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valuer.go
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valuer.go
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package meta
import (
"fmt"
"strings"
)
// Valuer for meta.
type Valuer interface {
Value() string
fmt.Stringer
}
// ValueOrBlank for meta.
func ValueOrBlank(s Valuer) string {
if s == nil {
return ""
}
return s.Value()
}
// IsBlank checks for an empty string.
func IsBlank(actual Valuer) bool {
return IsEqual(actual, "")
}
// IsEqual checks if actual is expected.
func IsEqual(actual Valuer, expected string) bool {
return ValueOrBlank(actual) == expected
}
// Error for meta.
func Error(err error) Valuer {
if err == nil {
return String("")
}
return String(err.Error())
}
// ToString for meta.
func ToString(st fmt.Stringer) String {
if st == nil {
return String("")
}
return String(st.String())
}
// String for meta.
type String string
// Value of the string.
func (v String) Value() string {
return string(v)
}
// String to satisfy fmt.Stringer.
func (v String) String() string {
return v.Value()
}
// ToRedacted for meta.
func ToRedacted(st fmt.Stringer) Redacted {
if st == nil {
return Redacted("")
}
return Redacted(st.String())
}
// Redacted for meta.
type Redacted string
// Value of the string.
func (v Redacted) Value() string {
return string(v)
}
// String to satisfy fmt.Stringer.
func (v Redacted) String() string {
return strings.Repeat("*", len(v.Value()))
}