// 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 GO_LICENSE file.

package jsonpointer

import (

"strings"

"unicode"

)

// 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("")

}

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

}