sdk/tests/language/const/string_test.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import "package:expect/expect.dart";

// Exercises compile-time string constants

const yz = "y" + "z";

main() {
  // Constant comparisons are independent of the quotes used.
  Expect.isTrue(identical("abcd", 'abcd'));
  Expect.isTrue(identical('abcd', "abcd"));
  Expect.isTrue(identical("ab\"cd", 'ab"cd'));
  Expect.isTrue(identical('ab\'cd', "ab'cd"));

  // String concatenation works even when quotes are different.
  Expect.isTrue(
    identical(
      "abcd",
      "ab"
          "cd",
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      "ab"
          'cd',
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      'ab'
          'cd',
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      'ab'
          "cd",
    ),
  );

  // Or when there are more than 2 concatenations.
  Expect.isTrue(
    identical(
      "abcd",
      "a"
          "b"
          "cd",
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      "a"
          "b"
          "c"
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      'abcd',
      'a'
          'b'
          'c'
          'd',
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      "a"
          "b"
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      'a'
          'b'
          'c'
          'd',
    ),
  );
  Expect.isTrue(
    identical(
      "abcd",
      'a'
          "b"
          'c'
          "d",
    ),
  );

  Expect.isTrue(
    identical(
      "a'b'cd",
      "a"
          "'b'"
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      "a\"b\"cd",
      "a"
          '"b"'
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      "a\"b\"cd",
      "a"
          '"b"'
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      "a'b'cd",
      'a'
          "'b'"
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      'a\'b\'cd',
      "a"
          "'b'"
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      'a"b"cd',
      'a'
          '"b"'
          'c'
          "d",
    ),
  );
  Expect.isTrue(
    identical(
      "a\"b\"cd",
      'a'
          '"b"'
          'c'
          "d",
    ),
  );

  const a = identical("ab", "a" + "b");
  Expect.isTrue(a);

  const b = identical("xyz", "x" + yz);
  Expect.isTrue(b);

  const c = identical(
    "12",
    "1"
        "2",
  );
  Expect.isTrue(c);

  const d = identical("zyz", "z$yz");
  Expect.isTrue(d);
}