Function appendStructFields

json/codec.go:550–740

(fields []structField, t reflect.Type, offset uintptr, seen map[reflect.Type]*structType, canAddr bool)

}

func appendStructFields(fields []structField, t reflect.Type, offset uintptr, seen map[reflect.Type]*structType, canAddr bool) []structField {
	type embeddedField struct {
		index      int
		offset     uintptr
		pointer    bool
		unexported bool
		subtype    *structType
		subfield   *structField
	}

	names := make(map[string]struct{})
	embedded := make([]embeddedField, 0, 10)

	for i := range t.NumField() {
		f := t.Field(i)

		var (
			name       = f.Name
			anonymous  = f.Anonymous
			tag        = false
			omitempty  = false
			stringify  = false
			unexported = len(f.PkgPath) != 0
		)

		if unexported && !anonymous { // unexported
			continue
		}

		if parts := strings.Split(f.Tag.Get("json"), ","); len(parts) != 0 {
			if len(parts[0]) != 0 {
				name, tag = parts[0], true
			}

			if name == "-" && len(parts) == 1 { // ignored
				continue
			}

			if !isValidTag(name) {
				name = f.Name
			}

			for _, tag := range parts[1:] {
				switch tag {
				case "omitempty":
					omitempty = true
				case "string":
					stringify = true
				}
			}
		}

		if anonymous && !tag { // embedded
			typ := f.Type
			ptr := f.Type.Kind() == reflect.Ptr

			if ptr {
				typ = f.Type.Elem()