tests/corelib_2/regexp/toString_test.dart

// 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() {
  dynamic testForwardSlash(pattern, _string) {
    var string = _string;

    var re1 = new RegExp(pattern);

    return re1.hasMatch(string);
  }

  dynamic testLineTerminator(pattern) {
    var re1 = new RegExp(pattern);

    return new RegExp(r"\n|\r|\u2028|\u2029").hasMatch(re1.toString());
  }

  // These strings are equivalent, since the '\' is identity escaping the '/' at the string level.
  shouldBeTrue(testForwardSlash("^/\$", "/"));
  shouldBeTrue(testForwardSlash("^\/\$", "/"));
  // This string passes "^\/$" to the RegExp, so the '/' is escaped in the re!
  shouldBeTrue(testForwardSlash("^\\/\$", "/"));
  // These strings pass "^\\/$" and "^\\\/$" respectively to the RegExp, giving one '\' to match.
  shouldBeTrue(testForwardSlash("^\\\\/\$", "\\/"));
  shouldBeTrue(testForwardSlash("^\\\\\\/\$", "\\/"));
  // These strings match two backslashes (the second with the '/' escaped).
  shouldBeTrue(testForwardSlash("^\\\\\\\\/\$", "\\\\/"));
  shouldBeTrue(testForwardSlash("^\\\\\\\\\\/\$", "\\\\/"));
  // Test that nothing goes wrongif there are multiple forward slashes!
  shouldBeTrue(testForwardSlash("x/x/x", "x/x/x"));
  shouldBeTrue(testForwardSlash("x\\/x/x", "x/x/x"));
  shouldBeTrue(testForwardSlash("x/x\\/x", "x/x/x"));
  shouldBeTrue(testForwardSlash("x\\/x\\/x", "x/x/x"));

  shouldBeFalse(testLineTerminator("\\n"));
  shouldBeFalse(testLineTerminator("\\\\n"));
  shouldBeFalse(testLineTerminator("\\r"));
  shouldBeFalse(testLineTerminator("\\\\r"));
  shouldBeFalse(testLineTerminator("\\u2028"));
  shouldBeFalse(testLineTerminator("\\\\u2028"));
  shouldBeFalse(testLineTerminator("\\u2029"));
  shouldBeFalse(testLineTerminator("\\\\u2029"));
}