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# $Id: parts.py 9038 2022-03-05 23:31:46Z milde $
# Authors: David Goodger <goodger@python.org>; Ueli Schlaepfer; Dmitry Jemerov
# Copyright: This module has been placed in the public domain.
"""
Transforms related to document parts.
"""
__docformat__ = 'reStructuredText'
import sys
from docutils import nodes
from docutils.transforms import Transform
class SectNum(Transform):
"""
Automatically assigns numbers to the titles of document sections.
It is possible to limit the maximum section level for which the numbers
are added. For those sections that are auto-numbered, the "autonum"
attribute is set, informing the contents table generator that a different
form of the TOC should be used.
"""
default_priority = 710
"""Should be applied before `Contents`."""
def apply(self):
self.maxdepth = self.startnode.details.get('depth', None)
self.startvalue = self.startnode.details.get('start', 1)
self.prefix = self.startnode.details.get('prefix', '')
self.suffix = self.startnode.details.get('suffix', '')
self.startnode.parent.remove(self.startnode)
if self.document.settings.sectnum_xform:
if self.maxdepth is None:
self.maxdepth = sys.maxsize
self.update_section_numbers(self.document)
else: # store details for eventual section numbering by the writer
self.document.settings.sectnum_depth = self.maxdepth
self.document.settings.sectnum_start = self.startvalue
self.document.settings.sectnum_prefix = self.prefix
self.document.settings.sectnum_suffix = self.suffix
def update_section_numbers(self, node, prefix=(), depth=0):
depth += 1
if prefix:
sectnum = 1
else:
sectnum = self.startvalue
for child in node:
if isinstance(child, nodes.section):
numbers = prefix + (str(sectnum),)
title = child[0]
# Use for spacing:
generated = nodes.generated(
'', (self.prefix + '.'.join(numbers) + self.suffix
+ '\u00a0' * 3),
classes=['sectnum'])
title.insert(0, generated)
title['auto'] = 1
if depth < self.maxdepth:
self.update_section_numbers(child, numbers, depth)
sectnum += 1
class Contents(Transform):
"""
This transform generates a table of contents from the entire document tree
or from a single branch. It locates "section" elements and builds them
into a nested bullet list, which is placed within a "topic" created by the
contents directive. A title is either explicitly specified, taken from
the appropriate language module, or omitted (local table of contents).
The depth may be specified. Two-way references between the table of
contents and section titles are generated (requires Writer support).
This transform requires a startnode, which contains generation
options and provides the location for the generated table of contents (the
startnode is replaced by the table of contents "topic").
"""
default_priority = 720
def apply(self):
# let the writer (or output software) build the contents list?
toc_by_writer = getattr(self.document.settings, 'use_latex_toc', False)
details = self.startnode.details
if 'local' in details:
startnode = self.startnode.parent.parent
while not (isinstance(startnode, nodes.section)
or isinstance(startnode, nodes.document)):
# find the ToC root: a direct ancestor of startnode
startnode = startnode.parent
else:
startnode = self.document
self.toc_id = self.startnode.parent['ids'][0]
if 'backlinks' in details:
self.backlinks = details['backlinks']
else:
self.backlinks = self.document.settings.toc_backlinks
if toc_by_writer:
# move customization settings to the parent node
self.startnode.parent.attributes.update(details)
self.startnode.parent.remove(self.startnode)
else:
contents = self.build_contents(startnode)
if len(contents):
self.startnode.replace_self(contents)
else:
self.startnode.parent.parent.remove(self.startnode.parent)
def build_contents(self, node, level=0):
level += 1
sections = [sect for sect in node if isinstance(sect, nodes.section)]
entries = []
depth = self.startnode.details.get('depth', sys.maxsize)
for section in sections:
title = section[0]
auto = title.get('auto') # May be set by SectNum.
entrytext = self.copy_and_filter(title)
reference = nodes.reference('', '', refid=section['ids'][0],
*entrytext)
ref_id = self.document.set_id(reference,
suggested_prefix='toc-entry')
entry = nodes.paragraph('', '', reference)
item = nodes.list_item('', entry)
if (self.backlinks in ('entry', 'top')
and title.next_node(nodes.reference) is None):
if self.backlinks == 'entry':
title['refid'] = ref_id
elif self.backlinks == 'top':
title['refid'] = self.toc_id
if level < depth:
subsects = self.build_contents(section, level)
item += subsects
entries.append(item)
if entries:
contents = nodes.bullet_list('', *entries)
if auto: # auto-numbered sections
contents['classes'].append('auto-toc')
return contents
else:
return []
def copy_and_filter(self, node):
"""Return a copy of a title, with references, images, etc. removed."""
visitor = ContentsFilter(self.document)
node.walkabout(visitor)
return visitor.get_entry_text()
class ContentsFilter(nodes.TreeCopyVisitor):
def get_entry_text(self):
return self.get_tree_copy().children
def visit_citation_reference(self, node):
raise nodes.SkipNode
def visit_footnote_reference(self, node):
raise nodes.SkipNode
def visit_image(self, node):
if node.hasattr('alt'):
self.parent.append(nodes.Text(node['alt']))
raise nodes.SkipNode
def ignore_node_but_process_children(self, node):
raise nodes.SkipDeparture
visit_problematic = ignore_node_but_process_children
visit_reference = ignore_node_but_process_children
visit_target = ignore_node_but_process_children