92 lines
2.6 KiB
GDScript
92 lines
2.6 KiB
GDScript
extends Node
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class Result extends Reference:
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var is_ok: bool
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var value = null
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static func make_value(p_value):
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var result := Result.new()
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result.is_ok = true
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result.value = p_value
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return result
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static func make_error(error):
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var result := Result.new()
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result.is_ok = false
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# todo: Proper error object / convention.
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result.value = [error, get_stack().slice(1, -1)]
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return result
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class Promise extends Reference:
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var is_done: bool = false
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var is_ok: bool
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var value = null
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signal done()
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static func from(capture: GDScriptFunctionState):
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var result := Promise.new()
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if capture.connect("completed", result, "_result_arrived") != OK:
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assert("Bruh")
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return result
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static func make_value(p_value):
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var result := Promise.new()
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result.is_done = true
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result.is_ok = true
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result.value = p_value
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return result
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static func make_error(error):
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var result := Promise.new()
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result.is_done = true
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result.is_ok = false
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result.value = [error, get_stack().slice(1, -1)]
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return result
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# todo: Use Error class value for erroneous state instead.
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func _result_arrived(p_result) -> void:
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self.is_done = true
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self.is_ok = true
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self.value = p_result
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emit_signal("done")
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static func are_promises_done(promises: Array) -> bool:
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for promise in promises:
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assert(promise is Promise)
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if not promise.is_done:
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return false
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return true
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static func are_promises_ok(promises: Array) -> bool:
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for promise in promises:
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assert(promise is Promise)
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assert(promise.is_done)
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if not promise.is_ok:
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return false
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return true
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static func collect_promise_values(promises: Array) -> Array:
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var result := Array()
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for promise in promises:
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assert(promise is Promise)
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assert(promise.is_done)
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# todo: Don't do this.
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if promise.value is Result:
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assert(promise.value.is_ok)
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result.push_back(promise.value.value)
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else: result.push_back(promise.value)
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return result
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static func collect_promise_errors(promises: Array) -> Array:
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var result := Array()
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for promise in promises:
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assert(promise is Promise)
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assert(promise.is_done)
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if not promise.is_ok:
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result.push_back(promise.value)
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# todo: Don't do this.
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elif promise.value is Result and not promise.value.is_ok:
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result.push_back(promise.value.value)
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return result
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