url.js
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url.js
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	import { test, testThrows, testDeep, summary } from './helpers.js';

	console.log('URL constructor\n');

	const url = new URL('https://user:pass@example.com:8080/path/to?query=value#hash');
	test('full URL href', url.href, 'https://user:pass@example.com:8080/path/to?query=value#hash');

	const url2 = new URL('/other', 'https://example.com');
	test('URL with base', url2.href, 'https://example.com/other');

	const url2b = new URL('foo', 'https://example.com/bar/baz');
	test('URL with base resolves relative', url2b.href, 'https://example.com/bar/foo');

	const url2c = new URL('//other.com/path', 'https://example.com');
	test('URL with base protocol-relative', url2c.href, 'https://other.com/path');

	testThrows('requires new', () => URL());
	testThrows('invalid URL throws TypeError', () => new URL('not a url'));
	testThrows('invalid URL with base throws', () => new URL('http://%', 'https://example.com'));

	test('toString() returns href', url.toString(), url.href);
	test('toJSON() returns href', url.toJSON(), url.href);

	test('URL.canParse valid', URL.canParse('https://example.com'), true);
	test('URL.canParse invalid', URL.canParse('not a url'), false);
	test('URL.canParse with base', URL.canParse('/path', 'https://example.com'), true);

	const parsed = URL.parse('https://example.com/test');
	test('URL.parse valid returns URL', parsed instanceof URL, true);
	test('URL.parse valid href', parsed.href, 'https://example.com/test');
	test('URL.parse invalid returns null', URL.parse('not a url'), null);

	const parsedBase = URL.parse('/path', 'https://example.com');
	test('URL.parse with base', parsedBase.href, 'https://example.com/path');

	console.log('\nURL properties (getters)\n');

	test('protocol', url.protocol, 'https:');
	test('username', url.username, 'user');
	test('password', url.password, 'pass');
	test('hostname', url.hostname, 'example.com');
	test('host (hostname:port)', url.host, 'example.com:8080');
	test('port', url.port, '8080');
	test('pathname', url.pathname, '/path/to');
	test('search', url.search, '?query=value');
	test('hash', url.hash, '#hash');
	test('origin', url.origin, 'https://example.com:8080');

	const urlNoSearch = new URL('https://example.com/path');
	test('search empty string when absent', urlNoSearch.search, '');

	const urlNoHash = new URL('https://example.com/path');
	test('hash empty string when absent', urlNoHash.hash, '');

	const urlDefaultHost = new URL('https://example.com/');
	test('host without port', urlDefaultHost.host, 'example.com');

	const urlNoUser = new URL('https://example.com/');
	test('username empty when absent', urlNoUser.username, '');
	test('password empty when absent', urlNoUser.password, '');

	console.log('\nURL property setters\n');

	const us1 = new URL('https://example.com/old');
	us1.href = 'https://other.com/new?q=1';
	test('set href reparses', us1.hostname, 'other.com');
	test('set href pathname', us1.pathname, '/new');
	test('set href search', us1.search, '?q=1');

	const us2 = new URL('https://example.com/path');
	us2.protocol = 'http:';
	test('set protocol', us2.protocol, 'http:');

	const us3 = new URL('https://example.com/path');
	us3.hostname = 'other.com';
	test('set hostname', us3.hostname, 'other.com');
	test('set hostname updates host', us3.host, 'other.com');

	const us4 = new URL('https://example.com/path');
	us4.port = '9090';
	test('set port', us4.port, '9090');
	test('set port updates host', us4.host, 'example.com:9090');

	const us4b = new URL('https://example.com:9090/path');
	us4b.port = '443';
	test('set default port elides', us4b.port, '');

	const us5 = new URL('https://example.com/old');
	us5.pathname = '/new/path';
	test('set pathname', us5.pathname, '/new/path');

	const us6 = new URL('https://example.com/path');
	us6.search = '?x=1&y=2';
	test('set search', us6.search, '?x=1&y=2');

	const us6b = new URL('https://example.com/path?old=1');
	us6b.search = '';
	test('set search empty clears', us6b.search, '');

	const us7 = new URL('https://example.com/path');
	us7.hash = '#section';
	test('set hash', us7.hash, '#section');

	const us7b = new URL('https://example.com/path#old');
	us7b.hash = '';
	test('set hash empty clears', us7b.hash, '');

	const us8 = new URL('https://example.com/path');
	us8.username = 'alice';
	test('set username', us8.username, 'alice');

	const us9 = new URL('https://example.com/path');
	us9.password = 'secret';
	test('set password', us9.password, 'secret');

	console.log('\ndefault port handling\n');

	const httpDefault = new URL('http://example.com:80/');
	test('http port 80 elided', httpDefault.port, '');
	test('http port 80 host omits port', httpDefault.host, 'example.com');

	const httpsDefault = new URL('https://example.com:443/');
	test('https port 443 elided', httpsDefault.port, '');
	test('https port 443 host omits port', httpsDefault.host, 'example.com');

	const httpNonDefault = new URL('http://example.com:3000/');
	test('http non-default port shown', httpNonDefault.port, '3000');
	test('http non-default host includes port', httpNonDefault.host, 'example.com:3000');

	const httpsNonDefault = new URL('https://example.com:8443/');
	test('https non-default port shown', httpsNonDefault.port, '8443');

	console.log('\nURLSearchParams constructor\n');

	const sp0 = new URLSearchParams();
	test('empty constructor toString', sp0.toString(), '');
	test('empty constructor size', sp0.size, 0);

	const sp1 = new URLSearchParams('a=1&b=2');
	test('from string get a', sp1.get('a'), '1');
	test('from string get b', sp1.get('b'), '2');
	test('from string size', sp1.size, 2);

	const sp1b = new URLSearchParams('?a=1&b=2');
	test('from string with leading ?', sp1b.get('a'), '1');
	test('from string with leading ? get b', sp1b.get('b'), '2');

	const sp2 = new URLSearchParams([
	['a', '1'],
	['b', '2']
	]);
	test('from array get a', sp2.get('a'), '1');
	test('from array get b', sp2.get('b'), '2');
	test('from array size', sp2.size, 2);

	const sp3 = new URLSearchParams({ a: '1', b: '2' });
	test('from object get a', sp3.get('a'), '1');
	test('from object get b', sp3.get('b'), '2');

	const sp4 = new URLSearchParams(new URLSearchParams('x=9&y=8'));
	test('from another URLSearchParams get x', sp4.get('x'), '9');
	test('from another URLSearchParams get y', sp4.get('y'), '8');

	testThrows('pair with 1 element throws', () => new URLSearchParams([['only_key']]));
	testThrows('pair with 3 elements throws', () => new URLSearchParams([['a', 'b', 'c']]));

	console.log('\nURLSearchParams methods\n');

	const sp = new URLSearchParams('a=1&b=2&a=3');

	test('get returns first value', sp.get('a'), '1');
	test('get missing returns null', sp.get('z'), null);

	testDeep('getAll returns all values', sp.getAll('a'), ['1', '3']);
	testDeep('getAll missing returns empty', sp.getAll('z'), []);

	test('has returns true', sp.has('a'), true);
	test('has missing returns false', sp.has('z'), false);

	test('has with matching value', sp.has('a', '1'), true);
	test('has with non-matching value', sp.has('a', '999'), false);

	const spSet = new URLSearchParams('a=1&b=2&a=3');
	spSet.set('a', '99');
	test('set replaces all', spSet.get('a'), '99');
	test('set getAll length', spSet.getAll('a').length, 1);
	test('set preserves others', spSet.get('b'), '2');

	const spApp = new URLSearchParams('a=1');
	spApp.append('a', '2');
	test('append adds entry', spApp.getAll('a').length, 2);
	test('append second value', spApp.getAll('a')[1], '2');

	const spDel = new URLSearchParams('a=1&b=2&a=3');
	spDel.delete('a');
	test('delete removes all with name', spDel.has('a'), false);
	test('delete preserves others', spDel.has('b'), true);

	const spDelVal = new URLSearchParams('a=1&a=2&a=3');
	spDelVal.delete('a', '2');
	test('delete with value removes specific', spDelVal.getAll('a').length, 2);
	test('delete with value keeps others', spDelVal.get('a'), '1');

	const spSort = new URLSearchParams('c=3&a=1&b=2&a=4');
	spSort.sort();
	test('sort first key', [...spSort.keys()][0], 'a');
	test('sort second key', [...spSort.keys()][1], 'a');
	test('sort third key', [...spSort.keys()][2], 'b');
	test('sort fourth key', [...spSort.keys()][3], 'c');
	test('sort stable: first a value', spSort.getAll('a')[0], '1');
	test('sort stable: second a value', spSort.getAll('a')[1], '4');

	test('toString serializes', new URLSearchParams('a=1&b=2').toString(), 'a=1&b=2');
	test('toString empty', new URLSearchParams().toString(), '');

	const spFE = new URLSearchParams('a=1&b=2');
	const feResults = [];
	spFE.forEach((value, name) => feResults.push(`${name}=${value}`));
	test('forEach visits all', feResults.length, 2);
	test('forEach first', feResults[0], 'a=1');
	test('forEach second', feResults[1], 'b=2');

	test('size getter', new URLSearchParams('a=1&b=2&c=3').size, 3);
	test(
	'size after append',
	(() => {
	const s = new URLSearchParams('a=1');
	s.append('b', '2');
	return s.size;
	})(),
	2
	);

	console.log('\nURLSearchParams encoding\n');

	test('space encoded as +', new URLSearchParams([['k', 'hello world']]).toString(), 'k=hello+world');
	test('+ in value encoded as %2B', new URLSearchParams([['k', 'a+b']]).toString(), 'k=a%2Bb');
	test('= in value encoded', new URLSearchParams([['k', 'a=b']]).toString(), 'k=a%3Db');
	test('& in value encoded', new URLSearchParams([['k', 'a&b']]).toString(), 'k=a%26b');

	test('* passes through', new URLSearchParams([['k', '']]).toString(), 'k=');
	test('- passes through', new URLSearchParams([['k', '-']]).toString(), 'k=-');
	test('. passes through', new URLSearchParams([['k', '.']]).toString(), 'k=.');
	test('_ passes through', new URLSearchParams([['k', '_']]).toString(), 'k=_');

	test('~ is percent-encoded', new URLSearchParams([['k', '~']]).toString(), 'k=%7E');

	test('parsing: + becomes space', new URLSearchParams('k=hello+world').get('k'), 'hello world');
	test('parsing: %20 becomes space', new URLSearchParams('k=hello%20world').get('k'), 'hello world');
	test('parsing: %2B becomes +', new URLSearchParams('k=a%2Bb').get('k'), 'a+b');

	console.log('\nURLSearchParams iterator protocol\n');

	const spi = new URLSearchParams('a=1&b=2');

	const entries = [...spi.entries()];
	test('entries length', entries.length, 2);
	test('entries first', entries[0][0], 'a');
	test('entries first value', entries[0][1], '1');

	const keys = [...spi.keys()];
	test('keys length', keys.length, 2);
	test('keys first', keys[0], 'a');
	test('keys second', keys[1], 'b');

	const vals = [...spi.values()];
	test('values length', vals.length, 2);
	test('values first', vals[0], '1');
	test('values second', vals[1], '2');

	test('Symbol.iterator is entries', spi[Symbol.iterator] === spi.entries, true);

	const forOfResults = [];
	for (const [name, value] of new URLSearchParams('x=10&y=20')) {
	forOfResults.push(`${name}=${value}`);
	}
	test('for...of first', forOfResults[0], 'x=10');
	test('for...of second', forOfResults[1], 'y=20');

	const spread = [...new URLSearchParams('p=1&q=2')];
	test('spread length', spread.length, 2);
	test('spread first pair', spread[0][0], 'p');
	test('spread first value', spread[0][1], '1');

	console.log('\nURL-URLSearchParams bidirectional sync\n');

	const syncUrl = new URL('https://example.com/?a=1');
	syncUrl.searchParams.set('b', '2');
	test('searchParams mutation updates search', syncUrl.search, '?a=1&b=2');

	syncUrl.searchParams.delete('a');
	test('searchParams delete updates search', syncUrl.search, '?b=2');

	syncUrl.searchParams.append('c', '3');
	test('searchParams append updates search', syncUrl.search, '?b=2&c=3');

	const syncUrl2 = new URL('https://example.com/?x=1');
	syncUrl2.search = '?y=2&z=3';
	test('set search updates searchParams get y', syncUrl2.searchParams.get('y'), '2');
	test('set search updates searchParams get z', syncUrl2.searchParams.get('z'), '3');
	test('set search removes old param', syncUrl2.searchParams.has('x'), false);

	const syncUrl3 = new URL('https://example.com/?a=1');
	const paramsRef1 = syncUrl3.searchParams;
	syncUrl3.search = '?b=2';
	const paramsRef2 = syncUrl3.searchParams;
	test('searchParams identity preserved', paramsRef1 === paramsRef2, true);

	console.log('\ntoStringTag\n');

	test('URL toStringTag', Object.prototype.toString.call(new URL('https://example.com')), '[object URL]');
	test('URLSearchParams toStringTag', Object.prototype.toString.call(new URLSearchParams()), '[object URLSearchParams]');

	summary();

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