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// Copyright 2010 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 mime

import (

        "strings"

)

// isTSpecial returns true if rune is in 'tspecials' as defined by RFC

// 1521 and RFC 2045.

func isTSpecial(r rune) bool {

        return strings.IndexRune(`()<>@,;:\"/[]?=`, r) != -1

}

// IsTokenChar returns true if rune is in 'token' as defined by RFC

// 1521 and RFC 2045.

func IsTokenChar(r rune) bool {

        // token := 1*

        //             or tspecials>

        return r > 0x20 && r < 0x7f && !isTSpecial(r)

}

// IsToken returns true if s is a 'token' as as defined by RFC 1521

// and RFC 2045.

func IsToken(s string) bool {

        if s == "" {

                return false

        }

        return strings.IndexFunc(s, isNotTokenChar) < 0

}

// IsQText returns true if rune is in 'qtext' as defined by RFC 822.

func IsQText(r int) bool {

        // CHAR        =          ; (  0-177,  0.-127.)

        // qtext       =  ,     ; => may be folded

        //                "\" & CR, and including

        //                linear-white-space>

        switch r {

        case '"', '\\', '\r':

                return false

        }

        return r < 0x80

}