private EvaluatedExpression GetValueInScope(string name)
{
Contract.Requires <ArgumentNullException>(name != null, "name");
Contract.Requires <ArgumentException>(!string.IsNullOrEmpty(name));
IMethod method = _stackFrame.GetLocation().GetMethod();
// check the stack frame
if (_stackFrame.GetHasVariableInfo())
{
ILocalVariable variable = _stackFrame.GetVisibleVariableByName(name);
if (variable != null)
{
return(new EvaluatedExpression(name, name, variable, _stackFrame.GetValue(variable), false));
}
ReadOnlyCollection <ILocalVariable> variables = method.GetVariablesByName(name);
if (variables.Count > 0)
{
throw new InvalidOperationException("Evaluation failed because the variable is not visible in the current scope.");
}
}
// check the enclosing object for a visible field
IReferenceType declaringType = method.GetDeclaringType();
IField field = declaringType.GetFieldByName(name);
if (field != null)
{
if (field.GetIsStatic())
{
return(new EvaluatedExpression(name, name, null, field, declaringType.GetValue(field), false));
}
if (method.GetIsStatic())
{
throw new InvalidOperationException("The instance field cannot be accessed from a static method.");
}
return(new EvaluatedExpression(name, name, _stackFrame.GetThisObject(), field, _stackFrame.GetThisObject().GetValue(field), false));
}
// check the outer object
IField outerClassField = declaringType.GetFieldByName("this$0");
IObjectReference nestedClassInstance = null;
while (outerClassField != null)
{
if (nestedClassInstance == null)
{
nestedClassInstance = _stackFrame.GetThisObject();
}
else
{
nestedClassInstance = nestedClassInstance.GetValue(outerClassField) as IObjectReference;
}
if (nestedClassInstance == null)
{
break;
}
// what if this$0 is defined in a superclass?
IClassType fieldType = outerClassField.GetFieldType() as IClassType;
field = fieldType.GetFieldByName(name);
if (field != null)
{
if (field.GetIsStatic())
{
return(new EvaluatedExpression(name, name, null, field, fieldType.GetValue(field), false));
}
if (method.GetIsStatic())
{
throw new InvalidOperationException("The instance field cannot be accessed from a static method.");
}
return(new EvaluatedExpression(name, name, nestedClassInstance, field, nestedClassInstance.GetValue(field), false));
}
outerClassField = fieldType.GetFieldByName("this$0");
}
throw new InvalidOperationException("No member by this name is available in the current scope.");
}
