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// 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) {

        if idx := strings.Index(tag, ","); idx != -1 {

                return tag[:idx], tagOptions(tag[idx+1:])

        }

        return tag, tagOptions("")

}

// Contains returns whether checks that 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

}