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- package runtime
- import (
- "reflect"
- "strings"
- "unicode"
- )
- func getTag(field reflect.StructField) string {
- return field.Tag.Get("json")
- }
- func IsIgnoredStructField(field reflect.StructField) bool {
- if field.PkgPath != "" {
- if field.Anonymous {
- t := field.Type
- if t.Kind() == reflect.Ptr {
- t = t.Elem()
- }
- if t.Kind() != reflect.Struct {
- return true
- }
- } else {
- // private field
- return true
- }
- }
- tag := getTag(field)
- return tag == "-"
- }
- type StructTag struct {
- Key string
- IsTaggedKey bool
- IsOmitEmpty bool
- IsString bool
- Field reflect.StructField
- }
- type StructTags []*StructTag
- func (t StructTags) ExistsKey(key string) bool {
- for _, tt := range t {
- if tt.Key == key {
- return true
- }
- }
- return false
- }
- func isValidTag(s string) bool {
- if s == "" {
- return false
- }
- for _, c := range s {
- switch {
- case strings.ContainsRune("!#$%&()*+-./:<=>?@[]^_{|}~ ", c):
- // Backslash and quote chars are reserved, but
- // otherwise any punctuation chars are allowed
- // in a tag name.
- case !unicode.IsLetter(c) && !unicode.IsDigit(c):
- return false
- }
- }
- return true
- }
- func StructTagFromField(field reflect.StructField) *StructTag {
- keyName := field.Name
- tag := getTag(field)
- st := &StructTag{Field: field}
- opts := strings.Split(tag, ",")
- if len(opts) > 0 {
- if opts[0] != "" && isValidTag(opts[0]) {
- keyName = opts[0]
- st.IsTaggedKey = true
- }
- }
- st.Key = keyName
- if len(opts) > 1 {
- for _, opt := range opts[1:] {
- switch opt {
- case "omitempty":
- st.IsOmitEmpty = true
- case "string":
- st.IsString = true
- }
- }
- }
- return st
- }
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