Method insert

code3/bs4/element.py:298–362

(self, position, new_child)

    _lastRecursiveChild = _last_descendant

    def insert(self, position, new_child):
        if new_child is None:
            raise ValueError("Cannot insert None into a tag.")
        if new_child is self:
            raise ValueError("Cannot insert a tag into itself.")
        if (isinstance(new_child, str)
            and not isinstance(new_child, NavigableString)):
            new_child = NavigableString(new_child)

        position = min(position, len(self.contents))
        if hasattr(new_child, 'parent') and new_child.parent is not None:
            # We're 'inserting' an element that's already one
            # of this object's children.
            if new_child.parent is self:
                current_index = self.index(new_child)
                if current_index < position:
                    # We're moving this element further down the list
                    # of this object's children. That means that when
                    # we extract this element, our target index will
                    # jump down one.
                    position -= 1
            new_child.extract()

        new_child.parent = self
        previous_child = None
        if position == 0:
            new_child.previous_sibling = None
            new_child.previous_element = self
        else:
            previous_child = self.contents[position - 1]
            new_child.previous_sibling = previous_child
            new_child.previous_sibling.next_sibling = new_child
            new_child.previous_element = previous_child._last_descendant(False)
        if new_child.previous_element is not None:
            new_child.previous_element.next_element = new_child

        new_childs_last_element = new_child._last_descendant(False)

        if position >= len(self.contents):
            new_child.next_sibling = None

            parent = self
            parents_next_sibling = None
            while parents_next_sibling is None and parent is not None:
                parents_next_sibling = parent.next_sibling
                parent = parent.parent
                if parents_next_sibling is not None:
                    # We found the element that comes next in the document.
                    break
            if parents_next_sibling is not None:
                new_childs_last_element.next_element = parents_next_sibling
            else:
                # The last element of this tag is the last element in
                # the document.
                new_childs_last_element.next_element = None
        else:
            next_child = self.contents[position]
            new_child.next_sibling = next_child