"""Toctree adapter for sphinx.environment."""
from typing import TYPE_CHECKING, Any, Iterable, List, Optional, cast
from docutils import nodes
from docutils.nodes import Element, Node
from sphinx import addnodes
from sphinx.locale import __
from sphinx.util import logging, url_re
from sphinx.util.matching import Matcher
from sphinx.util.nodes import clean_astext, process_only_nodes
if TYPE_CHECKING:
from sphinx.builders import Builder
from sphinx.environment import BuildEnvironment
logger = logging.getLogger(__name__)
class TocTree:
def __init__(self, env: "BuildEnvironment") -> None:
self.env = env
def note(self, docname: str, toctreenode: addnodes.toctree) -> None:
"""Note a TOC tree directive in a document and gather information about
file relations from it.
"""
if toctreenode['glob']:
self.env.glob_toctrees.add(docname)
if toctreenode.get('numbered'):
self.env.numbered_toctrees.add(docname)
includefiles = toctreenode['includefiles']
for includefile in includefiles:
# note that if the included file is rebuilt, this one must be
# too (since the TOC of the included file could have changed)
self.env.files_to_rebuild.setdefault(includefile, set()).add(docname)
self.env.toctree_includes.setdefault(docname, []).extend(includefiles)
def resolve(self, docname: str, builder: "Builder", toctree: addnodes.toctree,
prune: bool = True, maxdepth: int = 0, titles_only: bool = False,
collapse: bool = False, includehidden: bool = False) -> Optional[Element]:
"""Resolve a *toctree* node into individual bullet lists with titles
as items, returning None (if no containing titles are found) or
a new node.
If *prune* is True, the tree is pruned to *maxdepth*, or if that is 0,
to the value of the *maxdepth* option on the *toctree* node.
If *titles_only* is True, only toplevel document titles will be in the
resulting tree.
If *collapse* is True, all branches not containing docname will
be collapsed.
"""
if toctree.get('hidden', False) and not includehidden:
return None
# For reading the following two helper function, it is useful to keep
# in mind the node structure of a toctree (using HTML-like node names
# for brevity):
#
# <ul>
# <li>
# <p><a></p>
# <p><a></p>
# ...
# <ul>
# ...
# </ul>
# </li>
# </ul>
#
# The transformation is made in two passes in order to avoid
# interactions between marking and pruning the tree (see bug #1046).
toctree_ancestors = self.get_toctree_ancestors(docname)
excluded = Matcher(self.env.config.exclude_patterns)
def _toctree_add_classes(node: Element, depth: int) -> None:
"""Add 'toctree-l%d' and 'current' classes to the toctree."""
for subnode in node.children:
if isinstance(subnode, (addnodes.compact_paragraph,
nodes.list_item)):
# for <p> and <li>, indicate the depth level and recurse
subnode['classes'].append('toctree-l%d' % (depth - 1))
_toctree_add_classes(subnode, depth)
elif isinstance(subnode, nodes.bullet_list):
# for <ul>, just recurse
_toctree_add_classes(subnode, depth + 1)
elif isinstance(subnode, nodes.reference):
# for <a>, identify which entries point to the current
# document and therefore may not be collapsed
if subnode['refuri'] == docname:
if not subnode['anchorname']:
# give the whole branch a 'current' class
# (useful for styling it differently)
branchnode: Element = subnode
while branchnode:
branchnode['classes'].append('current')
branchnode = branchnode.parent
# mark the list_item as "on current page"
if subnode.parent.parent.get('iscurrent'):
# but only if it's not already done
return
while subnode:
subnode['iscurrent'] = True
subnode = subnode.parent
def _entries_from_toctree(toctreenode: addnodes.toctree, parents: List[str],
separate: bool = False, subtree: bool = False
) -> List[Element]:
"""Return TOC entries for a toctree node."""
refs = [(e[0], e[1]) for e in toctreenode['entries']]
entries: List[Element] = []
for (title, ref) in refs:
try:
refdoc = None
if url_re.match(ref):
if title is None:
title = ref
reference = nodes.reference('', '', internal=False,
refuri=ref, anchorname='',
*[nodes.Text(title)])
para = addnodes.compact_paragraph('', '', reference)
item = nodes.list_item('', para)
toc = nodes.bullet_list('', item)
elif ref == 'self':
# 'self' refers to the document from which this
# toctree originates
ref = toctreenode['parent']
if not title:
title = clean_astext(self.env.titles[ref])
reference = nodes.reference('', '', internal=True,
refuri=ref,
anchorname='',
*[nodes.Text(title)])
para = addnodes.compact_paragraph('', '', reference)
item = nodes.list_item('', para)
# don't show subitems
toc = nodes.bullet_list('', item)
else:
if ref in parents:
logger.warning(__('circular toctree references '
'detected, ignoring: %s <- %s'),
ref, ' <- '.join(parents),
location=ref, type='toc', subtype='circular')
continue
refdoc = ref
toc = self.env.tocs[ref].deepcopy()
maxdepth = self.env.metadata[ref].get('tocdepth', 0)
if ref not in toctree_ancestors or (prune and maxdepth > 0):
self._toctree_prune(toc, 2, maxdepth, collapse)
process_only_nodes(toc, builder.tags)
if title and toc.children and len(toc.children) == 1:
child = toc.children[0]
for refnode in child.findall(nodes.reference):
if refnode['refuri'] == ref and \
not refnode['anchorname']:
refnode.children = [nodes.Text(title)]
if not toc.children:
# empty toc means: no titles will show up in the toctree
logger.warning(__('toctree contains reference to document %r that '
'doesn\'t have a title: no link will be generated'),
ref, location=toctreenode)
except KeyError:
# this is raised if the included file does not exist
if excluded(self.env.doc2path(ref, None)):
message = __('toctree contains reference to excluded document %r')
else:
message = __('toctree contains reference to nonexisting document %r')
logger.warning(message, ref, location=toctreenode)
else:
# if titles_only is given, only keep the main title and
# sub-toctrees
if titles_only:
# children of toc are:
# - list_item + compact_paragraph + (reference and subtoc)
# - only + subtoc
# - toctree
children = cast(Iterable[nodes.Element], toc)
# delete everything but the toplevel title(s)
# and toctrees
for toplevel in children:
# nodes with length 1 don't have any children anyway
if len(toplevel) > 1:
subtrees = list(toplevel.findall(addnodes.toctree))
if subtrees:
toplevel[1][:] = subtrees # type: ignore
else:
toplevel.pop(1)
# resolve all sub-toctrees
for subtocnode in list(toc.findall(addnodes.toctree)):
if not (subtocnode.get('hidden', False) and
not includehidden):
i = subtocnode.parent.index(subtocnode) + 1
for entry in _entries_from_toctree(
subtocnode, [refdoc] + parents,
subtree=True):
subtocnode.parent.insert(i, entry)
i += 1
subtocnode.parent.remove(subtocnode)
if separate:
entries.append(toc)
else:
children = cast(Iterable[nodes.Element], toc)
entries.extend(children)
if not subtree and not separate:
ret = nodes.bullet_list()
ret += entries
return [ret]
return entries
maxdepth = maxdepth or toctree.get('maxdepth', -1)
if not titles_only and toctree.get('titlesonly', False):
titles_only = True
if not includehidden and toctree.get('includehidden', False):
includehidden = True
# NOTE: previously, this was separate=True, but that leads to artificial
# separation when two or more toctree entries form a logical unit, so
# separating mode is no longer used -- it's kept here for history's sake
tocentries = _entries_from_toctree(toctree, [], separate=False)
if not tocentries:
return None
newnode = addnodes.compact_paragraph('', '')
caption = toctree.attributes.get('caption')
if caption:
caption_node = nodes.title(caption, '', *[nodes.Text(caption)])
caption_node.line = toctree.line
caption_node.source = toctree.source
caption_node.rawsource = toctree['rawcaption']
if hasattr(toctree, 'uid'):
# move uid to caption_node to translate it
caption_node.uid = toctree.uid # type: ignore
del toctree.uid # type: ignore
newnode += caption_node
newnode.extend(tocentries)
newnode['toctree'] = True
# prune the tree to maxdepth, also set toc depth and current classes
_toctree_add_classes(newnode, 1)
self._toctree_prune(newnode, 1, maxdepth if prune else 0, collapse)
if isinstance(newnode[-1], nodes.Element) and len(newnode[-1]) == 0: # No titles found
return None
# set the target paths in the toctrees (they are not known at TOC
# generation time)
for refnode in newnode.findall(nodes.reference):
if not url_re.match(refnode['refuri']):
refnode['refuri'] = builder.get_relative_uri(
docname, refnode['refuri']) + refnode['anchorname']
return newnode
def get_toctree_ancestors(self, docname: str) -> List[str]:
parent = {}
for p, children in self.env.toctree_includes.items():
for child in children:
parent[child] = p
ancestors: List[str] = []
d = docname
while d in parent and d not in ancestors:
ancestors.append(d)
d = parent[d]
return ancestors
def _toctree_prune(self, node: Element, depth: int, maxdepth: int, collapse: bool = False
) -> None:
"""Utility: Cut a TOC at a specified depth."""
for subnode in node.children[:]:
if isinstance(subnode, (addnodes.compact_paragraph,
nodes.list_item)):
# for <p> and <li>, just recurse
self._toctree_prune(subnode, depth, maxdepth, collapse)
elif isinstance(subnode, nodes.bullet_list):
# for <ul>, determine if the depth is too large or if the
# entry is to be collapsed
if maxdepth > 0 and depth > maxdepth:
subnode.parent.replace(subnode, [])
else:
# cull sub-entries whose parents aren't 'current'
if (collapse and depth > 1 and
'iscurrent' not in subnode.parent):
subnode.parent.remove(subnode)
else:
# recurse on visible children
self._toctree_prune(subnode, depth + 1, maxdepth, collapse)
def get_toc_for(self, docname: str, builder: "Builder") -> Node:
"""Return a TOC nodetree -- for use on the same page only!"""
tocdepth = self.env.metadata[docname].get('tocdepth', 0)
try:
toc = self.env.tocs[docname].deepcopy()
self._toctree_prune(toc, 2, tocdepth)
except KeyError:
# the document does not exist anymore: return a dummy node that
# renders to nothing
return nodes.paragraph()
process_only_nodes(toc, builder.tags)
for node in toc.findall(nodes.reference):
node['refuri'] = node['anchorname'] or '#'
return toc
def get_toctree_for(self, docname: str, builder: "Builder", collapse: bool,
**kwargs: Any) -> Optional[Element]:
"""Return the global TOC nodetree."""
doctree = self.env.get_doctree(self.env.config.root_doc)
toctrees: List[Element] = []
if 'includehidden' not in kwargs:
kwargs['includehidden'] = True
if 'maxdepth' not in kwargs or not kwargs['maxdepth']:
kwargs['maxdepth'] = 0
else:
kwargs['maxdepth'] = int(kwargs['maxdepth'])
kwargs['collapse'] = collapse
for toctreenode in doctree.findall(addnodes.toctree):
toctree = self.resolve(docname, builder, toctreenode, prune=True, **kwargs)
if toctree:
toctrees.append(toctree)
if not toctrees:
return None
result = toctrees[0]
for toctree in toctrees[1:]:
result.extend(toctree.children)
return result