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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
}