Maciej Pienczyn
53c0d24e2a
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Plain https:// URLs are now automatically converted to clickable links. Markdown [text](url) syntax continues to work without duplication. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
134 lines
3.7 KiB
Python
134 lines
3.7 KiB
Python
"""
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Simple Markdown Parser for Forum
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================================
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Converts basic markdown to safe HTML.
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Supports: bold, italic, code, links, lists, quotes, @mentions
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"""
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import re
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from markupsafe import Markup, escape
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def parse_forum_markdown(text):
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"""
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Convert markdown text to safe HTML.
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Supported syntax:
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- **bold** or __bold__
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- *italic* or _italic_
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- `inline code`
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- [link text](url)
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- - list items
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- > quotes
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- @mentions (highlighted)
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Args:
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text: Raw markdown text
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Returns:
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Markup object with safe HTML
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"""
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if not text:
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return Markup('')
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# Escape HTML first for security
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text = str(escape(text))
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# Process line by line for block elements
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lines = text.split('\n')
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result_lines = []
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in_list = False
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in_quote = False
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for line in lines:
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stripped = line.strip()
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# Quote blocks (> text)
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if stripped.startswith('> '): # Escaped >
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if not in_quote:
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result_lines.append('<blockquote class="forum-quote">')
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in_quote = True
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result_lines.append(stripped[5:]) # Remove > prefix
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continue
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elif in_quote:
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result_lines.append('</blockquote>')
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in_quote = False
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# List items (- text)
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if stripped.startswith('- '):
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if not in_list:
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result_lines.append('<ul class="forum-list">')
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in_list = True
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result_lines.append(f'<li>{stripped[2:]}</li>')
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continue
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elif in_list:
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result_lines.append('</ul>')
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in_list = False
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result_lines.append(line)
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# Close open blocks
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if in_list:
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result_lines.append('</ul>')
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if in_quote:
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result_lines.append('</blockquote>')
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text = '\n'.join(result_lines)
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# Inline formatting (order matters!)
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# Code blocks (``` ... ```)
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text = re.sub(
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r'```(.*?)```',
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r'<pre class="forum-code-block"><code>\1</code></pre>',
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text,
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flags=re.DOTALL
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)
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# Inline code (`code`)
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text = re.sub(r'`([^`]+)`', r'<code class="forum-code">\1</code>', text)
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# Bold (**text** or __text__)
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text = re.sub(r'\*\*([^*]+)\*\*', r'<strong>\1</strong>', text)
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text = re.sub(r'__([^_]+)__', r'<strong>\1</strong>', text)
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# Italic (*text* or _text_) - careful not to match bold
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text = re.sub(r'(?<!\*)\*([^*]+)\*(?!\*)', r'<em>\1</em>', text)
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text = re.sub(r'(?<!_)_([^_]+)_(?!_)', r'<em>\1</em>', text)
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# Links [text](url) - only allow http/https
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def safe_link(match):
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link_text = match.group(1)
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url = match.group(2)
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if url.startswith(('http://', 'https://', '/')):
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return f'<a href="{url}" target="_blank" rel="noopener noreferrer" class="forum-link">{link_text}</a>'
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return match.group(0) # Return original if not safe
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text = re.sub(r'\[([^\]]+)\]\(([^)]+)\)', safe_link, text)
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# Auto-link bare URLs (must come after [text](url) so already-linked URLs aren't doubled)
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text = re.sub(
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r'(?<!["\'>=/])(?<!\()https?://[^\s<\)]+',
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lambda m: f'<a href="{m.group(0)}" target="_blank" rel="noopener noreferrer" class="forum-link">{m.group(0)}</a>',
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text
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)
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# @mentions - highlight them
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text = re.sub(
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r'@([\w.\-]+)',
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r'<span class="forum-mention">@\1</span>',
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text
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)
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# Convert newlines to <br> (but not inside pre/blockquote)
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# Simple approach: just convert \n to <br>
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text = text.replace('\n', '<br>\n')
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return Markup(text)
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def register_markdown_filter(app):
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"""Register the markdown filter with Flask app."""
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app.jinja_env.filters['forum_markdown'] = parse_forum_markdown
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