s ::= ws grammar ws => "gram" ws !::= w** grammar ::= r +/ ws => "grammar" r ::= word ^"::=" alternatives /ws | word ^"!::=" alternatives /ws alternatives ::= equiAlt +/ (ws ">" ws) equiAlt ::= conjuncts +/ (ws "|" ws) sequence ::= es > es ws ^"/" e es ::= e */ (w**) ss ::= es | es ^"/" e /ws conjuncts ::= rewrite | rewrite ^"&" e*/ws /ws | rewrite ^"&~" e*/ws /ws rewrite ::= sequence /ws => "rewrite" | sequence ^"=>" word /ws | sequence ^"=>" quoted /ws | sequence "=>" "()" /ws => "wrap" ec ::= [~\-\]\\\~] | escaped range ::= ec => "range" | ec ^"-" ec e ::= word => "nonTerminal" | [(][)] => "epsilon" | ^"{" alternatives "}" /ws | ^"[" (range*) "]" | ^"[~" (range*) "]" | ^"^" quoted /ws | e ^"~/~" /ws | ^"!" e /ws | ^"`" e /ws | e ^"#" /ws | (e ws ^"**" > e ws ^"*") | e ^"*/" e /ws | (e ws ^"++" > e ws ^"+") | e ^"+/" e /ws | e ^"?" /ws | quoted => "literal" | "(" word ^")" /ws > ^"(" alternatives ")" /ws w !::= " " | "//" ([~\n]*) "\n" | "\n" | "\r" an ::= [a-zA-Z0-9_] word ::= an++ quoted ::= "\"" (([~\"\\] | escaped)+) "\"" | "\"\"" => "" escaped ::= "\\n" => "\n" | "\\r" => "\r" | "\\" [~nr]