mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-02 18:53:22 +00:00
46 lines
1.2 KiB
Go
46 lines
1.2 KiB
Go
// 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 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 = <any ASCII character> ; ( 0-177, 0.-127.)
|
|
// qtext = <any CHAR excepting <">, ; => may be folded
|
|
// "\" & CR, and including
|
|
// linear-white-space>
|
|
switch r {
|
|
case '"', '\\', '\r':
|
|
return false
|
|
}
|
|
return r < 0x80
|
|
}
|