Commit With Frontend and Backend in MERN

backend/node_modules/mongodb/src/sort.ts

@@ -0,0 +1,132 @@
+import { MongoInvalidArgumentError } from './error';
+
+/** @public */
+export type SortDirection =
+  | 1
+  | -1
+  | 'asc'
+  | 'desc'
+  | 'ascending'
+  | 'descending'
+  | { $meta: string };
+
+/** @public */
+export type Sort =
+  | string
+  | Exclude<SortDirection, { $meta: string }>
+  | string[]
+  | { [key: string]: SortDirection }
+  | Map<string, SortDirection>
+  | [string, SortDirection][]
+  | [string, SortDirection];
+
+/** Below stricter types were created for sort that correspond with type that the cmd takes  */
+
+/** @internal */
+export type SortDirectionForCmd = 1 | -1 | { $meta: string };
+
+/** @internal */
+export type SortForCmd = Map<string, SortDirectionForCmd>;
+
+/** @internal */
+type SortPairForCmd = [string, SortDirectionForCmd];
+
+/** @internal */
+function prepareDirection(direction: any = 1): SortDirectionForCmd {
+  const value = `${direction}`.toLowerCase();
+  if (isMeta(direction)) return direction;
+  switch (value) {
+    case 'ascending':
+    case 'asc':
+    case '1':
+      return 1;
+    case 'descending':
+    case 'desc':
+    case '-1':
+      return -1;
+    default:
+      throw new MongoInvalidArgumentError(`Invalid sort direction: ${JSON.stringify(direction)}`);
+  }
+}
+
+/** @internal */
+function isMeta(t: SortDirection): t is { $meta: string } {
+  return typeof t === 'object' && t != null && '$meta' in t && typeof t.$meta === 'string';
+}
+
+/** @internal */
+function isPair(t: Sort): t is [string, SortDirection] {
+  if (Array.isArray(t) && t.length === 2) {
+    try {
+      prepareDirection(t[1]);
+      return true;
+    } catch {
+      return false;
+    }
+  }
+  return false;
+}
+
+function isDeep(t: Sort): t is [string, SortDirection][] {
+  return Array.isArray(t) && Array.isArray(t[0]);
+}
+
+function isMap(t: Sort): t is Map<string, SortDirection> {
+  return t instanceof Map && t.size > 0;
+}
+
+/** @internal */
+function pairToMap(v: [string, SortDirection]): SortForCmd {
+  return new Map([[`${v[0]}`, prepareDirection([v[1]])]]);
+}
+
+/** @internal */
+function deepToMap(t: [string, SortDirection][]): SortForCmd {
+  const sortEntries: SortPairForCmd[] = t.map(([k, v]) => [`${k}`, prepareDirection(v)]);
+  return new Map(sortEntries);
+}
+
+/** @internal */
+function stringsToMap(t: string[]): SortForCmd {
+  const sortEntries: SortPairForCmd[] = t.map(key => [`${key}`, 1]);
+  return new Map(sortEntries);
+}
+
+/** @internal */
+function objectToMap(t: { [key: string]: SortDirection }): SortForCmd {
+  const sortEntries: SortPairForCmd[] = Object.entries(t).map(([k, v]) => [
+    `${k}`,
+    prepareDirection(v)
+  ]);
+  return new Map(sortEntries);
+}
+
+/** @internal */
+function mapToMap(t: Map<string, SortDirection>): SortForCmd {
+  const sortEntries: SortPairForCmd[] = Array.from(t).map(([k, v]) => [
+    `${k}`,
+    prepareDirection(v)
+  ]);
+  return new Map(sortEntries);
+}
+
+/** converts a Sort type into a type that is valid for the server (SortForCmd) */
+export function formatSort(
+  sort: Sort | undefined,
+  direction?: SortDirection
+): SortForCmd | undefined {
+  if (sort == null) return undefined;
+  if (typeof sort === 'string') return new Map([[sort, prepareDirection(direction)]]);
+  if (typeof sort !== 'object') {
+    throw new MongoInvalidArgumentError(
+      `Invalid sort format: ${JSON.stringify(sort)} Sort must be a valid object`
+    );
+  }
+  if (!Array.isArray(sort)) {
+    return isMap(sort) ? mapToMap(sort) : Object.keys(sort).length ? objectToMap(sort) : undefined;
+  }
+  if (!sort.length) return undefined;
+  if (isDeep(sort)) return deepToMap(sort);
+  if (isPair(sort)) return pairToMap(sort);
+  return stringsToMap(sort);
+}