/// <summary>
/// Execute the initial state and any subsequent states and transitions until there are no more
/// states to execute.
/// </summary>
public IEnumerable Execute()
{
while (true)
{
// Execute the current state until it transitions or stops executing
for (
var e = state.Execute().GetEnumerator();
transition == null && e.MoveNext();
)
{
yield return(e.Current);
}
// Wait until the current state transitions
while (transition == null)
{
yield return(null);
}
// Stop listening for the current state to transition
// This prevents accidentally transitioning twice
state.OnBeginExit -= HandleStateBeginExit;
// There is no next state to transition to
// This means the state machine is finished executing
if (nextState == null)
{
break;
}
// Run the transition's exit process
foreach (var e in transition.Exit())
{
yield return(e);
}
state.EndExit();
// Switch state
State = nextState;
nextState = null;
// Run the transition's enter process
foreach (var e in transition.Enter())
{
yield return(e);
}
transition = null;
state.EndEnter();
}
}
// 実行可能なIEnumerableを返す
public IEnumerable Execute()
{
// ずっとぶん回す
while (true)
{
for (var e = state.Execute().GetEnumerator(); transition == null && e.MoveNext();)
{
yield return(e.Current);
}
while (transition == null)
{
yield return(null);
}
state.OnBeginExit -= HandleStateBeginExit;
if (nextState == null)
{
break;
}
// いまのステートが終わる時の演出
foreach (var e in transition.Exit())
{
yield return(e);
}
state.EndExit();
// ステートの切り替え
// BeginEnter()呼び出し
State = nextState;
nextState = null;
// 新しいステートが始まるときの演出
foreach (var e in transition.Enter())
{
yield return(e);
}
state.EndEnter();
transition = null;
}
}
public IEnumerable Execute()
{
while (true)
{
for (var e = state.Execute().GetEnumerator(); transition == null && e.MoveNext();)
{
yield return(e.Current);
}
while (transition == null)
{
yield return(null);
}
state.OnBeginExit -= HandleStateBeginExit;
if (nextState == null)
{
break;
}
foreach (var e in transition.Exit())
{
yield return(e);
}
state.EndExit();
State = nextState;
nextState = null;
foreach (var e in transition.Enter())
{
yield return(e);
}
transition = null;
state.EndEnter();
}
}
