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package reachability
import (
"errors"
"iter"
objectid "codeberg.org/lindenii/furgit/object/id"
)
// Seq returns the traversal sequence. It is single-use.
//
// Labels: Life-Parent.
func (walk *Walk) Seq() iter.Seq[objectid.ObjectID] {
if walk.seqUsed {
return func(yield func(objectid.ObjectID) bool) {
_ = yield
if walk.err == nil {
walk.err = errors.New("reachability: walk sequence already consumed")
}
}
}
walk.seqUsed = true
return func(yield func(objectid.ObjectID) bool) {
if walk.err != nil {
return
}
stack := walk.initialStack()
var err error
visited := make(map[objectid.ObjectID]struct{}, len(stack))
for len(stack) > 0 {
item := stack[len(stack)-1]
stack = stack[:len(stack)-1]
if _, ok := walk.haves[item.id]; ok {
continue
}
if _, ok := visited[item.id]; ok {
continue
}
visited[item.id] = struct{}{}
var next []walkItem
next, err = walk.expand(item)
if err != nil {
walk.err = err
return
}
if !yield(item.id) {
return
}
stack = append(stack, next...)
}
}
}
// Err returns the terminal error, if any, once Seq has been consumed.
func (walk *Walk) Err() error {
return walk.err
}
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