text: <?php
  /**
   * @copyright Copyright (c) 2014 Carsten Brandt
   * @license https://github.com/cebe/markdown/blob/master/LICENSE
   * @link https://github.com/cebe/markdown#readme
   */
  
  namespace cebe\markdown\block;
  
  /**
   * Adds the fenced code blocks
   *
   * automatically included 4 space indented code blocks
   */
  trait FencedCodeTrait
  {
  	use CodeTrait;
  
  	/**
  	 * identify a line as the beginning of a fenced code block.
  	 */
  	protected function identifyFencedCode($line)
  	{
  		return ($l = $line[0]) === '`' && strncmp($line, '```', 3) === 0 ||
  				$l === '~' && strncmp($line, '~~~', 3) === 0;
  	}
  
  	/**
  	 * Consume lines for a fenced code block
  	 */
  	protected function consumeFencedCode($lines, $current)
  	{
  		// consume until ```
  		$line = rtrim($lines[$current]);
  		$fence = substr($line, 0, $pos = strrpos($line, $line[0]) + 1);
  		$language = substr($line, $pos);
  		$content = [];
  		for ($i = $current + 1, $count = count($lines); $i < $count; $i++) {
  			if (rtrim($line = $lines[$i]) !== $fence) {
  				$content[] = $line;
  			} else {
  				break;
  			}
  		}
  		$block = [
  			'code',
  			'content' => implode("\n", $content),
  		];
  		if (!empty($language)) {
  			$block['language'] = $language;
  		}
  		return [$block, $i];
  	}
  }
  