mirror of
https://github.com/duke-git/lancet.git
synced 2026-02-04 21:02:27 +08:00
feat: add OrderedMap for issue #237
This commit is contained in:
dudaodong
431
maputil/orderedmap.go
Normal file
431
maputil/orderedmap.go
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@@ -0,0 +1,431 @@
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package maputil
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import (
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"container/list"
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"encoding/json"
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"fmt"
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"reflect"
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"sort"
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"strconv"
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"sync"
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)
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// OrderedMap is a map that maintains the order of keys.
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type OrderedMap[K comparable, V any] struct {
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mu sync.RWMutex
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data map[K]V
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order *list.List
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index map[K]*list.Element
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}
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// NewOrderedMap creates a new OrderedMap.
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func NewOrderedMap[K comparable, V any]() *OrderedMap[K, V] {
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return &OrderedMap[K, V]{
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data: make(map[K]V),
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order: list.New(),
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index: make(map[K]*list.Element),
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}
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}
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// Get returns the value for the given key.
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// Play: todo
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func (om *OrderedMap[K, V]) Set(key K, value V) {
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om.mu.Lock()
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defer om.mu.Unlock()
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if elem, ok := om.index[key]; ok {
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elem.Value = value
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om.order.MoveToBack(elem)
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return
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}
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om.data[key] = value
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elem := om.order.PushBack(key)
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om.index[key] = elem
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}
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// Get returns the value for the given key.
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// Play: todo
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func (om *OrderedMap[K, V]) Get(key K) (V, bool) {
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om.mu.RLock()
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defer om.mu.RUnlock()
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value, ok := om.data[key]
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return value, ok
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}
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// Delete deletes the given key.
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// Play: todo
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func (om *OrderedMap[K, V]) Delete(key K) {
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om.mu.Lock()
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defer om.mu.Unlock()
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if elem, ok := om.index[key]; ok {
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om.order.Remove(elem)
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delete(om.data, key)
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delete(om.index, key)
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}
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}
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// Clear clears the map.
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// Play: todo
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func (om *OrderedMap[K, V]) Clear() {
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om.mu.Lock()
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defer om.mu.Unlock()
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om.data = make(map[K]V)
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om.order.Init()
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om.index = make(map[K]*list.Element)
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}
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// Front returns the first key-value pair.
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// Play: todo
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func (om *OrderedMap[K, V]) Front() (struct {
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Key K
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Value V
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}, bool) {
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om.mu.RLock()
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defer om.mu.RUnlock()
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if elem := om.order.Front(); elem != nil {
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key := elem.Value.(K)
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value := om.data[key]
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return struct {
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Key K
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Value V
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}{
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Key: key,
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Value: value,
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}, true
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}
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return struct {
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Key K
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Value V
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}{}, false
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}
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// Back returns the last key-value pair.
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// Play: todo
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func (om *OrderedMap[K, V]) Back() (struct {
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Key K
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Value V
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}, bool) {
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om.mu.RLock()
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defer om.mu.RUnlock()
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if elem := om.order.Back(); elem != nil {
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key := elem.Value.(K)
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value := om.data[key]
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return struct {
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Key K
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Value V
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}{
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Key: key,
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Value: value,
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}, true
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}
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return struct {
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Key K
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Value V
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}{}, false
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}
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// Range calls the given function for each key-value pair.
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// Play: todo
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func (om *OrderedMap[K, V]) Range(iteratee func(key K, value V) bool) {
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om.mu.RLock()
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defer om.mu.RUnlock()
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for elem := om.order.Front(); elem != nil; elem = elem.Next() {
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key := elem.Value.(K)
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value := om.data[key]
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if !iteratee(key, value) {
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break
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}
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}
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}
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// Keys returns the keys in order.
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// Play: todo
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func (om *OrderedMap[K, V]) Keys() []K {
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om.mu.RLock()
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defer om.mu.RUnlock()
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keys := make([]K, 0, len(om.data))
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for elem := om.order.Front(); elem != nil; elem = elem.Next() {
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keys = append(keys, elem.Value.(K))
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}
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return keys
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}
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// Values returns the values in order.
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// Play: todo
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func (om *OrderedMap[K, V]) Values() []V {
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om.mu.RLock()
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defer om.mu.RUnlock()
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values := make([]V, 0, len(om.data))
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for elem := om.order.Front(); elem != nil; elem = elem.Next() {
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key := elem.Value.(K)
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values = append(values, om.data[key])
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}
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return values
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}
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// Len returns the number of key-value pairs.
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// Play: todo
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func (om *OrderedMap[K, V]) Len() int {
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om.mu.RLock()
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defer om.mu.RUnlock()
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return len(om.data)
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}
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// Contains returns true if the given key exists.
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// Play: todo
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func (om *OrderedMap[K, V]) Contains(key K) bool {
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om.mu.RLock()
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defer om.mu.RUnlock()
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_, ok := om.data[key]
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return ok
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}
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// Elements returns the key-value pairs in order.
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// Play: todo
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func (om *OrderedMap[K, V]) Elements() []struct {
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Key K
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Value V
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} {
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om.mu.RLock()
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defer om.mu.RUnlock()
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elements := make([]struct {
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Key K
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Value V
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}, 0, len(om.data))
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for elem := om.order.Front(); elem != nil; elem = elem.Next() {
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key := elem.Value.(K)
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value := om.data[key]
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elements = append(elements, struct {
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Key K
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Value V
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}{Key: key, Value: value})
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}
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return elements
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}
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// Iter returns a channel that yields key-value pairs in order.
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// Play: todo
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func (om *OrderedMap[K, V]) Iter() <-chan struct {
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Key K
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Value V
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} {
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ch := make(chan struct {
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Key K
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Value V
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})
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go func() {
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om.mu.RLock()
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defer om.mu.RUnlock()
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defer close(ch)
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for elem := om.order.Front(); elem != nil; elem = elem.Next() {
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key := elem.Value.(K)
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value := om.data[key]
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ch <- struct {
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Key K
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Value V
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}{Key: key, Value: value}
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}
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}()
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return ch
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}
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// ReverseIter returns a channel that yields key-value pairs in reverse order.
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// Play: todo
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func (om *OrderedMap[K, V]) ReverseIter() <-chan struct {
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Key K
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Value V
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} {
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ch := make(chan struct {
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Key K
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Value V
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})
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go func() {
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om.mu.RLock()
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defer om.mu.RUnlock()
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defer close(ch)
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for elem := om.order.Back(); elem != nil; elem = elem.Prev() {
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key := elem.Value.(K)
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value := om.data[key]
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ch <- struct {
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Key K
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Value V
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}{Key: key, Value: value}
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}
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}()
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return ch
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}
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// SortByValue sorts the map by key given less function.
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// Play: todo
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func (om *OrderedMap[K, V]) SortByKey(less func(a, b K) bool) {
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om.mu.Lock()
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defer om.mu.Unlock()
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keys := make([]K, 0, om.order.Len())
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for elem := om.order.Front(); elem != nil; elem = elem.Next() {
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keys = append(keys, elem.Value.(K))
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}
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sort.Slice(keys, func(i, j int) bool {
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return less(keys[i], keys[j])
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})
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om.order.Init()
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om.index = make(map[K]*list.Element)
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for _, key := range keys {
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elem := om.order.PushBack(key)
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om.index[key] = elem
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}
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}
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// MarshalJSON implements the json.Marshaler interface.
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// Play: todo
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func (om *OrderedMap[K, V]) MarshalJSON() ([]byte, error) {
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om.mu.RLock()
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defer om.mu.RUnlock()
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tempMap := make(map[string]V)
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for e := om.order.Front(); e != nil; e = e.Next() {
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key := e.Value.(K)
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keyStr, err := keyToString(key)
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if err != nil {
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return nil, err
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}
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tempMap[keyStr] = om.data[key]
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}
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return json.Marshal(tempMap)
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}
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// UnmarshalJSON implements the json.Unmarshaler interface.
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// Play: todo
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func (om *OrderedMap[K, V]) UnmarshalJSON(data []byte) error {
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om.mu.Lock()
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defer om.mu.Unlock()
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tempMap := make(map[string]V)
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if err := json.Unmarshal(data, &tempMap); err != nil {
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return err
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}
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om.data = make(map[K]V)
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om.order.Init()
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om.index = make(map[K]*list.Element)
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for keyStr, value := range tempMap {
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key, err := stringToKey[K](keyStr)
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if err != nil {
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return err
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}
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om.data[key] = value
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elem := om.order.PushBack(key)
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om.index[key] = elem
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}
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return nil
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}
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func keyToString[K any](key K) (string, error) {
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switch v := any(key).(type) {
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case int:
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return strconv.Itoa(v), nil
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case float64:
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return strconv.FormatFloat(v, 'f', -1, 64), nil
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case string:
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return v, nil
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default:
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// 使用反射将未知类型转换为字符串
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rv := reflect.ValueOf(key)
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switch rv.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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return strconv.FormatInt(rv.Int(), 10), nil
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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return strconv.FormatUint(rv.Uint(), 10), nil
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case reflect.Float32, reflect.Float64:
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return strconv.FormatFloat(rv.Float(), 'f', -1, 64), nil
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case reflect.String:
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return rv.String(), nil
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default:
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return "", fmt.Errorf("unsupported key type: %T", key)
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}
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}
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}
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func stringToKey[K any](s string) (K, error) {
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var zero K
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switch any(zero).(type) {
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case int:
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value, err := strconv.Atoi(s)
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return any(value).(K), err
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case float64:
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value, err := strconv.ParseFloat(s, 64)
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return any(value).(K), err
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case string:
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return any(s).(K), nil
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default:
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// 使用反射恢复未知类型的键
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rv := reflect.ValueOf(&zero).Elem()
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switch rv.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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val, err := strconv.ParseInt(s, 10, 64)
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if err != nil {
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return zero, err
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}
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rv.SetInt(val)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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val, err := strconv.ParseUint(s, 10, 64)
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if err != nil {
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return zero, err
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}
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rv.SetUint(val)
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case reflect.Float32, reflect.Float64:
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val, err := strconv.ParseFloat(s, 64)
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if err != nil {
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return zero, err
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}
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rv.SetFloat(val)
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case reflect.String:
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rv.SetString(s)
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default:
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return zero, fmt.Errorf("unsupported key type: %T", zero)
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}
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return rv.Interface().(K), nil
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}
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}
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245
maputil/orderedmap_test.go
Normal file
245
maputil/orderedmap_test.go
Normal file
@@ -0,0 +1,245 @@
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package maputil
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|
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import (
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"testing"
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"github.com/duke-git/lancet/v2/internal"
|
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)
|
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func TestOrderedMap_Set_Get(t *testing.T) {
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om := NewOrderedMap[string, int]()
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om.Set("a", 1)
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om.Set("b", 2)
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om.Set("c", 3)
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assert := internal.NewAssert(t, "TestOrderedMap_Set_Get")
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val, ok := om.Get("a")
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assert.Equal(1, val)
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assert.Equal(true, ok)
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val, ok = om.Get("d")
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assert.Equal(false, ok)
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assert.Equal(0, val)
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}
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func TestOrderedMap_Front_Back(t *testing.T) {
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om := NewOrderedMap[string, int]()
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om.Set("a", 1)
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om.Set("b", 2)
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om.Set("c", 3)
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assert := internal.NewAssert(t, "TestOrderedMap_Front_Back")
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frontElement, ok := om.Front()
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assert.Equal("a", frontElement.Key)
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assert.Equal(1, frontElement.Value)
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assert.Equal(true, ok)
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backElement, ok := om.Back()
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assert.Equal("c", backElement.Key)
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assert.Equal(3, backElement.Value)
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assert.Equal(true, ok)
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}
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func TestOrderedMap_Delete_Clear(t *testing.T) {
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om := NewOrderedMap[string, int]()
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om.Set("a", 1)
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om.Set("b", 2)
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om.Set("c", 3)
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assert := internal.NewAssert(t, "TestOrderedMap_Delete_Clear")
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assert.Equal(3, om.Len())
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om.Delete("b")
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assert.Equal(2, om.Len())
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om.Clear()
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assert.Equal(0, om.Len())
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}
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func TestOrderedMap_Keys_Values(t *testing.T) {
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om := NewOrderedMap[string, int]()
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om.Set("a", 1)
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om.Set("b", 2)
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om.Set("c", 3)
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assert := internal.NewAssert(t, "TestOrderedMap_Keys_Values")
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assert.Equal([]string{"a", "b", "c"}, om.Keys())
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assert.Equal([]int{1, 2, 3}, om.Values())
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}
|
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|
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func TestOrderedMap_Contains(t *testing.T) {
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om := NewOrderedMap[string, int]()
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om.Set("a", 1)
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om.Set("b", 2)
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om.Set("c", 3)
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assert := internal.NewAssert(t, "TestOrderedMap_Contains")
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assert.Equal(true, om.Contains("a"))
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assert.Equal(false, om.Contains("d"))
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}
|
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|
||||
func TestOrderedMap_Eelements(t *testing.T) {
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om := NewOrderedMap[string, int]()
|
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|
||||
om.Set("a", 1)
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om.Set("b", 2)
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om.Set("c", 3)
|
||||
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_Eelements")
|
||||
|
||||
elements := []struct {
|
||||
Key string
|
||||
Value int
|
||||
}{
|
||||
{"a", 1},
|
||||
{"b", 2},
|
||||
{"c", 3},
|
||||
}
|
||||
|
||||
assert.Equal(elements, om.Elements())
|
||||
}
|
||||
|
||||
func TestOrderedMap_Range(t *testing.T) {
|
||||
om := NewOrderedMap[string, int]()
|
||||
|
||||
om.Set("a", 1)
|
||||
om.Set("b", 2)
|
||||
om.Set("c", 3)
|
||||
om.Set("d", 4)
|
||||
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_Range")
|
||||
|
||||
var keys []string
|
||||
om.Range(func(key string, value int) bool {
|
||||
keys = append(keys, key)
|
||||
return key != "c"
|
||||
})
|
||||
|
||||
assert.Equal([]string{"a", "b", "c"}, keys)
|
||||
}
|
||||
|
||||
func TestOrderedMap_Iter(t *testing.T) {
|
||||
om := NewOrderedMap[string, int]()
|
||||
|
||||
om.Set("a", 1)
|
||||
om.Set("b", 2)
|
||||
om.Set("c", 3)
|
||||
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_Iter")
|
||||
|
||||
var items []struct {
|
||||
Key string
|
||||
Value int
|
||||
}
|
||||
|
||||
iterCh := om.Iter()
|
||||
|
||||
for item := range iterCh {
|
||||
items = append(items, item)
|
||||
}
|
||||
|
||||
expected := []struct {
|
||||
Key string
|
||||
Value int
|
||||
}{
|
||||
{"a", 1},
|
||||
{"b", 2},
|
||||
{"c", 3},
|
||||
}
|
||||
|
||||
assert.Equal(expected, items)
|
||||
}
|
||||
|
||||
func TestOrderedMap_ReverseIter(t *testing.T) {
|
||||
om := NewOrderedMap[string, int]()
|
||||
|
||||
om.Set("a", 1)
|
||||
om.Set("b", 2)
|
||||
om.Set("c", 3)
|
||||
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_ReverseIter")
|
||||
|
||||
var items []struct {
|
||||
Key string
|
||||
Value int
|
||||
}
|
||||
|
||||
iterCh := om.ReverseIter()
|
||||
|
||||
for item := range iterCh {
|
||||
items = append(items, item)
|
||||
}
|
||||
|
||||
expected := []struct {
|
||||
Key string
|
||||
Value int
|
||||
}{
|
||||
{"c", 3},
|
||||
{"b", 2},
|
||||
{"a", 1},
|
||||
}
|
||||
|
||||
assert.Equal(expected, items)
|
||||
}
|
||||
|
||||
func TestOrderedMap_SortByKey(t *testing.T) {
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_SortByKey")
|
||||
|
||||
om := NewOrderedMap[string, int]()
|
||||
|
||||
om.Set("d", 4)
|
||||
om.Set("b", 2)
|
||||
om.Set("c", 3)
|
||||
om.Set("a", 1)
|
||||
|
||||
om.SortByKey(func(a, b string) bool {
|
||||
return a < b
|
||||
})
|
||||
|
||||
assert.Equal([]string{"a", "b", "c", "d"}, om.Keys())
|
||||
}
|
||||
|
||||
func TestOrderedMap_MarshalJSON(t *testing.T) {
|
||||
om := NewOrderedMap[string, int]()
|
||||
|
||||
om.Set("a", 1)
|
||||
om.Set("b", 2)
|
||||
om.Set("c", 3)
|
||||
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_MarshalJSON")
|
||||
|
||||
jsonBytes, err := om.MarshalJSON()
|
||||
|
||||
if err != nil {
|
||||
t.Errorf("MarshalJSON error: %v", err)
|
||||
}
|
||||
|
||||
assert.Equal(`{"a":1,"b":2,"c":3}`, string(jsonBytes))
|
||||
}
|
||||
|
||||
func TestOrderedMap_UnmarshalJSON(t *testing.T) {
|
||||
assert := internal.NewAssert(t, "TestOrderedMap_UnmarshalJSON")
|
||||
|
||||
jsonStr := `{"a":1,"b":2,"c":3}`
|
||||
|
||||
om := NewOrderedMap[string, int]()
|
||||
err := om.UnmarshalJSON([]byte(jsonStr))
|
||||
if err != nil {
|
||||
t.Errorf("MarshalJSON error: %v", err)
|
||||
}
|
||||
|
||||
assert.Equal(3, om.Len())
|
||||
assert.Equal(true, om.Contains("a"))
|
||||
assert.Equal(true, om.Contains("b"))
|
||||
assert.Equal(true, om.Contains("c"))
|
||||
}
|
||||
Reference in New Issue
Block a user