Language/Expressions/Strings/String_Interpolation/syntax_t17.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.

/// @assertion It is possible to embed expressions within non-raw string
/// literals, such that these expressions are evaluated, and the resulting
/// values are converted into strings and concatenated with the enclosing
/// string. This process is known as string interpolation.
/// stringInterpolation:
///   '$' IDENTIFIER_NO_DOLLAR |
///   '$' '{' expression '}'
/// ;
/// @description Checks that it is not a compile-time error when an
/// interpolation construct in a multi-line string is an expression that is
/// broken up by newlines where whitespace characters are allowed and that such
/// expression is evaluated correctly.
/// @author rodionov

import '../../../../Utils/expect.dart';

main() {
  String s1 = """${2
  		*

  		2
    }""";

  Expect.equals("4", s1);

  String s2 = '''${3
    *

    4
  }''';
  Expect.equals("12", s2);

  String s3 = """${
    "foo"
    'bar'
  }""";
  Expect.equals("foobar", s3);

  String s4 = '''${
    'bar'
    "foo"
  }''';
  Expect.equals("barfoo", s4);
}