/// <summary>
/// Инициализация драйвера меню.
/// </summary>
public MenuDriver()
{
this.rootContext = new MenuContext ();
this.current = this.rootContext;
}
/// <inheritdoc />
public void ToRoot()
{
this.current = this.rootContext;
}
/// <inheritdoc />
public void SetRootContext(IMenuContext context)
{
if (context == null)
throw new ArgumentNullException ("context");
if (!(context is MenuContext))
throw new InvalidCastException ();
this.rootContext = context as MenuContext;
this.current = this.rootContext;
}
/// <inheritdoc />
public void ToParent()
{
if (this.current == this.rootContext)
return;
this.current = this.current.Parent as MenuContext;
}
/// <summary>
/// Исполняет команду, указанную в строке.
/// </summary>
/// <remarks>
/// При исполнении команды происходит автодополнение контекстов и команды.
/// </remarks>
/// <param name = "command">Команда, которую нужно исполнить.</param>
/// <exception cref = "ArgumentNullException"><paramref name = "command" /> является <c>null</c>.</exception>
/// <exception cref = "MenuCommandNotFoundException">Команда не найдена.</exception>
/// <exception cref = "MenuElementNameIsAmbiguousException">Название элемента меню неоднозначно.</exception>
/// <exception cref = "NotEnoughParametersException">Недостаточно параметров контекста.</exception>
public void Invoke(string command)
{
if (command == null)
throw new ArgumentNullException ("command");
var tokens = new Queue <string> (command.Split (new [] { ' ' }, StringSplitOptions.RemoveEmptyEntries));
var context = this.current;
var context_params = new Dictionary <MenuContext, List <string>> ();
while (tokens.Count != 0) {
var token = tokens.Dequeue ();
if (token.Equals (COMMAND_PARENT)) {
context = (context.Parent ?? this.rootContext) as MenuContext;
continue;
}
if (token.Equals (COMMAND_ROOT)) {
context = this.rootContext;
continue;
}
var completion = Completion (context, token);
var count = completion.Count (_ => _.Name == token);
if (completion.Count () == 0)
throw new MenuCommandNotFoundException (token, context.Name);
if (count == 1)
completion = completion.Where (_ => _.Name == token);
else if (completion.Count () > 1)
throw new MenuElementNameIsAmbiguousException (token, context.Name);
var elem = completion.First ();
if (elem is IMenuContextView) {
context = elem as MenuContext;
if (context.ParametersCount > tokens.Count)
throw new NotEnoughParametersException (context.Name, tokens.Count, context.ParametersCount);
var parameters = new List <string> ();
for (var i = 0; i < context.ParametersCount; ++ i)
parameters.Add (tokens.Dequeue ());
if (!context_params.ContainsKey (context))
context_params.Add (context, parameters);
else
context_params [context] = parameters;
continue;
}
if (elem is IMenuCommandView) {
this.current = context;
foreach (var param in context_params) {
for (var i = 0; i < param.Value.Count; ++i)
param.Key [i] = param.Value [i];
}
(elem as MenuCommand).Invoke (tokens.ToArray ());
break;
}
}
this.current = context;
foreach (var param in context_params) {
for (var i = 0; i < param.Value.Count; ++i)
param.Key [i] = param.Value [i];
}
}
