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Source file src/mime/grammar.go

Documentation: mime

  // 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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