74 lines
1.7 KiB
Nim
74 lines
1.7 KiB
Nim
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# Nim-LibP2P
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# Copyright (c) 2022 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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# * MIT license ([LICENSE-MIT](LICENSE-MIT))
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# at your option.
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# This file may not be copied, modified, or distributed except according to
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# those terms.
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import sequtils
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type
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OffsettedSeq*[T] = object
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s*: seq[T]
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offset*: int
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proc initOffsettedSeq*[T](offset: int = 0): OffsettedSeq[T] =
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OffsettedSeq[T](s: newSeq[T](), offset: offset)
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proc all*[T](o: OffsettedSeq[T], pred: proc (x: T): bool): bool =
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o.s.all(pred)
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proc any*[T](o: OffsettedSeq[T], pred: proc (x: T): bool): bool =
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o.s.any(pred)
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proc apply*[T](o: OffsettedSeq[T], op: proc (x: T)) =
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o.s.apply(pred)
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proc apply*[T](o: OffsettedSeq[T], op: proc (x: T): T) =
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o.s.apply(pred)
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proc apply*[T](o: OffsettedSeq[T], op: proc (x: var T)) =
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o.s.apply(pred)
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func count*[T](o: OffsettedSeq[T], x: T): int =
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o.s.count(x)
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proc flushIf*[T](o: OffsettedSeq[T], pred: proc (x: T): bool) =
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var i = 0
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for e in o.s:
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if not pred(e): break
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i.inc()
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if i > 0:
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o.s.delete(0..<i)
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o.offset.inc(i)
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template flushIfIt*(o, pred: untyped) =
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var i = 0
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for it {.inject.} in o.s:
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if not pred: break
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i.inc()
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if i > 0:
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when (NimMajor, NimMinor) < (1, 4):
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o.s.delete(0, i - 1)
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else:
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o.s.delete(0..<i)
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o.offset.inc(i)
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proc add*[T](o: var OffsettedSeq[T], v: T) =
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o.s.add(v)
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proc `[]`*[T](o: var OffsettedSeq[T], index: int): var T =
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o.s[index - o.offset]
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iterator items*[T](o: OffsettedSeq[T]): T =
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for e in o.s:
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yield e
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proc high*[T](o: OffsettedSeq[T]): int =
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o.s.high + o.offset
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proc low*[T](o: OffsettedSeq[T]): int =
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o.s.low + o.offset
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