Syntax hightlihging has unexpected styles after Pygments 2.7.0

[Jun Omae]

After Pygments 2.7.0, the syntax highlighting has unexpected styles (e.g. pre, td.linenoes pre).

$ script='import pygments; from pygments.formatters.html import HtmlFormatter as F; print(pygments.__version__); print(F().get_style_defs("div.code pre"))'
$ diff -u <(/venv/pygments-2.6.1/bin/python -c "$script") \
>         <(/venv/pygments-2.7.0/bin/python -c "$script")
--- /dev/fd/63  2025-02-05 19:05:33.783629775 +0900
+++ /dev/fd/62  2025-02-05 19:05:33.783629775 +0900
@@ -1,6 +1,11 @@
-2.6.1
+2.7.0
+pre { line-height: 125%; margin: 0; }
+td.linenos pre { color: #000000; background-color: #f0f0f0; padding: 0 5px 0 5px; }
+span.linenos { color: #000000; background-color: #f0f0f0; padding: 0 5px 0 5px; }
+td.linenos pre.special { color: #000000; background-color: #ffffc0; padding: 0 5px 0 5px; }
+span.linenos.special { color: #000000; background-color: #ffffc0; padding: 0 5px 0 5px; }
 div.code pre .hll { background-color: #ffffcc }
-div.code pre  { background: #f8f8f8; }
+div.code pre { background: #f8f8f8; }
 div.code pre .c { color: #408080; font-style: italic } /* Comment */
 div.code pre .err { border: 1px solid #FF0000 } /* Error */
 div.code pre .k { color: #008000; font-weight: bold } /* Keyword */

I think we could directly invoke get_background_style_defs and get_token_style_defs in the HtmlFormatter.

trac/mimeview/pygments.py

@@ -37 +37 @@
 __all__ = ['PygmentsRenderer']
 
 
+if hasattr(HtmlFormatter, 'get_background_style_defs') and \
+        hasattr(HtmlFormatter, 'get_token_style_defs'):
+    def _get_style_defs(style, arg):  # Pygments 2.7.0+
+        lines = []
+        formatter = HtmlFormatter(style=style)
+        lines.extend(formatter.get_background_style_defs(arg))
+        lines.extend(formatter.get_token_style_defs(arg))
+        return '\n'.join(lines)
+else:
+    def _get_style_defs(style, arg):
+        formatter = HtmlFormatter(style=style)
+        return formatter.get_style_defs(arg)
+
+
 class PygmentsRenderer(Component):
     """HTML renderer for syntax highlighting based on Pygments."""
 
@@ -186 +200 @@
             req.end_headers()
             return
 
-        formatter = HtmlFormatter(style=style_cls)
-        content = formatter.get_style_defs(['div.code pre', 'table.code td'])
+        content = _get_style_defs(style_cls, ['div.code pre', 'table.code td'])
         content = content.encode('utf-8')
 
         req.send_response(200)

See also: ​https://github.com/pygments/pygments/blob/2.19.1/pygments/formatters/html.py#L516

[Jun Omae]

Fixed in [17877] and merge [17879].