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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