README.md
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# league/commonmark [](https://packagist.org/packages/league/commonmark) [](https://packagist.org/packages/league/commonmark) [](LICENSE) [](https://travis-ci.org/thephpleague/commonmark) [](https://scrutinizer-ci.com/g/thephpleague/commonmark/code-structure) [](https://scrutinizer-ci.com/g/thephpleague/commonmark) [](https://bestpractices.coreinfrastructure.org/projects/126) [](https://www.colinodell.com/sponsor)  **league/commonmark** is a highly-extensible PHP Markdown parser created by [Colin O'Dell][@colinodell] which supports the full [CommonMark] spec and [Github-Flavored Markdown]. It is based on the [CommonMark JS reference implementation][commonmark.js] by [John MacFarlane] \([@jgm]\). ## 📦 Installation & Basic Usage This project requires PHP 7.1 or higher with the `mbstring` extension. To install it via [Composer] simply run: ``` bash $ composer require league/commonmark ``` The `CommonMarkConverter` class provides a simple wrapper for converting CommonMark to HTML: ```php use League\CommonMark\CommonMarkConverter; $converter = new CommonMarkConverter([ 'html_input' => 'strip', 'allow_unsafe_links' => false, ]); echo $converter->convertToHtml('# Hello World!'); // <h1>Hello World!</h1> ``` Or if you want Github-Flavored Markdown, use the `GithubFlavoredMarkdownConverter` class instead: ```php use League\CommonMark\GithubFlavoredMarkdownConverter; $converter = new GithubFlavoredMarkdownConverter([ 'html_input' => 'strip', 'allow_unsafe_links' => false, ]); echo $converter->convertToHtml('# Hello World!'); // <h1>Hello World!</h1> ``` Please note that only UTF-8 and ASCII encodings are supported. If your Markdown uses a different encoding please convert it to UTF-8 before running it through this library. 🔒 If you will be parsing untrusted input from users, please consider setting the `html_input` and `allow_unsafe_links` options per the example above. See <https://commonmark.thephpleague.com/security/> for more details. If you also do choose to allow raw HTML input from untrusted users, considering using a library (like [HTML Purifier](https://github.com/ezyang/htmlpurifier)) to provide additional HTML filtering. ## 📓 Documentation Full documentation on advanced usage, configuration, and customization can be found at [commonmark.thephpleague.com][docs]. ## ⏫ Upgrading Information on how to upgrade to newer versions of this library can be found at <https://commonmark.thephpleague.com/releases>. ## 💻 Github-Flavored Markdown The `GithubFlavoredMarkdownConverter` shown earlier is a drop-in replacement for the `CommonMarkConverter` which adds additional features found in the GFM spec: - Autolinks - Disallowed raw HTML - Strikethrough - Tables - Task Lists See the [Extensions documentation](https://commonmark.thephpleague.com/customization/extensions/) for more details on how to include only certain GFM features if you don't want them all. ## 🗃️ Related Packages ### Integrations - [CakePHP 3](https://github.com/gourmet/common-mark) - [Drupal](https://www.drupal.org/project/markdown) - [Laravel 4 & 5](https://github.com/GrahamCampbell/Laravel-Markdown) - [Sculpin](https://github.com/bcremer/sculpin-commonmark-bundle) - [Symfony 2 & 3](https://github.com/webuni/commonmark-bundle) - [Symfony 4](https://github.com/avensome/commonmark-bundle) - [Twig Markdown extension](https://github.com/twigphp/markdown-extension) - [Twig filter and tag](https://github.com/aptoma/twig-markdown) ### Included Extensions See [our extension documentation](https://commonmark.thephpleague.com/extensions/overview) for a full list of extensions bundled with this library. ### Community Extensions Custom parsers/renderers can be bundled into extensions which extend CommonMark. Here are some that you may find interesting: - [Alt Three Emoji](https://github.com/AltThree/Emoji) An emoji parser for CommonMark. - [Sup Sub extensions](https://github.com/OWS/commonmark-sup-sub-extensions) - Adds support of superscript and subscript (`<sup>` and `<sub>` HTML tags) - [YouTube iframe extension](https://github.com/zoonru/commonmark-ext-youtube-iframe) - Replaces youtube link with iframe. Others can be found on [Packagist under the `commonmark-extension` package type](https://packagist.org/packages/league/commonmark?type=commonmark-extension). If you build your own, feel free to submit a PR to add it to this list! ### Others Check out the other cool things people are doing with `league/commonmark`: <https://packagist.org/packages/league/commonmark/dependents> ## 🏷️ Versioning [SemVer](http://semver.org/) is followed closely. Minor and patch releases should not introduce breaking changes to the codebase; however, they might change the resulting AST or HTML output of parsed Markdown (due to bug fixes, spec changes, etc.) As a result, you might get slightly different HTML, but any custom code built onto this library should still function correctly. Any classes or methods marked `@internal` are not intended for use outside of this library and are subject to breaking changes at any time, so please avoid using them. ## 🛠️ Maintenance & Support When a new **minor** version (e.g. `1.4` -> `1.5`) is released, the previous one (`1.4`) will continue to receive security and critical bug fixes for *at least* 3 months. When a new **major** version is released (e.g. `1.5` -> `2.0`), the previous one (`1.5`) will receive critical bug fixes for *at least* 3 months and security updates for 6 months after that new release comes out. (This policy may change in the future and exceptions may be made on a case-by-case basis.) **Professional support, including notification of new releases and security updates, is available through a [Tidelift Subscription](https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme).** ## 👷♀️ Contributing To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure with us. If you encounter a bug in the spec, please report it to the [CommonMark] project. Any resulting fix will eventually be implemented in this project as well. Contributions to this library are **welcome**, especially ones that: * Improve usability or flexibility without compromising our ability to adhere to the [CommonMark spec] * Mirror fixes made to the [reference implementation][commonmark.js] * Optimize performance * Fix issues with adhering to the [CommonMark spec] Major refactoring to core parsing logic should be avoided if possible so that we can easily follow updates made to [the reference implementation][commonmark.js]. That being said, we will absolutely consider changes which don't deviate too far from the reference spec or which are favored by other popular CommonMark implementations. Please see [CONTRIBUTING](https://github.com/thephpleague/commonmark/blob/latest/.github/CONTRIBUTING.md) for additional details. ## 🧪 Testing ``` bash $ composer test ``` This will also test league/commonmark against the latest supported spec. ## 🚀 Performance Benchmarks You can compare the performance of **league/commonmark** to other popular parsers by running the included benchmark tool: ``` bash $ ./tests/benchmark/benchmark.php ``` ## 👥 Credits & Acknowledgements - [Colin O'Dell][@colinodell] - [John MacFarlane][@jgm] - [All Contributors] This code is partially based on the [CommonMark JS reference implementation][commonmark.js] which is written, maintained and copyrighted by [John MacFarlane]. This project simply wouldn't exist without his work. ### Sponsors We'd also like to extend our sincere thanks the following sponsors who support ongoing development of this project: - [Tidelift](https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme) for offering support to both the maintainers and end-users through their [professional support](https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme) program - [RIPS Technologies](https://www.ripstech.com/) for supporting this project with a complimentary [RIPS SaaS](https://www.ripstech.com/product/) license - [JetBrains](https://www.jetbrains.com/) for supporting this project with complimentary [PhpStorm](https://www.jetbrains.com/phpstorm/) licenses Are you interested in sponsoring development of this project? See <https://www.colinodell.com/sponsor> for a list of ways to contribute. ## 📄 License **league/commonmark** is licensed under the BSD-3 license. See the [`LICENSE`](LICENSE) file for more details. ## 🏛️ Governance This project is primarily maintained by [Colin O'Dell][@colinodell]. Members of the [PHP League] Leadership Team may occasionally assist with some of these duties. ## 🗺️ Who Uses It? This project is used by [Drupal](https://www.drupal.org/project/markdown), [Laravel Framework](https://laravel.com/), [Cachet](https://cachethq.io/), [Firefly III](https://firefly-iii.org/), [Neos](https://www.neos.io/), [Daux.io](https://daux.io/), and [more](https://packagist.org/packages/league/commonmark/dependents)! --- <div align="center"> <b> <a href="https://tidelift.com/subscription/pkg/packagist-league-commonmark?utm_source=packagist-league-commonmark&utm_medium=referral&utm_campaign=readme">Get professional support for league/commonmark with a Tidelift subscription</a> </b> <br> <sub> Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies. </sub> </div> [CommonMark]: http://commonmark.org/ [CommonMark spec]: http://spec.commonmark.org/ [commonmark.js]: https://github.com/jgm/commonmark.js [Github-Flavored Markdown]: https://github.github.com/gfm/ [John MacFarlane]: http://johnmacfarlane.net [docs]: https://commonmark.thephpleague.com/ [docs-examples]: https://commonmark.thephpleague.com/customization/overview/#examples [docs-example-twitter]: https://commonmark.thephpleague.com/customization/inline-parsing#example-1---twitter-handles [docs-example-smilies]: https://commonmark.thephpleague.com/customization/inline-parsing#example-2---emoticons [All Contributors]: https://github.com/thephpleague/commonmark/contributors [@colinodell]: https://www.twitter.com/colinodell [@jgm]: https://github.com/jgm [jgm/stmd]: https://github.com/jgm/stmd [Composer]: https://getcomposer.org/ [PHP League]: https://thephpleague.com
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