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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 reports whether rune is in 'tspecials' as defined by RFC
- // 1521 and RFC 2045.
- func isTSpecial(r rune) bool {
- return strings.ContainsRune(`()<>@,;:\"/[]?=`, r)
- }
- // isTokenChar reports whether 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 reports whether 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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