112 lines
2.7 KiB
GDScript3
112 lines
2.7 KiB
GDScript3
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static func take_while_(
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predicate : Callable = GDRx.basic.default_condition,
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inclusive : bool = false
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) -> Callable:
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var take_while = func(source : Observable) -> Observable:
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# """Returns elements from an observable sequence as long as a
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# specified condition is true.
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#
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# Example:
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# >>> take_while.call(source)
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#
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# Args:
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# source: The source observable to take from.
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#
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# Returns:
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# An observable sequence that contains the elements from the
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# input sequence that occur before the element at which the
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# test no longer passes.
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# """
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var subscribe = func(
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observer : ObserverBase,
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scheduler : SchedulerBase = null
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) -> DisposableBase:
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var running = RefValue.Set(true)
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var on_next = func(value):
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if true:
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var __ = LockGuard.new(source.lock)
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if not running.v:
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return
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if GDRx.try(func():
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running.v = predicate.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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).end_try_catch(): return
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if running.v:
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observer.on_next(value)
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else:
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if inclusive:
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observer.on_next(value)
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observer.on_completed()
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return source.subscribe(
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on_next, observer.on_error, observer.on_completed,
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scheduler
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)
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return Observable.new(subscribe)
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return take_while
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static func take_while_indexed_(
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predicate : Callable = GDRx.basic.default_condition,
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inclusive : bool = false
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) -> Callable:
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var take_while_indexed = func(source : Observable) -> Observable:
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# """Returns elements from an observable sequence as long as a
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# specified condition is true. The element's index is used in the
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# logic of the predicate function.
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#
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# Example:
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# >>> take_while_indexed.call(source)
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#
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# Args:
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# source: Source observable to take from.
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#
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# Returns:
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# An observable sequence that contains the elements from the
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# input sequence that occur before the element at which the
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# test no longer passes.
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# """
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var subscribe = func(
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observer : ObserverBase,
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scheduler : SchedulerBase = null
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) -> DisposableBase:
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var running = RefValue.Set(true)
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var i = RefValue.Set(0)
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var on_next = func(value):
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if true:
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var __ = LockGuard.new(source.lock)
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if not running.v:
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return
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if GDRx.try(func():
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running.v = predicate.call(value, i.v)
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) \
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.catch("Error", func(err):
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observer.on_error(err)
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).end_try_catch(): return
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else:
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i.v += 1
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if running.v:
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observer.on_next(value)
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else:
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if inclusive:
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observer.on_next(value)
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observer.on_completed()
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return source.subscribe(
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on_next, observer.on_error, observer.on_completed,
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scheduler
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)
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return Observable.new(subscribe)
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return take_while_indexed
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