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// Copyright (c) 2014, the Dart project authors. All rights reserved.
// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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// @dart = 2.9
import 'v8_regexp_utils.dart';
import 'package:expect/expect.dart';
void main() {
description('Tests that regular expressions treat non-BMP characters as two separate characters. ' +
'From a Unicode correctness point of view this is wrong, but it is what other browsers do. ' +
'And given that we store strings as UTF-16, it is also more efficient to implement. ' +
'Also test some other cases related to UTF-8 and UTF-16.');
var surrogatePair =
new String.fromCharCode(0xD800) + new String.fromCharCode(0xDC00);
assertEquals(new RegExp(r".").firstMatch(surrogatePair).group(0).length, 1);
assertEquals(new RegExp(r"\D").firstMatch(surrogatePair).group(0).length, 1);
assertEquals(new RegExp(r"\S").firstMatch(surrogatePair).group(0).length, 1);
assertEquals(new RegExp(r"\W").firstMatch(surrogatePair).group(0).length, 1);
assertEquals(
new RegExp(r"[^x]").firstMatch(surrogatePair).group(0).length, 1);
assertEquals(
new RegExp(r".{1,2}")
.firstMatch("!!" + new String.fromCharCode(0xA1))
.group(0)
.length,
2);
shouldBeNull(new RegExp(r".").firstMatch(""));
}