46 lines
1.0 KiB
GDScript
46 lines
1.0 KiB
GDScript
class_name Promise extends Object
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signal _sig_finished(result: Variant)
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var _finished := false
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var _result: Variant = null
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func is_finished() -> bool:
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return _finished
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func get_result() -> Variant:
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return _result
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func join() -> Variant:
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if not _finished:
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await _sig_finished
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return _result
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func _init(arg: Variant) -> void:
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var thunk: Callable
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if arg is Callable:
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thunk = arg
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elif arg is Array:
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thunk = func():
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var subtasks: Array[Promise] = []
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var subtask_results: Array = []
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for subthunk in arg:
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subtasks.push_back(Promise.new(subthunk))
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while not subtasks.is_empty():
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subtask_results.push_front(await subtasks.pop_back().join())
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return subtask_results
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elif arg is Promise:
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thunk = func(): return await arg.join()
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elif arg is Signal:
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thunk = func(): return await arg
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else:
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thunk = func(): return arg
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var wrapper := func():
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_result = await thunk.call()
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_finished = true
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_sig_finished.emit(_result)
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wrapper.call()
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static func dummy() -> Promise:
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return Promise.new(null)
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