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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package containers
import (
"fmt"
"io"
"sort"
"git.lukeshu.com/go/lowmemjson"
"git.lukeshu.com/btrfs-progs-ng/lib/maps"
)
// Set[T] is an unordered set of T.
type Set[T comparable] map[T]struct{}
var (
_ lowmemjson.Encodable = Set[int]{}
_ lowmemjson.Decodable = (*Set[int])(nil)
)
func cast[T any](x any) T { return x.(T) }
func (o Set[T]) EncodeJSON(w io.Writer) error {
var less func(a, b T) bool
var zero T
switch (any(zero)).(type) {
case _Ordered[T]:
less = func(a, b T) bool { return cast[_Ordered[T]](a).Cmp(b) < 0 }
// This is the constraints.Ordered list
case string:
less = func(a, b T) bool { return cast[string](a) < cast[string](b) }
case int:
less = func(a, b T) bool { return cast[int](a) < cast[int](b) }
case int8:
less = func(a, b T) bool { return cast[int8](a) < cast[int8](b) }
case int16:
less = func(a, b T) bool { return cast[int16](a) < cast[int16](b) }
case int32:
less = func(a, b T) bool { return cast[int32](a) < cast[int32](b) }
case int64:
less = func(a, b T) bool { return cast[int64](a) < cast[int64](b) }
case uint:
less = func(a, b T) bool { return cast[uint](a) < cast[uint](b) }
case uint8:
less = func(a, b T) bool { return cast[uint8](a) < cast[uint8](b) }
case uint16:
less = func(a, b T) bool { return cast[uint16](a) < cast[uint16](b) }
case uint32:
less = func(a, b T) bool { return cast[uint32](a) < cast[uint32](b) }
case uint64:
less = func(a, b T) bool { return cast[uint64](a) < cast[uint64](b) }
case uintptr:
less = func(a, b T) bool { return cast[uintptr](a) < cast[uintptr](b) }
case float32:
less = func(a, b T) bool { return cast[float32](a) < cast[float32](b) }
case float64:
less = func(a, b T) bool { return cast[float64](a) < cast[float64](b) }
default:
less = func(a, b T) bool { return fmt.Sprint(a) < fmt.Sprint(b) }
}
keys := maps.Keys(o)
sort.Slice(keys, func(i, j int) bool {
return less(keys[i], keys[j])
})
return lowmemjson.Encode(w, keys)
}
func (o *Set[T]) DecodeJSON(r io.RuneScanner) error {
c, _, _ := r.ReadRune()
if c == 'n' {
_, _, _ = r.ReadRune() // u
_, _, _ = r.ReadRune() // l
_, _, _ = r.ReadRune() // l
*o = nil
return nil
}
_ = r.UnreadRune()
*o = Set[T]{}
return lowmemjson.DecodeArray(r, func(r io.RuneScanner) error {
var val T
if err := lowmemjson.Decode(r, &val); err != nil {
return err
}
(*o)[val] = struct{}{}
return nil
})
}
func NewSet[T comparable](values ...T) Set[T] {
ret := make(Set[T], len(values))
for _, value := range values {
ret.Insert(value)
}
return ret
}
func (o Set[T]) Insert(v T) {
o[v] = struct{}{}
}
func (o Set[T]) InsertFrom(p Set[T]) {
for v := range p {
o[v] = struct{}{}
}
}
func (o Set[T]) Delete(v T) {
if o == nil {
return
}
delete(o, v)
}
func (o Set[T]) DeleteFrom(p Set[T]) {
if o == nil {
return
}
for v := range p {
delete(o, v)
}
}
func (o Set[T]) TakeOne() T {
for v := range o {
return v
}
var zero T
return zero
}
func (o Set[T]) Has(v T) bool {
_, has := o[v]
return has
}
func (small Set[T]) HasAny(big Set[T]) bool {
if len(big) < len(small) {
small, big = big, small
}
for v := range small {
if _, ok := big[v]; ok {
return true
}
}
return false
}
|
