VisibleStats.apply: def of mylsm-lsm-store@0.6.0.1
Import: import mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend as VisibleStats
Lines 35-50 of mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend: https://jend.leeeet.dev/read.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&start_line=35&end_line=50

import Base

# Applies the visible effect of one key's before and after states.
def apply(
  current: Stats,
  key_bytes: Nat,
  before: Maybe<&1, Nat>,
  after: Maybe<&1, Nat>
) -> Decision:
  match before:
    case None{}:
      match after:
        case None{}: unchanged(current)
        case Some{new_bytes}: added(current, key_bytes, new_bytes)
    case Some{old_bytes}:
      match after:
        case None{}: removed(current, key_bytes, old_bytes)
        case Some{new_bytes}: replaced(current, old_bytes, new_bytes)

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&name=Decision
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&name=Stats
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&name=added
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&name=removed
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&name=replaced
  https://jend.leeeet.dev/definition.txt?path=mylsm-lsm-store@0.6.0.1/src/scan/VisibleStats.bend&name=unchanged