restore v0.3.0

level/level.go

@@ -0,0 +1,73 @@
+package level
+
+import (
+	"encoding/json"
+	"strings"
+)
+
+//go:generate stringer -type=Level -linecomment
+
+var (
+	_ json.Marshaler   = Level(0)
+	_ json.Unmarshaler = (*Level)(nil)
+)
+
+// Level log.
+type Level uint32
+
+// available log levels.
+const (
+	Emergency Level = iota // emergency
+	Alert                  // alert
+	Critical               // critical
+	Error                  // error
+	Warning                // warning
+	Notice                 // notice
+	Info                   // info
+	Debug                  // debug
+)
+
+func (l Level) MarshalJSON() ([]byte, error) {
+	return json.Marshal(l.String())
+}
+
+func (l Level) Is(level Level) bool {
+	return level == l
+}
+
+func (l Level) Enabled(level Level) bool {
+	return l <= level
+}
+
+func (l *Level) UnmarshalJSON(in []byte) error {
+	var v string
+	if err := json.Unmarshal(in, &v); err != nil {
+		return err
+	}
+
+	lvl := Parse(v)
+	*l = lvl
+
+	return nil
+}
+
+func Parse(lvl string) Level {
+	switch strings.ToLower(lvl) {
+	case "debug", "Debug", "DEBUG":
+		return Debug
+	case "info", "Info", "INFO":
+		return Info
+	case "notice", "Notice", "NOTICE":
+		return Notice
+	case "warning", "Warning", "WARNING":
+		return Warning
+	case "error", "Error", "ERROR":
+		return Error
+	case "critical", "Critical", "CRITICAL":
+		return Critical
+	case "alert", "Alert", "ALERT":
+		return Alert
+	default:
+		return Emergency
+	}
+}