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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package ellipses
import (
"errors"
"fmt"
"regexp"
"strings"
)
var (
// Regex to extract ellipses syntax inputs.
regexpList = regexp.MustCompile(`(.*)({[0-9a-z]+[,[0-9a-z]+]?})(.*)`)
// Ellipses constants
comma = ","
)
// HasList - returns true if input arg has list type pattern {1,3,5}
func HasList(args ...string) bool {
ok := len(args) > 0
for _, arg := range args {
if !ok {
break
}
ok = ok && regexpList.MatchString(arg)
}
return ok
}
// ErrInvalidListFormatFn error returned when invalid list format is detected.
var ErrInvalidListFormatFn = func(arg string) error {
return fmt.Errorf("Invalid list format in (%s)", arg)
}
// FindListPatterns - finds all list patterns, recursively and parses the ranges numerically.
func FindListPatterns(arg string) (ArgPattern, error) {
v, err := findPatterns(arg, regexpList, parseListRange)
if err == errFormat {
err = ErrInvalidListFormatFn(arg)
}
return v, err
}
// Parses a list pattern of following style `{1,3,4}`
func parseListRange(pattern string) (seq []string, err error) {
if !strings.HasPrefix(pattern, openBraces) {
return nil, errors.New("invalid argument")
}
if !strings.HasSuffix(pattern, closeBraces) {
return nil, errors.New("invalid argument")
}
pattern = strings.TrimPrefix(pattern, openBraces)
pattern = strings.TrimSuffix(pattern, closeBraces)
seq = strings.Split(pattern, comma)
if len(seq) < 2 {
return nil, errors.New("invalid argument")
}
for i := range seq {
if len(seq[i]) == 0 {
return nil, errors.New("invalid argument")
}
}
return seq, nil
}
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