// Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
import * as TextFormatting from './text_formatting.jsx';
import * as syntaxHightlighting 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 '
' + html + '
';
} catch (e) {
// fall through if latex parsing fails and handle below
}
}
// treat html as xml to prevent injection attacks
if (usedLanguage === 'html') {
usedLanguage = 'xml';
}
return syntaxHightlighting.formatCode(usedLanguage, code);
}
codespan(text) {
return '' + super.codespan(text) + '';
}
br() {
if (this.formattingOptions.singleline) {
return ' ';
}
return super.br();
}
image(href, title, text) {
let out = '' : '>';
return out;
}
heading(text, level, raw) {
const id = `${this.options.headerPrefix}${raw.toLowerCase().replace(/[^\w]+/g, '-')}`;
return `${text}`;
}
link(href, title, text) {
let outHref = href;
try {
const unescaped = decodeURIComponent(unescape(href)).replace(/[^\w:]/g, '').toLowerCase();
if (unescaped.indexOf('javascript:') === 0 || unescaped.indexOf('vbscript:') === 0 || unescaped.indexOf('data:') === 0) { // eslint-disable-line no-script-url
return '';
}
} catch (e) {
return '';
}
if (!(/[a-z+.-]+:/i).test(outHref)) {
outHref = `http://${outHref}`;
}
let output = '' + text + '';
return output;
}
paragraph(text) {
if (this.formattingOptions.singleline) {
return `${text}
`;
}
return super.paragraph(text);
}
table(header, body) {
return ``;
}
listitem(text) {
const taskListReg = /^\[([ |xX])\] /;
const isTaskList = taskListReg.exec(text);
if (isTaskList) {
return `${' '}${text.replace(taskListReg, '')}`;
}
return `${text}`;
}
text(txt) {
return TextFormatting.doFormatText(txt, this.formattingOptions);
}
}
class MattermostLexer extends marked.Lexer {
token(originalSrc, top, bq) {
let src = originalSrc.replace(/^ +$/gm, '');
while (src) {
// newline
let cap = this.rules.newline.exec(src);
if (cap) {
src = src.substring(cap[0].length);
if (cap[0].length > 1) {
this.tokens.push({
type: 'space'
});
}
}
// code
cap = this.rules.code.exec(src);
if (cap) {
src = src.substring(cap[0].length);
cap = cap[0].replace(/^ {4}/gm, '');
this.tokens.push({
type: 'code',
text: this.options.pedantic ? cap : cap.replace(/\n+$/, '')
});
continue;
}
// fences (gfm)
cap = this.rules.fences.exec(src);
if (cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: 'code',
lang: cap[2],
text: cap[3] || ''
});
continue;
}
// heading
cap = this.rules.heading.exec(src);
if (cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: 'heading',
depth: cap[1].length,
text: cap[2]
});
continue;
}
// table no leading pipe (gfm)
cap = this.rules.nptable.exec(src);
if (top && cap) {
src = src.substring(cap[0].length);
const item = {
type: 'table',
header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
cells: cap[3].replace(/\n$/, '').split('\n')
};
for (let i = 0; i < item.align.length; i++) {
if (/^ *-+: *$/.test(item.align[i])) {
item.align[i] = 'right';
} else if (/^ *:-+: *$/.test(item.align[i])) {
item.align[i] = 'center';
} else if (/^ *:-+ *$/.test(item.align[i])) {
item.align[i] = 'left';
} else {
item.align[i] = null;
}
}
for (let i = 0; i < item.cells.length; i++) {
item.cells[i] = item.cells[i].split(/ *\| */);
}
this.tokens.push(item);
continue;
}
// lheading
cap = this.rules.lheading.exec(src);
if (cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: 'heading',
depth: cap[2] === '=' ? 1 : 2,
text: cap[1]
});
continue;
}
// hr
cap = this.rules.hr.exec(src);
if (cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: 'hr'
});
continue;
}
// blockquote
cap = this.rules.blockquote.exec(src);
if (cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: 'blockquote_start'
});
cap = cap[0].replace(/^ *> ?/gm, '');
// Pass `top` to keep the current
// "toplevel" state. This is exactly
// how markdown.pl works.
this.token(cap, top, true);
this.tokens.push({
type: 'blockquote_end'
});
continue;
}
// list
cap = this.rules.list.exec(src);
if (cap) {
src = src.substring(cap[0].length);
const bull = cap[2];
this.tokens.push({
type: 'list_start',
ordered: bull.length > 1
});
// Get each top-level item.
cap = cap[0].match(this.rules.item);
let next = false;
const l = cap.length;
let i = 0;
for (; i < l; i++) {
let item = cap[i];
// Remove the list item's bullet
// so it is seen as the next token.
let space = item.length;
item = item.replace(/^ *([*+-]|\d+\.) +/, '');
// Outdent whatever the
// list item contains. Hacky.
if (~item.indexOf('\n ')) {
space -= item.length;
item = this.options.pedantic ?
item.replace(/^ {1,4}/gm, '') :
item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '');
}
// Determine whether the next list item belongs here.
// Backpedal if it does not belong in this list.
if (this.options.smartLists && i !== l - 1) {
const b = this.rules.bullet.exec(cap[i + 1])[0];
if (bull !== b && !(bull.length > 1 && b.length > 1)) {
src = cap.slice(i + 1).join('\n') + src;
i = l - 1;
}
}
// Determine whether item is loose or not.
// Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
// for discount behavior.
let loose = next || (/\n\n(?!\s*$)/).test(item);
if (i !== l - 1) {
next = item.charAt(item.length - 1) === '\n';
if (!loose) {
loose = next;
}
}
this.tokens.push({
type: loose ?
'loose_item_start' :
'list_item_start'
});
// Recurse.
this.token(item, false, bq);
this.tokens.push({
type: 'list_item_end'
});
}
this.tokens.push({
type: 'list_end'
});
continue;
}
// html
cap = this.rules.html.exec(src);
if (cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: this.options.sanitize ? 'paragraph' : 'html',
pre: !this.options.sanitizer && (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
text: cap[0]
});
continue;
}
// def
cap = this.rules.def.exec(src);
if ((!bq && top) && cap) {
src = src.substring(cap[0].length);
this.tokens.links[cap[1].toLowerCase()] = {
href: cap[2],
title: cap[3]
};
continue;
}
// table (gfm)
cap = this.rules.table.exec(src);
if (top && cap) {
src = src.substring(cap[0].length);
const item = {
type: 'table',
header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
cells: cap[3].replace(/(?: *\| *)?\n$/, '').split('\n')
};
for (let i = 0; i < item.align.length; i++) {
if (/^ *-+: *$/.test(item.align[i])) {
item.align[i] = 'right';
} else if (/^ *:-+: *$/.test(item.align[i])) {
item.align[i] = 'center';
} else if (/^ *:-+ *$/.test(item.align[i])) {
item.align[i] = 'left';
} else {
item.align[i] = null;
}
}
for (let i = 0; i < item.cells.length; i++) {
item.cells[i] = item.cells[i].replace(/^ *\| *| *\| *$/g, '').split(/ *\| */);
}
this.tokens.push(item);
continue;
}
// top-level paragraph
cap = this.rules.paragraph.exec(src);
if (top && cap) {
src = src.substring(cap[0].length);
this.tokens.push({
type: 'paragraph',
text: cap[1].charAt(cap[1].length - 1) === '\n' ? cap[1].slice(0, -1) : cap[1]
});
continue;
}
// text
cap = this.rules.text.exec(src);
if (cap) {
// Top-level should never reach here.
src = src.substring(cap[0].length);
this.tokens.push({
type: 'text',
text: cap[0]
});
continue;
}
if (src) {
throw new Error('Infinite loop on byte: ' + src.charCodeAt(0));
}
}
return this.tokens;
}
}
export function format(text, options) {
const markdownOptions = {
renderer: new MattermostMarkdownRenderer(null, options),
sanitize: true,
gfm: true,
tables: true
};
const tokens = new MattermostLexer(markdownOptions).lex(text);
return new marked.Parser(markdownOptions).parse(tokens);
}
// 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 '';
});
}