91 lines
2.8 KiB
PHP
91 lines
2.8 KiB
PHP
<?php
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namespace App\Services;
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use App\Models\Document;
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class DocumentPreviewService
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{
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/**
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* 将文档的 Markdown 内容转换为 HTML 用于预览
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* 统一用于 Filament 后台内联预览和独立预览页面
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*
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* @throws \Exception
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*/
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public function convertToHtml(Document $document): string
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{
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return $this->convertMarkdownToHtml($document);
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}
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/**
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* 将 Markdown 转换为 HTML
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*
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* @throws \Exception
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*/
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public function convertMarkdownToHtml(Document $document): string
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{
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$markdownContent = $document->getMarkdownContent();
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if (empty($markdownContent)) {
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throw new \Exception('Markdown 内容为空');
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}
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app(DocumentConversionService::class)->ensureMarkdownMediaAssets($document);
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$markdownContent = $this->stripPreviewFrontMatter($markdownContent);
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$markdownContent = $this->rewriteMarkdownMediaPaths($document, $markdownContent);
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$renderService = app(MarkdownRenderService::class);
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return $renderService->render($markdownContent);
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}
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protected function stripPreviewFrontMatter(string $markdownContent): string
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{
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if (!preg_match('/\A---\R(?P<frontmatter>.*?\R)---\R*/s', $markdownContent, $matches)) {
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return $markdownContent;
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}
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$frontMatter = $matches['frontmatter'] ?? '';
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if (!preg_match('/^(author|source_file):/m', $frontMatter)) {
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return $markdownContent;
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}
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return (string) preg_replace('/\A---\R.*?\R---\R*/s', '', $markdownContent, 1);
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}
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protected function rewriteMarkdownMediaPaths(Document $document, string $markdownContent): string
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{
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$documentDir = dirname($document->markdown_path);
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return (string) preg_replace_callback(
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'/!\[(?<alt>[^\]]*)]\((?<path>(?:\.\/)?media\/[^)]+)\)/',
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function (array $matches) use ($documentDir): string {
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$relativePath = trim($matches['path'] ?? '');
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$relativePath = preg_replace('/^\.?\//', '', $relativePath) ?? $relativePath;
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$relativePath = ltrim(str_replace('\\', '/', $relativePath), '/');
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$segments = array_filter(
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explode('/', $documentDir . '/' . $relativePath),
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fn (string $segment): bool => $segment !== ''
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);
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$url = '/markdown-media/' . implode('/', array_map('rawurlencode', $segments));
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return sprintf('', $matches['alt'] ?? '', $url);
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},
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$markdownContent
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);
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}
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/**
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* 检查文档是否可以预览
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*/
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public function canPreview(Document $document): bool
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{
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return $document->conversion_status === 'completed'
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&& !empty($document->markdown_path);
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}
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}
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