mirror of https://github.com/spf13/cast.git
Defaulted .ToStringE to use reflection to find a stringer element
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parent
0a58809502
commit
c0388c79a0
12
caste.go
12
caste.go
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@ -119,6 +119,11 @@ func ToIntE(i interface{}) (int, error) {
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}
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}
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}
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}
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var (
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errorType = reflect.TypeOf((*error)(nil)).Elem()
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fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
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)
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func ToStringE(i interface{}) (string, error) {
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func ToStringE(i interface{}) (string, error) {
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jww.DEBUG.Println("ToStringE called on type:", reflect.TypeOf(i))
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jww.DEBUG.Println("ToStringE called on type:", reflect.TypeOf(i))
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@ -136,7 +141,12 @@ func ToStringE(i interface{}) (string, error) {
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case nil:
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case nil:
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return "", nil
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return "", nil
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default:
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default:
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return "", fmt.Errorf("Unable to Cast %#v to string", i)
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// shamelessly borrowed from html/template
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v := reflect.ValueOf(i)
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for !v.Type().Implements(fmtStringerType) && !v.Type().Implements(errorType) && v.Kind() == reflect.Ptr && !v.IsNil() {
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v = v.Elem()
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}
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return fmt.Sprint(v), nil
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}
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}
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}
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}
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