static void Run()
{
while (true)
{
var consoleInput = ReadFromConsole();
if (string.IsNullOrWhiteSpace(consoleInput)) continue;
try
{
var command = new ConsoleCommand(consoleInput);
string result = Execute(command);
WriteToConsole(result);
}
catch (Exception ex)
{
WriteToConsole(ex.Message);
}
}
}
static string Execute(ConsoleCommand command)
{
string invalidOperation = "Command does not exist";
//check command exists
if (!_commandLibraries.ContainsKey(command.LibraryClassName))
{
return invalidOperation;
}
var methodDictionary = _commandLibraries[command.LibraryClassName];
if (!methodDictionary.ContainsKey(command.Name))
{
return invalidOperation;
}
//Validate paramters are correct
var methodParameterValueList = new List<object>();
IEnumerable<ParameterInfo> paramInfoList = methodDictionary[command.Name].ToList();
var requiredParams = paramInfoList.Where(p => p.IsOptional == false);
var optionalParams = paramInfoList.Where(p => p.IsOptional == true);
int requiredCount = requiredParams.Count();
int optionalCount = optionalParams.Count();
int providedCount = command.Arguments.Count();
if (requiredCount > providedCount)
{
return string.Format(
"Missing required arguments. {0} required, {1} optional, {2} provided",
requiredCount, optionalCount, providedCount);
}
//TODO get required parameter names/info
if (paramInfoList.Count() > 0)
{
//returns null if the parameter is required. TODO modify this to a dictionary of parameter names and values
foreach (var param in paramInfoList)
{
methodParameterValueList.Add(param.DefaultValue);
}
}
//parse provided parameters/////////////////////////////////////////////////////
for (int i = 0; i < command.Arguments.Count(); i++)
{
var methodParam = paramInfoList.ElementAt(i);
var typeRequired = methodParam.ParameterType;
object value = null;
try
{
value = CoerceArgument(typeRequired, command.Arguments.ElementAt(i));
methodParameterValueList.RemoveAt(i);
methodParameterValueList.Insert(i, value);
}
catch (ArgumentException)
{
string argumentName = methodParam.Name;
string argumentTypeName = typeRequired.Name;
string message = string.Format(
"The value passes for argument '{0}' cannot be parsed to type '{1}'",
argumentName, argumentTypeName);
throw new ArgumentException(message);
}
//////////////////////////////////////////////////////////////////////////////
}
//invoke the method using reflection
Assembly currentAssembly = typeof(Program).GetTypeInfo().Assembly;
Type commandLibraryClass = currentAssembly.GetType(_commandNamespace + "." + command.LibraryClassName);
object[] inputArgs = null;
if (methodParameterValueList.Count > 0)
{
inputArgs = methodParameterValueList.ToArray();
}
var typeInfo = commandLibraryClass;
try
{
var method = typeInfo.GetTypeInfo().GetMethod(command.Name, BindingFlags.InvokeMethod | BindingFlags.Static | BindingFlags.Public);
var result = method.Invoke(null, inputArgs);
return result.ToString();
}
catch (TargetInvocationException ex)
{
throw ex.InnerException;
}
}