0b10011 · July 10, 2015 05:06 · Jul 10, 2015
diff --git a/Converter.php b/Converter.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace CommonMark;
+
+use CommonMark\Inline\Processor\YouTubeVideoProcessor;
+use CommonMark\Inline\Renderer\YouTubeVideoRenderer;
+
+use League\CommonMark\Converter;
+use League\CommonMark\Environment;
+use League\CommonMark\DocParser;
+use League\CommonMark\HtmlRenderer;
+
+class CommonMarkConverter extends Converter {
+	public function __construct(array $config = []){
+		$environment = new Environment($config);
+		$environment->addExtension(new Extension\CommonMarkExtension());
+		$environment->addInlineProcessor(new YouTubeVideoProcessor());
+		$environment->addInlineRenderer(
+			"CommonMark\Inline\Element\YouTubeVideo",
+			new YouTubeVideoRenderer()
+		);
+
+		parent::__construct(
+			new DocParser($environment),
+			new HtmlRenderer($environment)
+		);
+	}
+}
diff --git a/YouTubeVideo.php b/YouTubeVideo.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace CommonMark\Inline\Element;
+
+class YouTubeVideo extends \League\CommonMark\Inline\Element\Link {}
diff --git a/YouTubeVideoProcessor.php b/YouTubeVideoProcessor.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace CommonMark\Inline\Processor;
+
+use CommonMark\Inline\Element\YouTubeVideo;
+
+use League\CommonMark\Inline\Processor\InlineProcessorInterface;
+use League\CommonMark\Delimiter\Delimiter;
+use League\CommonMark\Delimiter\DelimiterStack;
+use League\CommonMark\Inline\Element\Link;
+use League\CommonMark\Util\ArrayCollection;
+
+class YouTubeVideoProcessor implements InlineProcessorInterface
+{
+	public function processInlines(ArrayCollection $inlines, DelimiterStack $delimiterStack, Delimiter $stackBottom = null) {
+		foreach ($inlines as $key => $inline) {
+			if (!($inline instanceof Link)) {
+				continue;
+			}
+
+			$matched = preg_match(
+				'%^https://(?:www\.youtube\.com/watch\?v=|youtu\.be/)([^&#]+)%',
+				$inline->getUrl(),
+				$matches
+			);
+			if (!$matched) {
+				continue;
+			}
+
+			$inlines->set($key, new YouTubeVideo(
+				"https://youtu.be/$matches[1]",
+				$inline->getChildren(),
+				isset($inline->data['title']) ? $inline->data['title'] : null
+			));
+		}
+	}
+}
diff --git a/YouTubeVideoRenderer.php b/YouTubeVideoRenderer.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace CommonMark\Inline\Renderer;
+
+use CommonMark\Inline\Element\YouTubeVideo;
+
+use League\CommonMark\HtmlElement;
+use League\CommonMark\HtmlRendererInterface;
+use League\CommonMark\Inline\Element\AbstractInline;
+use League\CommonMark\Inline\Renderer\LinkRenderer;
+
+class YouTubeVideoRenderer extends LinkRenderer {
+	public function render(
+		AbstractInline $inline,
+		HtmlRendererInterface $htmlRenderer
+	){
+		if (!($inline instanceof YouTubeVideo)) {
+				throw new \InvalidArgumentException('Incompatible inline type: ' . get_class($inline));
+		}
+
+		$matched = preg_match(
+			'%^https://(?:www\.youtube\.com/watch\?v=|youtu\.be/)([^&#]+)%',
+			$inline->getUrl(),
+			$matches
+		);
+		if(!$matched){
+			return parent::render($inline, $htmlRenderer);
+		}
+
+		if (count($inline->getParent()->getInlines()) > 1) {
+			return parent::render($inline, $htmlRenderer);
+		}
+
+		$iframe = new HtmlElement('iframe', [
+			'width' => 640,
+			'height' => 390,
+			'src' => "https://www.youtube.com/embed/$matches[1]",
+			'type' => "text/html",
+			'frameborder' => 0,
+		]);
+
+		$div = new HtmlElement('span', ['class' => 'youtube-video'], $iframe);
+
+		return $div;
+	}
+}
diff --git a/style.css b/style.css
@@ -0,0 +1,16 @@
+
+.youtube-video {
+	display:block;
+	position: relative;
+	padding-bottom: 56.25%; /* 16:9 */
+	padding-top: 25px;
+	height: 0;
+
+	> iframe {
+		position: absolute;
+		top: 0;
+		left: 0;
+		width: 100%;
+		height: 100%;
+	}
+}
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