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strings.go
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strings.go
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// Copyright (c) 2012-2014 Jeremy Latt
// Copyright (c) 2014-2015 Edmund Huber
// Copyright (c) 2016- Daniel Oaks <daniel@danieloaks.net>
// released under the MIT license
package irc
import (
"regexp"
"strings"
"golang.org/x/text/unicode/norm"
)
var (
// regexps
// these get replaced with real regexes at server load time
ChannelNameExpr = regexp.MustCompile("^$")
NicknameExpr = regexp.MustCompile("^$")
)
// Names are normalized and canonicalized to remove formatting marks
// and simplify usage. They are things like hostnames and usermasks.
type Name string
func NewName(str string) Name {
return Name(norm.NFKC.String(str))
}
func NewNames(strs []string) []Name {
names := make([]Name, len(strs))
for index, str := range strs {
names[index] = NewName(str)
}
return names
}
// tests
func (name Name) IsChannel() bool {
return ChannelNameExpr.MatchString(name.String())
}
func (name Name) IsNickname() bool {
namestr := name.String()
// * is used for unregistered clients
// * is used for mask matching
// ? is used for mask matching
// . is used to denote server names
// , is used as a separator by the protocol
// ! separates username from nickname
// @ separates nick+user from hostname
// # is a channel prefix
// ~&@%+ are channel membership prefixes
// - is typically disallowed from first char of nicknames
// nicknames can't start with digits
if strings.Contains(namestr, "*") || strings.Contains(namestr, "?") ||
strings.Contains(namestr, ".") || strings.Contains(namestr, ",") ||
strings.Contains(namestr, "!") || strings.Contains(namestr, "@") ||
strings.Contains("#~&@%+-1234567890", string(namestr[0])) {
return false
}
// names that look like hostnames are restricted to servers, as with other ircds
if IsHostname(namestr) {
return false
}
return NicknameExpr.MatchString(namestr)
}
// conversions
func (name Name) String() string {
return string(name)
}
func (name Name) ToLower() Name {
return Name(strings.ToLower(name.String()))
}
// It's safe to coerce a Name to Text. Name is a strict subset of Text.
func (name Name) Text() Text {
return Text(name)
}
// Text is PRIVMSG, NOTICE, or TOPIC data. It's canonicalized UTF8
// data to simplify but keeps all formatting.
type Text string
func NewText(str string) Text {
return Text(norm.NFC.String(str))
}
func (text Text) String() string {
return string(text)
}