func ExampleGetFieldTag() {
s := MyStruct{}
tag, err := reflections.GetFieldTag(s, "FirstField", "matched")
if err != nil {
log.Fatal(err)
}
fmt.Println(tag)
tag, err = reflections.GetFieldTag(s, "ThirdField", "unmatched")
if err != nil {
log.Fatal(err)
}
fmt.Println(tag)
}
func formTagFromField(fieldName string, target interface{}) (string, error) {
fieldKind, err := reflections.GetFieldKind(target, fieldName)
f, _ := reflections.GetField(target, fieldName)
fmt.Printf("Field %v\n", f)
if err != nil {
return "", err
}
choices, _ := reflections.GetFieldTag(target, fieldName, "choices")
switch fieldKind {
case reflect.String:
if choices != "" {
return "list", nil
}
return "input", nil
case reflect.Slice:
return "checkbox", nil
case reflect.Bool:
return "confirm", nil
}
return "", nil
}
func reflectField(fieldName string, target interface{}) (Field, error) {
formTag, err := reflections.GetFieldTag(target, fieldName, "form")
if err != nil {
return nil, err
}
if formTag == "" {
s, e := formTagFromField(fieldName, target)
if e != nil || s == "" {
return nil, e
}
formTag = s
}
if !validFieldType(fieldName, target, formTag) {
return nil, fmt.Errorf("target field %s : %s", fieldName, formTag)
}
var message, choicesString string
var choices []string
message, err = reflections.GetFieldTag(target, fieldName, "message")
if err != nil {
return nil, err
}
if message == "" {
message = fieldName
}
choicesString, err = reflections.GetFieldTag(target, fieldName, "choices")
if err != nil {
return nil, err
}
if choicesString != "" {
choices = strings.Split(choicesString, ",")
for i, c := range choices {
choices[i] = strings.Trim(c, " ")
}
}
var field Field
switch formTag {
case "input":
field = &Input{
Name: fieldName,
Message: message,
}
case "confirm":
field = &Confirm{
Name: fieldName,
Message: message,
}
case "password":
field = &Password{
Name: fieldName,
Message: message,
}
case "list":
field = &List{
Name: fieldName,
Message: message,
Choices: choices,
}
case "checkbox":
field = &Checkbox{
Name: fieldName,
Message: message,
Choices: choices,
}
}
return field, nil
}