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unit grammar IRC::Client::Grammar;
token TOP { <message>+ <left-overs> }
token left-overs { \N* }
token SPACE { ' '+ }
token message { [':' <prefix> <SPACE> ]? <command> <params> \n }
token prefix {
[ <servername> || <nick> ['!' <user>]? ['@' <host>]? ]
<before <SPACE>>
}
token servername { <host> }
token nick {
# the RFC grammar states nicks have to start with a letter,
# however, modern server support and nick use disagrees with that
# and nicks can start with special chars too
[<letter> | <special>] [ <letter> | <number> | <special> ]*
}
token user { <-[\ \x[0]\r\n]>+? <before [<SPACE> | '@']>}
token host { <-[\s!@]>+ }
token command { <letter>+ | <number>**3 }
token params { <SPACE>* [ ':' <trailing> | <middle> <params> ]? }
token middle { <-[:\ \x[0]\r\n]> <-[\ \x[0]\r\n]>* }
token trailing { <-[\x[0]\r\n]>* }
token letter { <[a..zA..Z]> }
token number { <[0..9]> }
token special { <[-_\[\]\\`^{}]> }
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