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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: 9048 $
# Date: $Date: 2022-03-29 23:50:15 +0200 (Di, 29. Mär 2022) $
"""
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/pycmark/
:recommonmark: https://pypi.org/project/pycmark/ (unmaintained, 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
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