go grammar 源码
golang grammar 代码
文件路径：/src/mime/grammar.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 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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