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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package set
import "slices"
// AnySet is a set stores any
type AnySet struct {
eq func(a any, b any) bool
slice []any
}
// NewAnySet builds a AnySet
func NewAnySet(eq func(a any, b any) bool, aa ...any) *AnySet {
slice := []any{}
out:
for _, a := range aa {
for _, b := range slice {
if eq(a, b) {
continue out
}
}
slice = append(slice, a)
}
return &AnySet{eq, slice}
}
// Exist checks whether `val` exists in `s`.
func (s *AnySet) Exist(val any) bool {
for _, a := range s.slice {
if s.eq(a, val) {
return true
}
}
return false
}
// Insert inserts `val` into `s`.
func (s *AnySet) Insert(val any) {
if !s.Exist(val) {
s.slice = append(s.slice, val)
}
}
// Intersection returns the intersection of two sets
func (s *AnySet) Intersection(rhs *AnySet) *AnySet {
newSet := NewAnySet(s.eq)
for elt := range rhs.slice {
if s.Exist(elt) {
newSet.Insert(elt)
}
}
return newSet
}
// Remove removes `val` from `s`
func (s *AnySet) Remove(val any) {
for i, a := range s.slice {
if s.eq(a, val) {
s.slice = slices.Delete(s.slice, i, i+1)
return
}
}
}
// Difference returns the difference of two sets
func (s *AnySet) Difference(rhs *AnySet) *AnySet {
newSet := NewAnySet(s.eq)
diffSet := NewAnySet(s.eq, rhs.slice...)
for elt := range s.slice {
if !diffSet.Exist(elt) {
newSet.Insert(elt)
}
}
return newSet
}
// Slice converts the set to a slice
func (s *AnySet) Slice() []any {
return slices.Clone(s.slice)
}
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