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package commitquery
import "codeberg.org/lindenii/furgit/internal/priorityqueue"
func (query *query) paintDownToCommon(left nodeIndex, rights []nodeIndex, minGeneration uint64) error {
query.beginMarkPhase()
query.setMarks(left, markLeft)
if len(rights) == 0 {
query.setMarks(left, markResult)
return nil
}
queue := priorityqueue.New(func(left, right nodeIndex) bool {
return query.compare(left, right) > 0
})
queue.Push(left)
for _, right := range rights {
query.setMarks(right, markRight)
queue.Push(right)
}
lastGeneration := generationInfinity
for queue.Len() > 0 {
idx, ok := queue.Pop()
if !ok {
break
}
if query.hasAnyMarks(idx, markStale) {
continue
}
generation := query.effectiveGeneration(idx)
if generation > lastGeneration {
return errBadGenerationOrder
}
lastGeneration = generation
if generation < minGeneration {
break
}
flags := query.marks(idx) & (markLeft | markRight | markStale)
if flags == (markLeft | markRight) {
query.setMarks(idx, markResult)
flags |= markStale
}
for _, parent := range query.parents(idx) {
if query.hasAllMarks(parent, flags) {
continue
}
query.setMarks(parent, flags)
queue.Push(parent)
}
}
return nil
}
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