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36 lines
1.1 KiB
36 lines
1.1 KiB
// 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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