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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package doctree
import (
"sync"
radix "github.com/armon/go-radix"
)
// Tree is a radix tree that holds T.
type Tree[T any] interface {
Get(s string) T
LongestPrefix(s string) (string, T)
Insert(s string, v T) T
WalkPrefix(lockType LockType, s string, f func(s string, v T) (bool, error)) error
}
// NewSimpleTree creates a new SimpleTree.
func NewSimpleTree[T comparable]() *SimpleTree[T] {
return &SimpleTree[T]{tree: radix.New()}
}
// SimpleTree is a thread safe radix tree that holds T.
type SimpleTree[T comparable] struct {
mu sync.RWMutex
tree *radix.Tree
zero T
}
func (tree *SimpleTree[T]) Get(s string) T {
tree.mu.RLock()
defer tree.mu.RUnlock()
if v, ok := tree.tree.Get(s); ok {
return v.(T)
}
return tree.zero
}
func (tree *SimpleTree[T]) LongestPrefix(s string) (string, T) {
tree.mu.RLock()
defer tree.mu.RUnlock()
if s, v, ok := tree.tree.LongestPrefix(s); ok {
return s, v.(T)
}
return "", tree.zero
}
func (tree *SimpleTree[T]) Insert(s string, v T) T {
tree.mu.Lock()
defer tree.mu.Unlock()
tree.tree.Insert(s, v)
return v
}
func (tree *SimpleTree[T]) Lock(lockType LockType) func() {
switch lockType {
case LockTypeNone:
return func() {}
case LockTypeRead:
tree.mu.RLock()
return tree.mu.RUnlock
case LockTypeWrite:
tree.mu.Lock()
return tree.mu.Unlock
}
return func() {}
}
func (tree *SimpleTree[T]) WalkPrefix(lockType LockType, s string, f func(s string, v T) (bool, error)) error {
commit := tree.Lock(lockType)
defer commit()
var err error
tree.tree.WalkPrefix(s, func(s string, v any) bool {
var b bool
b, err = f(s, v.(T))
if err != nil {
return true
}
return b
})
return err
}
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