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