62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
// written by Daniel Oaks <daniel@danieloaks.net>
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// released under the ISC license
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package ircmsg
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import (
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"errors"
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"strings"
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)
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var (
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MalformedNUH = errors.New("NUH is malformed")
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)
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// NUH holds a parsed name!user@host source ("prefix") of an IRC message.
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// The Name member will be either a nickname (in the case of a user-initiated
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// message) or a server name (in the case of a server-initiated numeric,
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// command, or NOTICE).
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type NUH struct {
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Name string
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User string
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Host string
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}
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// ParseNUH parses a NUH source of an IRC message into its constituent parts;
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// name (nickname or server name), username, and hostname.
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func ParseNUH(in string) (out NUH, err error) {
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if len(in) == 0 {
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return out, MalformedNUH
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}
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hostStart := strings.IndexByte(in, '@')
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if hostStart != -1 {
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out.Host = in[hostStart+1:]
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in = in[:hostStart]
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}
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userStart := strings.IndexByte(in, '!')
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if userStart != -1 {
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out.User = in[userStart+1:]
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in = in[:userStart]
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}
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out.Name = in
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return
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}
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// Canonical returns the canonical string representation of the NUH.
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func (nuh *NUH) Canonical() (result string) {
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var out strings.Builder
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out.Grow(len(nuh.Name) + len(nuh.User) + len(nuh.Host) + 2)
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out.WriteString(nuh.Name)
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if len(nuh.User) != 0 {
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out.WriteByte('!')
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out.WriteString(nuh.User)
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}
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if len(nuh.Host) != 0 {
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out.WriteByte('@')
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out.WriteString(nuh.Host)
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}
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return out.String()
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}
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