public void EvaluationVisit(string input, int value)
{
var lexer = new Lexer(input);
var parser = new Parser(lexer);
INode tree = parser.Parse();
var visitor = new EvaluationVisitor();
int result = visitor.Visit(tree);
Assert.That(result, Is.EqualTo(value));
}
public void LogicalExpressionShouldHandlePrecedence()
{
BinaryExpresssion expression = LogicalExpression.Create(Parse("3 * (5 + 2)")) as BinaryExpresssion;
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(21, visitor.Result);
Assert.AreEqual(40, new Expression("5 * 2 ^ 3").Evaluate());
}
public void LogicalExpressionShouldCreateTimes()
{
BinaryExpresssion expression = LogicalExpression.Create(Parse("3 * 2")) as BinaryExpresssion;
Assert.IsNotNull(expression);
Assert.AreEqual(BinaryExpressionType.Times, expression.Type);
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(6, visitor.Result);
}
public void LogicalExpressionShouldCreateNot()
{
UnaryExpression expression = LogicalExpression.Create(Parse("not true")) as UnaryExpression;
Assert.IsNotNull(expression);
Assert.AreEqual(typeof(Value), expression.Expression.GetType());
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(false, visitor.Result);
}
public void LogicalExpressionShouldCreateInteger()
{
Value expression = LogicalExpression.Create(Parse("2")) as Value;
Assert.IsNotNull(expression);
Assert.AreEqual("2", expression.Text);
EvaluationVisitor visitor = new EvaluationVisitor();
visitor.Visit(expression);
Assert.AreEqual(2, visitor.Result);
}