forked from mirror/go-json
85 lines
1.6 KiB
Go
85 lines
1.6 KiB
Go
package json
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import (
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"reflect"
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"strings"
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"unicode"
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)
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func getTag(field reflect.StructField) string {
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return field.Tag.Get("json")
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}
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func isIgnoredStructField(field reflect.StructField) bool {
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if field.PkgPath != "" {
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if field.Anonymous {
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if !(field.Type.Kind() == reflect.Ptr && field.Type.Elem().Kind() == reflect.Struct) && field.Type.Kind() != reflect.Struct {
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return true
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}
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} else {
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// private field
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return true
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}
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}
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tag := getTag(field)
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if tag == "-" {
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return true
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}
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return false
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}
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type structTag struct {
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key string
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isTaggedKey bool
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isOmitEmpty bool
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isString bool
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field reflect.StructField
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}
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type structTags []*structTag
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func (t structTags) existsKey(key string) bool {
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for _, tt := range t {
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if tt.key == key {
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return true
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}
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}
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return false
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}
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func isValidTag(s string) bool {
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if s == "" {
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return false
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}
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for _, c := range s {
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switch {
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case strings.ContainsRune("!#$%&()*+-./:<=>?@[]^_{|}~ ", c):
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// Backslash and quote chars are reserved, but
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// otherwise any punctuation chars are allowed
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// in a tag name.
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case !unicode.IsLetter(c) && !unicode.IsDigit(c):
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return false
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}
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}
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return true
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}
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func structTagFromField(field reflect.StructField) *structTag {
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keyName := field.Name
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tag := getTag(field)
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st := &structTag{field: field}
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opts := strings.Split(tag, ",")
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if len(opts) > 0 {
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if opts[0] != "" && isValidTag(opts[0]) {
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keyName = opts[0]
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st.isTaggedKey = true
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}
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}
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st.key = keyName
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if len(opts) > 1 {
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st.isOmitEmpty = opts[1] == "omitempty"
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st.isString = opts[1] == "string"
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}
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return st
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}
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