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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| 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 | ||
| } |
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