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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Extension\FrontMatter; |
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use League\CommonMark\Extension\FrontMatter\Data\FrontMatterDataParserInterface; |
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use League\CommonMark\Extension\FrontMatter\Input\MarkdownInputWithFrontMatter; |
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use League\CommonMark\Parser\Cursor; |
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final class FrontMatterParser implements FrontMatterParserInterface |
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{ |
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/** @psalm-readonly */ |
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private FrontMatterDataParserInterface $frontMatterParser; |
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private const REGEX_FRONT_MATTER = '/^---\\R.*?\\R---\\R/s'; |
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public function __construct(FrontMatterDataParserInterface $frontMatterParser) |
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{ |
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$this->frontMatterParser = $frontMatterParser; |
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} |
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public function parse(string $markdownContent): MarkdownInputWithFrontMatter |
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{ |
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$cursor = new Cursor($markdownContent); |
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// Locate the front matter |
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$frontMatter = $cursor->match(self::REGEX_FRONT_MATTER); |
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if ($frontMatter === null) { |
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return new MarkdownInputWithFrontMatter($markdownContent); |
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} |
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// Trim the last line (ending ---s and newline) |
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$frontMatter = \preg_replace('/---\R$/', '', $frontMatter); |
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if ($frontMatter === null) { |
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return new MarkdownInputWithFrontMatter($markdownContent); |
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} |
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// Parse the resulting YAML data |
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$data = $this->frontMatterParser->parse($frontMatter); |
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// Advance through any remaining newlines which separated the front matter from the Markdown text |
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$trailingNewlines = $cursor->match('/^\R+/'); |
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// Calculate how many lines the Markdown is offset from the front matter by counting the number of newlines |
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// Don't forget to add 1 because we stripped one out when trimming the trailing delims |
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$lineOffset = \preg_match_all('/\R/', $frontMatter . $trailingNewlines) + 1; |
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return new MarkdownInputWithFrontMatter($cursor->getRemainder(), $lineOffset, $data); |
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} |
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} |
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thephpleague /
commonmark
