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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package containers
import (
"errors"
)
type orderedKV[K Ordered[K], V any] struct {
K K
V V
}
type SortedMap[K Ordered[K], V any] struct {
inner RBTree[K, orderedKV[K, V]]
}
func (m *SortedMap[K, V]) init() {
if m.inner.KeyFn == nil {
m.inner.KeyFn = m.keyFn
}
}
func (m *SortedMap[K, V]) keyFn(kv orderedKV[K, V]) K {
return kv.K
}
func (m *SortedMap[K, V]) Delete(key K) {
m.init()
m.inner.Delete(key)
}
func (m *SortedMap[K, V]) Load(key K) (value V, ok bool) {
m.init()
node := m.inner.Lookup(key)
if node == nil {
var zero V
return zero, false
}
return node.Value.V, true
}
var errStop = errors.New("stop")
func (m *SortedMap[K, V]) Range(f func(key K, value V) bool) {
m.init()
_ = m.inner.Walk(func(node *RBNode[orderedKV[K, V]]) error {
if f(node.Value.K, node.Value.V) {
return nil
} else {
return errStop
}
})
}
func (m *SortedMap[K, V]) Subrange(rangeFn func(K, V) int, handleFn func(K, V) bool) {
m.init()
kvs := m.inner.SearchRange(func(kv orderedKV[K, V]) int {
return rangeFn(kv.K, kv.V)
})
for _, kv := range kvs {
if !handleFn(kv.K, kv.V) {
break
}
}
}
func (m *SortedMap[K, V]) Store(key K, value V) {
m.init()
m.inner.Insert(orderedKV[K, V]{
K: key,
V: value,
})
}
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