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// Copyright (c) 2019, Maxime Soulé
// All rights reserved.
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.
package util
import (
"errors"
"unicode"
)
// ErrTagEmpty is the error returned by [CheckTag] for an empty tag.
var ErrTagEmpty = errors.New("A tag cannot be empty")
// ErrTagInvalid is the error returned by [CheckTag] for an invalid tag.
var ErrTagInvalid = errors.New("Invalid tag, should match (Letter|_)(Letter|_|Number)*")
// CheckTag checks that tag is a valid tag (see operator [Tag]) or not.
//
// [Tag]: https://go-testdeep.zetta.rocks/operators/tag/
func CheckTag(tag string) error {
if tag == "" {
return ErrTagEmpty
}
for i, r := range tag {
if !(unicode.IsLetter(r) || r == '_' || (i > 0 && unicode.IsNumber(r))) {
return ErrTagInvalid
}
}
return nil
}
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