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  }