ILSpy/ICSharpCode.Decompiler.Tests/TestCases/Pretty/DeconstructionTests.cs

// Copyright (c) 2020 Siegfried Pammer
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Runtime.InteropServices;

namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
{
	internal class DeconstructionTests
	{
		[StructLayout(LayoutKind.Sequential, Size = 1)]
		public struct MyInt
		{
			public static implicit operator int(MyInt x)
			{
				return 0;
			}

			public static implicit operator MyInt(int x)
			{
				return default(MyInt);
			}
		}

		private class DeconstructionSource<T, T2>
		{
			public int Dummy {
				get;
				set;
			}

			public void Deconstruct(out T a, out T2 b)
			{
				a = default(T);
				b = default(T2);
			}
		}

		private class DeconstructionSource<T, T2, T3>
		{
			public int Dummy {
				get;
				set;
			}

			public void Deconstruct(out T a, out T2 b, out T3 c)
			{
				a = default(T);
				b = default(T2);
				c = default(T3);
			}
		}

		private class AssignmentTargets
		{
			public int IntField;

			public int? NullableIntField;

			public MyInt MyIntField;

			public MyInt? NullableMyIntField;

			public int Int {
				get;
				set;
			}

			public int? NInt {
				get;
				set;
			}

			public MyInt My {
				get;
				set;
			}

			public MyInt? NMy {
				get;
				set;
			}

			public static MyInt StaticMy {
				get;
				set;
			}

			public static MyInt? StaticNMy {
				get;
				set;
			}
		}

		private DeconstructionSource<T, T2> GetSource<T, T2>()
		{
			return null;
		}

		private DeconstructionSource<T, T2, T3> GetSource<T, T2, T3>()
		{
			return null;
		}

		private (T, T2) GetTuple<T, T2>()
		{
			return default((T, T2));
		}

		private (T, T2, T3) GetTuple<T, T2, T3>()
		{
			return default((T, T2, T3));
		}

		private AssignmentTargets Get(int i)
		{
			return null;
		}

		public void LocalVariable_NoConversion()
		{
			MyInt? myInt3;
			MyInt x;
			(myInt3, x) = GetSource<MyInt?, MyInt>();
			Console.WriteLine(myInt3);
			Console.WriteLine(x);
		}

		public void LocalVariable_NoConversion_DiscardFirst()
		{
			MyInt x;
			int value;
			(_, x, value) = GetSource<MyInt?, MyInt, int>();
			Console.WriteLine(x);
			Console.WriteLine(value);
		}

		public void LocalVariable_NoConversion_DiscardLast()
		{
			MyInt? myInt3;
			MyInt x;
			(myInt3, x, _) = GetSource<MyInt?, MyInt, int>();
			Console.WriteLine(myInt3);
			Console.WriteLine(x);
		}

		public void LocalVariable_NoConversion_DiscardSecond()
		{
			MyInt? myInt3;
			int value;
			(myInt3, _, value) = GetSource<MyInt?, MyInt, int>();
			Console.WriteLine(myInt3);
			Console.WriteLine(value);
		}

		public void LocalVariable_NoConversion_ReferenceTypes()
		{
			string value;
			string value2;
			(value, value2) = GetSource<string, string>();
			Console.WriteLine(value);
			Console.WriteLine(value2);
		}

		public void LocalVariable_IntToLongConversion()
		{
			int value;
			long value2;
			(value, value2) = GetSource<int, int>();
			Console.WriteLine(value);
			Console.WriteLine(value2);
		}

		public void LocalVariable_NoConversion_ComplexValue()
		{
			MyInt? myInt3;
			MyInt x;
			(myInt3, x) = new DeconstructionSource<MyInt?, MyInt> {
				Dummy = 3
			};
			Console.WriteLine(myInt3);
			Console.WriteLine(x);
		}

		public void Property_NoConversion()
		{
			(Get(0).NMy, Get(1).My) = GetSource<MyInt?, MyInt>();
		}

		public void Property_NoConversion_DiscardFirst()
		{
			(_, Get(1).My) = GetSource<MyInt?, MyInt>();
		}

		public void Property_NoConversion_DiscardLast()
		{
			(Get(0).NMy, _) = GetSource<MyInt?, MyInt>();
		}

		public void Tuple_Property_NoConversion()
		{
			(Get(0).NMy, Get(1).My) = GetTuple<MyInt?, MyInt>();
		}
	}
}