65 lines
1.6 KiB
GDScript3
65 lines
1.6 KiB
GDScript3
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static func slice_(
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start : int = 0,
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stop : int = GDRx.util.MAX_SIZE,
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step : int = 1
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) -> Callable:
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var _start = start
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var _stop = stop
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var _step = step
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var pipeline : Array[Callable] = []
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var slice = func(source : Observable) -> Observable:
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# """The partially applied slice operator.
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#
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# Slices the given observable. It is basically a wrapper around the operators
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# GDRx.op.skip,
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# GDRx.op.skip_last,
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# GDRx.op.take,
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# GDRx.op.take_last and
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# GDRx.op.filter.
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#
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# The following diagram helps you remember how slices works with streams.
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#
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# Positive numbers are relative to the start of the events, while negative
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# numbers are relative to the end (close) of the stream.
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#
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# .. code::
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#
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# r---e---a---c---t---i---v---e---!
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# 0 1 2 3 4 5 6 7 8
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# -8 -7 -6 -5 -4 -3 -2 -1 0
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#
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# Examples:
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# >>> var result = source.pipe1(GDRx.op.slice(1, 10))
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# >>> var result = source.pipe1(GDRx.op.slice(1, -2))
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# >>> var result = source.pipe1(GDRx.op.slice(1, -1, 2))
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#
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# Args:
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# source: Observable to slice
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#
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# Returns:
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# A sliced observable sequence.
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# """
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if _stop >= 0:
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pipeline.append(GDRx.op.take(_stop))
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if _start > 0:
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pipeline.append(GDRx.op.skip(_start))
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elif _start < 0:
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pipeline.append(GDRx.op.take_last(-_start))
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if _stop < 0:
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pipeline.append(GDRx.op.take_last(-_stop))
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if _step > 1:
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pipeline.append(
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GDRx.filter_indexed(func(_x, i): return i % int(_step == 0))
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)
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elif _step < 0:
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ArgumentOutOfRangeError.raise()
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return source.pipe(GDRx.util.Iter(pipeline))
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return slice
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