two version of R2R are hereHEADmaster

1 files changed, 955 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/docutils/writers/html4css1/__init__.py b/.venv/lib/python3.12/site-packages/docutils/writers/html4css1/__init__.py
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+# $Id: __init__.py 9558 2024-03-11 17:48:52Z milde $
+# Author: David Goodger
+# Maintainer: docutils-develop@lists.sourceforge.net
+# Copyright: This module has been placed in the public domain.
+
+"""
+Simple HyperText Markup Language document tree Writer.
+
+The output conforms to the XHTML version 1.0 Transitional DTD
+(*almost* strict).  The output contains a minimum of formatting
+information.  The cascading style sheet "html4css1.css" is required
+for proper viewing with a modern graphical browser.
+"""
+
+__docformat__ = 'reStructuredText'
+
+import os.path
+import re
+
+from docutils import frontend, nodes, writers
+from docutils.writers import _html_base
+from docutils.writers._html_base import PIL
+
+
+class Writer(writers._html_base.Writer):
+
+    supported = ('html', 'html4', 'html4css1', 'xhtml', 'xhtml10')
+    """Formats this writer supports."""
+
+    default_stylesheets = ['html4css1.css']
+    default_stylesheet_dirs = ['.',
+                               os.path.abspath(os.path.dirname(__file__)),
+                               os.path.abspath(os.path.join(
+                                   os.path.dirname(os.path.dirname(__file__)),
+                                   'html5_polyglot'))  # for math.css
+                               ]
+    default_template = os.path.join(
+        os.path.dirname(os.path.abspath(__file__)), 'template.txt')
+
+    # use a copy of the parent spec with some modifications
+    settings_spec = frontend.filter_settings_spec(
+        writers._html_base.Writer.settings_spec,
+        template=(
+            'Template file. (UTF-8 encoded, default: "%s")' % default_template,
+            ['--template'],
+            {'default': default_template, 'metavar': '<file>'}),
+        stylesheet_path=(
+            'Comma separated list of stylesheet paths. '
+            'Relative paths are expanded if a matching file is found in '
+            'the --stylesheet-dirs. With --link-stylesheet, '
+            'the path is rewritten relative to the output HTML file. '
+            '(default: "%s")' % ','.join(default_stylesheets),
+            ['--stylesheet-path'],
+            {'metavar': '<file[,file,...]>', 'overrides': 'stylesheet',
+             'validator': frontend.validate_comma_separated_list,
+             'default': default_stylesheets}),
+        stylesheet_dirs=(
+            'Comma-separated list of directories where stylesheets are found. '
+            'Used by --stylesheet-path when expanding relative path '
+            'arguments. (default: "%s")' % ','.join(default_stylesheet_dirs),
+            ['--stylesheet-dirs'],
+            {'metavar': '<dir[,dir,...]>',
+             'validator': frontend.validate_comma_separated_list,
+             'default': default_stylesheet_dirs}),
+        initial_header_level=(
+            'Specify the initial header level. Does not affect document '
+            'title & subtitle (see --no-doc-title). (default: 1 for "<h1>")',
+            ['--initial-header-level'],
+            {'choices': '1 2 3 4 5 6'.split(), 'default': '1',
+             'metavar': '<level>'}),
+        xml_declaration=(
+            'Prepend an XML declaration (default). ',
+            ['--xml-declaration'],
+            {'default': True, 'action': 'store_true',
+             'validator': frontend.validate_boolean}),
+        )
+    settings_spec = settings_spec + (
+        'HTML4 Writer Options',
+        '',
+        (('Specify the maximum width (in characters) for one-column field '
+          'names.  Longer field names will span an entire row of the table '
+          'used to render the field list.  Default is 14 characters.  '
+          'Use 0 for "no limit".',
+          ['--field-name-limit'],
+          {'default': 14, 'metavar': '<level>',
+           'validator': frontend.validate_nonnegative_int}),
+         ('Specify the maximum width (in characters) for options in option '
+          'lists.  Longer options will span an entire row of the table used '
+          'to render the option list.  Default is 14 characters.  '
+          'Use 0 for "no limit".',
+          ['--option-limit'],
+          {'default': 14, 'metavar': '<level>',
+           'validator': frontend.validate_nonnegative_int}),
+         )
+        )
+
+    config_section = 'html4css1 writer'
+
+    def __init__(self):
+        self.parts = {}
+        self.translator_class = HTMLTranslator
+
+
+class HTMLTranslator(writers._html_base.HTMLTranslator):
+    """
+    The html4css1 writer has been optimized to produce visually compact
+    lists (less vertical whitespace).  HTML's mixed content models
+    allow list items to contain "<li><p>body elements</p></li>" or
+    "<li>just text</li>" or even "<li>text<p>and body
+    elements</p>combined</li>", each with different effects.  It would
+    be best to stick with strict body elements in list items, but they
+    affect vertical spacing in older browsers (although they really
+    shouldn't).
+    The html5_polyglot writer solves this using CSS2.
+
+    Here is an outline of the optimization:
+
+    - Check for and omit <p> tags in "simple" lists: list items
+      contain either a single paragraph, a nested simple list, or a
+      paragraph followed by a nested simple list.  This means that
+      this list can be compact:
+
+          - Item 1.
+          - Item 2.
+
+      But this list cannot be compact:
+
+          - Item 1.
+
+            This second paragraph forces space between list items.
+
+          - Item 2.
+
+    - In non-list contexts, omit <p> tags on a paragraph if that
+      paragraph is the only child of its parent (footnotes & citations
+      are allowed a label first).
+
+    - Regardless of the above, in definitions, table cells, field bodies,
+      option descriptions, and list items, mark the first child with
+      'class="first"' and the last child with 'class="last"'.  The stylesheet
+      sets the margins (top & bottom respectively) to 0 for these elements.
+
+    The ``no_compact_lists`` setting (``--no-compact-lists`` command-line
+    option) disables list whitespace optimization.
+    """
+
+    # The following definitions are required for display in browsers limited
+    # to CSS1 or backwards compatible behaviour of the writer:
+
+    doctype = (
+        '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"'
+        ' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\n')
+
+    content_type = ('<meta http-equiv="Content-Type"'
+                    ' content="text/html; charset=%s" />\n')
+    content_type_mathml = ('<meta http-equiv="Content-Type"'
+                           ' content="application/xhtml+xml; charset=%s" />\n')
+
+    # encode also non-breaking space
+    special_characters = _html_base.HTMLTranslator.special_characters.copy()
+    special_characters[0xa0] = '&nbsp;'
+
+    # use character reference for dash (not valid in HTML5)
+    attribution_formats = {'dash': ('&mdash;', ''),
+                           'parentheses': ('(', ')'),
+                           'parens': ('(', ')'),
+                           'none': ('', '')}
+
+    # ersatz for first/last pseudo-classes missing in CSS1
+    def set_first_last(self, node):
+        self.set_class_on_child(node, 'first', 0)
+        self.set_class_on_child(node, 'last', -1)
+
+    # add newline after opening tag
+    def visit_address(self, node):
+        self.visit_docinfo_item(node, 'address', meta=False)
+        self.body.append(self.starttag(node, 'pre', CLASS='address'))
+
+    def depart_address(self, node):
+        self.body.append('\n</pre>\n')
+        self.depart_docinfo_item()
+
+    # ersatz for first/last pseudo-classes
+    def visit_admonition(self, node):
+        node['classes'].insert(0, 'admonition')
+        self.body.append(self.starttag(node, 'div'))
+        self.set_first_last(node)
+
+    def depart_admonition(self, node=None):
+        self.body.append('</div>\n')
+
+    # author, authors: use <br> instead of paragraphs
+    def visit_author(self, node):
+        if isinstance(node.parent, nodes.authors):
+            if self.author_in_authors:
+                self.body.append('\n<br />')
+        else:
+            self.visit_docinfo_item(node, 'author')
+
+    def depart_author(self, node):
+        if isinstance(node.parent, nodes.authors):
+            self.author_in_authors = True
+        else:
+            self.depart_docinfo_item()
+
+    def visit_authors(self, node):
+        self.visit_docinfo_item(node, 'authors')
+        self.author_in_authors = False  # initialize
+
+    def depart_authors(self, node):
+        self.depart_docinfo_item()
+
+    # use "width" argument instead of "style: 'width'":
+    def visit_colspec(self, node):
+        self.colspecs.append(node)
+        # "stubs" list is an attribute of the tgroup element:
+        node.parent.stubs.append(node.attributes.get('stub'))
+
+    def depart_colspec(self, node):
+        # write out <colgroup> when all colspecs are processed
+        if isinstance(node.next_node(descend=False, siblings=True),
+                      nodes.colspec):
+            return
+        if ('colwidths-auto' in node.parent.parent['classes']
+            or ('colwidths-auto' in self.settings.table_style
+                and 'colwidths-given' not in node.parent.parent['classes'])):
+            return
+        total_width = sum(node['colwidth'] for node in self.colspecs)
+        self.body.append(self.starttag(node, 'colgroup'))
+        for node in self.colspecs:
+            colwidth = int(node['colwidth'] * 100.0 / total_width + 0.5)
+            self.body.append(self.emptytag(node, 'col',
+                                           width='%i%%' % colwidth))
+        self.body.append('</colgroup>\n')
+
+    # Compact lists:
+    # exclude definition lists and field lists (non-compact by default)
+
+    def is_compactable(self, node):
+        return ('compact' in node['classes']
+                or (self.settings.compact_lists
+                    and 'open' not in node['classes']
+                    and (self.compact_simple
+                         or 'contents' in node.parent['classes']
+                         # TODO: self.in_contents
+                         or self.check_simple_list(node))))
+
+    # citations: Use table for bibliographic references.
+    def visit_citation(self, node):
+        self.body.append(self.starttag(node, 'table',
+                                       CLASS='docutils citation',
+                                       frame="void", rules="none"))
+        self.body.append('<colgroup><col class="label" /><col /></colgroup>\n'
+                         '<tbody valign="top">\n'
+                         '<tr>')
+        self.footnote_backrefs(node)
+
+    def depart_citation(self, node):
+        self.body.append('</td></tr>\n'
+                         '</tbody>\n</table>\n')
+
+    def visit_citation_reference(self, node):
+        href = '#'
+        if 'refid' in node:
+            href += node['refid']
+        elif 'refname' in node:
+            href += self.document.nameids[node['refname']]
+        self.body.append(self.starttag(node, 'a', suffix='[', href=href,
+                                       classes=['citation-reference']))
+
+    def depart_citation_reference(self, node):
+        self.body.append(']</a>')
+
+    # insert classifier-delimiter (not required with CSS2)
+    def visit_classifier(self, node):
+        self.body.append(' <span class="classifier-delimiter">:</span> ')
+        self.body.append(self.starttag(node, 'span', '', CLASS='classifier'))
+
+    def depart_classifier(self, node):
+        self.body.append('</span>')
+        self.depart_term(node)  # close the <dt> after last classifier
+
+    # ersatz for first/last pseudo-classes
+    def visit_compound(self, node):
+        self.body.append(self.starttag(node, 'div', CLASS='compound'))
+        if len(node) > 1:
+            node[0]['classes'].append('compound-first')
+            node[-1]['classes'].append('compound-last')
+            for child in node[1:-1]:
+                child['classes'].append('compound-middle')
+
+    def depart_compound(self, node):
+        self.body.append('</div>\n')
+
+    # ersatz for first/last pseudo-classes, no special handling of "details"
+    def visit_definition(self, node):
+        self.body.append(self.starttag(node, 'dd', ''))
+        self.set_first_last(node)
+
+    def depart_definition(self, node):
+        self.body.append('</dd>\n')
+
+    # don't add "simple" class value, no special handling of "details"
+    def visit_definition_list(self, node):
+        self.body.append(self.starttag(node, 'dl', CLASS='docutils'))
+
+    def depart_definition_list(self, node):
+        self.body.append('</dl>\n')
+
+    # no special handling of "details"
+    def visit_definition_list_item(self, node):
+        pass
+
+    def depart_definition_list_item(self, node):
+        pass
+
+    # use a table for description lists
+    def visit_description(self, node):
+        self.body.append(self.starttag(node, 'td', ''))
+        self.set_first_last(node)
+
+    def depart_description(self, node):
+        self.body.append('</td>')
+
+    # use table for docinfo
+    def visit_docinfo(self, node):
+        self.context.append(len(self.body))
+        self.body.append(self.starttag(node, 'table',
+                                       CLASS='docinfo',
+                                       frame="void", rules="none"))
+        self.body.append('<col class="docinfo-name" />\n'
+                         '<col class="docinfo-content" />\n'
+                         '<tbody valign="top">\n')
+        self.in_docinfo = True
+
+    def depart_docinfo(self, node):
+        self.body.append('</tbody>\n</table>\n')
+        self.in_docinfo = False
+        start = self.context.pop()
+        self.docinfo = self.body[start:]
+        self.body = []
+
+    def visit_docinfo_item(self, node, name, meta=True):
+        if meta:
+            meta_tag = '<meta name="%s" content="%s" />\n' \
+                       % (name, self.attval(node.astext()))
+            self.meta.append(meta_tag)
+        self.body.append(self.starttag(node, 'tr', ''))
+        self.body.append('<th class="docinfo-name">%s:</th>\n<td>'
+                         % self.language.labels[name])
+        if len(node):
+            if isinstance(node[0], nodes.Element):
+                node[0]['classes'].append('first')
+            if isinstance(node[-1], nodes.Element):
+                node[-1]['classes'].append('last')
+
+    def depart_docinfo_item(self):
+        self.body.append('</td></tr>\n')
+
+    # add newline after opening tag
+    def visit_doctest_block(self, node):
+        self.body.append(self.starttag(node, 'pre', CLASS='doctest-block'))
+
+    def depart_doctest_block(self, node):
+        self.body.append('\n</pre>\n')
+
+    # insert an NBSP into empty cells, ersatz for first/last
+    def visit_entry(self, node):
+        writers._html_base.HTMLTranslator.visit_entry(self, node)
+        if len(node) == 0:              # empty cell
+            self.body.append('&nbsp;')
+        self.set_first_last(node)
+
+    def depart_entry(self, node):
+        self.body.append(self.context.pop())
+
+    # ersatz for first/last pseudo-classes
+    def visit_enumerated_list(self, node):
+        """
+        The 'start' attribute does not conform to HTML 4.01's strict.dtd, but
+        cannot be emulated in CSS1 (HTML 5 reincludes it).
+        """
+        atts = {}
+        if 'start' in node:
+            atts['start'] = node['start']
+        if 'enumtype' in node:
+            atts['class'] = node['enumtype']
+        # @@@ To do: prefix, suffix. How? Change prefix/suffix to a
+        # single "format" attribute? Use CSS2?
+        old_compact_simple = self.compact_simple
+        self.context.append((self.compact_simple, self.compact_p))
+        self.compact_p = None
+        self.compact_simple = self.is_compactable(node)
+        if self.compact_simple and not old_compact_simple:
+            atts['class'] = (atts.get('class', '') + ' simple').strip()
+        self.body.append(self.starttag(node, 'ol', **atts))
+
+    def depart_enumerated_list(self, node):
+        self.compact_simple, self.compact_p = self.context.pop()
+        self.body.append('</ol>\n')
+
+    # use table for field-list:
+    def visit_field(self, node):
+        self.body.append(self.starttag(node, 'tr', '', CLASS='field'))
+
+    def depart_field(self, node):
+        self.body.append('</tr>\n')
+
+    def visit_field_body(self, node):
+        self.body.append(self.starttag(node, 'td', '', CLASS='field-body'))
+        self.set_class_on_child(node, 'first', 0)
+        field = node.parent
+        if (self.compact_field_list
+            or isinstance(field.parent, nodes.docinfo)
+            or field.parent.index(field) == len(field.parent) - 1):
+            # If we are in a compact list, the docinfo, or if this is
+            # the last field of the field list, do not add vertical
+            # space after last element.
+            self.set_class_on_child(node, 'last', -1)
+
+    def depart_field_body(self, node):
+        self.body.append('</td>\n')
+
+    def visit_field_list(self, node):
+        self.context.append((self.compact_field_list, self.compact_p))
+        self.compact_p = None
+        if 'compact' in node['classes']:
+            self.compact_field_list = True
+        elif (self.settings.compact_field_lists
+              and 'open' not in node['classes']):
+            self.compact_field_list = True
+        if self.compact_field_list:
+            for field in node:
+                field_body = field[-1]
+                assert isinstance(field_body, nodes.field_body)
+                children = [n for n in field_body
+                            if not isinstance(n, nodes.Invisible)]
+                if not (len(children) == 0
+                        or len(children) == 1
+                        and isinstance(children[0],
+                                       (nodes.paragraph, nodes.line_block))):
+                    self.compact_field_list = False
+                    break
+        self.body.append(self.starttag(node, 'table', frame='void',
+                                       rules='none',
+                                       CLASS='docutils field-list'))
+        self.body.append('<col class="field-name" />\n'
+                         '<col class="field-body" />\n'
+                         '<tbody valign="top">\n')
+
+    def depart_field_list(self, node):
+        self.body.append('</tbody>\n</table>\n')
+        self.compact_field_list, self.compact_p = self.context.pop()
+
+    def visit_field_name(self, node):
+        atts = {}
+        if self.in_docinfo:
+            atts['class'] = 'docinfo-name'
+        else:
+            atts['class'] = 'field-name'
+        if (self.settings.field_name_limit
+            and len(node.astext()) > self.settings.field_name_limit):
+            atts['colspan'] = 2
+            self.context.append('</tr>\n'
+                                + self.starttag(node.parent, 'tr', '',
+                                                CLASS='field')
+                                + '<td>&nbsp;</td>')
+        else:
+            self.context.append('')
+        self.body.append(self.starttag(node, 'th', '', **atts))
+
+    def depart_field_name(self, node):
+        self.body.append(':</th>')
+        self.body.append(self.context.pop())
+
+    # use table for footnote text
+    def visit_footnote(self, node):
+        self.body.append(self.starttag(node, 'table',
+                                       CLASS='docutils footnote',
+                                       frame="void", rules="none"))
+        self.body.append('<colgroup><col class="label" /><col /></colgroup>\n'
+                         '<tbody valign="top">\n'
+                         '<tr>')
+        self.footnote_backrefs(node)
+
+    def footnote_backrefs(self, node):
+        backlinks = []
+        backrefs = node['backrefs']
+        if self.settings.footnote_backlinks and backrefs:
+            if len(backrefs) == 1:
+                self.context.append('')
+                self.context.append('</a>')
+                self.context.append('<a class="fn-backref" href="#%s">'
+                                    % backrefs[0])
+            else:
+                for (i, backref) in enumerate(backrefs, 1):
+                    backlinks.append('<a class="fn-backref" href="#%s">%s</a>'
+                                     % (backref, i))
+                self.context.append('<em>(%s)</em> ' % ', '.join(backlinks))
+                self.context += ['', '']
+        else:
+            self.context.append('')
+            self.context += ['', '']
+        # If the node does not only consist of a label.
+        if len(node) > 1:
+            # If there are preceding backlinks, we do not set class
+            # 'first', because we need to retain the top-margin.
+            if not backlinks:
+                node[1]['classes'].append('first')
+            node[-1]['classes'].append('last')
+
+    def depart_footnote(self, node):
+        self.body.append('</td></tr>\n'
+                         '</tbody>\n</table>\n')
+
+    # insert markers in text (pseudo-classes are not supported in CSS1):
+    def visit_footnote_reference(self, node):
+        href = '#' + node['refid']
+        format = self.settings.footnote_references
+        if format == 'brackets':
+            suffix = '['
+            self.context.append(']')
+        else:
+            assert format == 'superscript'
+            suffix = '<sup>'
+            self.context.append('</sup>')
+        self.body.append(self.starttag(node, 'a', suffix,
+                                       CLASS='footnote-reference', href=href))
+
+    def depart_footnote_reference(self, node):
+        self.body.append(self.context.pop() + '</a>')
+
+    # just pass on generated text
+    def visit_generated(self, node):
+        pass
+
+    # Backwards-compatibility implementation:
+    # * Do not use <video>,
+    # * don't embed images,
+    # * use <object> instead of <img> for SVG.
+    #   (SVG not supported by IE up to version 8,
+    #   html4css1 strives for IE6 compatibility.)
+    object_image_types = {'.svg': 'image/svg+xml',
+                          '.swf': 'application/x-shockwave-flash',
+                          '.mp4': 'video/mp4',
+                          '.webm': 'video/webm',
+                          '.ogg': 'video/ogg',
+                          }
+
+    def visit_image(self, node):
+        atts = {}
+        uri = node['uri']
+        ext = os.path.splitext(uri)[1].lower()
+        if ext in self.object_image_types:
+            atts['data'] = uri
+            atts['type'] = self.object_image_types[ext]
+        else:
+            atts['src'] = uri
+            atts['alt'] = node.get('alt', uri)
+        # image size
+        if 'width' in node:
+            atts['width'] = node['width']
+        if 'height' in node:
+            atts['height'] = node['height']
+        if 'scale' in node:
+            if (PIL and ('width' not in node or 'height' not in node)
+                and self.settings.file_insertion_enabled):
+                imagepath = self.uri2imagepath(uri)
+                try:
+                    with PIL.Image.open(imagepath) as img:
+                        img_size = img.size
+                except (OSError, UnicodeEncodeError):
+                    pass  # TODO: warn/info?
+                else:
+                    self.settings.record_dependencies.add(
+                        imagepath.replace('\\', '/'))
+                    if 'width' not in atts:
+                        atts['width'] = '%dpx' % img_size[0]
+                    if 'height' not in atts:
+                        atts['height'] = '%dpx' % img_size[1]
+            for att_name in 'width', 'height':
+                if att_name in atts:
+                    match = re.match(r'([0-9.]+)(\S*)$', atts[att_name])
+                    assert match
+                    atts[att_name] = '%s%s' % (
+                        float(match.group(1)) * (float(node['scale']) / 100),
+                        match.group(2))
+        style = []
+        for att_name in 'width', 'height':
+            if att_name in atts:
+                if re.match(r'^[0-9.]+$', atts[att_name]):
+                    # Interpret unitless values as pixels.
+                    atts[att_name] += 'px'
+                style.append('%s: %s;' % (att_name, atts[att_name]))
+                del atts[att_name]
+        if style:
+            atts['style'] = ' '.join(style)
+        # No newlines around inline images.
+        if (not isinstance(node.parent, nodes.TextElement)
+            or isinstance(node.parent, nodes.reference)
+            and not isinstance(node.parent.parent, nodes.TextElement)):
+            suffix = '\n'
+        else:
+            suffix = ''
+        if 'align' in node:
+            atts['class'] = 'align-%s' % node['align']
+        if ext in self.object_image_types:
+            # do NOT use an empty tag: incorrect rendering in browsers
+            self.body.append(self.starttag(node, 'object', '', **atts)
+                             + node.get('alt', uri) + '</object>' + suffix)
+        else:
+            self.body.append(self.emptytag(node, 'img', suffix, **atts))
+
+    def depart_image(self, node):
+        pass
+
+    # use table for footnote text,
+    # context added in footnote_backrefs.
+    def visit_label(self, node):
+        self.body.append(self.starttag(node, 'td', '%s[' % self.context.pop(),
+                                       CLASS='label'))
+
+    def depart_label(self, node):
+        self.body.append(f']{self.context.pop()}</td><td>{self.context.pop()}')
+
+    # ersatz for first/last pseudo-classes
+    def visit_list_item(self, node):
+        self.body.append(self.starttag(node, 'li', ''))
+        if len(node):
+            node[0]['classes'].append('first')
+
+    def depart_list_item(self, node):
+        self.body.append('</li>\n')
+
+    # use <tt> (not supported by HTML5),
+    # cater for limited styling options in CSS1 using hard-coded NBSPs
+    def visit_literal(self, node):
+        # special case: "code" role
+        classes = node['classes']
+        if 'code' in classes:
+            # filter 'code' from class arguments
+            node['classes'] = [cls for cls in classes if cls != 'code']
+            self.body.append(self.starttag(node, 'code', ''))
+            return
+        self.body.append(
+            self.starttag(node, 'tt', '', CLASS='docutils literal'))
+        text = node.astext()
+        for token in self.words_and_spaces.findall(text):
+            if token.strip():
+                # Protect text like "--an-option" and the regular expression
+                # ``[+]?(\d+(\.\d*)?|\.\d+)`` from bad line wrapping
+                if self.in_word_wrap_point.search(token):
+                    self.body.append('<span class="pre">%s</span>'
+                                     % self.encode(token))
+                else:
+                    self.body.append(self.encode(token))
+            elif token in ('\n', ' '):
+                # Allow breaks at whitespace:
+                self.body.append(token)
+            else:
+                # Protect runs of multiple spaces; the last space can wrap:
+                self.body.append('&nbsp;' * (len(token) - 1) + ' ')
+        self.body.append('</tt>')
+        # Content already processed:
+        raise nodes.SkipNode
+
+    def depart_literal(self, node):
+        # skipped unless literal element is from "code" role:
+        self.body.append('</code>')
+
+    # add newline after wrapper tags, don't use <code> for code
+    def visit_literal_block(self, node):
+        self.body.append(self.starttag(node, 'pre', CLASS='literal-block'))
+
+    def depart_literal_block(self, node):
+        self.body.append('\n</pre>\n')
+
+    # use table for option list
+    def visit_option_group(self, node):
+        atts = {}
+        if (self.settings.option_limit
+            and len(node.astext()) > self.settings.option_limit):
+            atts['colspan'] = 2
+            self.context.append('</tr>\n<tr><td>&nbsp;</td>')
+        else:
+            self.context.append('')
+        self.body.append(
+            self.starttag(node, 'td', CLASS='option-group', **atts))
+        self.body.append('<kbd>')
+        self.context.append(0)          # count number of options
+
+    def depart_option_group(self, node):
+        self.context.pop()
+        self.body.append('</kbd></td>\n')
+        self.body.append(self.context.pop())
+
+    def visit_option_list(self, node):
+        self.body.append(
+              self.starttag(node, 'table', CLASS='docutils option-list',
+                            frame="void", rules="none"))
+        self.body.append('<col class="option" />\n'
+                         '<col class="description" />\n'
+                         '<tbody valign="top">\n')
+
+    def depart_option_list(self, node):
+        self.body.append('</tbody>\n</table>\n')
+
+    def visit_option_list_item(self, node):
+        self.body.append(self.starttag(node, 'tr', ''))
+
+    def depart_option_list_item(self, node):
+        self.body.append('</tr>\n')
+
+    # Omit <p> tags to produce visually compact lists (less vertical
+    # whitespace) as CSS styling requires CSS2.
+    def should_be_compact_paragraph(self, node):
+        """
+        Determine if the <p> tags around paragraph ``node`` can be omitted.
+        """
+        if (isinstance(node.parent, nodes.document)
+            or isinstance(node.parent, nodes.compound)):
+            # Never compact paragraphs in document or compound.
+            return False
+        for key, value in node.attlist():
+            if (node.is_not_default(key)
+                and not (key == 'classes'
+                         and value in ([], ['first'],
+                                       ['last'], ['first', 'last']))):
+                # Attribute which needs to survive.
+                return False
+        first = isinstance(node.parent[0], nodes.label)  # skip label
+        for child in node.parent.children[first:]:
+            # only first paragraph can be compact
+            if isinstance(child, nodes.Invisible):
+                continue
+            if child is node:
+                break
+            return False
+        parent_length = len([n for n in node.parent if not isinstance(
+            n, (nodes.Invisible, nodes.label))])
+        if (self.compact_simple
+            or self.compact_field_list
+            or self.compact_p and parent_length == 1):
+            return True
+        return False
+
+    def visit_paragraph(self, node):
+        if self.should_be_compact_paragraph(node):
+            self.context.append('')
+        else:
+            self.body.append(self.starttag(node, 'p', ''))
+            self.context.append('</p>\n')
+
+    def depart_paragraph(self, node):
+        self.body.append(self.context.pop())
+        self.report_messages(node)
+
+    # ersatz for first/last pseudo-classes
+    def visit_sidebar(self, node):
+        self.body.append(
+            self.starttag(node, 'div', CLASS='sidebar'))
+        self.set_first_last(node)
+        self.in_sidebar = True
+
+    def depart_sidebar(self, node):
+        self.body.append('</div>\n')
+        self.in_sidebar = False
+
+    # <sub> not allowed in <pre>
+    def visit_subscript(self, node):
+        if isinstance(node.parent, nodes.literal_block):
+            self.body.append(self.starttag(node, 'span', '',
+                                           CLASS='subscript'))
+        else:
+            self.body.append(self.starttag(node, 'sub', ''))
+
+    def depart_subscript(self, node):
+        if isinstance(node.parent, nodes.literal_block):
+            self.body.append('</span>')
+        else:
+            self.body.append('</sub>')
+
+    # Use <h*> for subtitles (deprecated in HTML 5)
+    def visit_subtitle(self, node):
+        if isinstance(node.parent, nodes.sidebar):
+            self.body.append(self.starttag(node, 'p', '',
+                                           CLASS='sidebar-subtitle'))
+            self.context.append('</p>\n')
+        elif isinstance(node.parent, nodes.document):
+            self.body.append(self.starttag(node, 'h2', '', CLASS='subtitle'))
+            self.context.append('</h2>\n')
+            self.in_document_title = len(self.body)
+        elif isinstance(node.parent, nodes.section):
+            tag = 'h%s' % (self.section_level + self.initial_header_level - 1)
+            self.body.append(
+                self.starttag(node, tag, '', CLASS='section-subtitle')
+                + self.starttag({}, 'span', '', CLASS='section-subtitle'))
+            self.context.append('</span></%s>\n' % tag)
+
+    def depart_subtitle(self, node):
+        self.body.append(self.context.pop())
+        if self.in_document_title:
+            self.subtitle = self.body[self.in_document_title:-1]
+            self.in_document_title = 0
+            self.body_pre_docinfo.extend(self.body)
+            self.html_subtitle.extend(self.body)
+            del self.body[:]
+
+    # <sup> not allowed in <pre> in HTML 4
+    def visit_superscript(self, node):
+        if isinstance(node.parent, nodes.literal_block):
+            self.body.append(self.starttag(node, 'span', '',
+                                           CLASS='superscript'))
+        else:
+            self.body.append(self.starttag(node, 'sup', ''))
+
+    def depart_superscript(self, node):
+        if isinstance(node.parent, nodes.literal_block):
+            self.body.append('</span>')
+        else:
+            self.body.append('</sup>')
+
+    # <tt> element deprecated in HTML 5
+    def visit_system_message(self, node):
+        self.body.append(self.starttag(node, 'div', CLASS='system-message'))
+        self.body.append('<p class="system-message-title">')
+        backref_text = ''
+        if len(node['backrefs']):
+            backrefs = node['backrefs']
+            if len(backrefs) == 1:
+                backref_text = ('; <em><a href="#%s">backlink</a></em>'
+                                % backrefs[0])
+            else:
+                i = 1
+                backlinks = []
+                for backref in backrefs:
+                    backlinks.append('<a href="#%s">%s</a>' % (backref, i))
+                    i += 1
+                backref_text = ('; <em>backlinks: %s</em>'
+                                % ', '.join(backlinks))
+        if node.hasattr('line'):
+            line = ', line %s' % node['line']
+        else:
+            line = ''
+        self.body.append('System Message: %s/%s '
+                         '(<tt class="docutils">%s</tt>%s)%s</p>\n'
+                         % (node['type'], node['level'],
+                            self.encode(node['source']), line, backref_text))
+
+    def depart_system_message(self, node):
+        self.body.append('</div>\n')
+
+    # "hard coded" border setting
+    def visit_table(self, node):
+        self.context.append(self.compact_p)
+        self.compact_p = True
+        atts = {'border': 1}
+        classes = ['docutils', self.settings.table_style]
+        if 'align' in node:
+            classes.append('align-%s' % node['align'])
+        if 'width' in node:
+            atts['style'] = 'width: %s' % node['width']
+        self.body.append(
+            self.starttag(node, 'table', CLASS=' '.join(classes), **atts))
+
+    def depart_table(self, node):
+        self.compact_p = self.context.pop()
+        self.body.append('</table>\n')
+
+    # hard-coded vertical alignment
+    def visit_tbody(self, node):
+        self.body.append(self.starttag(node, 'tbody', valign='top'))
+
+    def depart_tbody(self, node):
+        self.body.append('</tbody>\n')
+
+    # no special handling of "details" in definition list
+    def visit_term(self, node):
+        self.body.append(self.starttag(node, 'dt', '',
+                                       classes=node.parent['classes'],
+                                       ids=node.parent['ids']))
+
+    def depart_term(self, node):
+        # Nest (optional) classifier(s) in the <dt> element
+        if node.next_node(nodes.classifier, descend=False, siblings=True):
+            return  # skip (depart_classifier() calls this function again)
+        self.body.append('</dt>\n')
+
+    # hard-coded vertical alignment
+    def visit_thead(self, node):
+        self.body.append(self.starttag(node, 'thead', valign='bottom'))
+
+    def depart_thead(self, node):
+        self.body.append('</thead>\n')
+
+    # auxiliary method, called by visit_title()
+    # "with-subtitle" class, no ARIA roles
+    def section_title_tags(self, node):
+        classes = []
+        h_level = self.section_level + self.initial_header_level - 1
+        if (len(node.parent) >= 2
+            and isinstance(node.parent[1], nodes.subtitle)):
+            classes.append('with-subtitle')
+        if h_level > 6:
+            classes.append('h%i' % h_level)
+        tagname = 'h%i' % min(h_level, 6)
+        start_tag = self.starttag(node, tagname, '', classes=classes)
+        if node.hasattr('refid'):
+            atts = {}
+            atts['class'] = 'toc-backref'
+            atts['href'] = '#' + node['refid']
+            start_tag += self.starttag({}, 'a', '', **atts)
+            close_tag = '</a></%s>\n' % tagname
+        else:
+            close_tag = '</%s>\n' % tagname
+        return start_tag, close_tag
+
+
+class SimpleListChecker(writers._html_base.SimpleListChecker):
+
+    """
+    Raise `nodes.NodeFound` if non-simple list item is encountered.
+
+    Here "simple" means a list item containing nothing other than a single
+    paragraph, a simple list, or a paragraph followed by a simple list.
+    """
+
+    def visit_list_item(self, node):
+        children = []
+        for child in node.children:
+            if not isinstance(child, nodes.Invisible):
+                children.append(child)
+        if (children and isinstance(children[0], nodes.paragraph)
+            and (isinstance(children[-1], nodes.bullet_list)
+                 or isinstance(children[-1], nodes.enumerated_list))):
+            children.pop()
+        if len(children) <= 1:
+            return
+        else:
+            raise nodes.NodeFound
+
+    # def visit_bullet_list(self, node):
+    #     pass
+
+    # def visit_enumerated_list(self, node):
+    #     pass
+
+    def visit_paragraph(self, node):
+        raise nodes.SkipNode
+
+    def visit_definition_list(self, node):
+        raise nodes.NodeFound
+
+    def visit_docinfo(self, node):
+        raise nodes.NodeFound