public void Costant()
{
var expression = new Expression {Value = TokenBuilder.Number(5)};
var linqExp = ToLinqExpressionVisitor.GetExpression(expression, "x");
Assert.IsInstanceOfType(typeof(ConstantExpression), linqExp.Body);
var constant = (ConstantExpression) linqExp.Body;
Assert.AreEqual(ExpressionType.Constant, constant.NodeType);
Assert.AreEqual(5, constant.Value);
Assert.AreEqual(typeof(Double), constant.Type);
}
public void AddBinaryExpression()
{
var expression = new Expression {Value = TokenBuilder.Variable("x")} +
new Expression {Value = TokenBuilder.Number(5)};
var linqExp = ToLinqExpressionVisitor.GetExpression(expression, "x");
Assert.IsInstanceOfType(typeof(BinaryExpression), linqExp.Body);
var binaryExpression = (BinaryExpression)linqExp.Body;
AssertBinary(binaryExpression, ExpressionType.Add);
AssertConstant(((ConstantExpression)binaryExpression.Right), 5);
AssertParameter((ParameterExpression)binaryExpression.Left, "x");
}
public void AddMultiplyPrecedence()
{
var expression = new Expression { Value = TokenBuilder.Number(6) } +
(new Expression { Value = TokenBuilder.Number(4) } *
new Expression { Value = TokenBuilder.Number(3) });
var linqExp = ToLinqExpressionVisitor.GetExpression(expression, "x");
Assert.IsInstanceOfType(typeof(BinaryExpression), linqExp.Body);
var binaryExpression = (BinaryExpression)linqExp.Body;
AssertBinary(binaryExpression, ExpressionType.Add);
AssertConstant(((ConstantExpression)binaryExpression.Left), 6);
var right = (BinaryExpression) binaryExpression.Right;
AssertBinary(right, ExpressionType.Multiply);
AssertConstant(((ConstantExpression)right.Left), 4);
AssertConstant(((ConstantExpression)right.Right), 3);
}
public void Variable()
{
var expression = new Expression { Value = TokenBuilder.Variable("x") };
var linqExp = ToLinqExpressionVisitor.GetExpression(expression, "x");
Assert.IsInstanceOfType(typeof(ParameterExpression), linqExp.Body);
var parameter = (ParameterExpression)linqExp.Body;
Assert.AreEqual(ExpressionType.Parameter, parameter.NodeType);
Assert.AreEqual("x", parameter.Name);
Assert.AreEqual(typeof(Double), parameter.Type);
}
