81 lines
2.2 KiB
GDScript3
81 lines
2.2 KiB
GDScript3
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static func expand_(
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mapper : Callable
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) -> Callable:
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var expand = func(source : Observable) -> Observable:
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# """Expands an observable sequence by recursively invoking
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# mapper.
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#
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# Args:
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# source: Source obserable to expand.
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#
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# Returns:
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# An observable sequence containing all the elements produced
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# by the recursive expansion.
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# """
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var subscribe = func(
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observer : ObserverBase, scheduler : SchedulerBase = null
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) -> DisposableBase:
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var scheduler_ = scheduler if scheduler == null else ImmediateScheduler.singleton()
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var queue : Array[Observable] = []
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var m = SerialDisposable.new()
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var d = CompositeDisposable.new([m])
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var active_count = RefValue.Set(0)
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var is_aquired = RefValue.Set(false)
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var ensure_active = func(__ensure_active_rec : Callable):
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var is_owner = false
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if not queue.is_empty():
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is_owner = not is_aquired.v
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is_aquired.v = true
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var action = func(scheduler : SchedulerBase, _state = null, __action_rec : Callable = func(__, ___, ____): return):
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var work : Observable
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if not queue.is_empty():
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work = queue.pop_front()
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else:
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is_aquired.v = false
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return
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var sad = SingleAssignmentDisposable.new()
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d.add(sad)
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var on_next = func(value):
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observer.on_next(value)
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var result = RefValue.Null()
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if GDRx.try(func():
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result.v = mapper.call(value)
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) \
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.catch("Error", func(err):
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observer.on_error(err)
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) \
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.end_try_catch(): return
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queue.append(result.v)
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active_count.v += 1
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__ensure_active_rec.bind(__ensure_active_rec).call()
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var on_complete = func():
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d.remove(sad)
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active_count.v -= 1
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if active_count.v == 0:
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observer.on_completed()
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sad.disposable = work.subscribe(
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on_next, observer.on_error, on_complete,
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scheduler
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)
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m.disposable = scheduler.schedule(__action_rec.bind(__action_rec))
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if is_owner:
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m.disposable = scheduler_.schedule(action.bind(action))
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queue.append(source)
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active_count.v += 1
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ensure_active.bind(ensure_active).call()
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return d
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return Observable.new(subscribe)
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return expand
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