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