Improve bitwise operations support

[metoule]

Add support of the unary bitwise complement operator (~)
Add support of the shift operators (>> and <<)
Fix #206

var target = new Interpreter();
var x = 0b_1100_1001_0000_0000_0000_0000_0001_0001;
target.SetVariable("x", x);

Assert.Equal(~x, target.Eval<uint>("~x"));
Assert.Equal(x >> 4, target.Eval<uint>("x >> 4"));
Assert.Equal(x << 4, target.Eval<uint>("x << 4"));

[metoule]

Note that I didn't add new tokens for the shift operators >> and << because it would prevent the proper parsing of generic type definitions such as List<List<int>>.

[davideicardi]

Very good! Just a small comment.

[waclaw66]

Could you please add directives to unit tests for language versions that do not support it yet?

[metoule]

Which language versions don't support it? The tests ran successfully for .NET Framework 4.5 and 4.6.1 and .NET Core 3.1 and 5.0.

[waclaw66]

[metoule]

That's really strange - which version of Visual Studio are you using? It should work out of the box from VS2019 onwards.
If you can't upgrade Visual Studio, that's not a huge deal: it's just syntaxic sugar to declare an integer from its binary representation.

You can replace replace that variable declaration with any integer, for example var x = 123, and the test will be the same.

For the other tests,

var a = 0b_1111_1000;
var b = 0b_0001_1100;

can be replaced with

var a = 248;
var b = 28;

Be careful for test Bitwise_operations_uint_int, the variable x must be an unsigned integer var x = 248u.

[metoule]

Or you can install VS community edition :)

[waclaw66]

I use VS2017, that is the problem :D
Problem solved. I just needed to switch to latest minor...