// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package mime
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import (
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"strings"
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)
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// isTSpecial reports whether rune is in 'tspecials' as defined by RFC
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// 1521 and RFC 2045.
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func isTSpecial(r rune) bool {
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return strings.ContainsRune(`()<>@,;:\"/[]?=`, r)
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}
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// isTokenChar reports whether rune is in 'token' as defined by RFC
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// 1521 and RFC 2045.
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func isTokenChar(r rune) bool {
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// token := 1*<any (US-ASCII) CHAR except SPACE, CTLs,
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// or tspecials>
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return r > 0x20 && r < 0x7f && !isTSpecial(r)
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}
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// isToken reports whether s is a 'token' as defined by RFC 1521
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// and RFC 2045.
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func isToken(s string) bool {
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if s == "" {
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return false
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}
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return strings.IndexFunc(s, isNotTokenChar) < 0
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}
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