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// +build !go1.13
package errors
import (
"reflect"
)
type unwrapper interface {
Unwrap() error
}
// As assigns error or any wrapped error to the value target points
// to. If there is no value of the target type of target As returns
// false.
func As(err error, target interface{}) bool {
targetType := reflect.TypeOf(target)
for {
errType := reflect.TypeOf(err)
if errType == nil {
return false
}
if reflect.PtrTo(errType) == targetType {
reflect.ValueOf(target).Elem().Set(reflect.ValueOf(err))
return true
}
wrapped, ok := err.(unwrapper)
if ok {
err = wrapped.Unwrap()
} else {
return false
}
}
}
// Is detects whether the error is equal to a given error. Errors
// are considered equal by this function if they are the same object,
// or if they both contain the same error inside an errors.Error.
func Is(e error, original error) bool {
if e == original {
return true
}
if e, ok := e.(*Error); ok {
return Is(e.Err, original)
}
if original, ok := original.(*Error); ok {
return Is(e, original.Err)
}
return false
}
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