105 lines
2.7 KiB
TypeScript
105 lines
2.7 KiB
TypeScript
import { extractFileNameFromUrl } from "./url";
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/**
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* Tests if an object or string is empty.
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*
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* @param {unknown} value The object or string.
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* @returns {boolean} If the object or string is empty.
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*/
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export const isEmpty = (value: unknown): boolean => {
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if (typeof value === "string") {
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return value.trim().length === 0;
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} else if (
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value instanceof File ||
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value instanceof Blob ||
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value instanceof Map ||
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value instanceof Set
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) {
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return value.size === 0;
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} else if (value instanceof FormData) {
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return [...value.entries()].length === 0;
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} else if (typeof value === "object") {
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return !value || Object.keys(value).length === 0;
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}
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return false;
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};
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/**
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* Returns the file extension
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*
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* @param {string} fileName The filename with extension.
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* @returns {string} The file extension.
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*/
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export const getFileExtension = (fileName: string): string => {
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if (fileName.includes(".")) {
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return fileName.split(".").pop();
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}
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return "";
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};
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/**
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* Returns a url to a file type icon based on file name.
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*
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* @param {string} fileName The filename with extension.
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* @returns {string} The url to the file type icon.
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*/
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export const getFileIconImagePath = (fileName: string): string => {
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const ext = getFileExtension(fileName);
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if (ext.length > 0) {
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return `/img/fileicons/${ext}.png`;
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}
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return "/img/fileicons/unknown.png";
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};
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/**
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* Returns a url to a file preview icon based on file url.
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*
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* @param {string} url The url of the file.
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* @returns {string} The url to the file preview icon.
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*/
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export const getFilePreview = (url: string): string => {
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const ext = getFileExtension(extractFileNameFromUrl(url));
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if (ext.length > 0) {
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if (/(gif|jpe?g|png)/i.test(ext)) {
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return `${url}?size=thumb`;
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}
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return `/img/fileicons/${ext}.png`;
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}
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return "/img/fileicons/unknown.png";
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};
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/**
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* Clamps a number between 2 numbers.
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*
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* @param {number} n The number to clamp.
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* @param {number} min The minimum allowable number.
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* @param {number} max The maximum allowable number.
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* @returns {number} The clamped number.
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*/
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export const clamp = (n: number, min: number, max: number): number => {
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if (n < min) return min;
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if (n > max) return max;
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return n;
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};
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/**
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* Generate a random element ID.
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*
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* @param {string} prefix Any prefix to add to the ID.
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* @returns {string} A random string non-existent in the document.
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*/
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export const generateRandomElementId = (prefix: string = ""): string => {
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let randomId = "";
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do {
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randomId = prefix + Math.random().toString(36).substring(2, 9);
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} while (document.getElementById(randomId));
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return randomId;
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};
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