Markdown parser done right. Fast and easy to extend.
Live demo
Install
node.js:
npm install remarkable --save
browser (CDN):
Usage
import { Remarkable } from 'remarkable';
var md = new Remarkable();
console.log(md.render('# Remarkable rulezz!'));
or with commonjs
const { Remarkable } = require('remarkable');
var md = new Remarkable();
console.log(md.render('# Remarkable rulezz!'));
If installed globally with npm
:
cat myfile.md | remarkable
remarkable --file myfile.md
remarkable -h
Documentation
See the docs directory for documentation on the following topics:
Options
By default, remarkable is configured to be similar to GFM, but with HTML disabled.
This is easy to change if you prefer different settings.
There are two ways to define options.
constructor
Define options in the constructor:
var md = new Remarkable({
html: false,
xhtmlOut: false,
breaks: false,
langPrefix: 'language-',
typographer: false,
quotes: '“”‘’',
highlight: function () { return ''; }
});
console.log(md.render('# Remarkable rulezz!'));
.set
Or define options via the .set()
method:
import { Remarkable } from 'remarkable';
var md = new Remarkable();
md.set({
html: true,
breaks: true
});
Note: To achieve the best possible performance, don't modify a Remarkable
instance on the fly. If you need multiple configurations, create
multiple instances and initialize each with a configuration that is ideal for
that instance.
Presets
Remarkable offers some "presets" as a convenience to quickly enable/disable
active syntax rules and options for common use cases.
commonmark
Enable strict CommonMark mode with the commonmark
preset:
import { Remarkable } from 'remarkable';
var md = new Remarkable('commonmark');
full
Enable all available rules (but still with default options, if not set):
import { Remarkable } from 'remarkable';
var md = new Remarkable('full');
var md = new Remarkable('full', {
html: true,
typographer: true
});
Syntax highlighting
Apply syntax highlighting to fenced code blocks with the highlight
option:
import { Remarkable } from 'remarkable';
import hljs from 'highlight.js'
var md = new Remarkable({
highlight: function (str, lang) {
if (lang && hljs.getLanguage(lang)) {
try {
return hljs.highlight(lang, str).value;
} catch (err) {}
}
try {
return hljs.highlightAuto(str).value;
} catch (err) {}
return '';
}
});
Syntax extensions
Enabled by default:
Disabled by default:
- <sup> -
19^th^
- <sub> -
H~2~O
- abbreviations
- <ins> -
++inserted text++
(experimental) - <mark> -
==marked text==
(experimental)
HEADS UP!: Experimental extensions can be changed later for something like Critic Markup, but you will still be able to use old-style rules via external plugins if you prefer.
Manage rules
var md = new Remarkable();
md.inline.ruler.enable([ 'ins', 'mark' ]);
md.block.ruler.disable([ 'table', 'footnote' ]);
md = new Remarkable('full', {
html: true,
typographer: true,
});
var md = new Remarkable();
md.core.ruler.enable([
'abbr'
]);
md.block.ruler.enable([
'footnote',
'deflist'
]);
md.inline.ruler.enable([
'footnote_inline',
'ins',
'mark',
'sub',
'sup'
]);
Typographer
Although full-weight typographical replacements are language specific, remarkable
provides coverage for the most common and universal use cases:
import { Remarkable } from 'remarkable';
var md = new Remarkable({
typographer: true,
quotes: '“”‘’'
});
md.core.ruler.disable([ 'replacements', 'smartquotes' ]);
Of course, you can also add your own rules or replace the defaults with something
more advanced or specific to your language.
Plugins
Easily load plugins with the .use()
method:
var md = new Remarkable();
md.use(plugin1)
.use(plugin2, opts)
.use(plugin3);
Please refer to the plugin documentation to create your own
plugins.
linkify plugin
Autoconvert URL-like text to links
import { Remarkable } from 'remarkable';
import { linkify } from 'remarkable/linkify';
var md = new Remarkable().use(linkify);
UMD
UMD bundle provides linkify out of the box
const { Remarkable, linkify, utils } = window.remarkable;
References / Thanks
Big thanks to John MacFarlane for his work on the
CommonMark spec and reference implementations. His work saved us a lot of time
during this project's development.
Related Links:
- https://github.com/jgm/CommonMark - reference CommonMark implementations in C & JS,
also contains latest spec & online demo.
- http://talk.commonmark.org - CommonMark forum, good place to collaborate
developers' efforts.
Development / Modification
Parser consists of several responsibility chains filled with
rules. You can reconfigure any of them as you wish. Renderer also
can be modified and extended. See source code to understand details. Pay
attention to these properties:
Remarkable.core
Remarkable.core.ruler
Remarkable.block
Remarkable.block.ruler
Remarkable.inline
Remarkable.inline.ruler
Remarkable.renderer
Remarkable.renderer.rules
Benchmark
Here is result of CommonMark spec parse at Core i5 2.4 GHz (i5-4258U):
$ benchmark/benchmark.js spec
Selected samples: (1 of 27)
> spec
Sample: spec.txt (110610 bytes)
> commonmark-reference x 40.42 ops/sec ±4.07% (51 runs sampled)
> current x 74.99 ops/sec ±4.69% (67 runs sampled)
> current-commonmark x 93.76 ops/sec ±1.23% (79 runs sampled)
> marked-0.3.2 x 22.92 ops/sec ±0.79% (41 runs sampled)
As you can see, remarkable
doesn't pay with speed for its flexibility. Because
it's written in monomorphic style and uses JIT inline caches effectively.
Authors
License
MIT