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query.go
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1790 lines (1743 loc) · 37.6 KB
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package linq
import (
"cmp"
"context"
"maps"
"slices"
"sync"
"unicode/utf8"
)
// From 从切片创建 Query 查询对象
func From[T comparable](source []T) Query[T] {
return Query[T]{
iterate: slices.Values(source),
fastSlice: source,
capacity: len(source),
}
}
// FromChannel 从只读 Channel 创建 Query 查询对象
func FromChannel[T comparable](source <-chan T) Query[T] {
return Query[T]{
iterate: func(yield func(T) bool) {
for item := range source {
if !yield(item) {
break
}
}
},
}
}
// FromString 从字符串创建 Query 查询对象,每个元素为一个 UTF-8 字符
func FromString(source string) Query[string] {
return Query[string]{
iterate: func(yield func(string) bool) {
pos := 0
length := len(source)
for pos < length {
r, w := utf8.DecodeRuneInString(source[pos:])
var item string
if r == utf8.RuneError && w == 1 {
item = string(r)
} else {
item = source[pos : pos+w]
}
pos += w
if !yield(item) {
break
}
}
},
capacity: len(source),
}
}
// FromMap 从 Map 创建 Query 查询对象,每个元素为 KV 键值对
func FromMap[K, V comparable](source map[K]V) Query[KV[K, V]] {
return Query[KV[K, V]]{
iterate: func(yield func(KV[K, V]) bool) {
for k, v := range maps.All(source) {
if !yield(KV[K, V]{Key: k, Value: v}) {
break
}
}
},
capacity: len(source),
}
}
// QueryEmpty 创建一个空的 Query 查询对象
func QueryEmpty[T comparable]() Query[T] {
return From([]T{})
}
// QueryRange 创建一个包含指定范围内整数序列的 Query 查询对象
func QueryRange(start, count int) Query[int] {
if count <= 0 {
return QueryEmpty[int]()
}
return Query[int]{
iterate: func(yield func(int) bool) {
end := start + count
for i := start; i < end; i++ {
if !yield(i) {
return
}
}
},
capacity: count,
}
}
// QueryRepeat 创建一个包含重复元素的 Query 查询对象
func QueryRepeat[T comparable](element T, count int) Query[T] {
if count <= 0 {
return QueryEmpty[T]()
}
return Query[T]{
iterate: func(yield func(T) bool) {
for i := 0; i < count; i++ {
if !yield(element) {
return
}
}
},
capacity: count,
}
}
// QueryMinBy 根据选择器返回的值计算最小值
func QueryMinBy[T comparable, V Integer | Float](q Query[T], selector func(T) V) (r V) {
first := true
for item := range q.iterate {
n := selector(item)
if first {
r = n
first = false
} else if n < r {
r = n
}
}
return
}
// QueryMaxBy 根据选择器返回的值计算最大值
func QueryMaxBy[T comparable, V Integer | Float](q Query[T], selector func(T) V) (r V) {
first := true
for item := range q.iterate {
n := selector(item)
if first {
r = n
first = false
} else if n > r {
r = n
}
}
return
}
// QuerySumBy 根据选择器返回的值计算总和
func QuerySumBy[T comparable, V Integer | Float | Complex](q Query[T], selector func(T) V) (r V) {
for item := range q.iterate {
r += selector(item)
}
return
}
// QueryAvgBy 计算平均值,兼容所有类型
func QueryAvgBy[T comparable, V Integer | Float](q Query[T], selector func(T) V) float64 {
var sum float64
var n int
for item := range q.iterate {
sum += float64(selector(item))
n++
}
if n == 0 {
return 0
}
return sum / float64(n)
}
// MinBy 根据选择器返回最小值
func MinBy[T comparable, R cmp.Ordered](q Query[T], selector func(T) R) T {
if q.fastSlice != nil {
var min T
var minR R
first := true
for _, v := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(v) {
continue
}
val := selector(v)
if first || cmp.Compare(val, minR) < 0 {
min = v
minR = val
first = false
}
}
return min
}
var min T
var minR R
first := true
for item := range q.iterate {
val := selector(item)
if first || cmp.Compare(val, minR) < 0 {
min = item
minR = val
first = false
}
}
return min
}
// MaxBy 根据选择器返回最大值
func MaxBy[T comparable, R cmp.Ordered](q Query[T], selector func(T) R) T {
if q.fastSlice != nil {
var max T
var maxR R
first := true
for _, v := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(v) {
continue
}
val := selector(v)
if first || cmp.Compare(val, maxR) > 0 {
max = v
maxR = val
first = false
}
}
return max
}
var max T
var maxR R
first := true
for item := range q.iterate {
val := selector(item)
if first || cmp.Compare(val, maxR) > 0 {
max = item
maxR = val
first = false
}
}
return max
}
// Sum 计算数值序列的和
func Sum[T Integer | Float | Complex](q Query[T]) T {
if q.fastSlice != nil {
var sum T
for _, v := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(v) {
continue
}
sum += v
}
return sum
}
var sum T
for item := range q.iterate {
sum += item
}
return sum
}
// SumBy 根据选择器获取成员和
func SumBy[T comparable, R Integer | Float | Complex](q Query[T], selector func(T) R) R {
if q.fastSlice != nil {
var sum R
for _, v := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(v) {
continue
}
sum += selector(v)
}
return sum
}
var sum R
for item := range q.iterate {
sum += selector(item)
}
return sum
}
// Average 计算数值序列的平均值(float64)
func Average[T Integer | Float](q Query[T]) float64 {
if q.fastSlice != nil {
var sum float64
count := 0
for _, v := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(v) {
continue
}
sum += float64(v)
count++
}
if count == 0 {
return 0
}
return sum / float64(count)
}
var sum float64
count := 0
for item := range q.iterate {
sum += float64(item)
count++
}
if count == 0 {
return 0
}
return sum / float64(count)
}
// AverageBy 根据选择器计算平均值
func AverageBy[T comparable, R Integer | Float](q Query[T], selector func(T) R) float64 {
if q.fastSlice != nil {
var sum float64
count := 0
for _, v := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(v) {
continue
}
sum += float64(selector(v))
count++
}
if count == 0 {
return 0
}
return sum / float64(count)
}
var sum float64
count := 0
for item := range q.iterate {
sum += float64(selector(item))
count++
}
if count == 0 {
return 0
}
return sum / float64(count)
}
// AvgBy 顶级函数别名
func AvgBy[T comparable, R Integer | Float](q Query[T], selector func(T) R) float64 {
return AverageBy(q, selector)
}
// Contains 判断序列中是否包含指定的元素
func Contains[T comparable](q Query[T], value T) bool {
return q.AnyWith(func(t T) bool { return t == value })
}
// IndexOf 返回元素的索引
func IndexOf[T comparable](q Query[T], value T) int {
index := 0
if q.fastSlice != nil {
for _, item := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(item) {
continue
}
if item == value {
return index
}
index++
}
} else {
for item := range q.iterate {
if item == value {
return index
}
index++
}
}
return -1
}
// LastIndexOf 返回元素最后出现的索引
func LastIndexOf[T comparable](q Query[T], value T) int {
index := 0
last := -1
if q.fastSlice != nil {
for _, item := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(item) {
continue
}
if item == value {
last = index
}
index++
}
} else {
for item := range q.iterate {
if item == value {
last = index
}
index++
}
}
return last
}
// Distinct 过滤掉重复的元素
func Distinct[T comparable](q Query[T]) Query[T] {
capHint := q.capacity/2 + 1
result := Query[T]{
iterate: func(yield func(T) bool) {
seen := make(map[T]struct{}, capHint)
if q.fastSlice != nil {
for _, item := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(item) {
continue
}
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
if !yield(item) {
return
}
}
}
return
}
for item := range q.iterate {
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
if !yield(item) {
return
}
}
}
},
capacity: q.capacity,
}
if q.fastSlice != nil && q.fastWhere == nil {
return result
}
result.materialize = func() []T {
items := make([]T, 0, capHint)
seen := make(map[T]struct{}, capHint)
if q.fastSlice != nil {
for _, item := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(item) {
continue
}
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
items = append(items, item)
}
}
return items
}
for item := range q.iterate {
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
items = append(items, item)
}
}
return items
}
return result
}
// DistinctBy 根据键选择器过滤重复元素
func DistinctBy[T, K comparable](q Query[T], selector func(T) K) Query[T] {
capHint := q.capacity/2 + 1
result := Query[T]{
iterate: func(yield func(T) bool) {
seen := make(map[K]struct{}, capHint)
if q.fastSlice != nil {
for _, item := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(item) {
continue
}
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
if !yield(item) {
return
}
}
}
return
}
for item := range q.iterate {
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
if !yield(item) {
return
}
}
}
},
capacity: q.capacity,
}
if q.fastSlice != nil && q.fastWhere == nil {
return result
}
result.materialize = func() []T {
items := make([]T, 0, capHint)
seen := make(map[K]struct{}, capHint)
if q.fastSlice != nil {
for _, item := range q.fastSlice {
if q.fastWhere != nil && !q.fastWhere(item) {
continue
}
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
items = append(items, item)
}
}
return items
}
for item := range q.iterate {
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
items = append(items, item)
}
}
return items
}
return result
}
// Intersect 获取两个序列的交集
func Intersect[T comparable](q1, q2 Query[T]) Query[T] {
capHint := q1.capacity
if capHint <= 0 || (q2.capacity > 0 && q2.capacity < capHint) {
capHint = q2.capacity
}
return Query[T]{
iterate: func(yield func(T) bool) {
// 0: 不存在 1: 存在于 q2 2: 已输出
seen := make(map[T]uint8, q2.capacity)
if q2.fastSlice != nil {
if q2.fastWhere == nil {
for _, item := range q2.fastSlice {
seen[item] = 1
}
} else {
where := q2.fastWhere
for _, item := range q2.fastSlice {
if !where(item) {
continue
}
seen[item] = 1
}
}
} else {
for item := range q2.iterate {
seen[item] = 1
}
}
if q1.fastSlice != nil {
if q1.fastWhere == nil {
for _, item := range q1.fastSlice {
if seen[item] == 1 {
seen[item] = 2
if !yield(item) {
return
}
}
}
} else {
where := q1.fastWhere
for _, item := range q1.fastSlice {
if !where(item) {
continue
}
if seen[item] == 1 {
seen[item] = 2
if !yield(item) {
return
}
}
}
}
return
}
for item := range q1.iterate {
if seen[item] == 1 {
seen[item] = 2
if !yield(item) {
return
}
}
}
},
capacity: capHint,
materialize: func() []T {
result := make([]T, 0, capHint)
seen := make(map[T]uint8, q2.capacity)
if q2.fastSlice != nil {
if q2.fastWhere == nil {
for _, item := range q2.fastSlice {
seen[item] = 1
}
} else {
where := q2.fastWhere
for _, item := range q2.fastSlice {
if !where(item) {
continue
}
seen[item] = 1
}
}
} else {
for item := range q2.iterate {
seen[item] = 1
}
}
if q1.fastSlice != nil {
if q1.fastWhere == nil {
for _, item := range q1.fastSlice {
if seen[item] == 1 {
seen[item] = 2
result = append(result, item)
}
}
} else {
where := q1.fastWhere
for _, item := range q1.fastSlice {
if !where(item) {
continue
}
if seen[item] == 1 {
seen[item] = 2
result = append(result, item)
}
}
}
return result
}
for item := range q1.iterate {
if seen[item] == 1 {
seen[item] = 2
result = append(result, item)
}
}
return result
},
}
}
// IntersectBy 根据键选择器获取两个序列的交集
func IntersectBy[T, K comparable](q1, q2 Query[T], selector func(T) K) Query[T] {
capHint := q1.capacity
if capHint <= 0 || (q2.capacity > 0 && q2.capacity < capHint) {
capHint = q2.capacity
}
return Query[T]{
iterate: func(yield func(T) bool) {
// 0: 不存在 1: 存在于 q2 2: 已输出
seen := make(map[K]uint8, q2.capacity)
if q2.fastSlice != nil {
for _, item := range q2.fastSlice {
if q2.fastWhere != nil && !q2.fastWhere(item) {
continue
}
seen[selector(item)] = 1
}
} else {
for item := range q2.iterate {
seen[selector(item)] = 1
}
}
if q1.fastSlice != nil {
for _, item := range q1.fastSlice {
if q1.fastWhere != nil && !q1.fastWhere(item) {
continue
}
key := selector(item)
if seen[key] == 1 {
seen[key] = 2
if !yield(item) {
return
}
}
}
return
}
for item := range q1.iterate {
key := selector(item)
if seen[key] == 1 {
seen[key] = 2
if !yield(item) {
return
}
}
}
},
capacity: capHint,
materialize: func() []T {
result := make([]T, 0, capHint)
seen := make(map[K]uint8, q2.capacity)
if q2.fastSlice != nil {
for _, item := range q2.fastSlice {
if q2.fastWhere != nil && !q2.fastWhere(item) {
continue
}
seen[selector(item)] = 1
}
} else {
for item := range q2.iterate {
seen[selector(item)] = 1
}
}
if q1.fastSlice != nil {
for _, item := range q1.fastSlice {
if q1.fastWhere != nil && !q1.fastWhere(item) {
continue
}
key := selector(item)
if seen[key] == 1 {
seen[key] = 2
result = append(result, item)
}
}
return result
}
for item := range q1.iterate {
key := selector(item)
if seen[key] == 1 {
seen[key] = 2
result = append(result, item)
}
}
return result
},
}
}
// Union 获取两个序列的并集
func Union[T comparable](q1, q2 Query[T]) Query[T] {
return Query[T]{
iterate: func(yield func(T) bool) {
seen := make(map[T]struct{}, q1.capacity+q2.capacity)
if q1.fastSlice != nil {
for _, item := range q1.fastSlice {
if q1.fastWhere != nil && !q1.fastWhere(item) {
continue
}
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
if !yield(item) {
return
}
}
}
} else {
for item := range q1.iterate {
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
if !yield(item) {
return
}
}
}
}
if q2.fastSlice != nil {
for _, item := range q2.fastSlice {
if q2.fastWhere != nil && !q2.fastWhere(item) {
continue
}
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
if !yield(item) {
return
}
}
}
return
}
for item := range q2.iterate {
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
if !yield(item) {
return
}
}
}
},
capacity: q1.capacity + q2.capacity,
materialize: func() []T {
result := make([]T, 0, q1.capacity+q2.capacity)
seen := make(map[T]struct{}, q1.capacity+q2.capacity)
if q1.fastSlice != nil {
for _, item := range q1.fastSlice {
if q1.fastWhere != nil && !q1.fastWhere(item) {
continue
}
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
result = append(result, item)
}
}
} else {
for item := range q1.iterate {
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
result = append(result, item)
}
}
}
if q2.fastSlice != nil {
for _, item := range q2.fastSlice {
if q2.fastWhere != nil && !q2.fastWhere(item) {
continue
}
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
result = append(result, item)
}
}
return result
}
for item := range q2.iterate {
if _, ok := seen[item]; !ok {
seen[item] = struct{}{}
result = append(result, item)
}
}
return result
},
}
}
// UnionBy 根据键选择器获取两个序列的并集
func UnionBy[T, K comparable](q1, q2 Query[T], selector func(T) K) Query[T] {
return Query[T]{
iterate: func(yield func(T) bool) {
seen := make(map[K]struct{}, q1.capacity+q2.capacity)
if q1.fastSlice != nil {
for _, item := range q1.fastSlice {
if q1.fastWhere != nil && !q1.fastWhere(item) {
continue
}
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
if !yield(item) {
return
}
}
}
} else {
for item := range q1.iterate {
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
if !yield(item) {
return
}
}
}
}
if q2.fastSlice != nil {
for _, item := range q2.fastSlice {
if q2.fastWhere != nil && !q2.fastWhere(item) {
continue
}
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
if !yield(item) {
return
}
}
}
} else {
for item := range q2.iterate {
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
if !yield(item) {
return
}
}
}
}
},
capacity: q1.capacity + q2.capacity,
materialize: func() []T {
result := make([]T, 0, q1.capacity+q2.capacity)
seen := make(map[K]struct{}, q1.capacity+q2.capacity)
if q1.fastSlice != nil {
for _, item := range q1.fastSlice {
if q1.fastWhere != nil && !q1.fastWhere(item) {
continue
}
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
result = append(result, item)
}
}
} else {
for item := range q1.iterate {
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
result = append(result, item)
}
}
}
if q2.fastSlice != nil {
for _, item := range q2.fastSlice {
if q2.fastWhere != nil && !q2.fastWhere(item) {
continue
}
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
result = append(result, item)
}
}
} else {
for item := range q2.iterate {
key := selector(item)
if _, ok := seen[key]; !ok {
seen[key] = struct{}{}
result = append(result, item)
}
}
}
return result
},
}
}
// Except 获取两个序列的差集 (q1 中有而 q2 中没有)
func Except[T comparable](q1, q2 Query[T]) Query[T] {
capHint := q2.capacity + q1.capacity/2 + 1
return Query[T]{
iterate: func(yield func(T) bool) {
// 0: 不存在 1: 存在于 q2 2: 已从 q1 输出
seen := make(map[T]uint8, capHint)
if q2.fastSlice != nil {
if q2.fastWhere == nil {
for _, item := range q2.fastSlice {
seen[item] = 1
}
} else {
where := q2.fastWhere
for _, item := range q2.fastSlice {
if !where(item) {
continue
}
seen[item] = 1
}
}
} else {
for item := range q2.iterate {
seen[item] = 1
}
}
if q1.fastSlice != nil {
if q1.fastWhere == nil {
for _, item := range q1.fastSlice {
if seen[item] == 0 {
seen[item] = 2
if !yield(item) {
return
}
}
}
} else {
where := q1.fastWhere
for _, item := range q1.fastSlice {
if !where(item) {
continue
}
if seen[item] == 0 {
seen[item] = 2
if !yield(item) {
return
}
}
}
}
return
}
for item := range q1.iterate {
if seen[item] == 0 {
seen[item] = 2
if !yield(item) {
return
}
}
}
},
capacity: q1.capacity,
materialize: func() []T {
result := make([]T, 0, q1.capacity)
seen := make(map[T]uint8, capHint)
if q2.fastSlice != nil {
if q2.fastWhere == nil {
for _, item := range q2.fastSlice {
seen[item] = 1
}
} else {
where := q2.fastWhere
for _, item := range q2.fastSlice {
if !where(item) {
continue
}
seen[item] = 1
}
}
} else {
for item := range q2.iterate {
seen[item] = 1
}
}
if q1.fastSlice != nil {
if q1.fastWhere == nil {