181 lines
6.8 KiB
Python
181 lines
6.8 KiB
Python
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# $Id: parts.py 8403 2019-10-11 10:09:53Z milde $
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# Authors: David Goodger <goodger@python.org>; Ueli Schlaepfer; Dmitry Jemerov
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# Copyright: This module has been placed in the public domain.
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"""
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Transforms related to document parts.
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"""
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__docformat__ = 'reStructuredText'
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import re
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import sys
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from docutils import nodes, utils
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from docutils.transforms import TransformError, Transform
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class SectNum(Transform):
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"""
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Automatically assigns numbers to the titles of document sections.
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It is possible to limit the maximum section level for which the numbers
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are added. For those sections that are auto-numbered, the "autonum"
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attribute is set, informing the contents table generator that a different
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form of the TOC should be used.
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"""
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default_priority = 710
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"""Should be applied before `Contents`."""
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def apply(self):
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self.maxdepth = self.startnode.details.get('depth', None)
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self.startvalue = self.startnode.details.get('start', 1)
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self.prefix = self.startnode.details.get('prefix', '')
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self.suffix = self.startnode.details.get('suffix', '')
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self.startnode.parent.remove(self.startnode)
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if self.document.settings.sectnum_xform:
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if self.maxdepth is None:
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self.maxdepth = sys.maxsize
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self.update_section_numbers(self.document)
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else: # store details for eventual section numbering by the writer
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self.document.settings.sectnum_depth = self.maxdepth
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self.document.settings.sectnum_start = self.startvalue
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self.document.settings.sectnum_prefix = self.prefix
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self.document.settings.sectnum_suffix = self.suffix
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def update_section_numbers(self, node, prefix=(), depth=0):
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depth += 1
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if prefix:
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sectnum = 1
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else:
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sectnum = self.startvalue
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for child in node:
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if isinstance(child, nodes.section):
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numbers = prefix + (str(sectnum),)
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title = child[0]
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# Use for spacing:
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generated = nodes.generated(
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'', (self.prefix + '.'.join(numbers) + self.suffix
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+ u'\u00a0' * 3),
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classes=['sectnum'])
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title.insert(0, generated)
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title['auto'] = 1
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if depth < self.maxdepth:
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self.update_section_numbers(child, numbers, depth)
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sectnum += 1
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class Contents(Transform):
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"""
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This transform generates a table of contents from the entire document tree
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or from a single branch. It locates "section" elements and builds them
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into a nested bullet list, which is placed within a "topic" created by the
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contents directive. A title is either explicitly specified, taken from
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the appropriate language module, or omitted (local table of contents).
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The depth may be specified. Two-way references between the table of
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contents and section titles are generated (requires Writer support).
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This transform requires a startnode, which contains generation
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options and provides the location for the generated table of contents (the
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startnode is replaced by the table of contents "topic").
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"""
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default_priority = 720
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def apply(self):
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try: # let the writer (or output software) build the contents list?
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toc_by_writer = self.document.settings.use_latex_toc
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except AttributeError:
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toc_by_writer = False
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details = self.startnode.details
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if 'local' in details:
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startnode = self.startnode.parent.parent
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while not (isinstance(startnode, nodes.section)
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or isinstance(startnode, nodes.document)):
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# find the ToC root: a direct ancestor of startnode
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startnode = startnode.parent
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else:
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startnode = self.document
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self.toc_id = self.startnode.parent['ids'][0]
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if 'backlinks' in details:
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self.backlinks = details['backlinks']
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else:
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self.backlinks = self.document.settings.toc_backlinks
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if toc_by_writer:
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# move customization settings to the parent node
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self.startnode.parent.attributes.update(details)
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self.startnode.parent.remove(self.startnode)
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else:
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contents = self.build_contents(startnode)
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if len(contents):
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self.startnode.replace_self(contents)
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else:
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self.startnode.parent.parent.remove(self.startnode.parent)
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def build_contents(self, node, level=0):
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level += 1
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sections = [sect for sect in node if isinstance(sect, nodes.section)]
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entries = []
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autonum = 0
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depth = self.startnode.details.get('depth', sys.maxsize)
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for section in sections:
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title = section[0]
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auto = title.get('auto') # May be set by SectNum.
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entrytext = self.copy_and_filter(title)
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reference = nodes.reference('', '', refid=section['ids'][0],
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*entrytext)
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ref_id = self.document.set_id(reference,
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suggested_prefix='toc-entry')
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entry = nodes.paragraph('', '', reference)
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item = nodes.list_item('', entry)
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if ( self.backlinks in ('entry', 'top')
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and title.next_node(nodes.reference) is None):
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if self.backlinks == 'entry':
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title['refid'] = ref_id
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elif self.backlinks == 'top':
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title['refid'] = self.toc_id
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if level < depth:
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subsects = self.build_contents(section, level)
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item += subsects
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entries.append(item)
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if entries:
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contents = nodes.bullet_list('', *entries)
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if auto:
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contents['classes'].append('auto-toc')
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return contents
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else:
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return []
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def copy_and_filter(self, node):
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"""Return a copy of a title, with references, images, etc. removed."""
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visitor = ContentsFilter(self.document)
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node.walkabout(visitor)
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return visitor.get_entry_text()
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class ContentsFilter(nodes.TreeCopyVisitor):
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def get_entry_text(self):
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return self.get_tree_copy().children
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def visit_citation_reference(self, node):
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raise nodes.SkipNode
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def visit_footnote_reference(self, node):
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raise nodes.SkipNode
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def visit_image(self, node):
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if node.hasattr('alt'):
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self.parent.append(nodes.Text(node['alt']))
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raise nodes.SkipNode
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def ignore_node_but_process_children(self, node):
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raise nodes.SkipDeparture
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visit_problematic = ignore_node_but_process_children
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visit_reference = ignore_node_but_process_children
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visit_target = ignore_node_but_process_children
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