diff options
Diffstat (limited to 'vendor/github.com/prometheus/common/model/labels.go')
| -rw-r--r-- | vendor/github.com/prometheus/common/model/labels.go | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/vendor/github.com/prometheus/common/model/labels.go b/vendor/github.com/prometheus/common/model/labels.go index 3317ce22f..73b7aa3e6 100644 --- a/vendor/github.com/prometheus/common/model/labels.go +++ b/vendor/github.com/prometheus/common/model/labels.go @@ -97,26 +97,35 @@ var LabelNameRE = regexp.MustCompile("^[a-zA-Z_][a-zA-Z0-9_]*$") // therewith. type LabelName string -// IsValid returns true iff name matches the pattern of LabelNameRE for legacy -// names, and iff it's valid UTF-8 if NameValidationScheme is set to -// UTF8Validation. For the legacy matching, it does not use LabelNameRE for the -// check but a much faster hardcoded implementation. +// IsValid returns true iff the name matches the pattern of LabelNameRE when +// NameValidationScheme is set to LegacyValidation, or valid UTF-8 if +// NameValidationScheme is set to UTF8Validation. func (ln LabelName) IsValid() bool { if len(ln) == 0 { return false } switch NameValidationScheme { case LegacyValidation: - for i, b := range ln { - if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || (b >= '0' && b <= '9' && i > 0)) { - return false - } - } + return ln.IsValidLegacy() case UTF8Validation: return utf8.ValidString(string(ln)) default: panic(fmt.Sprintf("Invalid name validation scheme requested: %d", NameValidationScheme)) } +} + +// IsValidLegacy returns true iff name matches the pattern of LabelNameRE for +// legacy names. It does not use LabelNameRE for the check but a much faster +// hardcoded implementation. +func (ln LabelName) IsValidLegacy() bool { + if len(ln) == 0 { + return false + } + for i, b := range ln { + if !((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z') || b == '_' || (b >= '0' && b <= '9' && i > 0)) { + return false + } + } return true } |