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env/lib/python3.10/site-packages/docutils/parsers/commonmark_wrapper.py

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+#! /usr/bin/env python3
+# :Copyright: © 2022 Günter Milde.
+# :License: Released under the terms of the `2-Clause BSD license`_, in short:
+#
+#    Copying and distribution of this file, with or without modification,
+#    are permitted in any medium without royalty provided the copyright
+#    notice and this notice are preserved.
+#    This file is offered as-is, without any warranty.
+#
+# .. _2-Clause BSD license: https://opensource.org/licenses/BSD-2-Clause
+#
+# Revision: $Revision: 9561 $
+# Date: $Date: 2024-03-14 17:34:48 +0100 (Do, 14. Mär 2024) $
+"""
+An interface for parsing CommonMark input.
+
+Select a locally installed parser from the following 3rd-party
+parser packages:
+
+:pycmark:       https://pypi.org/project/pycmark/
+:myst:          https://pypi.org/project/myst-docutils/
+:recommonmark:  https://pypi.org/project/recommonmark/ (deprecated)
+
+The first parser class that can be successfully imported is mapped to
+`commonmark_wrapper.Parser`.
+
+This module is provisional:
+the API is not settled and may change with any minor Docutils version.
+"""
+
+import docutils.parsers
+
+
+commonmark_parser_names = ('pycmark', 'myst', 'recommonmark')
+"""Names of compatible drop-in CommonMark parsers"""
+
+Parser = None
+parser_name = ''
+
+for name in commonmark_parser_names:
+    try:
+        Parser = docutils.parsers.get_parser_class(name)
+    except ImportError:
+        continue
+    parser_name = name
+    break
+
+if Parser is None:
+    raise ImportError(
+              'Parsing "CommonMark" requires one of the packages\n'
+              f'{commonmark_parser_names} available at https://pypi.org')
+
+if parser_name == 'myst':
+    if not Parser.settings_defaults:
+        Parser.settings_defaults = {}
+    Parser.settings_defaults['myst_commonmark_only'] = True