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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
// 1531 and RFC 2045.
func isTSpecial(rune int) bool {
return strings.IndexRune(`()<>@,;:\"/[]?=`, rune) != -1
}
// IsTokenChar returns true if rune is in 'token' as defined by RFC
// 1531 and RFC 2045.
func IsTokenChar(rune int) bool {
// token := 1*<any (US-ASCII) CHAR except SPACE, CTLs,
// or tspecials>
return rune > 0x20 && rune < 0x7f && !isTSpecial(rune)
}
// IsQText returns true if rune is in 'qtext' as defined by RFC 822.
func IsQText(rune int) bool {
// CHAR = <any ASCII character> ; ( 0-177, 0.-127.)
// qtext = <any CHAR excepting <">, ; => may be folded
// "\" & CR, and including
// linear-white-space>
switch rune {
case '"', '\\', '\r':
return false
}
return rune < 0x80
}
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