Initial commit

.editorconfig

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+; This file is for unifying the coding style for different editors and IDEs.
+; More information at http://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[composer.json]
+indent_size = 4
+indent_style = space

.gitattributes

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+* text=auto
+
+/tests            export-ignore
+/.editorconfig    export-ignore
+/.gitattributes   export-ignore
+/.gitignore       export-ignore
+/CONTRIBUTING.md  export-ignore
+/phpunit.xml.dist export-ignore

.github/dependabot.yml

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+version: 2
+updates:
+    - package-ecosystem: "github-actions"
+      directory: "/"
+      schedule:
+          interval: weekly

.github/workflows/run-tests.yml

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+name: Tests
+on: [push, pull_request]
+
+jobs:
+    test:
+        name: PHP ${{ matrix.php }} on ${{ matrix.os }} (${{ matrix.dependency-version }})
+        runs-on: ${{ matrix.os }}
+        strategy:
+            matrix:
+                os: [ubuntu-latest, windows-latest, macos-latest]
+                php: [8.1, 8.2]
+                dependency-version: [highest, lowest]
+        steps:
+            - uses: actions/[email protected]
+
+            - name: Configure PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  extensions: dom
+                  coverage: none
+
+            - name: Install dependencies
+              uses: ramsey/composer-install@v2
+              with:
+                  dependency-versions: ${{ matrix.dependency-version }}
+                  composer-options: "--prefer-dist"
+
+            - name: Execute tests
+              run: vendor/bin/phpunit

.gitignore

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+/composer.phar
+/composer.lock
+/vendor

CONTRIBUTING.md

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+# How to contribute
+Thank you for considering to contribute to this repository! This file will walk you through all the steps to ensure both
+you and I have a good time submitting and reviewing your contribution. First off, some basic rules and reading material:
+
+- Submit your work in a new branch and make the PR to the master branch.
+- [Write a short & descriptive commit message](http://chris.beams.io/posts/git-commit/).
+- Rebase before committing the final change.
+- Stick to [PSR-2](http://www.php-fig.org/psr/psr-2/).
+- Add tests if necessary and ensure all the tests are green on the final commit.
+- Make sure the CI tools used by the repository are all in order. If one fails, you should make it pass.
+
+## Contributing
+Here are the steps to follow to contribute to this repository:
+
+- [Fork this repository on GitHub](#fork-this-repository).
+- [Clone your fork to your local machine](#clone-your-fork).
+- [Create a feature branch](#create-a-branch).
+- [Add an 'upstream' remote](#add-a-remote).
+- [Regularly pull & rebase from the upstream remote](#pull-and-rebase).
+- [Work on feature branch](#working-on-branch).
+- [Make tests pass](#make-tests-pass)
+- [Submit a pull request to the master branch](#submitting-pull-request).
+
+### Fork this repository
+Fork the repository right here on GitHub. To learn more about forking a repository, visit
+[GitHub's help article](https://help.github.com/articles/fork-a-repo/).
+
+### Clone your fork
+Clone your repository on your local machine to start work on your pull request.
+
+```bash
+$ git clone [email protected]:<USERNAME>/<REPOSITORY>.git
+# Or if you prefer HTTPS:
+$ git clone https://github.com/<USERNAME>/<REPOSITORY>.git
+
+$ cd <REPOSITORY>
+```
+
+### Create a branch
+Make your own feature branch in order not to clutter up master.
+
+```bash
+# Think of a good name for your branch:
+#   fix/typo-in-readme
+#   feature/some-feature
+#   bug/some-bug-you-are-fixing
+$ git checkout -b <BRANCH_NAME>
+```
+
+### Add a remote
+Add an 'upstream' remote to pull from and to stay up to date with the work being done in there.
+
+```bash
+# List all current remotes
+$ git remote -v
+origin  [email protected]/<USERNAME>/<REPOSITORY>.git (fetch)
+origin  [email protected]/<USERNAME>/<REPOSITORY>.git (push)
+
+# Add a new remote called 'upstream'
+$ git remote add upstream [email protected]:svenluijten/<REPOSITORY>.git
+# Or if you prefer HTTPS:
+$ git remote add upstream https://github.com/svenluijten/<REPOSITORY>.git
+
+# The new remote should now be in the list
+$ git remote -v
+origin  [email protected]/<USERNAME>/<REPOSITORY>.git (fetch)
+origin  [email protected]/<USERNAME>/<REPOSITORY>.git (push)
+upstream  [email protected]/svenluijten/<REPOSITORY>.git (fetch)
+upstream  [email protected]/svenluijten/<REPOSITORY>.git (push)
+```
+
+### Pull and rebase
+Pull from upstream to stay up to date with what others might be doing in this repository. Any merge conflicts that arise
+are your responsibility to resolve.
+
+```bash
+$ git pull --rebase upstream master
+```
+
+### Working on branch
+Do your magic and make your fix. I can't help you with this 😉. Once you're happy with the result and all tests pass,
+go ahead and push to your feature branch.
+
+```bash
+$ git push origin <BRANCH_NAME>
+```
+
+### Make tests pass
+You can run `composer check` to see if the tests & static analysis pass. Feel free to only run the static analyses at the
+very end, this could take a while on bigger projects. To only run the tests, run `composer test`.
+
+### Submitting pull request
+Now, let's head back over to this repository on GitHub and submit the pull request!

LICENSE.md

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+# The MIT License (MIT)
+
+Copyright (c) Sven Luijten
+
+> Permission is hereby granted, free of charge, to any person obtaining a copy
+> of this software and associated documentation files (the "Software"), to deal
+> in the Software without restriction, including without limitation the rights
+> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+> copies of the Software, and to permit persons to whom the Software is
+> furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in
+> all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+> THE SOFTWARE.

README.md

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+![:package](:hero)
+
+# :package
+
+[![Latest Version on Packagist][ico-version]][link-packagist]
+[![Total Downloads][ico-downloads]][link-downloads]
+[![Software License][ico-license]](LICENSE.md)
+[![Build Status][ico-build]][link-build]
+[![StyleCI][ico-styleci]][link-styleci]
+
+Short description of the package. What does it do and why should people download
+it? Brag a bit but don't exaggerate. Talk about what's to come and tease small
+pieces of functionality.
+
+> :namespace
+> :package
+> :styleci
+> :hero
+
+## Installation
+You'll have to follow a couple of simple steps to install this package.
+
+### Downloading
+Via [composer](http://getcomposer.org):
+
+```bash
+$ composer require sven/:package
+```
+
+Or add the package to your dependencies in `composer.json` and run
+`composer update` on the command line to download the package:
+
+```json
+{
+    "require": {
+        "sven/:package": "*"
+    }
+}
+```
+
+
+### Registering the service provider
+> Is this a Laravel package?
+
+Next, add the `ServiceProvider` to your `providers` array in `config/app.php`:
+
+```php
+'providers' => [
+    ...
+    Sven\:namespace\ServiceProvider::class,
+];
+```
+
+If you would like to load this package in certain environments only, take a look
+at [sven/env-providers](https://github.com/svenluijten/env-providers).
+
+## Usage
+Some examples of the code. How should people use it, what options does this package
+provide? Should people be wary of some functionality?
+
+```php
+Maybe some code?
+```
+
+## Contributing
+All contributions (pull requests, issues and feature requests) are
+welcome. Make sure to read through the [CONTRIBUTING.md](CONTRIBUTING.md) first,
+though. See the [contributors page](../../graphs/contributors) for all contributors.
+
+## License
+`sven/:package` is licensed under the MIT License (MIT). Please see the
+[license file](LICENSE.md) for more information.
+
+[ico-version]: https://img.shields.io/packagist/v/sven/:package.svg?style=flat-square
+[ico-license]: https://img.shields.io/badge/license-MIT-green.svg?style=flat-square
+[ico-downloads]: https://img.shields.io/packagist/dt/sven/:package.svg?style=flat-square
+[ico-build]: https://img.shields.io/github/workflow/status/svenluijten/:package/Tests?style=flat-square
+[ico-styleci]: https://styleci.io/repos/:styleci/shield
+
+[link-packagist]: https://packagist.org/packages/sven/:package
+[link-downloads]: https://packagist.org/packages/sven/:package
+[link-build]: https://github.com/svenluijten/:package/actions/workflows/run-tests.yml
+[link-styleci]: https://styleci.io/repos/:styleci

composer.json

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+{
+    "name": "sven/commonmark-dark-mode-images",
+    "description": "",
+    "keywords": [],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Sven Luijten",
+            "email": "[email protected]",
+            "homepage": "https://svenluijten.com"
+        }
+    ],
+    "require": {
+        "league/commonmark": "^2.0"
+    },
+    "require-dev": {
+        "ext-dom": "*",
+        "phpunit/phpunit": "^10.0",
+        "spatie/phpunit-snapshot-assertions": "^5.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Sven\\CommonMark\\DarkModeImages\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Sven\\CommonMark\\DarkModeImages\\Tests\\": "tests/"
+        }
+    },
+    "config": {
+        "sort-packages": true
+    }
+}

phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.2/phpunit.xsd"
+         backupGlobals="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         cacheDirectory=".phpunit.cache"
+         backupStaticProperties="false"
+>
+    <testsuites>
+        <testsuite name="CommonMark Dark Mode Images Test Suite">
+            <directory suffix="Test.php">./tests/</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>

src/DarkModeImagesExtension.php

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+<?php
+
+namespace Sven\CommonMark\DarkModeImages;
+
+use League\CommonMark\Environment\EnvironmentBuilderInterface;
+use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Extension\Attributes\AttributesExtension;
+use League\CommonMark\Extension\ConfigurableExtensionInterface;
+use League\Config\ConfigurationBuilderInterface;
+use Nette\Schema\Expect;
+use Sven\CommonMark\DarkModeImages\Event\DarkModeImagesListener;
+use Sven\CommonMark\DarkModeImages\Node\Picture;
+use Sven\CommonMark\DarkModeImages\Node\Source;
+use Sven\CommonMark\DarkModeImages\Renderer\PictureRenderer;
+use Sven\CommonMark\DarkModeImages\Renderer\SourceRenderer;
+
+final class DarkModeImagesExtension implements ConfigurableExtensionInterface
+{
+    public function register(EnvironmentBuilderInterface $environment): void
+    {
+        $extensions = $environment->getExtensions();
+
+        $this->assertArrayContainsInstanceOf(AttributesExtension::class, $extensions);
+
+        $environment
+            ->addEventListener(DocumentParsedEvent::class, [new DarkModeImagesListener(), 'processDocument'])
+            ->addRenderer(Picture::class, new PictureRenderer())
+            ->addRenderer(Source::class, new SourceRenderer())
+        ;
+    }
+
+    public function configureSchema(ConfigurationBuilderInterface $builder): void
+    {
+        $builder->addSchema('dark_mode_images', Expect::structure([
+            'dark_image_class' => Expect::string()->default('dark-image'),
+            'light_image_class' => Expect::string()->default('light-image'),
+            'picture_class' => Expect::string()->default('dark-mode-images-picture'),
+            'fallback' => Expect::anyOf('light', 'dark')->default('light'),
+        ]));
+    }
+
+    private function assertArrayContainsInstanceOf(string $class, iterable $extensions): void
+    {
+        foreach ($extensions as $extension) {
+            if ($extension instanceof $class) {
+                return;
+            }
+        }
+
+        throw new \RuntimeException('The "'.self::class.'" extension requires the "'.$class.'" extension to loaded before it.');
+    }
+}