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// Copyright 2022 The Dawn Authors
//
// 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 container
import "sort"
// Set is a generic unordered set, which wrap's go's builtin 'map'.
// T is the set key, which must match the 'key' constraint.
type Set[T key] map[T]struct{}
// Returns a new set with the give items
func NewSet[T key](items ...T) Set[T] {
out := make(Set[T])
for _, item := range items {
out.Add(item)
}
return out
}
// Clone returns a new Set populated with s
func (s Set[T]) Clone() Set[T] {
out := make(Set[T], len(s))
for item := range s {
out.Add(item)
}
return out
}
// Add adds an item to the set.
func (s Set[T]) Add(item T) {
s[item] = struct{}{}
}
// AddAll adds all the items of o to the set.
func (s Set[T]) AddAll(o Set[T]) {
for item := range o {
s.Add(item)
}
}
// Remove removes an item from the set
func (s Set[T]) Remove(item T) {
delete(s, item)
}
// RemoveAll removes all the items of o from the set.
func (s Set[T]) RemoveAll(o Set[T]) {
for item := range o {
s.Remove(item)
}
}
// Contains returns true if the set contains the given item
func (s Set[T]) Contains(item T) bool {
_, found := s[item]
return found
}
// Contains returns true if the set contains all the items in o
func (s Set[T]) ContainsAll(o Set[T]) bool {
for item := range o {
if !s.Contains(item) {
return false
}
}
return true
}
// Intersection returns true if the set contains all the items in o
func (s Set[T]) Intersection(o Set[T]) Set[T] {
out := NewSet[T]()
for item := range o {
if s.Contains(item) {
out.Add(item)
}
}
return out
}
// List returns the sorted entries of the set as a slice
func (s Set[T]) List() []T {
out := make([]T, 0, len(s))
for v := range s {
out = append(out, v)
}
sort.Slice(out, func(i, j int) bool { return out[i] < out[j] })
return out
}