Parse URI and Convert Relative URI to Absolute

parseuri_absuri.js

var parseURIMatcher = /^([^:\/?#]+:)?(\/\/(?:[^:@]*(?::[^:@]*)?@)?(([^:\/?#]*)(?::(\d*))?))?([^?#]*)(\?[^#]*)?(#[\s\S]*)?/;

/**
 * Parses the URI
 *
 * @param url
 * @returns object
 */
function parseURI(url) {
	var m = parseURIMatcher.exec(url);
	// authority = '//' + user + ':' + pass '@' + hostname + ':' port
	return (m ? {
		href     : m[0] || '',
		protocol : m[1] || '',
		authority: m[2] || '',
		host     : m[3] || '',
		hostname : m[4] || '',
		port     : m[5] || '',
		pathname : m[6] || '',
		search   : m[7] || '',
		hash     : m[8] || ''
	} : null);
}

/**
 * Absolutizes the path in `href` based on `base` url.
 *
 * @param base Base URI
 * @param href Path which to convert absolute
 *
 * @returns Absolute URI
 **/
function absolutizeURI(base, href) {// RFC 3986
	function removeDotSegments(input) {
		var output = [];
			input.replace(/^(\.\.?(\/|$))+/, '')
			.replace(/\/(\.(\/|$))+/g, '/')
			.replace(/\/\.\.$/, '/../')
			.replace(/\/?[^\/]*/g, function (p) {
				if (p === '/..') {
					output.pop();
				} else {
					output.push(p);
				}
			});
		return output.join('');
	}

	href = parseURI(String(href || '').replace(/^\s+|\s+$/g, ''));
	base = parseURI(String(base || '').replace(/^\s+|\s+$/g, ''));
	if (href === null || base === null) {
		return null;
	}
	var res = {};
	if (href.protocol || href.authority) {
		res.authority = href.authority;
		res.pathname  = removeDotSegments(href.pathname);
		res.search    = href.search;
	} else {
		if (!href.pathname) {
			res.pathname = base.pathname;
			res.search   = href.search || base.search;
		} else {
			if (href.pathname.charAt(0) === '/') {
				res.pathname = removeDotSegments(href.pathname);
			} else {
				if (base.authority && !base.pathname) {
					res.pathname = removeDotSegments('/' + href.pathname);
				} else {
					res.pathname = removeDotSegments(base.pathname.slice(0, base.pathname.lastIndexOf('/') + 1) + href.pathname);
				}
			}
			res.search = href.search;
		}
		res.authority = base.authority;
	}
	res.protocol = href.protocol || base.protocol;
	res.hash     = href.hash;
	return res.protocol + res.authority + res.pathname + res.search + res.hash;
}