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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*<any (US-ASCII) CHAR except SPACE, CTLs,
// or tspecials>
return r > 0x20 && r < 0x7f && !isTSpecial(r)
}
// isToken returns true if s is a 'token' as defined by RFC 1521
// and RFC 2045.
func isToken(s string) bool {
if s == "" {
return false
}
return strings.IndexFunc(s, isNotTokenChar) < 0
}
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