Source: class.go in package golang.org/x/text/secure/precis

Source File
	class.go

Belonging Package
	golang.org/x/text/secure/precis


package precis

import (
	"unicode/utf8"
)

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}


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