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// Flags: --expose-internals
// This tests Node.js-specific behaviors of TextDecoder
'use strict';
const common = require('../common');
const assert = require('assert');
const { customInspectSymbol: inspect } = require('internal/util');
const util = require('util');
const buf = Buffer.from([0xef, 0xbb, 0xbf, 0x74, 0x65,
0x73, 0x74, 0xe2, 0x82, 0xac]);
// Make Sure TextDecoder exist
assert(TextDecoder);
// Test TextDecoder, UTF-8, fatal: false, ignoreBOM: false
{
['unicode-1-1-utf-8', 'utf8', 'utf-8'].forEach((i) => {
const dec = new TextDecoder(i);
assert.strictEqual(dec.encoding, 'utf-8');
const res = dec.decode(buf);
assert.strictEqual(res, 'test€');
});
['unicode-1-1-utf-8', 'utf8', 'utf-8'].forEach((i) => {
const dec = new TextDecoder(i);
let res = '';
res += dec.decode(buf.slice(0, 8), { stream: true });
res += dec.decode(buf.slice(8));
assert.strictEqual(res, 'test€');
});
}
// Test TextDecoder, UTF-8, fatal: false, ignoreBOM: true
{
['unicode-1-1-utf-8', 'utf8', 'utf-8'].forEach((i) => {
const dec = new TextDecoder(i, { ignoreBOM: true });
const res = dec.decode(buf);
assert.strictEqual(res, '\ufefftest€');
});
['unicode-1-1-utf-8', 'utf8', 'utf-8'].forEach((i) => {
const dec = new TextDecoder(i, { ignoreBOM: true });
let res = '';
res += dec.decode(buf.slice(0, 8), { stream: true });
res += dec.decode(buf.slice(8));
assert.strictEqual(res, '\ufefftest€');
});
}
// Test TextDecoder, UTF-8, fatal: true, ignoreBOM: false
if (common.hasIntl) {
['unicode-1-1-utf-8', 'utf8', 'utf-8'].forEach((i) => {
const dec = new TextDecoder(i, { fatal: true });
assert.throws(() => dec.decode(buf.slice(0, 8)),
{
code: 'ERR_ENCODING_INVALID_ENCODED_DATA',
name: 'TypeError',
message: 'The encoded data was not valid ' +
'for encoding utf-8'
});
});
['unicode-1-1-utf-8', 'utf8', 'utf-8'].forEach((i) => {
const dec = new TextDecoder(i, { fatal: true });
dec.decode(buf.slice(0, 8), { stream: true });
dec.decode(buf.slice(8));
});
} else {
assert.throws(
() => new TextDecoder('utf-8', { fatal: true }),
{
code: 'ERR_NO_ICU',
name: 'TypeError',
message: '"fatal" option is not supported on Node.js compiled without ICU'
});
}
// Test TextDecoder, label undefined, options null
{
const dec = new TextDecoder(undefined, null);
assert.strictEqual(dec.encoding, 'utf-8');
assert.strictEqual(dec.fatal, false);
assert.strictEqual(dec.ignoreBOM, false);
assert.strictEqual(dec[Symbol.toStringTag], 'TextDecoder');
}
// Test TextDecoder, UTF-16le
{
const dec = new TextDecoder('utf-16le');
const res = dec.decode(Buffer.from('test€', 'utf-16le'));
assert.strictEqual(res, 'test€');
}
// Test TextDecoder, UTF-16be
if (common.hasIntl) {
const dec = new TextDecoder('utf-16be');
const res = dec.decode(Buffer.from('test€', 'utf-16le').swap16());
assert.strictEqual(res, 'test€');
}
// Test TextDecoder inspect with hidden fields
{
const dec = new TextDecoder('utf-8', { ignoreBOM: true });
if (common.hasIntl) {
assert.strictEqual(
util.inspect(dec, { showHidden: true }),
'TextDecoder {\n' +
' encoding: \'utf-8\',\n' +
' fatal: false,\n' +
' ignoreBOM: true,\n' +
' [Symbol(flags)]: 4,\n' +
' [Symbol(handle)]: undefined\n' +
'}'
);
} else {
assert.strictEqual(
util.inspect(dec, { showHidden: true }),
'TextDecoder {\n' +
" encoding: 'utf-8',\n" +
' fatal: false,\n' +
' ignoreBOM: true,\n' +
' [Symbol(flags)]: 4,\n' +
' [Symbol(handle)]: StringDecoder {\n' +
" encoding: 'utf8',\n" +
' [Symbol(kNativeDecoder)]: <Buffer 00 00 00 00 00 00 01>\n' +
' }\n' +
'}'
);
}
}
// Test TextDecoder inspect without hidden fields
{
const dec = new TextDecoder('utf-8', { ignoreBOM: true });
assert.strictEqual(
util.inspect(dec, { showHidden: false }),
'TextDecoder { encoding: \'utf-8\', fatal: false, ignoreBOM: true }'
);
}
// Test TextDecoder inspect with negative depth
{
const dec = new TextDecoder();
assert.strictEqual(util.inspect(dec, { depth: -1 }), '[TextDecoder]');
}
{
const inspectFn = TextDecoder.prototype[inspect];
const decodeFn = TextDecoder.prototype.decode;
const {
encoding: { get: encodingGetter },
fatal: { get: fatalGetter },
ignoreBOM: { get: ignoreBOMGetter },
} = Object.getOwnPropertyDescriptors(TextDecoder.prototype);
const instance = new TextDecoder();
const expectedError = {
code: 'ERR_INVALID_THIS',
name: 'TypeError',
message: 'Value of "this" must be of type TextDecoder'
};
inspectFn.call(instance, Infinity, {});
decodeFn.call(instance);
encodingGetter.call(instance);
fatalGetter.call(instance);
ignoreBOMGetter.call(instance);
const invalidThisArgs = [{}, [], true, 1, '', new TextEncoder()];
invalidThisArgs.forEach((i) => {
assert.throws(() => inspectFn.call(i, Infinity, {}), expectedError);
assert.throws(() => decodeFn.call(i), expectedError);
assert.throws(() => encodingGetter.call(i), expectedError);
assert.throws(() => fatalGetter.call(i), expectedError);
assert.throws(() => ignoreBOMGetter.call(i), expectedError);
});
}
{
assert.throws(
() => new TextDecoder('utf-8', 1),
{
code: 'ERR_INVALID_ARG_TYPE',
name: 'TypeError'
}
);
}
// Test TextDecoder for incomplete UTF-8 byte sequence.
{
const decoder = new TextDecoder();
const chunk = new Uint8Array([0x66, 0x6f, 0x6f, 0xed]);
const str = decoder.decode(chunk);
assert.strictEqual(str, 'foo\ufffd');
}
if (common.hasIntl) {
try {
const decoder = new TextDecoder('Shift_JIS');
const chunk = new Uint8Array([-1]);
const str = decoder.decode(chunk);
assert.strictEqual(str, '\ufffd');
} catch (e) {
// Encoding may not be available, e.g. small-icu builds
assert.strictEqual(e.code, 'ERR_ENCODING_NOT_SUPPORTED');
}
}
{
const buffer = new ArrayBuffer(1);
new MessageChannel().port1.postMessage(buffer, [buffer]); // buffer is detached
const decoder = new TextDecoder();
assert.strictEqual(decoder.decode(buffer), '');
}
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