Source: tags.go in package encoding/json

Source File
	tags.go

Belonging Package
	encoding/json


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) {
	if idx := strings.Index(tag, ","); idx != -1 {
		return tag[:idx], tagOptions(tag[idx+1:])
	}
	return tag, tagOptions("")
}

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 next string
		i := strings.Index(s, ",")
		if i >= 0 {
			s, next = s[:i], s[i+1:]
		}
		if s == optionName {
			return true
		}
		s = next
	}
	return false


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