private static IDictionary ResolveToDictionary(VariableExpression expression, IBindingEnvironment environment)
{
string name = expression.VariableName;
object obj = environment.GetValue(name);
if (obj == null)
{
obj = new Hashtable();
// TODO Review if Local or not
environment.SetValue(name, obj);
}
return (IDictionary)obj;
}
private static void SetValue(VariableExpression expression, object value, IBindingEnvironment environment)
{
environment.SetValue(expression.VariableName, value);
}
private static object ResolveToObject(VariableExpression expression, IBindingEnvironment environment)
{
string name = expression.VariableName;
object obj = environment.GetValue(name);
if (obj == null)
{
obj = new DynamicObject();
// TODO Review if Local or not
environment.SetValue(name, obj);
}
return obj;
}
public void UndefinedVariableIsNull()
{
BindingEnvironment environment = new BindingEnvironment();
VariableExpression var = new VariableExpression("foo");
Assert.IsNull(var.Evaluate(environment));
}
public void EvaluateVariableExpressions()
{
BindingEnvironment environment = new BindingEnvironment();
environment.SetValue("foo", "bar");
environment.SetValue("one", 1);
VariableExpression varFoo = new VariableExpression("foo");
VariableExpression varOne = new VariableExpression("one");
Assert.AreEqual("bar", varFoo.Evaluate(environment));
Assert.AreEqual(1, varOne.Evaluate(environment));
}
public void ResolveVariableExpressionToDictionary()
{
BindingEnvironment environment = new BindingEnvironment();
IExpression expression = new VariableExpression("foo");
object obj = ExpressionUtilities.ResolveToDictionary(expression, environment);
Assert.IsNotNull(obj);
Assert.IsInstanceOfType(obj, typeof(IDictionary));
Assert.AreEqual(obj, environment.GetValue("foo"));
}
public void ExecuteWhileCommand()
{
IExpression incrementX = new ArithmeticBinaryExpression(ArithmeticOperator.Add, new ConstantExpression(1), new VariableExpression("x"));
IExpression decrementY = new ArithmeticBinaryExpression(ArithmeticOperator.Subtract, new VariableExpression("y"), new ConstantExpression(1));
ICommand setX = new SetVariableCommand("x", incrementX);
ICommand setY = new SetVariableCommand("y", decrementY);
List<ICommand> commands = new List<ICommand>();
commands.Add(setX);
commands.Add(setY);
ICommand command = new CompositeCommand(commands);
IExpression yexpr = new VariableExpression("y");
WhileCommand whilecmd = new WhileCommand(yexpr, command);
BindingEnvironment environment = new BindingEnvironment();
environment.SetValue("x", 0);
environment.SetValue("y", 5);
whilecmd.Execute(environment);
Assert.AreEqual(0, environment.GetValue("y"));
Assert.AreEqual(5, environment.GetValue("x"));
}