github.com/sealerio/sealer@v0.11.1-0.20240507115618-f4f89c5853ae/build/kubefile/parser/flags.go (about) 1 // Copyright © 2022 Alibaba Group Holding Ltd. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package parser 16 17 import ( 18 "strings" 19 20 "github.com/pkg/errors" 21 ) 22 23 type listFlag struct { 24 flag string 25 items []string 26 } 27 28 // parse --key=[a,b,c] or --key=a,b,c or --key="[a, b, c]" 29 // to listFlag {flag: key, items:[a, b, c]} 30 func parseListFlag(str string) (listFlag, error) { 31 strs := strings.SplitN(strings.TrimLeft(str, "-"), "=", 2) 32 if len(strs) < 2 { 33 return listFlag{}, errors.New("flags should be like --flag=[value] or --flag=value") 34 } 35 key, values := strs[0], strs[1] 36 values = strings.TrimLeft(values, "\"[") 37 values = strings.TrimRight(values, "\"]") 38 items := strings.Split(values, ",") 39 if len(items) == 0 { 40 return listFlag{}, errors.Errorf("empty input for flag %s is illegal", key) 41 } 42 for i, item := range items { 43 items[i] = strings.TrimSpace(item) 44 } 45 46 return listFlag{ 47 flag: key, 48 items: items, 49 }, nil 50 }