new Map();
output = TextFormatting.highlightSearchTerms(output, tokens, this.formattingOptions.searchTerm);
output = TextFormatting.replaceTokens(output, tokens);
}
return (
'<span class="codespan__pre-wrap">' +
'<code>' +
output +
'</code>' +
'</span>'
);
}
br() {
if (this.formattingOptions.singleline) {
return ' ';
}
return super.br();
}
image(href, title, text) {
let out = '<img src="' + href + '" alt="' + text + '"';
if (title) {
out += ' title="' + title + '"';
}
out += ' onload="window.markdownImageLoaded(this)" onerror="window.markdownImageLoaded(this)" class="markdown-inline-img"';
out += this.options.xhtml ? '/>' : '>';
return out;
}
heading(text, level, raw) {
const id = `${this.options.headerPrefix}${raw.toLowerCase().replace(/[^\w]+/g, '-')}`;
return `<h${level} id="${id}" class="markdown__heading">${text}</h${level}>`;
}
link(href, title, text) {
let outHref = href;
try {
const unescaped = decodeURIComponent(unescape(href)).replace(/[^\w:]/g, '').toLowerCase();
if (unescaped.indexOf('javascript:') === 0 || unescaped.indexOf('vbscript:') === 0 || unescaped.indexOf('data:') === 0) { // eslint-disable-line no-script-url
return '';
}
} catch (e) {
return '';
}
if (!(/[a-z+.-]+:/i).test(outHref)) {
outHref = `http://${outHref}`;
}
let output = '<a class="theme markdown__link" href="' + outHref + '" rel="noreferrer"';
// special case for links that are inside the app
if (outHref.startsWith(global.location.origin)) {
output += ' data-link="' + outHref.substring(global.location.origin.length) + '"';
} else {
output += ' target="_blank"';
}
if (title) {
output += ' title="' + title + '"';
}
// remove any links added to the text by hashtag or mention parsing since they'll break this link
output += '>' + text.replace(/<\/?a[^>]*>/g, '') + '</a>';
return output;
}
paragraph(text) {
if (this.formattingOptions.singleline) {
return `<p class="markdown__paragraph-inline">${text}</p>`;
}
return super.paragraph(text);
}
table(header, body) {
return `<div class="table-responsive"><table class="markdown__table"><thead>${header}</thead><tbody>${body}</tbody></table></div>`;
}
listitem(text, bullet) {
const taskListReg = /^\[([ |xX])\] /;
const isTaskList = taskListReg.exec(text);
if (isTaskList) {
return `<li class="list-item--task-list">${'<input type="checkbox" disabled="disabled" ' + (isTaskList[1] === ' ' ? '' : 'checked="checked" ') + '/> '}${text.replace(taskListReg, '')}</li>`;
}
if (/^\d+.$/.test(bullet)) {
// this is a numbered list item so override the numbering
return `<li value="${parseInt(bullet, 10)}">${text}</li>`;
}
return `<li>${text}</li>`;
}
text(txt) {
return TextFormatting.doFormatText(txt, this.formattingOptions);
}
}
export function format(text, options) {
const markdownOptions = {
renderer: new MattermostMarkdownRenderer(null, options),
sanitize: true,
gfm: true,
tables: true
};
return marked(text, markdownOptions);
}
// Marked helper functions that should probably just be exported
function unescape(html) {
return html.replace(/&([#\w]+);/g, (_, m) => {
const n = m.toLowerCase();
if (n === 'colon') {
return ':';
} else if (n.charAt(0) === '#') {
return n.charAt(1) === 'x' ?
String.fromCharCode(parseInt(n.substring(2), 16)) :
String.fromCharCode(+n.substring(1));
}
return '';
});
}
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