public void IfTrueThen()
{
var condition = new CompareExpression(ComparisonOperator.Less, new VariableExpression("a"), new ConstantExpression(10));
var thencommand = new SetVariableCommand("k", new ConstantExpression(1));
var ifcommand = new IfCommand(condition, thencommand);
Context context = new Context();
context.SetValue("a", 1);
context.SetValue("k", 0);
var result = ifcommand.Execute(context);
Assert.IsNull(result);
Assert.IsNotNull(ifcommand.Condition);
Assert.IsNotNull(ifcommand.ThenCommand);
Assert.IsNull(ifcommand.ElseCommand);
Assert.AreEqual(1, context.GetValue("k"));
}
public void WhileWithAddExpression()
{
var expression = new CompareExpression(ComparisonOperator.Less, new VariableExpression("a"), new ConstantExpression(10));
var inccommand = new SetVariableCommand("k", new ArithmeticBinaryExpression(ArithmeticOperator.Add, new VariableExpression("k"), new ConstantExpression(1)));
var addcommand = new SetVariableCommand("a", new ArithmeticBinaryExpression(ArithmeticOperator.Add, new VariableExpression("k"), new VariableExpression("a")));
var command = new CompositeCommand(new ICommand[] { inccommand, addcommand });
var whilecommand = new WhileCommand(expression, command);
Context context = new Context();
context.SetValue("a", 0);
context.SetValue("k", 0);
var result = whilecommand.Execute(context);
Assert.IsNull(result);
Assert.IsNotNull(whilecommand.Condition);
Assert.IsNotNull(whilecommand.Command);
Assert.AreEqual(4, context.GetValue("k"));
Assert.AreEqual(10, context.GetValue("a"));
}
private static bool EvaluateComparisonOperator(ComparisonOperator operation, object left, object right)
{
IExpression expression = new CompareExpression(operation, new ConstantExpression(left), new ConstantExpression(right));
return (bool) expression.Evaluate(null);
}
