1 /* 2 Copyright 2015 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 // Package slice provides utility methods for common operations on slices. 18 package slice 19 20 import ( 21 "sort" 22 ) 23 24 // CopyStrings copies the contents of the specified string slice 25 // into a new slice. 26 func CopyStrings(s []string) []string { 27 if s == nil { 28 return nil 29 } 30 c := make([]string, len(s)) 31 copy(c, s) 32 return c 33 } 34 35 // SortStrings sorts the specified string slice in place. It returns the same 36 // slice that was provided in order to facilitate method chaining. 37 func SortStrings(s []string) []string { 38 sort.Strings(s) 39 return s 40 } 41 42 // ContainsString checks if a given slice of strings contains the provided string. 43 // If a modifier func is provided, it is called with the slice item before the comparation. 44 func ContainsString(slice []string, s string, modifier func(s string) string) bool { 45 for _, item := range slice { 46 if item == s { 47 return true 48 } 49 if modifier != nil && modifier(item) == s { 50 return true 51 } 52 } 53 return false 54 } 55 56 // RemoveString returns a newly created []string that contains all items from slice that 57 // are not equal to s and modifier(s) in case modifier func is provided. 58 func RemoveString(slice []string, s string, modifier func(s string) string) []string { 59 newSlice := make([]string, 0) 60 for _, item := range slice { 61 if item == s { 62 continue 63 } 64 if modifier != nil && modifier(item) == s { 65 continue 66 } 67 newSlice = append(newSlice, item) 68 } 69 if len(newSlice) == 0 { 70 // Sanitize for unit tests so we don't need to distinguish empty array 71 // and nil. 72 newSlice = nil 73 } 74 return newSlice 75 } 76