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<!DOCTYPE html>
<meta charset=utf-8>
<title>File constructor: endings option</title>
<link rel=help href="https://w3c.github.io/FileAPI/#file-constructor">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// Windows platforms use CRLF as the native line ending. All others use LF.
const crlf = navigator.platform.startsWith('Win');
const native_ending = crlf ? '\r\n' : '\n';
function readBlobAsPromise(blob) {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsText(blob);
reader.onload = e => resolve(reader.result);
reader.onerror = e => reject(reader.error);
});
}
[
'transparent',
'native'
].forEach(value => test(t => {
assert_class_string(new File([], "name", {endings: value}), 'File',
`Constructor should allow "${value}" endings`);
}, `Valid "endings" value: ${JSON.stringify(value)}`));
[
null,
'',
'invalidEnumValue',
'Transparent',
'NATIVE',
0,
{}
].forEach(value => test(t => {
assert_throws_js(TypeError, () => new File([], "name", {endings: value}),
'File constructor should throw');
}, `Invalid "endings" value: ${JSON.stringify(value)}`));
test(t => {
const test_error = {name: 'test'};
assert_throws_exactly(
test_error,
() => new File([], "name", { get endings() { throw test_error; }}),
'File constructor should propagate exceptions from "endings" property');
}, 'Exception propagation from options');
test(t => {
let got = false;
new File([], "name", { get endings() { got = true; } });
assert_true(got, 'The "endings" property was accessed during construction.');
}, 'The "endings" options property is used');
[
{name: 'LF', input: '\n', native: native_ending},
{name: 'CR', input: '\r', native: native_ending},
{name: 'CRLF', input: '\r\n', native: native_ending},
{name: 'CRCR', input: '\r\r', native: native_ending.repeat(2)},
{name: 'LFCR', input: '\n\r', native: native_ending.repeat(2)},
{name: 'LFLF', input: '\n\n', native: native_ending.repeat(2)},
{name: 'CRCRLF', input: '\r\r\n', native: native_ending.repeat(2)},
{name: 'CRLFLF', input: '\r\n\n', native: native_ending.repeat(2)},
{name: 'CRLFCR', input: '\r\n\r\n', native: native_ending.repeat(2)},
{name: 'CRLFCRLF', input: '\r\n\r\n', native: native_ending.repeat(2)},
{name: 'LFCRLFCR', input: '\n\r\n\r', native: native_ending.repeat(3)},
].forEach(testCase => {
promise_test(async t => {
const file = new File([testCase.input], "name");
assert_equals(
await readBlobAsPromise(file), testCase.input,
'Newlines should not change with endings unspecified');
}, `Input ${testCase.name} with endings unspecified`);
promise_test(async t => {
const file = new File([testCase.input], "name", {endings: 'transparent'});
assert_equals(
await readBlobAsPromise(file), testCase.input,
'Newlines should not change with endings "transparent"');
}, `Input ${testCase.name} with endings 'transparent'`);
promise_test(async t => {
const file = new File([testCase.input], "name", {endings: 'native'});
assert_equals(
await readBlobAsPromise(file), testCase.native,
'Newlines should match the platform with endings "native"');
}, `Input ${testCase.name} with endings 'native'`);
});
promise_test(async t => {
const file = new File(['\r', '\n'], "name", {endings: 'native'});
const expected = native_ending.repeat(2);
assert_equals(
await readBlobAsPromise(file), expected,
'CR/LF in adjacent strings should be converted to two platform newlines');
}, `CR/LF in adjacent input strings`);
</script>
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