// META: title=Encoding API: Fatal flag

var bad = [
    { encoding: 'utf-8', input: [0xFF], name: 'invalid code' },
    { encoding: 'utf-8', input: [0xC0], name: 'ends early' },
    { encoding: 'utf-8', input: [0xE0], name: 'ends early 2' },
    { encoding: 'utf-8', input: [0xC0, 0x00], name: 'invalid trail' },
    { encoding: 'utf-8', input: [0xC0, 0xC0], name: 'invalid trail 2' },
    { encoding: 'utf-8', input: [0xE0, 0x00], name: 'invalid trail 3' },
    { encoding: 'utf-8', input: [0xE0, 0xC0], name: 'invalid trail 4' },
    { encoding: 'utf-8', input: [0xE0, 0x80, 0x00], name: 'invalid trail 5' },
    { encoding: 'utf-8', input: [0xE0, 0x80, 0xC0], name: 'invalid trail 6' },
    { encoding: 'utf-8', input: [0xFC, 0x80, 0x80, 0x80, 0x80, 0x80], name: '> 0x10FFFF' },
    { encoding: 'utf-8', input: [0xFE, 0x80, 0x80, 0x80, 0x80, 0x80], name: 'obsolete lead byte' },

    // Overlong encodings
    { encoding: 'utf-8', input: [0xC0, 0x80], name: 'overlong U+0000 - 2 bytes' },
    { encoding: 'utf-8', input: [0xE0, 0x80, 0x80], name: 'overlong U+0000 - 3 bytes' },
    { encoding: 'utf-8', input: [0xF0, 0x80, 0x80, 0x80], name: 'overlong U+0000 - 4 bytes' },
    { encoding: 'utf-8', input: [0xF8, 0x80, 0x80, 0x80, 0x80], name: 'overlong U+0000 - 5 bytes' },
    { encoding: 'utf-8', input: [0xFC, 0x80, 0x80, 0x80, 0x80, 0x80], name: 'overlong U+0000 - 6 bytes' },

    { encoding: 'utf-8', input: [0xC1, 0xBF], name: 'overlong U+007F - 2 bytes' },
    { encoding: 'utf-8', input: [0xE0, 0x81, 0xBF], name: 'overlong U+007F - 3 bytes' },
    { encoding: 'utf-8', input: [0xF0, 0x80, 0x81, 0xBF], name: 'overlong U+007F - 4 bytes' },
    { encoding: 'utf-8', input: [0xF8, 0x80, 0x80, 0x81, 0xBF], name: 'overlong U+007F - 5 bytes' },
    { encoding: 'utf-8', input: [0xFC, 0x80, 0x80, 0x80, 0x81, 0xBF], name: 'overlong U+007F - 6 bytes' },

    { encoding: 'utf-8', input: [0xE0, 0x9F, 0xBF], name: 'overlong U+07FF - 3 bytes' },
    { encoding: 'utf-8', input: [0xF0, 0x80, 0x9F, 0xBF], name: 'overlong U+07FF - 4 bytes' },
    { encoding: 'utf-8', input: [0xF8, 0x80, 0x80, 0x9F, 0xBF], name: 'overlong U+07FF - 5 bytes' },
    { encoding: 'utf-8', input: [0xFC, 0x80, 0x80, 0x80, 0x9F, 0xBF], name: 'overlong U+07FF - 6 bytes' },

    { encoding: 'utf-8', input: [0xF0, 0x8F, 0xBF, 0xBF], name: 'overlong U+FFFF - 4 bytes' },
    { encoding: 'utf-8', input: [0xF8, 0x80, 0x8F, 0xBF, 0xBF], name: 'overlong U+FFFF - 5 bytes' },
    { encoding: 'utf-8', input: [0xFC, 0x80, 0x80, 0x8F, 0xBF, 0xBF], name: 'overlong U+FFFF - 6 bytes' },

    { encoding: 'utf-8', input: [0xF8, 0x84, 0x8F, 0xBF, 0xBF], name: 'overlong U+10FFFF - 5 bytes' },
    { encoding: 'utf-8', input: [0xFC, 0x80, 0x84, 0x8F, 0xBF, 0xBF], name: 'overlong U+10FFFF - 6 bytes' },

    // UTF-16 surrogates encoded as code points in UTF-8
    { encoding: 'utf-8', input: [0xED, 0xA0, 0x80], name: 'lead surrogate' },
    { encoding: 'utf-8', input: [0xED, 0xB0, 0x80], name: 'trail surrogate' },
    { encoding: 'utf-8', input: [0xED, 0xA0, 0x80, 0xED, 0xB0, 0x80], name: 'surrogate pair' },

    { encoding: 'utf-16le', input: [0x00], name: 'truncated code unit' },
    // Mismatched UTF-16 surrogates are exercised in utf16-surrogates.html

    // FIXME: Add legacy encoding cases
];

bad.forEach(function(t) {
    test(function() {
        assert_throws(new TypeError(), function() {
            new TextDecoder(t.encoding, {fatal: true}).decode(new Uint8Array(t.input))
        });
    }, 'Fatal flag: ' + t.encoding + ' - ' + t.name);
});

test(function() {
    assert_true('fatal' in new TextDecoder(), 'The fatal attribute should exist on TextDecoder.');
    assert_equals(typeof  new TextDecoder().fatal, 'boolean', 'The type of the fatal attribute should be boolean.');
    assert_false(new TextDecoder().fatal, 'The fatal attribute should default to false.');
    assert_true(new TextDecoder('utf-8', {fatal: true}).fatal, 'The fatal attribute can be set using an option.');

}, 'The fatal attribute of TextDecoder');

test(() => {
  const bytes = new Uint8Array([226, 153, 165]);
  const decoder = new TextDecoder('utf-8', {fatal: true});
  assert_equals(decoder.decode(new DataView(bytes.buffer, 0, 3)),
                '♥',
                'decode() should decode full sequence');
  assert_throws(new TypeError,
                () => decoder.decode(new DataView(bytes.buffer, 0, 2)),
                'decode() should throw on incomplete sequence');
  assert_equals(decoder.decode(new DataView(bytes.buffer, 0, 3)),
                '♥',
                'decode() should not throw on subsequent call');
}, 'Error seen with fatal does not prevent future decodes');