public void ParseBinaryWithNullRightHandSide()
{
string rightHandSide = null;
Expression<Func<bool>> f = () => "foo" == rightHandSide;
var node = ExpressionParser.Parse(f.Body);
var expected = new BinaryNode
{
Left = new ConstantNode { Text = "\"foo\"" },
Right = new ConstantNode { Text = "rightHandSide", Value = "null" },
Operator = "==",
Value = "False"
};
Assert.AreEqual(expected, node);
}
public void ParseUnaryNotAsPartOfBinaryOperation()
{
var v = true;
Expression<Func<bool>> f = () => !v == false;
var node = ExpressionParser.Parse(f.Body);
var expected = new BinaryNode
{
Left = new UnaryNode
{
Prefix = "!",
PrefixValue = "False",
Operand = new ConstantNode() { Text = "v", Value = "True" },
},
Right = new ConstantNode { Text = "False", Value = null },
Operator = "==",
Value = "True"
};
Assert.AreEqual(expected, node);
}
public void ParseIsOperator()
{
object x = "xValue";
Expression<Func<bool>> f = () => x is string;
var node = ExpressionParser.Parse(f.Body);
var expected = new BinaryNode()
{
Left = new ConstantNode() {Text = "x", Value = "\"xValue\""},
Operator = "is",
Right = new ConstantNode() { Text = "string" },
Value = "True"
};
Assert.AreEqual(expected, node);
}
public void ParseCoalesce()
{
string x = null;
Expression<Func<string>> f = () => x ?? "foo";
var p = new ExpressionParser(f.Body);
var node = p.Parse();
var expected = new BinaryNode
{
Left = new ConstantNode { Text = "x", Value = "null" },
Right = new ConstantNode { Text = "\"foo\"" },
Operator = "??",
Value = "\"foo\""
};
Assert.AreEqual(expected, node);
}