public void OperatorAttribute_DefaultValuesAreSet()
{
var attribute = new OperatorAttribute();
Assert.Equal(0, attribute.Precedence);
Assert.Equal(Associativity.Left, attribute.Associativity);
}
private void LookForOperatorsIn(Assembly asm)
{
foreach (Type t in asm.GetTypes())
{
if (t.IsDefined(typeof(OperatorAttribute)))
{
try
{
OperatorAttribute attr = t.GetCustomAttribute <OperatorAttribute>();
var instance = Activator.CreateInstance(t);
var infoMethods = t.GetMethods().
Where(y => y.GetCustomAttributes().OfType <ActionAttribute>().Any() && y.ReturnType == typeof(ActionResponse)).
ToDictionary(x => x.GetCustomAttribute <ActionAttribute>().Name.ToLower(), x => x);
executorDict.Add(attr.Name.ToLower(), new Executor(instance, infoMethods));
}
catch (Exception e)
{
log.Error($"Exceptio while initializing the Interpreter Instance{e.Message}");
}
}
}
}
private void Visit(BinaryExpression expr)
{
result.Append("(");
Visit(expr.Left);
result.Append(" " + OperatorAttribute.GetOperator(expr) + " ");
Visit(expr.Right);
result.Append(")");
}
public void OnImportsSatisfied()
{
// This method is called when all Imports have been resolved.
// Right now, we've a collection of resolved instances; using these instances,
// we'll populate our dictionary which contains the types that correspond with each symbol.
_expressions.Clear();
foreach (var e in _expressionImports)
{
var symbol = OperatorAttribute.GetOperator(e);
if (symbol != String.Empty)
{
if (_expressions.ContainsKey(symbol) == false)
{
_expressions.Add(symbol, e.GetType());
}
}
}
}
private static void LoadOperators()
{
System.Type nodeType = typeof(Node);
System.Reflection.Assembly assembly = System.Reflection.Assembly.GetAssembly(nodeType);
System.Type[] allTypes = assembly.GetTypes();
for (int i = 0; i < allTypes.Length; i++)
{
System.Type type = allTypes[i];
if (type.IsSubclassOf(nodeType) && !type.IsAbstract)
{
OperatorAttribute[] attributes = (OperatorAttribute[])type.GetCustomAttributes(typeof(OperatorAttribute), true);
if (attributes != null)
{
for (int attrIndex = 0; attrIndex < attributes.Length; attrIndex++)
{
OperatorAttribute operatorAttribute = attributes[attrIndex];
Interpreter.operators.Add(operatorAttribute.Symbol, new OperatorDescriptor(operatorAttribute.Priority, type));
}
}
}
}
}
private void Visit(UnaryExpression expr)
{
Visit(expr.Operand);
result.Append(OperatorAttribute.GetOperator(expr));
}
