def ready.delta

mylsm-lsm-store@0.6.0.1 · src/scan/VisibleCursor.bend:348

import Base
import mylsm-lsm-store@0.6.0.1/src/ByteMemTable.bend as ByteMemTable
import mylsm-lsm-store@0.6.0.1/src/scan/RangeCursor.bend as RangeCursor
import mylsm-lsm-store@0.6.0.1/src/scan/SstCursor.bend as SstCursor

348def ready.delta(
349  base: Maybe<&1, SstCursor.Cursor>,
350  pending: Maybe<&1, ByteMemTable.Entry>,
351  bounds: RangeCursor.Bounds,
352  head: DeltaHead
353) -> Step:
354  match base:
355    case Some{base_cursor}:
356      match pending:
357        case Some{base_entry}:
358          match head:
359            case DeltaDone{}:
360              Item{base_entry, Active{Some{base_cursor}, None{}, Nil{}, bounds, None{}}}
361            case DeltaReady{entry, tail}:
362              resolve(Some{base_cursor}, base_entry, entry, tail, bounds)
363        case None{}: End{}
364    case None{}:
365      match pending:
366        case None{}:
367          match head:
368            case DeltaDone{}: End{}
369            case DeltaReady{entry, tail}:
370              delta.output(entry, None{}, None{}, tail, bounds)
371        case Some{_}: End{}