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# $Id: misc.py 10166 2025-06-16 09:45:10Z milde $ # Author: David Goodger <goodger@python.org> # Copyright: This module has been placed in the public domain. """ Miscellaneous transforms. """ from __future__ import annotations __docformat__ = 'reStructuredText' from docutils import nodes from docutils.transforms import Transform class CallBack(Transform): """ Inserts a callback into a document. The callback is called when the transform is applied, which is determined by its priority. For use with `nodes.pending` elements. Requires a ``details['callback']`` entry, a bound method or function which takes one parameter: the pending node. Other data can be stored in the ``details`` attribute or in the object hosting the callback method. """ default_priority = 990 def apply(self) -> None: pending = self.startnode pending.details['callback'](pending) pending.parent.remove(pending) class ClassAttribute(Transform): """ Move the "class" attribute specified in the "pending" node into the next visible element. """ default_priority = 210 def apply(self) -> None: pending = self.startnode parent = pending.parent child = pending while parent: # Check for appropriate following siblings: for index in range(parent.index(child) + 1, len(parent)): element = parent[index] if (isinstance(element, nodes.Invisible) or isinstance(element, nodes.system_message)): continue element['classes'] += pending.details['class'] pending.parent.remove(pending) return else: # At end of section or container; apply to sibling child = parent parent = parent.parent error = self.document.reporter.error( 'No suitable element following "%s" directive' % pending.details['directive'], nodes.literal_block(pending.rawsource, pending.rawsource), line=pending.line) pending.replace_self(error) class Transitions(Transform): """ Move transitions at the end of sections up the tree. Complain on transitions after a title, subtitle, meta, or decoration element, at the beginning or end of the document, and after another transition. For example, transform this:: <section> ... <transition> <section> ... into this:: <section> ... <transition> <section> ... """ default_priority = 830 def apply(self) -> None: for node in self.document.findall(nodes.transition): self.visit_transition(node) def visit_transition(self, node) -> None: index = node.parent.index(node) previous_sibling = node.previous_sibling() msg = '' if not isinstance(node.parent, (nodes.document, nodes.section)): msg = 'Transition must be child of <document> or <section>.' elif index == 0 or isinstance(previous_sibling, (nodes.title, nodes.subtitle, nodes.meta, nodes.decoration)): msg = 'Document or section may not begin with a transition.' elif isinstance(previous_sibling, nodes.transition): msg = ('At least one body element must separate transitions; ' 'adjacent transitions are not allowed.') if msg: warning = self.document.reporter.warning(msg, base_node=node) # Check, if it is valid to insert a body element node.parent[index] = nodes.paragraph() try: node.parent.validate(recursive=False) except nodes.ValidationError: node.parent[index] = node else: node.parent[index] = node node.parent.insert(index+1, warning) index += 1 if not isinstance(node.parent, (nodes.document, nodes.section)): return assert index < len(node.parent) if index != len(node.parent) - 1: # No need to move the node. return # Node behind which the transition is to be moved. sibling = node # While sibling is the last node of its parent. while index == len(sibling.parent) - 1: sibling = sibling.parent if sibling.parent is None: # sibling is the top node (document) # Transition at the end of document. Do not move the # transition up, and place a warning behind. warning = self.document.reporter.warning( 'Document may not end with a transition.', base_node=node) node.parent.append(warning) return index = sibling.parent.index(sibling) # Remove the original transition node. node.parent.remove(node) # Insert the transition after the sibling. sibling.parent.insert(index + 1, node)