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// Decode an URL encoded string, using XHR and data: URL. Returns a Promise.
function decode(label, url_encoded_string) {
return new Promise((resolve, reject) => {
const req = new XMLHttpRequest;
req.open('GET', `data:text/plain,${url_encoded_string}`);
req.overrideMimeType(`text/plain; charset="${label}"`);
req.send();
req.onload = () => resolve(req.responseText);
req.onerror = () => reject(new Error(req.statusText));
});
}
// Convert code units in a decoded string into: "U+0001/U+0002/...'
function to_code_units(string) {
return string.split('')
.map(unit => unit.charCodeAt(0))
.map(code => 'U+' + ('0000' + code.toString(16).toUpperCase()).slice(-4))
.join('/');
}
function decode_test(label,
url_encoded_input,
expected_code_units,
description) {
promise_test(() => {
return decode(label, url_encoded_input)
.then(decoded => to_code_units(decoded))
.then(actual => {
assert_equals(actual, expected_code_units, `Decoding with ${label}`);
});
}, description);
}
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