55 lines
1.3 KiB
TypeScript
55 lines
1.3 KiB
TypeScript
import { Comment, Node, Sorting } from '@app/common/types';
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import { LS_SORT_KEY, DEFAULT_SORT } from '@app/common/constants';
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import { getItem } from '@app/common/local-storage';
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/**
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* Filters tree node
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*/
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export function filterTree(tree: Node[], fn: (node: Node) => boolean): Node[] {
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let filtered = false;
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const newTree = tree.reduce<Node[]>((tree, node) => {
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if (!fn(node)) {
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filtered = true;
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return tree;
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}
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const newNode: Node = !node.replies ? node : { ...node, replies: filterTree(node.replies, fn) };
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if (newNode !== node) {
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filtered = true;
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}
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tree.push(newNode);
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return tree;
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}, []);
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if (!filtered) return tree;
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return newTree;
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}
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export function findPinnedComments(thread: Node): Comment[] {
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let result: Comment[] = [];
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if (thread.comment.pin) {
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result = result.concat(thread.comment);
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}
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if (thread.replies) {
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result = result.concat(
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thread.replies.reduce((acc: Comment[], thread: Node) => acc.concat(findPinnedComments(thread)), [])
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);
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}
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return result;
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}
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export function getPinnedComments(threads: Node[]): Comment[] {
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return threads.reduce((acc: Comment[], thread: Node) => acc.concat(findPinnedComments(thread)), []);
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}
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export function getInitialSort() {
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const sort = getItem(LS_SORT_KEY) as Sorting;
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if (sort) {
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return sort;
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}
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return DEFAULT_SORT;
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}
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