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EDIT :: recommonmark_wrapper.py

#!/usr/bin/env python3 # :Copyright: © 2020 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: 9302 $ # Date: $Date: 2022-12-02 18:14:05 +0100 (Fr, 02. Dez 2022) $ """ A parser for CommonMark Markdown text using `recommonmark`__. __ https://pypi.org/project/recommonmark/ .. important:: This module is provisional * The "recommonmark" package is unmaintained and deprecated. This wrapper module will be removed in a future Docutils version. * The API is not settled and may change with any minor Docutils version. """ from docutils import Component from docutils import nodes try: # If possible, import Sphinx's 'addnodes' from sphinx import addnodes except ImportError: # stub to prevent errors if Sphinx isn't installed import sys import types class pending_xref(nodes.Inline, nodes.Element): ... # NoQA sys.modules['sphinx'] = sphinx = types.ModuleType('sphinx') sphinx.addnodes = addnodes = types.SimpleNamespace() addnodes.pending_xref = pending_xref try: import recommonmark from recommonmark.parser import CommonMarkParser except ImportError as err: raise ImportError( 'Parsing "recommonmark" Markdown flavour requires the\n' ' package https://pypi.org/project/recommonmark.' ) from err else: if recommonmark.__version__ < '0.6.0': raise ImportError('The installed version of "recommonmark" is too old.' ' Update with "pip install -U recommonmark".') # auxiliary function for `document.findall()` def is_literal(node): return isinstance(node, (nodes.literal, nodes.literal_block)) class Parser(CommonMarkParser): """MarkDown parser based on recommonmark. This parser is provisional: the API is not settled and may change with any minor Docutils version. """ supported = ('recommonmark', 'commonmark', 'markdown', 'md') """Formats this parser supports.""" config_section = 'recommonmark parser' config_section_dependencies = ('parsers',) def get_transforms(self): return Component.get_transforms(self) # + [AutoStructify] def parse(self, inputstring, document): """Use the upstream parser and clean up afterwards. """ # check for exorbitantly long lines for i, line in enumerate(inputstring.split('\n')): if len(line) > document.settings.line_length_limit: error = document.reporter.error( 'Line %d exceeds the line-length-limit.'%(i+1)) document.append(error) return # pass to upstream parser try: CommonMarkParser.parse(self, inputstring, document) except Exception as err: if document.settings.traceback: raise err error = document.reporter.error('Parsing with "recommonmark" ' 'returned the error:\n%s'%err) document.append(error) # Post-Processing # --------------- # merge adjoining Text nodes: for node in document.findall(nodes.TextElement): children = node.children i = 0 while i+1 < len(children): if (isinstance(children[i], nodes.Text) and isinstance(children[i+1], nodes.Text)): children[i] = nodes.Text(children[i]+children.pop(i+1)) children[i].parent = node else: i += 1 # add "code" class argument to literal elements (inline and block) for node in document.findall(is_literal): if 'code' not in node['classes']: node['classes'].append('code') # move "language" argument to classes for node in document.findall(nodes.literal_block): if 'language' in node.attributes: node['classes'].append(node['language']) del node['language'] # replace raw nodes if raw is not allowed if not document.settings.raw_enabled: for node in document.findall(nodes.raw): warning = document.reporter.warning('Raw content disabled.') node.parent.replace(node, warning) # drop pending_xref (Sphinx cross reference extension) for node in document.findall(addnodes.pending_xref): reference = node.children[0] if 'name' not in reference: reference['name'] = nodes.fully_normalize_name( reference.astext()) node.parent.replace(node, reference) def visit_document(self, node): """Dummy function to prevent spurious warnings. cf. https://github.com/readthedocs/recommonmark/issues/177 """ pass # Overwrite parent method with version that # doesn't pass deprecated `rawsource` argument to nodes.Text: def visit_text(self, mdnode): self.current_node.append(nodes.Text(mdnode.literal))

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