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// Copyright 2015 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 precis
import (
// TODO: Add contextual character rules from Appendix A of RFC5892.
// A class is a set of characters that match certain derived properties. The
// PRECIS framework defines two classes: The Freeform class and the Identifier
// class. The freeform class should be used for profiles where expressiveness is
// prioritized over safety such as nicknames or passwords. The identifier class
// should be used for profiles where safety is the first priority such as
// addressable network labels and usernames.
type class struct {
validFrom property
// Contains satisfies the runes.Set interface and returns whether the given rune
// is a member of the class.
func (c class) Contains(r rune) bool {
b := make([]byte, 4)
n := utf8.EncodeRune(b, r)
trieval, _ := dpTrie.lookup(b[:n])
return c.validFrom <= property(trieval)
var (
identifier = &class{validFrom: pValid}
freeform = &class{validFrom: idDisOrFreePVal}