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<?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;

/**
 * Markdown parser for github flavored markdown.
 *
 * @author Carsten Brandt <mail@cebe.cc>
 */
class GithubMarkdown extends Markdown
{
	// include block element parsing using traits
	use block\TableTrait;
	use block\FencedCodeTrait;

// include inline element parsing using traits
	use inline\StrikeoutTrait;
	use inline\UrlLinkTrait;

/**
	 * @var boolean whether to interpret newlines as `<br />`-tags.
	 * This feature is useful for comments where newlines are often meant to be real new lines.
	 */
	public $enableNewlines = false;

/**
	 * @inheritDoc
	 */
	protected $escapeCharacters = [
		// from Markdown
		'\\', // backslash
		'`', // backtick
		'*', // asterisk
		'_', // underscore
		'{', '}', // curly braces
		'[', ']', // square brackets
		'(', ')', // parentheses
		'#', // hash mark
		'+', // plus sign
		'-', // minus sign (hyphen)
		'.', // dot
		'!', // exclamation mark
		'<', '>',
		// added by GithubMarkdown
		':', // colon
		'|', // pipe
	];

/**
	 * Consume lines for a paragraph
	 *
	 * Allow headlines, lists and code to break paragraphs
	 */
	protected function consumeParagraph($lines, $current)
	{
		// consume until newline
		$content = [];
		for ($i = $current, $count = count($lines); $i < $count; $i++) {
			$line = $lines[$i];
			if ($line === ''
				|| ltrim($line) === ''
				|| !ctype_alpha($line[0]) && (
					$this->identifyQuote($line, $lines, $i) ||
					$this->identifyFencedCode($line, $lines, $i) ||
					$this->identifyUl($line, $lines, $i) ||
					$this->identifyOl($line, $lines, $i) ||
					$this->identifyHr($line, $lines, $i)
				)
				|| $this->identifyHeadline($line, $lines, $i))
			{
				break;
			} elseif ($this->identifyCode($line, $lines, $i)) {
				// possible beginning of a code block
				// but check for continued inline HTML
				// e.g. <img src="file.jpg"
				//           alt="some alt aligned with src attribute" title="some text" />
				if (preg_match('~<\w+([^>]+)$~s', implode("\n", $content))) {
					$content[] = $line;
				} else {
					break;
				}
			} else {
				$content[] = $line;
			}
		}
		$block = [
			'paragraph',
			'content' => $this->parseInline(implode("\n", $content)),
		];
		return [$block, --$i];
	}

/**
	 * @inheritdocs
	 *
	 * Parses a newline indicated by two spaces on the end of a markdown line.
	 */
	protected function renderText($text)
	{
		if ($this->enableNewlines) {
			$br = $this->html5 ? "<br>\n" : "<br />\n";
			return strtr($text[1], ["  \n" => $br, "\n" => $br]);
		} else {
			return parent::renderText($text);
		}
	}
}