531 lines
17 KiB
TypeScript
531 lines
17 KiB
TypeScript
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/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*/
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import {$getNearestNodeOfType} from '@lexical/utils';
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import {
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$createParagraphNode,
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$getSelection,
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$isElementNode,
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$isLeafNode,
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$isParagraphNode,
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$isRangeSelection,
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$isRootOrShadowRoot,
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ElementNode,
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LexicalEditor,
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LexicalNode,
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NodeKey,
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ParagraphNode,
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} from 'lexical';
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import invariant from 'lexical/shared/invariant';
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import {
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$createListItemNode,
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$createListNode,
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$isListItemNode,
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$isListNode,
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ListItemNode,
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ListNode,
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} from './';
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import {ListType} from './LexicalListNode';
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import {
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$getAllListItems,
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$getTopListNode,
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$removeHighestEmptyListParent,
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isNestedListNode,
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} from './utils';
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function $isSelectingEmptyListItem(
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anchorNode: ListItemNode | LexicalNode,
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nodes: Array<LexicalNode>,
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): boolean {
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return (
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$isListItemNode(anchorNode) &&
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(nodes.length === 0 ||
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(nodes.length === 1 &&
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anchorNode.is(nodes[0]) &&
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anchorNode.getChildrenSize() === 0))
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);
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}
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/**
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* Inserts a new ListNode. If the selection's anchor node is an empty ListItemNode and is a child of
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* the root/shadow root, it will replace the ListItemNode with a ListNode and the old ListItemNode.
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* Otherwise it will replace its parent with a new ListNode and re-insert the ListItemNode and any previous children.
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* If the selection's anchor node is not an empty ListItemNode, it will add a new ListNode or merge an existing ListNode,
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* unless the the node is a leaf node, in which case it will attempt to find a ListNode up the branch and replace it with
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* a new ListNode, or create a new ListNode at the nearest root/shadow root.
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* @param editor - The lexical editor.
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* @param listType - The type of list, "number" | "bullet" | "check".
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*/
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export function insertList(editor: LexicalEditor, listType: ListType): void {
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editor.update(() => {
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const selection = $getSelection();
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if (selection !== null) {
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const nodes = selection.getNodes();
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if ($isRangeSelection(selection)) {
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const anchorAndFocus = selection.getStartEndPoints();
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invariant(
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anchorAndFocus !== null,
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'insertList: anchor should be defined',
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);
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const [anchor] = anchorAndFocus;
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const anchorNode = anchor.getNode();
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const anchorNodeParent = anchorNode.getParent();
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if ($isSelectingEmptyListItem(anchorNode, nodes)) {
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const list = $createListNode(listType);
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if ($isRootOrShadowRoot(anchorNodeParent)) {
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anchorNode.replace(list);
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const listItem = $createListItemNode();
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if ($isElementNode(anchorNode)) {
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listItem.setFormat(anchorNode.getFormatType());
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listItem.setIndent(anchorNode.getIndent());
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}
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list.append(listItem);
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} else if ($isListItemNode(anchorNode)) {
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const parent = anchorNode.getParentOrThrow();
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append(list, parent.getChildren());
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parent.replace(list);
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}
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return;
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}
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}
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const handled = new Set();
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for (let i = 0; i < nodes.length; i++) {
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const node = nodes[i];
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if (
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$isElementNode(node) &&
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node.isEmpty() &&
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!$isListItemNode(node) &&
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!handled.has(node.getKey())
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) {
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$createListOrMerge(node, listType);
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continue;
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}
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if ($isLeafNode(node)) {
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let parent = node.getParent();
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while (parent != null) {
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const parentKey = parent.getKey();
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if ($isListNode(parent)) {
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if (!handled.has(parentKey)) {
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const newListNode = $createListNode(listType);
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append(newListNode, parent.getChildren());
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parent.replace(newListNode);
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handled.add(parentKey);
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}
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break;
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} else {
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const nextParent = parent.getParent();
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if ($isRootOrShadowRoot(nextParent) && !handled.has(parentKey)) {
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handled.add(parentKey);
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$createListOrMerge(parent, listType);
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break;
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}
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parent = nextParent;
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}
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}
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}
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}
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}
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});
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}
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function append(node: ElementNode, nodesToAppend: Array<LexicalNode>) {
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node.splice(node.getChildrenSize(), 0, nodesToAppend);
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}
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function $createListOrMerge(node: ElementNode, listType: ListType): ListNode {
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if ($isListNode(node)) {
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return node;
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}
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const previousSibling = node.getPreviousSibling();
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const nextSibling = node.getNextSibling();
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const listItem = $createListItemNode();
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listItem.setFormat(node.getFormatType());
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listItem.setIndent(node.getIndent());
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append(listItem, node.getChildren());
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if (
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$isListNode(previousSibling) &&
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listType === previousSibling.getListType()
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) {
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previousSibling.append(listItem);
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node.remove();
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// if the same type of list is on both sides, merge them.
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if ($isListNode(nextSibling) && listType === nextSibling.getListType()) {
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append(previousSibling, nextSibling.getChildren());
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nextSibling.remove();
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}
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return previousSibling;
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} else if (
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$isListNode(nextSibling) &&
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listType === nextSibling.getListType()
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) {
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nextSibling.getFirstChildOrThrow().insertBefore(listItem);
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node.remove();
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return nextSibling;
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} else {
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const list = $createListNode(listType);
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list.append(listItem);
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node.replace(list);
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return list;
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}
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}
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/**
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* A recursive function that goes through each list and their children, including nested lists,
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* appending list2 children after list1 children and updating ListItemNode values.
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* @param list1 - The first list to be merged.
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* @param list2 - The second list to be merged.
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*/
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export function mergeLists(list1: ListNode, list2: ListNode): void {
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const listItem1 = list1.getLastChild();
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const listItem2 = list2.getFirstChild();
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if (
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listItem1 &&
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listItem2 &&
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isNestedListNode(listItem1) &&
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isNestedListNode(listItem2)
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) {
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mergeLists(listItem1.getFirstChild(), listItem2.getFirstChild());
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listItem2.remove();
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}
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const toMerge = list2.getChildren();
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if (toMerge.length > 0) {
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list1.append(...toMerge);
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}
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list2.remove();
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}
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/**
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* Searches for the nearest ancestral ListNode and removes it. If selection is an empty ListItemNode
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* it will remove the whole list, including the ListItemNode. For each ListItemNode in the ListNode,
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* removeList will also generate new ParagraphNodes in the removed ListNode's place. Any child node
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* inside a ListItemNode will be appended to the new ParagraphNodes.
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* @param editor - The lexical editor.
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*/
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export function removeList(editor: LexicalEditor): void {
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editor.update(() => {
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const selection = $getSelection();
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if ($isRangeSelection(selection)) {
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const listNodes = new Set<ListNode>();
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const nodes = selection.getNodes();
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const anchorNode = selection.anchor.getNode();
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if ($isSelectingEmptyListItem(anchorNode, nodes)) {
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listNodes.add($getTopListNode(anchorNode));
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} else {
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for (let i = 0; i < nodes.length; i++) {
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const node = nodes[i];
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if ($isLeafNode(node)) {
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const listItemNode = $getNearestNodeOfType(node, ListItemNode);
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if (listItemNode != null) {
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listNodes.add($getTopListNode(listItemNode));
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}
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}
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}
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}
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for (const listNode of listNodes) {
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let insertionPoint: ListNode | ParagraphNode = listNode;
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const listItems = $getAllListItems(listNode);
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for (const listItemNode of listItems) {
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const paragraph = $createParagraphNode();
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append(paragraph, listItemNode.getChildren());
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insertionPoint.insertAfter(paragraph);
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insertionPoint = paragraph;
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// When the anchor and focus fall on the textNode
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// we don't have to change the selection because the textNode will be appended to
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// the newly generated paragraph.
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// When selection is in empty nested list item, selection is actually on the listItemNode.
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// When the corresponding listItemNode is deleted and replaced by the newly generated paragraph
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// we should manually set the selection's focus and anchor to the newly generated paragraph.
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if (listItemNode.__key === selection.anchor.key) {
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selection.anchor.set(paragraph.getKey(), 0, 'element');
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}
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if (listItemNode.__key === selection.focus.key) {
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selection.focus.set(paragraph.getKey(), 0, 'element');
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}
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listItemNode.remove();
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}
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listNode.remove();
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}
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}
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});
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}
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/**
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* Takes the value of a child ListItemNode and makes it the value the ListItemNode
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* should be if it isn't already. Also ensures that checked is undefined if the
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* parent does not have a list type of 'check'.
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* @param list - The list whose children are updated.
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*/
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export function updateChildrenListItemValue(list: ListNode): void {
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const isNotChecklist = list.getListType() !== 'check';
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let value = list.getStart();
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for (const child of list.getChildren()) {
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if ($isListItemNode(child)) {
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if (child.getValue() !== value) {
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child.setValue(value);
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}
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if (isNotChecklist && child.getLatest().__checked != null) {
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child.setChecked(undefined);
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}
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if (!$isListNode(child.getFirstChild())) {
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value++;
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}
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}
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}
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}
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/**
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* Merge the next sibling list if same type.
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* <ul> will merge with <ul>, but NOT <ul> with <ol>.
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* @param list - The list whose next sibling should be potentially merged
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*/
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export function mergeNextSiblingListIfSameType(list: ListNode): void {
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const nextSibling = list.getNextSibling();
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if (
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$isListNode(nextSibling) &&
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list.getListType() === nextSibling.getListType()
|
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) {
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mergeLists(list, nextSibling);
|
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}
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}
|
||
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/**
|
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|
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* Adds an empty ListNode/ListItemNode chain at listItemNode, so as to
|
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|
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* create an indent effect. Won't indent ListItemNodes that have a ListNode as
|
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* a child, but does merge sibling ListItemNodes if one has a nested ListNode.
|
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|
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* @param listItemNode - The ListItemNode to be indented.
|
||
|
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*/
|
||
|
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export function $handleIndent(listItemNode: ListItemNode): void {
|
||
|
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// go through each node and decide where to move it.
|
||
|
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const removed = new Set<NodeKey>();
|
||
|
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|
||
|
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if (isNestedListNode(listItemNode) || removed.has(listItemNode.getKey())) {
|
||
|
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return;
|
||
|
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}
|
||
|
|
|
||
|
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const parent = listItemNode.getParent();
|
||
|
|
|
||
|
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// We can cast both of the below `isNestedListNode` only returns a boolean type instead of a user-defined type guards
|
||
|
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const nextSibling =
|
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|
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listItemNode.getNextSibling<ListItemNode>() as ListItemNode;
|
||
|
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const previousSibling =
|
||
|
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listItemNode.getPreviousSibling<ListItemNode>() as ListItemNode;
|
||
|
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// if there are nested lists on either side, merge them all together.
|
||
|
|
|
||
|
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if (isNestedListNode(nextSibling) && isNestedListNode(previousSibling)) {
|
||
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const innerList = previousSibling.getFirstChild();
|
||
|
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|
||
|
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if ($isListNode(innerList)) {
|
||
|
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innerList.append(listItemNode);
|
||
|
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const nextInnerList = nextSibling.getFirstChild();
|
||
|
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|
||
|
|
if ($isListNode(nextInnerList)) {
|
||
|
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const children = nextInnerList.getChildren();
|
||
|
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append(innerList, children);
|
||
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nextSibling.remove();
|
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removed.add(nextSibling.getKey());
|
||
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}
|
||
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}
|
||
|
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} else if (isNestedListNode(nextSibling)) {
|
||
|
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// if the ListItemNode is next to a nested ListNode, merge them
|
||
|
|
const innerList = nextSibling.getFirstChild();
|
||
|
|
|
||
|
|
if ($isListNode(innerList)) {
|
||
|
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const firstChild = innerList.getFirstChild();
|
||
|
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|
||
|
|
if (firstChild !== null) {
|
||
|
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firstChild.insertBefore(listItemNode);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else if (isNestedListNode(previousSibling)) {
|
||
|
|
const innerList = previousSibling.getFirstChild();
|
||
|
|
|
||
|
|
if ($isListNode(innerList)) {
|
||
|
|
innerList.append(listItemNode);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// otherwise, we need to create a new nested ListNode
|
||
|
|
|
||
|
|
if ($isListNode(parent)) {
|
||
|
|
const newListItem = $createListItemNode();
|
||
|
|
const newList = $createListNode(parent.getListType());
|
||
|
|
newListItem.append(newList);
|
||
|
|
newList.append(listItemNode);
|
||
|
|
|
||
|
|
if (previousSibling) {
|
||
|
|
previousSibling.insertAfter(newListItem);
|
||
|
|
} else if (nextSibling) {
|
||
|
|
nextSibling.insertBefore(newListItem);
|
||
|
|
} else {
|
||
|
|
parent.append(newListItem);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Removes an indent by removing an empty ListNode/ListItemNode chain. An indented ListItemNode
|
||
|
|
* has a great grandparent node of type ListNode, which is where the ListItemNode will reside
|
||
|
|
* within as a child.
|
||
|
|
* @param listItemNode - The ListItemNode to remove the indent (outdent).
|
||
|
|
*/
|
||
|
|
export function $handleOutdent(listItemNode: ListItemNode): void {
|
||
|
|
// go through each node and decide where to move it.
|
||
|
|
|
||
|
|
if (isNestedListNode(listItemNode)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
const parentList = listItemNode.getParent();
|
||
|
|
const grandparentListItem = parentList ? parentList.getParent() : undefined;
|
||
|
|
const greatGrandparentList = grandparentListItem
|
||
|
|
? grandparentListItem.getParent()
|
||
|
|
: undefined;
|
||
|
|
// If it doesn't have these ancestors, it's not indented.
|
||
|
|
|
||
|
|
if (
|
||
|
|
$isListNode(greatGrandparentList) &&
|
||
|
|
$isListItemNode(grandparentListItem) &&
|
||
|
|
$isListNode(parentList)
|
||
|
|
) {
|
||
|
|
// if it's the first child in it's parent list, insert it into the
|
||
|
|
// great grandparent list before the grandparent
|
||
|
|
const firstChild = parentList ? parentList.getFirstChild() : undefined;
|
||
|
|
const lastChild = parentList ? parentList.getLastChild() : undefined;
|
||
|
|
|
||
|
|
if (listItemNode.is(firstChild)) {
|
||
|
|
grandparentListItem.insertBefore(listItemNode);
|
||
|
|
|
||
|
|
if (parentList.isEmpty()) {
|
||
|
|
grandparentListItem.remove();
|
||
|
|
}
|
||
|
|
// if it's the last child in it's parent list, insert it into the
|
||
|
|
// great grandparent list after the grandparent.
|
||
|
|
} else if (listItemNode.is(lastChild)) {
|
||
|
|
grandparentListItem.insertAfter(listItemNode);
|
||
|
|
|
||
|
|
if (parentList.isEmpty()) {
|
||
|
|
grandparentListItem.remove();
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// otherwise, we need to split the siblings into two new nested lists
|
||
|
|
const listType = parentList.getListType();
|
||
|
|
const previousSiblingsListItem = $createListItemNode();
|
||
|
|
const previousSiblingsList = $createListNode(listType);
|
||
|
|
previousSiblingsListItem.append(previousSiblingsList);
|
||
|
|
listItemNode
|
||
|
|
.getPreviousSiblings()
|
||
|
|
.forEach((sibling) => previousSiblingsList.append(sibling));
|
||
|
|
const nextSiblingsListItem = $createListItemNode();
|
||
|
|
const nextSiblingsList = $createListNode(listType);
|
||
|
|
nextSiblingsListItem.append(nextSiblingsList);
|
||
|
|
append(nextSiblingsList, listItemNode.getNextSiblings());
|
||
|
|
// put the sibling nested lists on either side of the grandparent list item in the great grandparent.
|
||
|
|
grandparentListItem.insertBefore(previousSiblingsListItem);
|
||
|
|
grandparentListItem.insertAfter(nextSiblingsListItem);
|
||
|
|
// replace the grandparent list item (now between the siblings) with the outdented list item.
|
||
|
|
grandparentListItem.replace(listItemNode);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Attempts to insert a ParagraphNode at selection and selects the new node. The selection must contain a ListItemNode
|
||
|
|
* or a node that does not already contain text. If its grandparent is the root/shadow root, it will get the ListNode
|
||
|
|
* (which should be the parent node) and insert the ParagraphNode as a sibling to the ListNode. If the ListNode is
|
||
|
|
* nested in a ListItemNode instead, it will add the ParagraphNode after the grandparent ListItemNode.
|
||
|
|
* Throws an invariant if the selection is not a child of a ListNode.
|
||
|
|
* @returns true if a ParagraphNode was inserted succesfully, false if there is no selection
|
||
|
|
* or the selection does not contain a ListItemNode or the node already holds text.
|
||
|
|
*/
|
||
|
|
export function $handleListInsertParagraph(): boolean {
|
||
|
|
const selection = $getSelection();
|
||
|
|
|
||
|
|
if (!$isRangeSelection(selection) || !selection.isCollapsed()) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
// Only run this code on empty list items
|
||
|
|
const anchor = selection.anchor.getNode();
|
||
|
|
|
||
|
|
if (!$isListItemNode(anchor) || anchor.getChildrenSize() !== 0) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
const topListNode = $getTopListNode(anchor);
|
||
|
|
const parent = anchor.getParent();
|
||
|
|
|
||
|
|
invariant(
|
||
|
|
$isListNode(parent),
|
||
|
|
'A ListItemNode must have a ListNode for a parent.',
|
||
|
|
);
|
||
|
|
|
||
|
|
const grandparent = parent.getParent();
|
||
|
|
|
||
|
|
let replacementNode;
|
||
|
|
|
||
|
|
if ($isRootOrShadowRoot(grandparent)) {
|
||
|
|
replacementNode = $createParagraphNode();
|
||
|
|
topListNode.insertAfter(replacementNode);
|
||
|
|
} else if ($isListItemNode(grandparent)) {
|
||
|
|
replacementNode = $createListItemNode();
|
||
|
|
grandparent.insertAfter(replacementNode);
|
||
|
|
} else {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
replacementNode.select();
|
||
|
|
|
||
|
|
const nextSiblings = anchor.getNextSiblings();
|
||
|
|
|
||
|
|
if (nextSiblings.length > 0) {
|
||
|
|
const newList = $createListNode(parent.getListType());
|
||
|
|
|
||
|
|
if ($isParagraphNode(replacementNode)) {
|
||
|
|
replacementNode.insertAfter(newList);
|
||
|
|
} else {
|
||
|
|
const newListItem = $createListItemNode();
|
||
|
|
newListItem.append(newList);
|
||
|
|
replacementNode.insertAfter(newListItem);
|
||
|
|
}
|
||
|
|
nextSiblings.forEach((sibling) => {
|
||
|
|
sibling.remove();
|
||
|
|
newList.append(sibling);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Don't leave hanging nested empty lists
|
||
|
|
$removeHighestEmptyListParent(anchor);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|