82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
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"""Mini-Markdown-Renderer für PM-Bodies — Python-Spiegelbild der
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JS-Funktion ``renderPmBody`` in ``v2/screens/aktuelle-themen.html``.
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Der Renderer interpretiert eine kleine Untermenge von Markdown:
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- ``**bold**`` und ``__bold__`` → ``<strong>...</strong>``
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- ``*italic*`` und ``_italic_`` → ``<em>...</em>`` (vorsichtig — nur
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wenn nicht zwischen Ziffern oder Word-Charakters)
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- Zeilen, die mit ``- `` oder ``* `` beginnen → ``<ul><li>...</li></ul>``
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- Doppel-Newlines trennen Absätze → ``<p>...</p>``
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- Einzelne Newlines innerhalb eines Absatzes → ``<br>``
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- HTML-Special-Chars (``&``, ``<``, ``>``) werden escaped.
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Die Python-Variante existiert primär zum Testen. Im Produktiv-Frontend
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wird die JS-Variante benutzt (kein Round-Trip zum Server).
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"""
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from __future__ import annotations
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import re
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# 1) HTML-Escape (analog zur JS-Variante, in dieser Reihenfolge)
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def _html_escape(s: str) -> str:
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return s.replace("&", "&").replace("<", "<").replace(">", ">")
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# 2) Bold-Marker: **...** und __...__
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_RE_BOLD_STAR = re.compile(r"\*\*([^*\n]+?)\*\*")
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_RE_BOLD_UNDER = re.compile(r"__([^_\n]+?)__")
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# 3) Italic-Marker: *…* und _…_, jeweils nicht zw. Word-Chars
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_RE_ITALIC_STAR = re.compile(r"(?<![*\w])\*([^*\n]+?)\*(?![*\w])")
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_RE_ITALIC_UNDER = re.compile(r"(?<![_\w])_([^_\n]+?)_(?![_\w])")
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# 4) Listen-Bullet
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_RE_BULLET = re.compile(r"^\s*[-*]\s+")
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def render_pm_body(body: str) -> str:
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"""Render Mini-Markdown zu HTML. Leere/None-Eingabe → leerer String."""
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if not body:
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return ""
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s = _html_escape(body)
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s = _RE_BOLD_STAR.sub(r"<strong>\1</strong>", s)
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s = _RE_BOLD_UNDER.sub(r"<strong>\1</strong>", s)
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s = _RE_ITALIC_STAR.sub(r"<em>\1</em>", s)
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s = _RE_ITALIC_UNDER.sub(r"<em>\1</em>", s)
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# Listen: konsekutive "- "/"* "-Zeilen zu einem <ul> zusammenfassen
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out_lines = []
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in_list = False
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for line in s.split("\n"):
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if _RE_BULLET.match(line):
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if not in_list:
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out_lines.append('<ul style="margin:0.5em 0;padding-left:1.4em;">')
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in_list = True
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out_lines.append("<li>" + _RE_BULLET.sub("", line) + "</li>")
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else:
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if in_list:
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out_lines.append("</ul>")
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in_list = False
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out_lines.append(line)
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if in_list:
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out_lines.append("</ul>")
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s = "\n".join(out_lines)
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# Paragraphen-Split bei doppelten Newlines, einzelne → <br>
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paras = re.split(r"\n\s*\n", s)
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rendered = []
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for p in paras:
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trimmed = p.strip()
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if not trimmed:
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continue
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if trimmed.startswith("<"):
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rendered.append(trimmed)
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else:
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rendered.append(
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'<p style="margin:0 0 0.9em;">'
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+ trimmed.replace("\n", "<br>")
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+ "</p>"
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)
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return "\n".join(rendered)
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