blob: 09e941e3ec0ddbf17c1929e6ce74770fc1123ef9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
// 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
}
// 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
}
|
