mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-15 02:40:23 +00:00
83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
/*
|
|
Copyright 2021 The Kubernetes 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 slices defines various functions useful with slices of string type.
|
|
// The goal is to be as close as possible to
|
|
// https://github.com/golang/go/issues/45955. Ideal would be if we can just
|
|
// replace "stringslices" if the "slices" package becomes standard.
|
|
package slices
|
|
|
|
// Equal reports whether two slices are equal: the same length and all
|
|
// elements equal. If the lengths are different, Equal returns false.
|
|
// Otherwise, the elements are compared in index order, and the
|
|
// comparison stops at the first unequal pair.
|
|
func Equal(s1, s2 []string) bool {
|
|
if len(s1) != len(s2) {
|
|
return false
|
|
}
|
|
for i, n := range s1 {
|
|
if n != s2[i] {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Filter appends to d each element e of s for which keep(e) returns true.
|
|
// It returns the modified d. d may be s[:0], in which case the kept
|
|
// elements will be stored in the same slice.
|
|
// if the slices overlap in some other way, the results are unspecified.
|
|
// To create a new slice with the filtered results, pass nil for d.
|
|
func Filter(d, s []string, keep func(string) bool) []string {
|
|
for _, n := range s {
|
|
if keep(n) {
|
|
d = append(d, n)
|
|
}
|
|
}
|
|
return d
|
|
}
|
|
|
|
// Contains reports whether v is present in s.
|
|
func Contains(s []string, v string) bool {
|
|
return Index(s, v) >= 0
|
|
}
|
|
|
|
// Index returns the index of the first occurrence of v in s, or -1 if
|
|
// not present.
|
|
func Index(s []string, v string) int {
|
|
// "Contains" may be replaced with "Index(s, v) >= 0":
|
|
// https://github.com/golang/go/issues/45955#issuecomment-873377947
|
|
for i, n := range s {
|
|
if n == v {
|
|
return i
|
|
}
|
|
}
|
|
return -1
|
|
}
|
|
|
|
// Functions below are not in https://github.com/golang/go/issues/45955
|
|
|
|
// Clone returns a new clone of s.
|
|
func Clone(s []string) []string {
|
|
// https://github.com/go101/go101/wiki/There-is-not-a-perfect-way-to-clone-slices-in-Go
|
|
if s == nil {
|
|
return nil
|
|
}
|
|
c := make([]string, len(s))
|
|
copy(c, s)
|
|
return c
|
|
}
|