golang tags 代码
文件路径：/src/encoding/json/tags.go
/ Copyright 2011 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package json
import (
"strings"
)
/ tagOptions is the string following a comma in a struct field's "json"
/ tag, or the empty string. It does not include the leading comma.
type tagOptions string
/ parseTag splits a struct field's json tag into its name and
/ comma-separated options.
func parseTag(tag string) (string, tagOptions) {
tag, opt, _ := strings.Cut(tag, ",")
return tag, tagOptions(opt)
}
/ Contains reports whether a comma-separated list of options
/ contains a particular substr flag. substr must be surrounded by a
/ string boundary or commas.
func (o tagOptions) Contains(optionName string) bool {
if len(o) == 0 {
return false
}
s := string(o)
for s != "" {
var name string
name, s, _ = strings.Cut(s, ",")
if name == optionName {
return true
}
}
return false
}