tests/corelib_2/regexp/non-bmp_test.dart

// Copyright (c) 2014, the Dart project authors. All rights reserved.
// Copyright 2013 the V8 project authors. 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(""));
}