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package logg
import (
"bytes"
"errors"
"strings"
)
// ErrInvalidLevel is returned if the severity level is invalid.
var ErrInvalidLevel = errors.New("invalid level")
// Level of severity.
type Level int
// Log levels.
const (
LevelInvalid Level = iota
LevelTrace
LevelDebug
LevelInfo
LevelWarn
LevelError
)
var levelNames = [...]string{
LevelTrace: "trace",
LevelDebug: "debug",
LevelInfo: "info",
LevelWarn: "warn",
LevelError: "error",
}
var levelStrings = map[string]Level{
"trace": LevelTrace,
"debug": LevelDebug,
"info": LevelInfo,
"warn": LevelWarn,
"warning": LevelWarn,
"error": LevelError,
}
// String implementation.
func (l Level) String() string {
return levelNames[l]
}
// MarshalJSON implementation.
func (l Level) MarshalJSON() ([]byte, error) {
return []byte(`"` + l.String() + `"`), nil
}
// UnmarshalJSON implementation.
func (l *Level) UnmarshalJSON(b []byte) error {
v, err := ParseLevel(string(bytes.Trim(b, `"`)))
if err != nil {
return err
}
*l = v
return nil
}
// ParseLevel parses level string.
func ParseLevel(s string) (Level, error) {
l, ok := levelStrings[strings.ToLower(s)]
if !ok {
return LevelInvalid, ErrInvalidLevel
}
return l, nil
}
// MustParseLevel parses level string or panics.
func MustParseLevel(s string) Level {
l, err := ParseLevel(s)
if err != nil {
panic("invalid log level")
}
return l
}
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