locutus
Version:
Locutus other languages' standard libraries to JavaScript for fun and educational purposes
53 lines (52 loc) • 2.05 kB
JavaScript
import nodePath from 'path';
export function realpath(path) {
// discuss at: https://locutus.io/php/realpath/
// original by: mk.keck
// improved by: Kevin van Zonneveld (https://kvz.io)
// note 1: Returned path is an url like e.g. 'https://yourhost.tld/path/'
// example 1: realpath('some/dir/.././_supporters/pj_test_supportfile_1.htm')
// returns 1: 'some/_supporters/pj_test_supportfile_1.htm'
if (typeof window === 'undefined') {
return nodePath.normalize(path);
}
let hasProtocol = false;
let parts = []; // Save the root, if not given
const href = window.location.href; // Avoid input failures
// Check if there's a port in path (like 'https://')
let normalizedPath = String(path).replace('\\', '/');
if (normalizedPath.includes('://')) {
hasProtocol = true;
}
// Ok, there's not a port in path, so let's take the root
if (!hasProtocol) {
normalizedPath = href.substring(0, href.lastIndexOf('/') + 1) + normalizedPath;
}
// Explode the given path into it's parts
parts = normalizedPath.split('/'); // The path is an array now
const resolvedParts = []; // Foreach part make a check
for (const part of parts) {
// This is'nt really interesting
if (part === '.') {
continue;
}
// This reduces the realpath
if (part === '..') {
/* But only if there more than 3 parts in the path-array.
* The first three parts are for the uri */
if (resolvedParts.length > 3) {
resolvedParts.pop();
}
}
else {
// This adds parts to the realpath
// But only if the part is not empty or the uri
// (the first three parts ar needed) was not
// saved
if (resolvedParts.length < 2 || part !== '') {
resolvedParts.push(part);
}
}
}
// Returns the absloute path as a string
return resolvedParts.join('/');
}