mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-26 01:02:07 +00:00
78 lines
2 KiB
Go
78 lines
2 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
|
|
//
|
|
// 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 predicate
|
|
|
|
// P is a predicate function that tests whether a value of type T satisfies some condition.
|
|
type P[T any] func(T) bool
|
|
|
|
// And returns a predicate that is a short-circuiting logical AND of this and the given predicates.
|
|
func (p P[T]) And(ps ...P[T]) P[T] {
|
|
return func(v T) bool {
|
|
for _, pp := range ps {
|
|
if !pp(v) {
|
|
return false
|
|
}
|
|
}
|
|
if p == nil {
|
|
return true
|
|
}
|
|
return p(v)
|
|
}
|
|
}
|
|
|
|
// Or returns a predicate that is a short-circuiting logical OR of this and the given predicates.
|
|
func (p P[T]) Or(ps ...P[T]) P[T] {
|
|
return func(v T) bool {
|
|
for _, pp := range ps {
|
|
if pp(v) {
|
|
return true
|
|
}
|
|
}
|
|
if p == nil {
|
|
return false
|
|
}
|
|
return p(v)
|
|
}
|
|
}
|
|
|
|
// Negate returns a predicate that is a logical negation of this predicate.
|
|
func (p P[T]) Negate() P[T] {
|
|
return func(v T) bool {
|
|
return !p(v)
|
|
}
|
|
}
|
|
|
|
// Filter returns a new slice holding only the elements of s that satisfy p.
|
|
// Filter modifies the contents of the slice s and returns the modified slice, which may have a smaller length.
|
|
func (p P[T]) Filter(s []T) []T {
|
|
var n int
|
|
for _, v := range s {
|
|
if p(v) {
|
|
s[n] = v
|
|
n++
|
|
}
|
|
}
|
|
return s[:n]
|
|
}
|
|
|
|
// FilterCopy returns a new slice holding only the elements of s that satisfy p.
|
|
func (p P[T]) FilterCopy(s []T) []T {
|
|
var result []T
|
|
for _, v := range s {
|
|
if p(v) {
|
|
result = append(result, v)
|
|
}
|
|
}
|
|
return result
|
|
}
|