environment.py 文件源码

def _toctree_prune(self, node, depth, maxdepth, collapse=False):
        """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)