' . inline_markdown(trim($paragraph)) . "\n";
$paragraph = '';
}
};
$close_list = function () use (&$html, &$in_list, &$in_ol) {
if ($in_list) { $html .= "\n"; $in_list = false; }
if ($in_ol) { $html .= "\n"; $in_ol = false; }
};
foreach ($lines as $line) {
// Fenced code blocks
if (preg_match('/^```(\w*)/', $line, $m)) {
$flush_paragraph();
$close_list();
if (!$in_code) {
$lang = $m[1] ? ' class="language-' . e($m[1]) . '"' : '';
$html .= "";
$in_code = true;
} else {
$html .= "
\n";
$in_code = false;
}
continue;
}
if ($in_code) {
$html .= e($line) . "\n";
continue;
}
// Blank line
if (trim($line) === '') {
$flush_paragraph();
$close_list();
if ($in_blockquote) { $html .= "\n"; $in_blockquote = false; }
continue;
}
// Headings
if (preg_match('/^(#{1,6})\s+(.+)/', $line, $m)) {
$flush_paragraph(); $close_list();
$level = strlen($m[1]);
$id = slugify($m[2]);
$html .= "" . inline_markdown($m[2]) . "\n";
continue;
}
// Horizontal rule
if (preg_match('/^(-{3,}|\*{3,}|_{3,})$/', trim($line))) {
$flush_paragraph(); $close_list();
$html .= "
\n";
continue;
}
// Blockquote
if (preg_match('/^>\s?(.*)/', $line, $m)) {
$flush_paragraph(); $close_list();
if (!$in_blockquote) { $html .= "\n"; $in_blockquote = true; }
$html .= '' . inline_markdown($m[1]) . "
\n";
continue;
}
// Unordered list
if (preg_match('/^[\-\*]\s+(.+)/', $line, $m)) {
$flush_paragraph();
if ($in_ol) { $html .= "\n"; $in_ol = false; }
if (!$in_list) { $html .= "\n"; $in_list = true; }
$html .= '- ' . inline_markdown($m[1]) . "
\n";
continue;
}
// Ordered list
if (preg_match('/^\d+\.\s+(.+)/', $line, $m)) {
$flush_paragraph();
if ($in_list) { $html .= "
\n"; $in_list = false; }
if (!$in_ol) { $html .= "\n"; $in_ol = true; }
$html .= '- ' . inline_markdown($m[1]) . "
\n";
continue;
}
// Paragraph text
$paragraph .= $line . "\n";
}
$flush_paragraph();
$close_list();
if ($in_code) $html .= "\n";
if ($in_blockquote) $html .= "
\n";
return $html;
}
/**
* Process inline markdown: bold, italic, code, links, images.
*/
function inline_markdown(string $text): string {
// Images: 
$text = preg_replace('/!\[([^\]]*)\]\(([^)]+)\)/', '
', $text);
// Links: [text](url)
$text = preg_replace('/\[([^\]]+)\]\(([^)]+)\)/', '$1', $text);
// Bold+italic
$text = preg_replace('/\*\*\*(.+?)\*\*\*/', '$1', $text);
// Bold
$text = preg_replace('/\*\*(.+?)\*\*/', '$1', $text);
// Italic
$text = preg_replace('/\*(.+?)\*/', '$1', $text);
// Inline code
$text = preg_replace('/`([^`]+)`/', '$1', $text);
return $text;
}
/**
* HTML-escape shorthand.
*/
function e(string $s): string {
return htmlspecialchars($s, ENT_QUOTES | ENT_HTML5, 'UTF-8');
}
/**
* Generate a URL-friendly slug from text.
*/
function slugify(string $text): string {
$text = strtolower(strip_tags($text));
$text = preg_replace('/[^a-z0-9\s-]/', '', $text);
return preg_replace('/[\s-]+/', '-', trim($text));
}
/**
* Load and render a markdown content file. Returns HTML or null.
*/
function load_content(string $slug): ?string {
global $CONTENT_MAP;
$file = $CONTENT_MAP[$slug] ?? null;
if (!$file) return null;
$path = CONTENT_DIR . $file;
if (!file_exists($path)) return null;
return markdown_to_html(file_get_contents($path));
}
/**
* Check if current page matches slug (for nav highlighting).
*/
function is_active(string $slug, string $current): string {
return ($slug === $current) ? ' class="active"' : '';
}
/**
* Get the URL for a page slug.
*/
function page_url(string $slug): string {
if ($slug === 'home') return SITE_BASE_URL;
return SITE_BASE_URL . $slug;
}