func NewMapClaims() *MapClaims {
	return &MapClaims{MapClaims: jwtgo.MapClaims{}}
}

// Lookup returns the value and if the key is found.
func (c *MapClaims) Lookup(key string) (value string, ok bool) {
	if c == nil {
		return "", false
	}
	var vinterface interface{}
	vinterface, ok = c.MapClaims[key]
	if ok {
		value, ok = vinterface.(string)
	}
	return
}

// SetExpiry sets expiry in unix epoch secs

func (b *Boolean) Capture(values []string) error {
	*b = Boolean(strings.EqualFold(values[0], "true"))
	return nil
}

// LiteralString is a type for parsed SQL string literals
type LiteralString string

// Capture interface used by participle
func (ls *LiteralString) Capture(values []string) error {
	// Remove enclosing single quote
	n := len(values[0])
	r := values[0][1 : n-1]
	// Translate doubled quotes