README

A block renderer for league/commonmark to highlight code blocks using scrivo/highlight.php.

highlight.php is a server side code highlighter written in PHP that currently supports 185 languages. It's a port of highlight.js by Ivan Sagalaev that makes full use of the language and style definitions of the original JavaScript project.

The output html is compatible with highlight.js themes, which you can explore on highlightjs.org.

What are the benefits of using this package over highlight.js?

• Less JavaScript, which means faster page loads
• No more flash of unstyled code blocks

This project was inspired by sixlive/parsedown-highlight.

Installation

You can install the package via composer:

composer require spatie/commonmark-highlighter

Usage

Create a custom CommonMark environment, and register the FencedCodeRenderer and IndentedCodeRender as described in the league/commonmark documentation.

use League\CommonMark\Block\Element\FencedCode;
use League\CommonMark\Block\Element\IndentedCode;
use League\CommonMark\CommonMarkConverter;
use League\CommonMark\Environment;
use Spatie\CommonMarkHighlighter\FencedCodeRenderer;
use Spatie\CommonMarkHighlighter\IndentedCodeRenderer;

$environment = Environment::createCommonMarkEnvironment();
$environment->addBlockRenderer(FencedCode::class, new FencedCodeRenderer());
$environment->addBlockRenderer(IndentedCode::class, new IndentedCodeRenderer());

$commonMarkConverter = new CommonMarkConverter([], $environment);

echo $commonMarkConverter->convertToHtml($markdown);

The underlying highlight library recommends specifying a subset of languages for the auto-detection. You can pass an array of languages to any of the renderers.

new FencedCodeRenderer(['html', 'php', 'js']);

new IndentedCodeCodeRenderer(['html', 'php', 'js']);

Highlighting specific lines

Line numbers start at 1.

```php - Don't highlight any lines
```php{4} - Highlight just line 4
```php{4-6} - Highlight the range of lines from 4 to 6 (inclusive)
```php{1,5} - Highlight just lines 1 and 5 on their own
```php{1-3,5} - Highlight 1 through 3 and then 5 on its own
```php{5,7,2-3} - The order of lines don't matter
However, specifying 3-2 will not work.

Testing

composer test

Changelog

Please see CHANGELOG for more information on what has changed recently.

Contributing

Please see CONTRIBUTING for details.

Security

If you discover any security related issues, please email freek@spatie.be instead of using the issue tracker.

Postcardware

You're free to use this package, but if it makes it to your production environment we highly appreciate you sending us a postcard from your hometown, mentioning which of our package(s) you are using.

Our address is: Spatie, Samberstraat 69D, 2060 Antwerp, Belgium.

We publish all received postcards on our company website.

Credits

• Sebastian De Deyne
• All Contributors

Support us

Spatie is a webdesign agency based in Antwerp, Belgium. You'll find an overview of all our open source projects on our website.

Does your business depend on our contributions? Reach out and support us on Patreon. All pledges will be dedicated to allocating workforce on maintenance and new awesome stuff.

License

The MIT License (MIT). Please see License File for more information.