postCache)) { return $this->postCache; } $markdownSource = file_get_contents($this->filePath); // Evaluate all PHP code blocks which have the magic eval comment $markdownSource = preg_replace_callback( "#```php\n//\[eval\](?
.+?)```#s",
            function (array $matches): string {
                ob_start();
                eval($matches['code']);

                return ob_get_clean();
            },
            $markdownSource,
        );

        // Replace magic include statements
        $markdownSource = preg_replace_callback(
            "#\+\((?.+?)\)#s",
            function (array $matches): string {
                $path = __DIR__ . '/../' . $matches['includePath'];

                if (file_exists($path) === false) {
                    throw new \Exception('Unable to include file [' . $path . ']');
                }

                return file_get_contents($path);
            },
            $markdownSource,
        );

        // Evaluate all HTML code blocks which have the magic eval comment
        $markdownSource = preg_replace_callback(
            "#```html\n(?.+?)```#s",
            function (array $matches): string {
                $key = 'FRAME' . base64_encode(random_bytes(8));

                $this->frameInjections[$key] = '';

                return $key;
            },
            $markdownSource,
        );

        $highlighter = new Highlighter()
            ->addLanguage(new OpenscadLanguage())
            ->addLanguage(new BashLanguage())
        ;

        $environment = new Environment()
            ->addExtension(new CommonMarkCoreExtension())
            ->addExtension(new SmartImageExtension())
            ->addExtension(new MarkdownTagExtension())
            ->addExtension(new HighlightExtension($highlighter))
            ->addExtension(new TableExtension())
            ->addExtension(new StlModelViewerExtension())
            ->addExtension(new StrikethroughExtension())
            ->addExtension(new AttributesExtension())
        ;

        return $this->postCache = new MarkdownConverter($environment)
            ->convert($markdownSource);
    }

    public function getPublishedAt(): DateTimeImmutable
    {
        $date = explode('_', pathinfo($this->filePath, PATHINFO_FILENAME))[0];

        return new DateTimeImmutable($date);
    }

    /** @return string[] */
    public function getTags(): iterable
    {
        $nodes = new Query()
            ->where(Query::type(Tag::class))
            ->findAll($this->parseMarkdown()->getDocument());

        $tags = array_map(
            fn(Tag $tag): string => $tag->getLiteral(),
            iterator_to_array($nodes),
        );

        asort($tags);

        return $tags;
    }

    public function getTitle(): string
    {
        return new Query()
            ->where(Query::type(Heading::class))
            ->findOne($this->parseMarkdown()->getDocument())
            ?->firstChild()
            ->getLiteral() ?? throw new \Exception('No title found');
    }

    public function getBody(): string
    {
        $content = $this->parseMarkdown()->getContent();

        foreach ($this->frameInjections as $key => $iframeHtml) {
            $content = str_replace('' . $key . '', $iframeHtml, $content);
        }

        return preg_replace('/[^<]+<\/h1>/', '', $content);
    }

    public function __toString(): string
    {
        return $this->getBody();
    }

    public function getUrl(): string
    {
        return '/' . explode('_', pathinfo($this->filePath, PATHINFO_FILENAME))[1];
    }

    public function getId(): string
    {
        return pathinfo($this->filePath, PATHINFO_FILENAME);
    }

    public function getWordCount(): int
    {
        return str_word_count($this->getBody());
    }
}