Support lambda syntax

Support for lambda inside expression, especially to use linq methods like .Where.

See also: http://stackoverflow.com/questions/17540548/dynamic-expresso-foreach-with-lambda/19010667?noredirect=1#comment44094147_19010667

[avidenic]

Hi,

has anyone had any time to work on this? It has been 5 years =)

Best regards

[metoule]

@amoorthaemer

Hi Bert (and all the watchers), I have a working prototype! It still needs some work, but I was able to successfully run the following code:

[Test]
public void Select_inferred_return_type()
{
  var target = new Interpreter();
  var list = new List<int> { 1, 10, 19, 21 };
  target.SetVariable("myList", list);
  
  var results = target.Eval<IEnumerable<char>>("myList.Select(i => i.ToString()).Select(str => str[0])");
  
  Assert.AreEqual(4, results.Count());
  Assert.AreEqual(new[] { '1', '1', '1', '2' }, results);
}

Any example of the kind of lambda you’d want to execute would be helpful.

Note the following limitations:

• the lambda body can’t be a block
• it can’t return a new object (no .Select(i => new { Field = i }))