--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pygments_lexer_pseudocode2/bases.py	Tue Apr 21 12:33:17 2026 +0200
@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+# :-
+# SPDX-FileCopyrightText: © 2026 Franz Glasner
+# SPDX-License-Identifier: MIT
+# :-
+r"""Some common bases for the lexers."""
+
+
+__all__ = []
+
+
+from pygments.lexer import RegexLexer
+from pygments.token import Number
+
+
+class LexBase(RegexLexer):
+
+    """A base that defines some common lexer states.
+
+    Default flags are not important.
+
+    """
+
+    tokens = {
+#
+# This state is borrowed from Pygment's Python lexer.
+#
+# SPDX-SnippetBegin
+# SPDX-License-Identifier: BSD-2-Clause
+# SPDX-SnippetCopyrightText: Copyright 2006-2023 by the Pygments team
+        'py-numbers': [
+            (r'(\d(?:_?\d)*\.(?:\d(?:_?\d)*)?|(?:\d(?:_?\d)*)?\.\d(?:_?\d)*)'
+             r'([eE][+-]?\d(?:_?\d)*)?', Number.Float),
+            (r'\d(?:_?\d)*[eE][+-]?\d(?:_?\d)*j?', Number.Float),
+            (r'0[oO](?:_?[0-7])+', Number.Oct),
+            (r'0[bB](?:_?[01])+', Number.Bin),
+            (r'0[xX](?:_?[a-fA-F0-9])+', Number.Hex),
+            (r'\d(?:_?\d)*', Number.Integer),
+        ],
+# SPDX-SnippetEnd
+    }

--- a/tox.ini	Tue Apr 21 12:15:22 2026 +0200
+++ b/tox.ini	Tue Apr 21 12:33:17 2026 +0200
@@ -3,6 +3,8 @@
 [flake8]
 per-file-ignores =
     # E122: continuation line missing indentation or outdented
+    pygments_lexer_pseudocode2/bases.py: E122
+    # E122: continuation line missing indentation or outdented
     # E131: continuation line unaligned for hanging indent
     # E261: at least two spaces before inline comment
     # E265: block comment should start with '# '