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// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
package utils
import (
"fmt"
)
var _ = fmt.Print
func Keys[M ~map[K]V, K comparable, V any](m M) []K {
r := make([]K, 0, len(m))
for k := range m {
r = append(r, k)
}
return r
}
func Values[M ~map[K]V, K comparable, V any](m M) []V {
r := make([]V, 0, len(m))
for _, k := range m {
r = append(r, k)
}
return r
}
type Set[T comparable] struct {
items map[T]struct{}
}
func (self *Set[T]) Add(val T) {
self.items[val] = struct{}{}
}
func (self *Set[T]) AddItems(val ...T) {
for _, x := range val {
self.items[x] = struct{}{}
}
}
func (self *Set[T]) String() string {
return fmt.Sprintf("%#v", Keys(self.items))
}
func (self *Set[T]) Remove(val T) {
delete(self.items, val)
}
func (self *Set[T]) Discard(val T) {
delete(self.items, val)
}
func (self *Set[T]) Has(val T) bool {
_, ok := self.items[val]
return ok
}
func (self *Set[T]) Clear() {
clear(self.items)
}
func (self *Set[T]) Len() int {
return len(self.items)
}
func (self *Set[T]) ForEach(f func(T)) {
for x := range self.items {
f(x)
}
}
func (self *Set[T]) Iterable() map[T]struct{} {
return self.items
}
func (self *Set[T]) Any() T {
for x := range self.items {
return x
}
panic("set is empty")
}
func (self *Set[T]) AsSlice() []T {
return Keys(self.items)
}
func (self *Set[T]) Intersect(other *Set[T]) (ans *Set[T]) {
if other == nil {
return NewSet[T]()
}
if self.Len() < other.Len() {
ans = NewSet[T](self.Len())
for x := range self.items {
if _, ok := other.items[x]; ok {
ans.items[x] = struct{}{}
}
}
} else {
ans = NewSet[T](other.Len())
for x := range other.items {
if _, ok := self.items[x]; ok {
ans.items[x] = struct{}{}
}
}
}
return
}
func (self *Set[T]) Subtract(other *Set[T]) (ans *Set[T]) {
ans = NewSet[T](self.Len())
for x := range self.items {
if other == nil || !other.Has(x) {
ans.items[x] = struct{}{}
}
}
return ans
}
func (self *Set[T]) IsSubsetOf(other *Set[T]) bool {
if other == nil {
return self.Len() == 0
}
for x := range self.items {
if !other.Has(x) {
return false
}
}
return true
}
func (self *Set[T]) Equal(other *Set[T]) bool {
l := self.Len()
if other == nil {
return l == 0
}
if l != other.Len() {
return false
}
for x := range self.items {
if !other.Has(x) {
return false
}
}
return true
}
func NewSet[T comparable](capacity ...int) (ans *Set[T]) {
if len(capacity) == 0 {
ans = &Set[T]{items: make(map[T]struct{}, 8)}
} else {
ans = &Set[T]{items: make(map[T]struct{}, capacity[0])}
}
return
}
func NewSetWithItems[T comparable](items ...T) (ans *Set[T]) {
ans = NewSet[T](len(items))
ans.AddItems(items...)
return ans
}
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